Spent a lot of time building racing k4 engines as a lad and there are some very nice touches on this one. I still have a 250 engine I built as a one off with hand made high comp pistons and gas flowed head that would rev to 16k till the valves started bouncing. Nice work.
We tried several types of cam chain tensioners on cb 350. Among other, the KA tensioner. They all had in common that they wear out quickly on the race track. This was an attempt to solve the problem in a reasonable way, nor this solution is no better.
It looks like you made sleeve adapters to press into the center of a couple of unsealed roller bearings to use in place of the cam chain rollers? what O.D. are the 2 bearings you used? I may do the exact same thing as I cannot find any aftermarket rollers at a reasonable price.
Hi! Do you use the original bearings at the center and extremities of the crankshaft? Can you send a schematic diagram of the modified oil system if I send an email address? ps. Really nice work, great honda!
Hi there.. restoring a 1968 250 here in Australia that I will be converting to a 350. Would you know if the webcams grind 358a would be okay in a warm street motor : www.webcamshafts.com/pages_vehicles/motorcycle/honda/340.html ? or should I go with a smaller grind. I will be running VM 30 carbs and a boyer electronic ignition with 1mm oversize exhaust and intake valves and some porting as well as 10.5 : 1 pistons.
Sorry, we have no experience with Web Cam. A guy in Sweden is doing our cams. A few years ago we used Megacycle cams, they gave a lot of power at high rew. Hope you find something that suits you.
Oh ok... what front brake are you using? I've got a cb360 disc on mine, but it looks like you've got a twin piston brake on yours.. I was thinking of trying to adapt a 1982 cb350 nighthawk twin piston brake setup, but I'm sure a different caliper mount would need to be made..
Spent a lot of time building racing k4 engines as a lad and there are some very nice touches on this one. I still have a 250 engine I built as a one off with hand made high comp pistons and gas flowed head that would rev to 16k till the valves started bouncing. Nice work.
Mark O' Sparko hi dear
я получил удовольствие, посмотрев просто видео о сборке! молодец дядька
my homie with the yellow crocks
It would be interesting to convert one of these motorcycles to fuel injection.
Made me want to jump up and install a spring loaded chain tension.. I seen that chain flopping around..
We've tried several solutions, this is the only one that is reliable for racing.
Where did you get the tubing for the carb mounts? ingenious setup btw.. I would have never thought of that :)
Carb mounts tubing are made by our friend in Sweden. Sorry but do not think he's doing tink outside Scandinavia.
Awesome video. What kind of performance upgrades can you expect from a job like this?
Rise from 30hk on dyno to about 43 - 45
@@linus2910 you mean hp* right? lol
@@Sochmo18 right, sorry
did you buy the 5th gear close ratio cog from moto cappellini? It's over $300US , but I want to see if it were worth it or not..
Try: Moore Performance Engeenering
Why the bearing cam chain tensioner and not a KA chain tensioner? I’m just curious as to how the bearings center the chain?
We tried several types of cam chain tensioners on cb 350. Among other, the KA tensioner. They all had in common that they wear out quickly on the race track. This was an attempt to solve the problem in a reasonable way, nor this solution is no better.
It looks like you made sleeve adapters to press into the center of a couple of unsealed roller bearings to use in place of the cam chain rollers? what O.D. are the 2 bearings you used? I may do the exact same thing as I cannot find any aftermarket rollers at a reasonable price.
Sorry, i don't remember the dimensions for the bearings. However I don't recommend this configuration for street use, make too much noise.
linus i am looking at a setup on ebay that has solid steel rollers machined to be identical to the factory rubber ones. same price as factory NOS
My experience original rubber rollers do not survive high rew. Solid steel rolls could be better, but the chain should be replaced.
Hi! Do you use the original bearings at the center and extremities of the crankshaft?
Can you send a schematic diagram of the modified oil system if I send an email address?
ps. Really nice work, great honda!
Yes, original stock is used, it is rock solid. Sorry, I have no schematic diagram of the lubrication, but it is simple as you see in the video.
Wut you use for spark
I see in this video you are using R40 racing oil. No problems with the wet clutch?
No, but oil must be changed frequently.
@@linus2910 ok thank you!
I'm having same bike !! We race
What is that ignition set up?
Engine i running on Ignitech TCIP4 inductive ignition. 38 degrees advance.
www.ignitech.cz/en/vyrobky/tcip/tcip.htm
Why not build a 360 6sp vs the 350?
What caliper are you using? Thats on a 360 / 350G fork right?
www.apracing.com/products/motorcycle/brake_calipers/solo_and_classic_machines_plus_sidecar_2_piston_caliper.aspx
Yamaha fork, note adapter.
How much did this build cost with labor, just curious?
Hehe, did everything myself. Spent way too much money on parts.
how does the ignition timing work?>
Engine running on Ignitech TCIP4 inductive ignition. 38 degrees advance.
www.ignitech.cz/en/vyrobky/tcip/tcip.htm
Hi there.. restoring a 1968 250 here in Australia that I will be converting to a 350. Would you know if the webcams grind 358a would be okay in a warm street motor : www.webcamshafts.com/pages_vehicles/motorcycle/honda/340.html ? or should I go with a smaller grind. I will be running VM 30 carbs and a boyer electronic ignition with 1mm oversize exhaust and intake valves and some porting as well as 10.5 : 1 pistons.
Sorry, we have no experience with Web Cam. A guy in Sweden is doing our cams. A few years ago we used Megacycle cams, they gave a lot of power at high rew. Hope you find something that suits you.
Oh ok... what front brake are you using? I've got a cb360 disc on mine, but it looks like you've got a twin piston brake on yours.. I was thinking of trying to adapt a 1982 cb350 nighthawk twin piston brake setup, but I'm sure a different caliper mount would need to be made..
I'll check it out
www.apracing.com/products/motorcycle/brake_calipers/solo_and_classic_machines_plus_sidecar_2_piston_caliper.aspx
What pistons?
Modified kawasaki pistons
Are these Kawasaki Pistons with 66mm diameter or 69mm?
@@andyman7344 66mm diameter
@@linus2910 ok thanks! How many compression ratio is possible with this pistons? More than original?
9.5: 1 Important clearance between the piston and the cylinder head must be at least 1 mm.
2:38 why??
Due to the high pressure this engine has a copper head gasket. Copper gasket becomes rigid when used . The heating is to make it soft again.
ahaa learned something New again
Annealing Learned that from Triumph workshop manual long ago