Honda CB350 Race Engine Build- 48HP
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- čas přidán 7. 09. 2024
- Sharing my build of a 1970 Honda CB350K full race engine. Techniques shown include engine assembly, piston measurement, valve spring setup, cam timing, dyno test and more.
This is not a full tutorial on everything involved with an engine build. It does not show porting, valve seat installation, oil cooler setup, larger cylinder studs, or special valve seats.
Motorcycles are dangerous.
It is the responsibility of the mechanic to build a safe engine. A blown up engine or oil leaked on a tire can cause a crash that may seriously injure the rider. This video is backed up with decades of professional motorcycle mechanic experience. This is not a how-to video for a novice.
i know its difficult to work and record at the same time, thank you for the efforts, I have watched a full video and loved every second of it
Actually, I filmed each segment three times, to get a good assembly to view. Thanks for watching!
@@stanlipert8513 impressive 🫡
@@stanlipert8513 I watched this one and the RD400 today. Love them both.
That's amazing I wish I had 10% of your skills
I run an after school bike building program in the Milwaukee, WI area. This coming year we are going to be building a turbo CB350 land speed racer. This video is going to make life so much easier when it comes time to put the engine together. Thank you.
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Thank you so much for the time put into this I’m going to be copying your oil cooler design
Amigo, se merece todos los elogios, x su buena dedicación, al trabajo exacto requerido, y la confianza en usted de sus clientes debe ser unica. Felicitaciones. José Campos, Yaracuy - Venezuela.
You are most welcome.
Excellent work
350 cc 48 Hp jst awasom
This is next level engine building, iv never seen anyone so particular in his work, totally blew my mind 🤯
Absolutely phenomenal work! Not only the engine build but the video production also. Thank you so much for sharing this. It’s been many years since I rebuilt my stock CB350 motor so this was a nice refresher. I also learned some new tricks. It really does take a lot of attention to detail to get 48hp but your hard work is handsomely rewarded. That micro serdi valve seat cutter was neat. I’m not sure I’m willing to invest the time or money to get another 50% more out of my motor but if I ever do I’ll be studying this video over and over again.
Lllllll
My
If you reduce the radius on the rocker arm skid you can get a few more degrees of overlap for nothing. I used to race one in the mid 70's Yoshi cam, ported high comp pistons 36mm MK2 Amals. Held the NZ quarter record in 76. Great wee bike.
saludos desde Colombia, lo que hace es arte!!!
Many thanks for sharing this, I race a CB175 here in the UK but using CB200 crank and pistons. I have learned a lot from your video and will try to impliment some of your head assembly techniques. I use all standard parts except for a cam regrind and skimmed head, so far obtain 21bhp at 11000rpm but on your scale some 27hp should be obtainable, so have a bit of work to do!
Terry, exactly specific output is 132HPliter as a 362cc engine.
26-27 HP from 200cc is an excellent goal to achieve. Your 21HP is race-worthy at 105HPliter.
Be sure to measure the clearances in the same way, piston to valve, squish clearance, and valve spring pressures.
Absolutely loved that video.This man is the definition of a perfectionist.Stunning work Stan Fabulous.
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Memories of thumbing through the Clymer manual for my CB350 back in the early 80's. There was a section on what modifications could be made for more power, but it didn't try to encourage the reader, saying that it would be difficult to make the bike competitive. I'm guessing things have moved on since then!
When the CB350 twin came out, Honda built and tuned a few full race bikes, and sold the race parts as well. These bikes have a true racing pedigree from the start. Search for "CYB350".
@@stanlipert8513 k0kk9kkjk0kjj0kkk9k
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@@stanlipert8513 m m bakbak mm n mm mm mm mm mm mm v m m mm mm mm mm bk n m mm b n BVN cm m mm bk nmr n b n v b B BVN cm n M M B M N N mm mm mm cm bk nmbnnmbvmbnmbnmbvnmvnbmbnmbbmbnmbmbnmbnmnbbnbmvnmbmbbbnnbmvmbnmbnmbmbnmvnmbbmbnbmbbnnmbbmvnmvmbnvvnbnmnbmnbnmnbnbnmbbnbnmbnmbnmnmbmbmnvnbnmbnmbnbmnmbnmbnmbbmvnmnvnbmnmbnmbnmbnbmbnbmvnbmbmbnmbnbmnmbnbnmbnnmbmbnmbvbmvnmbnnbbmbnmbmvnmbmbmvbmbnbbmvnmvnmnvnmnmvmbnmvmvmvnbvmvnmbnbnbmbnbbbmbmbmvmbnmvnmbnmvnmbnbmbmvbnnmbnmbbnmbnmbnbmnmbnvnmvnbmnmvmvbnbmnnbmvnbmnmbbmvnbmnbmnnmvnmbnvmbbmnmbnmnvnvmnmnvnmvbbnbnbnbnmnbnbmbmbnbnbnmvmvnbmnbmbvnvmnmbnbnnbmbnbmbnmbnnbnmnbmbnmbmbmbnmbvnbbmbbnbnmbnmbmbmbbnmbmbnmbbmbnmvbnmbnmvmvnbmnmvmvbnmbnvmnmbnmbbbmnmvnbnmbvnmbmbnbmbnmbvnmbnvmnbbmnmbmbnbmnbmbmbmvnmbmvmbnmbmbmbnbmbnnbnmbnmnbmnbmbnmvnmbmbnmbnmbnbnmbmvnmbmvmbnbmbnbmnnbmbmbmbvmbbmbmbnmnbnbmvvnbnmbbnbmbnmbnbbnmbnmbbmnmbnvmnmbmvbmbmbbnbbmnbmvnmbmnmbmvbmnvmbmbmbbnvmbnbmnmnmvnvmnmbnmvmbbnmbnmbnmnbnmbnmbnbmbmvmbmvmbmbmbnmbbnmbmbnmbbnbnmbmvnmvbmbmbnmbnbmbmnvmbmnbmbbmbbnmbbnmbnmbnbnmbnbmnmnvmbmvmvbmbmvmbnmvvnmbvmbvnbmnvmbmnbmbnmbmbmbnmm:nmnbnmbvnbnbmnmbnbmbnmbnbmbbnmbmbmbmvmvmvmbmbnbnmbnbmbnmbbnmbmbnmbvbmnbbnnmbvmbbnnmnbmmbbmbmbmbnbnmbnbnmbnbmnbnmbbbnbnmbnmbmbmbnmbbbnmbmbnbnmbbmbnmbmbmmbnbmnmbbnmnmbnbmbmbnbmnbmnbnmbvbnbmbnmbmbnmnvbnmbnmbmbnbbnbmnmvnmbmbmbnmbmbbmbnmbnbmnbbnmbmbnmbnbnmbnbmnbnbmnmvmbnmbmbnmvnbmbnmbbmbnbmnmbmnvnbbmnmbbmbmvmbbbbbmvmbbmbnmmbbnbmbmbnmbmmbnbmbbmbnmnbnmnmnbmbmbnbmnmbbmnbbmbmnbmnmbnmbbnbmnmbnmbnmbmbmvbbbmbbnmbmbmbmbmbnmbmbmbnmbbnvnbmbmbnmbmbmbnmbnmmbmbnmbbbbnmbbbbnmbmbnmbmbnmbmbnmbnmnbnmbnmvbnbmvmbmbnmbnbbnmbbmbbmbbnmbmbnmbnnbmbmmbnbmbbnmbmbmbmbnmbmbnbmnmnbmbbmbnmbnmmbmbnmnbbnbmnmbmbmvmbbbnbnmbnbmmnbnbnmnbnmnbnbmbmbnmbnmnbnmnbbbmbmbmbbmnmbmbbmvbbmbbmbmbbmnmbnbnmbnmbnmvnmmbnmbmbmbnmnmbmbmbmbmbbnbmnmbmbnmbnmnbbnnmmbnmbmbnmbnbmnmbnmbnbmnbmbnbmbbmbnbmbmbbnbmbvbmbnnbmnbbbmbbmvmbnmbmbmbnmbnmbmbnbnmbbnmbmbbnmbmbmbbvnmbbnbbnmbmvnbnmbnmbbmnnbmbnmbnmbnmbmbmnmbmbmvmbmbnmbmbmbmbnmbnbbnnmbbnnbnbnmbmnbmbnbmnmbmbnmbnmbnmbmbmnnmbnbbbnbnmbnmbmbnbmnmbnmbmbnnmnbmnbnmbnbnmbmbnmbmbnbmnmbbnmbnbmnmbnmbnbbnmbmbbnbmbbnbmvmbvmbmbmbmbmbnmbmbmmbnmmbnmbmbmbnmbmbmbbbmbbmbnmbmbmbmnbbvbbnmbmbnmbmbnbnmbnmbmbmbbbnbnmbnbmbnbmbmmnvmnmmbnbnmbmnmbmbmbbmbmbbnmbmbmbnbmbnmbbnnbmbmbmbnbmmbnmbnnbmbmnnmbmnmbbmbmnmnbnmbbmbnbmnmbbnmmbnmbmmbmbnmbbbbnmnbvbnbmnbmnmbbmbmbmbmmbmnbnmbmbmbmbbnbmmbmbnmbmbmbmbmvmnbmnbmbnmbmbnmbmbnmbmmbbnmbbvnbmbbnmbmmbmmbnmnbmnvnmbmnbmnbmbnmbnbmbnmbmnbbmbnbnnmvnbmbmbmnnbbnmbmbbnmbmbbnbmbmbnmbmbnmbmbmbmbmmbbnmbmbbbmbbnmbnmmbbbmbmbmmbmvnmbbbnmbmvvbnmbbmbbbnbnmbnmbmbbmmnbnmnmmbnmmbmmnvmmbmvmnbnmbmnbmbmmbmmnbbmmnmbnbbbnmbbmbnbmbmbbbnnmmbmbnbnbmbmbbbmmnbmnbnbmbbmbmmbbnmbnmmmb
Would you be willing to tell me who makes the oil seal and oil seal housing that you're installing at the 15 minute mark? I'd really appreciate it. Thanks
I made my own seal holder.
Beautiful work there. The build, camera work, and captions are documentary quality! That is a great looking CB race bike.
Worked on the early Desmo Ducati's . Used to set at nil to 00.001 but had to install very week springs to ensure valve was closed when engine stopped, otherwise no compression to start. Once running inertia and compression did the rest. Early days of course, races started with dead engines , not like now with electronic anti wheelies, no rider controls. . Four valve heads too.
Valve stretch, Steel valves versus head expansion rates had us thinking at times too. Great to see an expert at work, never did one of those motors really, road versions only. But lots of work on the CB77 versions. As quick as most Big British twins when set up correctly. Did more work on two strokes latterly, fun machines !.
Many of these assembly and measurement techniques can be used on the CB77 CB450 and CB750's.
good job
Random question for Stan or any other cb350 aficionado, where are you guys getting replacement cam chain roller assemblies (the metal arm and smaller chain roller). You can find the larger roller for cheap easily on sites like 4into1 but that smaller roller is basically impossible to find. I also couldn't find any KA slippers or the Norda-bike replacements that are apparently the bee's knees in the forums. I ended up ordering a roller assembly for a cb750 because I believe they use the same roller and am going to make it work on my 350.
Todd Henning Racing usually has the KA slipper tensioners in stock. Otherwise there is an ebay seller offering all metal replacement rollers but I cannot offer anything as to the quality since I have not used them myself.
Amazing video, definitely beyond the scope of my build but I will definitely come back and watch this again during reassembly for my rebuild.
what valves did you use?
Holy crap Stan, you the man. Thank you so much. I can't wait to start building my engine again. I have a few questions. Type of pistons you used, what sealant did you use for the case halves, stock clutch plates, and closed 5th gear? I'll ask more about what valves did you use later.
The pistons ate Todd Henning Racing, sealant is Permatex Ultra Grey, stock clutch plates and the close ratio 5th gear is available from a couple sources, just Google!
@@stanlipert8513
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Thanks for the reply on the crank. I will look for the episode but I doubt I will convince my machinist to invest 6 hours. I'm going to buy a couple and disassemble and put it back together and put on my test motor to see what happen. I will share the results. I have one question about the studs. The CB450 studs are a couple mm ticker than the CB350 studs. Did you bored out the passages?
Yes, the through holes are drilled to 10mm and the dowel counterbores are larder for the larger dowels.
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Spirit hopefully you are always healthy😊
You measured the intake piston to valve clearance at 0.056. Did you measure the exhaust piston to valve clearance?What would you recommend for exhaust piston to valve clearance?
Piston to valve minimum clearance of .08" for my builds.
In standard form these were gutless but reliable
this is the best video I've ever seen on this topic. Thank you for doing this, I am building my 350 right now and this video will help me immensely!
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@@rozak015 to free
FANTASTIC JOB. Thank you !!!
Hey Stan!
Looks like you might have done this once or twice before 😂🎶🦐
"I'm gonna race my 350. I have tons of money but no riding ability. I want the best engine money can buy damnit!!!" Said the owner of this engine.
This is my personal engine, all of the work is my own, I did all of the development work. Just sharing for those who want to know what it takes to build at a high level.
I still hold the lap record at my home track Mid-Ohio for this class of race bike @1:48:9. I can ride as well.
Stan im taking your side man
@@vishalrao9263 Oh, no need to take sides, its his engine and he IS a good rider, my misunderstanding - I thought this was being built for a customer. Stan is a legit genius and an excellent machinist/fab/engine builder and rider!!!!
I want to know what pistons and cam you are using and where to get them
Nice build! I am thinking about buying a Serdi Micro. Do you recomend i?
Honestly it depends on your equipment. If you have a vertical knee mill there are other option. Check out the Goodson catalog.
Hi Stan!
I really like this video. Professional work.
My question would be, how do you disassemble the honda cb crankshaft? Don't have some photos or videos of it? It's not a simple structure.
Or is it already a completely custom-made crankshaft? I can see the relief in it.
Is it possible to buy a new connecting rod kit?
The crank can be taken apart and rebuilt not an easy job. These cranks have shallow splines on the pins and require exact alignment to assemble.
@@stanlipert8513,***
Why not use a ring compressor or a hose clamp to get the pistons in the cylinder ?
Ring compressors don't work well at a risk of damaging the rings.
Hai Stan, I am Justin from India, I own a 1971 CB350 B3 Japan, this bike was a private import and now needs a new camshaft and valves to make it run again. any idea from where I can source custom parts for my CB as K Series CB's are different from B3 I cannot use the K series parts for my bike. we have the same bikes RD 350 and CB350 Twin 😊
What are the diameters of your intake and exhaust valves? What is the diameter of the valve stems? What cam are you running? Thanks for doing this. Just Excellent
Exhaust are stock size, could be smaller. Intake are an enormous 35.5mm, requiring sunken valve seats to achieve valve to valve clearance on overlap, plus X5 cam, as first designed by Todd Henning, as the "big valve" cam. Valve stems are stock, robust 7mm. They can take some valve to valve hits without breaking off the heads. Ask me how I know this!
Did you start with a 36 mm intake valve and cut it down on the lathe to 35.5 mm to achieve the 0.030” valve to valve clearance. I have one head that I was running the 36 mm intake valves(7.0mm) for a season. One of the valves broke off at the valve stem. I rechecked the unbroken clearance on the remaining valves and found it to be 0.020” Do you think the valve to valve clearance changes over time? I’m not sure what the clearance was originally on that head. What’s the story on your 7mm valve stems? Was there evidence of a collision?
What’s your opinion on the Kibblewhite’s 5.0 mm valve conversion system versus their stock 7.0 mm valve kit
Thanks again for sharing your knowledge on these engines
@@kendebelak3073 Yes, 36 cut down to size, plus beveled margin to achieve valve to valve clearance. The valves will clash is there is any valve float.
Okey i found
@@stanlipert8513 ppp
also what are those added on hose fittings on the primary cover?
Oil is routed to an oil cooler.
Who did your crank lightening and balance? I have been looking for a machine shop to do mine and couldn't find one. APE and other usual suspects will not do it. I may take to a friend machinist in Cummings and work with him but I rather get somebody who did one or a few before. I'm in ATL.
I do my own machining. Basically I prefer to keep the crank together, strap the rods to the wall behind the lathe and take small cuts in backgear (slow RPM). I demonstrated this in Season 3 Cafe Racer TV show. Be for warned, with the interrupted cuts and slow speed, my first crank took 6 hours on a Southbend.
Hay quá em ơi ❤️👍
Thanks!!!!!
Muito bom parabéns 🇧🇷
Stan!! How's it going man?! Sharing secrets 20 years after the fact, huh? Are you still racing? I remember you also built very competitive RDs.
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Please 🥺🥺
@@satyaprakashsatendrasathap1547 an
Dami sir
Since you have such large intake valves , 35.5 mm, did you did you increase the intake port diameter over the stock port diameter (I Think its 30 mm) as a result of porting the head? If so, what diameter. Is there a taper as you move down the intake port
Ken, I keep the ports as small as possible for high velocity, until just before the valve seat it flares out. The port roof is raised in a pocket before the valve seat to flow better around the roof.
hi I have honda cb hness 350 in India can u help me to install oil cooler in it
Your H'ness is 2020 year. The CB350K is from the 1960's. No relation, sorry no.
@@stanlipert8513 ok, i really appreciate your reply👍👍
belleza
Thanks for all your information .
Amazing... Love it's
can you make a parts list? or do you know who i can send a cb400 engine too to have this kind of work done?
Check out
www.thrhonda.com/THR/CB350_K4.html
and ebay store @
www.ebay.com/str/toddhenningracing
Are you racing a CB400F or CB400T/N?
Hey Stan, love the meticulous. Thank you for sharing. Do you have double clutch cable setup? can you explain that when you have a moment?
Double clutch cable? Stock clutch cable and plates, with race springs work well.
Stan Lipert nevermind I just got confused with the throttle cables. 👍
Hay Stan. It's Joe Reisinger. How you making out? Still building CB 350's. I got a stock ( clean) set of carbs in the garage if you need them LOL.
What's the engine displacement?
Actual is 362CC, compliant with the racing clubs.
Is this an Elmer fud channel
Where did you get that left side oil seal?
The seal is a standard metric seal running on the crank, the aluminum holder is custom machined.
Stan is this a standard head gasket? I will install 66mm Wisecos in my engine and i don´t know about the head gasket...
I prefer to use the stock composite type of head gasket. You may use the 68mm head gasket from Cometec, this is what I use. Available from Andrew's Motorsports. Good for your 66mm pistons as well.
www.ebay.com/itm/Cometic-Head-Gasket-Honda-CB350-1968-1971-68-00mm-Bore-H0406043F-AHRMA/183901285019?hash=item2ad15eea9b:g:y~wAAOSwBHJdPL6J
@@stanlipert8513 thanks a lot!
مومتاز۔👏👏👏👏👏✌👆
Iam satisfied sir thank you.make a video Honda CB 175 engine rebuilding.
Stan which carbs are you using on this engine?
Keihin CR31 smoothbores. Die cast from the 70s.
Pretty sure that's the first time I've seen anyone degreeing a cam using opposite rotation to normal running?
Are ARP making 10mm studs now or did you use XS650 ones?
PJ, Cam openings and closings goes both forward and backwards rotation, less travel on the dial indicator tends to have better accuracy and easier indicator setup, plus less valve spring pressure to deal with.
My 10mm studs are CB450 inner. Never had one break, after breaking many stock studs.
@@stanlipert8513 Hi Stan, I didn't know CB450 studs fitted, only ever been asked about XS650 as I have a couple of XS's. Even with a new chain, isn't there some backlash, particularly as tensioner wasn't fitted? I guess the dyno run proves everything was OK though, that's good output and shows what a good cam can do compared to the stock Honda one.
@@1crazypj No camchain slack or backlash when timing the cam. Camchain installed, head tightened down, tensioner installed.
@@stanlipert8513 Ah, didn't see tensioner install on check, only final build.
AWESOME!!!!
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@@armimawkon2605 . please
how did you get it that clean? Even the wind plate is shiney!! Id love to geat my gears to shine like that, mine are red.
The cases are bead blasted. Transmission parts may be burnished with a wire wheel.
Siap nggo balapan celeng
Yes it is!!!
hard system!
What break-in procedure did you follow before testing on the dyno? Any recommendations for oil?
Bring the engine up to temperature. The heads and cylinders first with fan on, then several easy runs to get heat into the crankcases.
I always use a 20/50 full synthetic motorcycle oil for any air cooled engine, the operating temperature will be 275--320F at the spark plug base. (water cooled engine temperature will be 220F, so I use 10/40.)
In the US, the best bang for the buck oil is Mobile 1 20/50 V Twin oil, $10.00 at Wal-Mart.
I always use mineral oil . 2 to 3 heat cycles and 2 to 3 light runs at the track
Wow! Do you build these for customers? I want one!
I had built bikes and engines for customers for 30 years, but no more.
@@stanlipert8513 I have a 74 CB350F. Would you be willing to build the motor? If not, any recommendations for someone who can build the motor with reliable power? I live in Georgia, north of Atlanta but I can always ship the motor.
Hey Stan I had a question brother, what was the top speed reach on the dyno pull of yours? I am extremely curious of how fast you can go with 48.2 horsepower on such an awesome light bike...
Bike speed on the dyno is zero MPH, top speed on the race track is north of 115MPH, but I have no speedometer.
What the valve size?
Please see comments below.
Okey i found
Woah... I just realised it doesnt use regular oil filter
Yes, stock centrifugal oil filter.
Hello Stan, I wanted to ask you are you in California by chance? I would absolutely love to get my CB 350 rebuilt like you have rebuild yours, do you do work for any other person that's interested in a motor rebuild? I would be more than happy to pay you to rebuild my motor, please let me know if you would be interested.
Joe, sorry, I only work on my own bikes now.
@@stanlipert8513 damn what a bummer brother! I wouldn't be more than happy to pay you whatever you're asking price is, I just want my cb350 motor to be able to do more than just 95/100 MPH, and with the only 32 horsepower from the factory you're not going to get that, I would kill to have that engine of yours in my frame, well if you change your mind brother I'm just a quick message away, absolutely awesome, unbelievable work you did to that motor, man what I would do for that motor!!! By the way have you gotten at top speed run on her yet?
motor ficou zero dahora 😉
Thank you very much!
What is the piston stroke length with a diameter of 67.5 mm?
The crank has the stock stroke of 50.6mm.
@@stanlipert8513 Then the engine cubic capacity is 362.141 mm?
ftrオイル交換
i'm good
TV
Mm...
speed 2x is good 🤣🤣
No shit! Damn! What is the maximum RPM for this engine? we're just marmons so we don't know that, sorry 🤣😊
The RPM is the bottom scale in the dyno chart.
Koko
😘
Be very very quiet I'm rebuilding engine
Lp
Sumer
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amateur!
Mm...