Cylinder Head Rebuild?

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Old 03-25-2018, 11:12 PM
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Default Cylinder Head Rebuild?

How often are you guys refreshing your LO heads? Do you typically lap the valves or replace? Grind the seats? How about spring replacement?

I'm just curious as I have a couple of seasons of sprint racing on mine... It runs great and I do not think it has lost any performance (at least what I can tell).

Thanks in advance for your thoughts/comments.
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Old 03-25-2018, 11:42 PM
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Originally Posted by adamlevine View Post
How often are you guys refreshing your LO heads? Do you typically lap the valves or replace? Grind the seats? How about spring replacement?

I'm just curious as I have a couple of seasons of sprint racing on mine... It runs great and I do not think it has lost any performance (at least what I can tell).

Thanks in advance for your thoughts/comments.



? Are you in the right forum ???

Are you talking about .21 Offroad 2 stroke motors?

They dont have cylinder heads, only Cooling heads, no valves as they are 2 stroke, and as such no valvetrain.
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Old 03-26-2018, 02:15 AM
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Some guys run 4-strones. Rarely are the heads “rebuilt” in these as a maintenance item. The valve lash gets checked a few times per season, valvetrain gets a squirt of oil every other outing, but otherwise no valve lapping or anything like that. Unless of course you do something wrong that bends a valve or something, then you’re tearing down to do some work. Maybe a bearing change...
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Old 03-28-2018, 02:25 PM
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Originally Posted by SlowLST2 View Post
Some guys run 4-strones. Rarely are the heads “rebuilt” in these as a maintenance item. The valve lash gets checked a few times per season, valvetrain gets a squirt of oil every other outing, but otherwise no valve lapping or anything like that. Unless of course you do something wrong that bends a valve or something, then you’re tearing down to do some work. Maybe a bearing change...
Show me some of these 4 strokes, other that FS in Kyoshos!

No one races a 4 stroke, he stated sprints, maybe like sprint dirt oval? If so id love to see that setup. I have raced dirt oval for a long time, and have not seens any 4stroke motors being run. Plus it would bw against the rules.

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