Hello Nice Video That was great information, I used to Race a Kawasaki 750cc 3 cylinder and I wish I had that info back in the 70's It would have saved me some trouble then. That exactly is what happened to my Bike then, It was the center cylinder (It always ran hotter than the other 2) that one had that problem, I used Weisco Forged Alum, Pistons, What I did to remedy that problem was to use an indexing tool to mark out a series of drill points all the way around the piston about .500' apart (I cant remember exactly but just do the math for the pattern) and .500 lower stagger the indexing marks to land in between the first row and continue stepping the marks all the way down on the piston, (I had a friend with a machine shop , that made it easier) When that was done I used a .250 Drill and started the first pocket but drilled only to the depth of the angle on the tip of the drill, I set the depth on the Drill Press so the rest would be the same, and followed every mark at that depth all the way to the bottom of the piston, Not only were the pistons beautiful when finished but they balanced out almost perfectly and all Cylinders ran cooler (Compression was not effected, Slight increase in RPM's And it would get to maximum RPM's faster. The end result was a lighter piston with less friction and more lubrication on the Cylinder walls with less friction, That worked well for me, Never had a problem after that, I Hope you can use this to your advantage. Oh and they really are beautiful when finished. Be Well my friend, I like your way of presenting your video , That's why I am sharing this with you, I'm old now and don't want to go to my grave without sharing my trade secrets to anyone! Hope you liked it ! Ron Nadeau
wow thanks for info. ive cracked 2 cylinders right where you showed it cracked and never have known to do this til my friend told me the other day to drill holes and then i came across this vid. i have same bike 03 cr250 and just bought new cylinder and wiesco piston and am looking forward to having a reliable machine.
Thanks man! Glad you found this vid. Lubrication holes are important. Im sure your CR250 will work well with some lubrication holes and Wiseco piston. Good luck :)
This is correct, my machine shop explains it to me so I let them do it , they know more about this than me, I haven’t had any issues and glad they did it
surely if it was such a big problem,then they will make pistons with the holes already drilled out,never been a problem with me and my bikes.thank you.
For everyone wondering, drilling theses lubrication holes will not effect your compression as the holes are drilled after the piston rings. Basically the intent is to cool down your Exhaust bridge meaning that you wont have as much wear on your piston and over all you'll have less issues in the future. Great video!
Hi Frez, do you know if I have to drill my piston in case of sleeve cylinder ? Or if it's just for Nikasil application and alloy monobloc cylinder? Thank you
G'day do you think this would work on a chainsaw piston? given that a chainsaw is flat out all the time when working hard, I have found a lot of cooked saws that this might of fixed so I will try it out. Great video out of the box for thinking cheers Kevin
MrHangerone It will only work if the cylinder has an exhaust bridge. If there isn't one already then the piston is not needed to be drilled. I hope this help?
Cast pistons does not expand that much as a forged piston and therefore they need no holes. It´s the same procedure when you building a Engine. If you use cast pistons you need very Little clearence ´between the piston and the cylinder wall. but if you use forged pistons you need much more clearence between the piston and the cylinder wall becouse forged things expand much much more when they got warm then cast ones.
Noah Kruetzkamp is it a Forged piston if so it is recommended to drill the holes for lubrication so you don’t have a premature piston failure But you don’t need to
Hello Stuntmannen1000! Im using Lucas 2-stroke oil and im mixing 2%. 2% oil equals 200ml on 10 liters of fuel. But thats just what i use. I have jetted my bike for this. Thanks :)
Im not sure but i think so. I see the CR500 guys drill 3 holes in the forged pistons. Take off the exhaust chamber and take look. I think CR500 uses the bridge design.
Arne Eide So the exhaust port can be wider. If you'd have the same port without the bridge, the piston ring would bulge to much into the exhaust port. This would increase wear alot, or worse break the pistonring if it would catch on the port.
Because the same pistons can be used on different engines. Some engines have exhaust bridges and some do not. Thats why Weiseco for example leaves the drilling to the customer. When you buy Wiseco pistons, you will get a instruction paper where they show you how to drill the holes and somethimes Wieseco pistons comes pre-drilled but that has never happened to me. I have always drilled holes in the wiseco pistons. I think Wossner comes pre-drilled too but not 100% sure. Thanks. Jan :)
All the years ive been riding cr250's ive NEVER had to drill any holes in the piston. There is no need to do this, as long as you maintain your bike properley and always warm your bike properley and use the correct oil/fuel mix you never ever need to do this.
If the directions that come with your piston says to drill holes, you should drill holes. I don't believe they would waste ink or time saying it otherwise.
Then you might only run cast or original pistons? You dont need to drill those. If you use Wiseco or aluminium pistons, its a very good idea to drill holes or you might crack the exhaust bridge in the cylinder. Then your cylinder is waste.
Soo why does not the manufacturer off pistons and maybe the whole Engine,drill this holes if there are so necesery ?? Hard to belive that it is a costthing when the only thing you need is a drillbit and a drillmachine and woluld cost a bout 20 dollar extra in workpayment to according to you save a lot of Engines from seize.
Keep the piston lubricated? Just take the spark plug off, and pour 2 stroke oil down the piston and cylinder, that also helps keep it lubricated and last longer
Yeah that could be but that is such a waste of oil mate if youre just straight pouring it in the combustion chamber its going to go straight back uit of the exhaust so it just doenst make any sense te me sorry
its such a shame that Honda shit canned their new crank case engine the 05 on is a work of art, it just did not get the dollars needed to make it better and better by year by year.
I think you should of explained in the beginning , that this only applies to forged pistons. What a waste of time listening so far in only to find out it doesn’t apply to my bike.
Im not very good at speaking english but i tried my best, lol! Hope you understand what i try to tell you :)
Frez Production Don't worry man it's awesome, can understand everything !
Frez Productions You speak English just fine. Excellent video thank you!
Frez Productions I
Thank you Joe! Great to hear =)
Thank you Backyard Boosters! Awesome :)
Hello Nice Video That was great information, I used to Race a Kawasaki 750cc 3 cylinder and I wish I had that info back in the 70's It would have saved me some trouble then. That exactly is what happened to my Bike then, It was the center cylinder (It always ran hotter than the other 2) that one had that problem, I used Weisco Forged Alum, Pistons, What I did to remedy that problem was to use an indexing tool to mark out a series of drill points all the way around the piston about .500' apart (I cant remember exactly but just do the math for the pattern) and .500 lower stagger the indexing marks to land in between the first row and continue stepping the marks all the way down on the piston, (I had a friend with a machine shop , that made it easier) When that was done I used a .250 Drill and started the first pocket but drilled only to the depth of the angle on the tip of the drill, I set the depth on the Drill Press so the rest would be the same, and followed every mark at that depth all the way to the bottom of the piston, Not only were the pistons beautiful when finished but they balanced out almost perfectly and all Cylinders ran cooler (Compression was not effected, Slight increase in RPM's And it would get to maximum RPM's faster. The end result was a lighter piston with less friction and more lubrication on the Cylinder walls with less friction, That worked well for me, Never had a problem after that, I Hope you can use this to your advantage. Oh and they really are beautiful when finished. Be Well my friend, I like your way of presenting your video , That's why I am sharing this with you, I'm old now and don't want to go to my grave without sharing my trade secrets to anyone! Hope you liked it ! Ron Nadeau
wow thanks for info. ive cracked 2 cylinders right where you showed it cracked and never have known to do this til my friend told me the other day to drill holes and then i came across this vid. i have same bike 03 cr250 and just bought new cylinder and wiesco piston and am looking forward to having a reliable machine.
Thanks man! Glad you found this vid. Lubrication holes are important. Im sure your CR250 will work well with some lubrication holes and Wiseco piston. Good luck :)
How did it work out, now that its a year later?
This is correct, my machine shop explains it to me so I let them do it , they know more about this than me, I haven’t had any issues and glad they did it
That was a smart choice :=) Good work.
Thank you so much! I have had questions about these piston holes but thatnks to this vid i now understand!
Thanks Kar Tom! Awesome to hear =)
Thank you for this video, you explained why this is necessary for cylinders with Exhaust Bridges better than Wisecos instructions 👌🏻😊
Thank you! I really appreciate your kind words and im glad the video was helpfull 😃
Du er nødt til å være Norsk du :)
Kjempe flott film du har laget her. lett å skjønne å veldig enkelt å følge med på.
Bra jobbet.
Hei :) Ja det er korrekt. Takk for kommentaren!
surely if it was such a big problem,then they will make pistons with the holes already drilled out,never been a problem with me and my bikes.thank you.
They make aluminium pistons already drilled out....Wiseco does not but they come with a instruction on how to do it yourself. Thank you..
Good info mate beautiful bike's keep them hummin
Nice info . Thanks mate nice vid too!
For everyone wondering, drilling theses lubrication holes will not effect your compression as the holes are drilled after the piston rings. Basically the intent is to cool down your Exhaust bridge meaning that you wont have as much wear on your piston and over all you'll have less issues in the future. Great video!
You are correct sir! Thanks again.
VERY GOOD VIDEO THANK U
Hi Frez, do you know if I have to drill my piston in case of sleeve cylinder ? Or if it's just for Nikasil application and alloy monobloc cylinder? Thank you
Hello, the video was excellent and helpful .
Question What is the reason for using these pistons and not others?
Should you do it on Vertex piston?
and without exhaust bridge?? can u also drill holes for those cylinders?
You should make a video on a cr125 power valve... I’d love to know how to get the thing off and on again.
Slide hammer
Nice video homie
Thanks man, glad you like it!
G'day do you think this would work on a chainsaw piston? given that a chainsaw is flat out all the time when working hard, I have found a lot of cooked saws that this might of fixed so I will try it out. Great video out of the box for thinking cheers Kevin
MrHangerone
It will only work if the cylinder has an exhaust bridge. If there isn't one already then the piston is not needed to be drilled. I hope this help?
cheers
My piston is cast and is perfectly fine with 4 drilled holes like the ones you showed.
Cast pistons does not expand that much as a forged piston and therefore they need no holes. It´s the same procedure when you building a Engine. If you use cast pistons you need very Little clearence ´between the piston and the cylinder wall. but if you use forged pistons you need much more clearence between the piston and the cylinder wall becouse forged things expand much much more when they got warm then cast ones.
Got it, just wanted to point that having a cast one with a couple holes is doable, the autor was saying otherwise.
I need a stroker Crankshaft For 99 Honda CR125R could you advice where can I get it. Thanks
Can you drill through a vertex piston. Someone pls tell me I'm rebuilding my bike soon and I dont want to make the wrong choice
Noah Kruetzkamp is it a Forged piston if so it is recommended to drill the holes for lubrication so you don’t have a premature piston failure But you don’t need to
what 2stroke oil are you using and at what %/ mixture do you blend it ?, Awesome video!
Hello Stuntmannen1000! Im using Lucas 2-stroke oil and im mixing 2%. 2% oil equals 200ml on 10 liters of fuel. But thats just what i use. I have jetted my bike for this. Thanks :)
ok; thanks
👍
what about vertex pistons
do you know if my 2001 cr500 motor has a bridged port ?
Im not sure but i think so. I see the CR500 guys drill 3 holes in the forged pistons. Take off the exhaust chamber and take look. I think CR500 uses the bridge design.
WHEN YOU DONT HAVE A BRIDGE THE HOLES CAN ALSO HELP LUBRICATION AT THE HOT EXHAUST AREA
really? i am planning to do so...
@@Cil3kes I LEARNED IT FROM THE JAWA CZ RACE TEAM MECHANIC. IT STOPPED MY SEIZURE PROBLEM..
@@AIRMANBEAR thanks bro
I've never had a problem
In the kawa kx 250 dont is need drill holes on piston my cylinder dont have exhaust bridge
Thats right!
Why do they use exhaust bridges?
Arne Eide So the exhaust port can be wider. If you'd have the same port without the bridge, the piston ring would bulge to much into the exhaust port. This would increase wear alot, or worse break the pistonring if it would catch on the port.
RyanAndroid thanks for the explanation, I was wondering the same thing.
.300"- how much is this in millimeters?
,300= 7,5mm
,375= 9,5mm
Why don't pistons just come with it
Because the same pistons can be used on different engines. Some engines have exhaust bridges and some do not. Thats why Weiseco for example leaves the drilling to the customer. When you buy Wiseco pistons, you will get a instruction paper where they show you how to drill the holes and somethimes Wieseco pistons comes pre-drilled but that has never happened to me. I have always drilled holes in the wiseco pistons. I think Wossner comes pre-drilled too but not 100% sure. Thanks. Jan :)
All the years ive been riding cr250's ive NEVER had to drill any holes in the piston. There is no need to do this, as long as you maintain your bike properley and always warm your bike properley and use the correct oil/fuel mix you never ever need to do this.
If the directions that come with your piston says to drill holes, you should drill holes. I don't believe they would waste ink or time saying it otherwise.
Then you might only run cast or original pistons? You dont need to drill those. If you use Wiseco or aluminium pistons, its a very good idea to drill holes or you might crack the exhaust bridge in the cylinder. Then your cylinder is waste.
Soo why does not the manufacturer off pistons and maybe the whole Engine,drill this holes if there are so necesery ?? Hard to belive that it is a costthing when the only thing you need is a drillbit and a drillmachine and woluld cost a bout 20 dollar extra in workpayment to according to you save a lot of Engines from seize.
i have come here to defeat you ricky bobby-
I spilled my macchiato...
good vid, but I think everyone knows this, maybe I'm wrong...
Thanks! If you look on forums, there are plenty of people who doesnt know. Many havent even heard about "lubrication holes".
I have NEVER heard of this... and i have been riding 2 strokes for most of my life
I had no idea... that’s why Im here to learn.
Keep the piston lubricated? Just take the spark plug off, and pour 2 stroke oil down the piston and cylinder, that also helps keep it lubricated and last longer
i think that youre bike wil run great if you do that !
Merlin Daley it won't run right at first but bleep it while it warms up and start off slow, it comes out of it and runs great
Yeah that could be but that is such a waste of oil mate if youre just straight pouring it in the combustion chamber its going to go straight back uit of the exhaust so it just doenst make any sense te me sorry
Merlin Daley that's very true but just don't do it all the time maybe like once or twice a month or once or twice a year
Joz Sports that make sense 👌
its such a shame that Honda shit canned their new crank case engine the 05 on is a work of art, it just did not get the dollars needed to make it better and better by year by year.
you have got a 02-04 cylinder as well, you must like the Honda.
and a cr500 cylinder to, " the honda man"
I think you should of explained in the beginning , that this only applies to forged pistons. What a waste of time listening so far in only to find out it doesn’t apply to my bike.