HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
mike_dean

Piston, when?

5 posts in this topic

When would you replace your piston as regular maintenance? '00 426, over 200 hrs, engine has never been apart, runs great. thanks mike

Share this post


Link to post
Share on other sites

Intresting question

I was just going over the Maint Schedual per the Yami Manual.

If I remember from last night I think it said

every 3rd race or 500 or 1000k to inspect / replace if needed.

So this brings up agood point.

Who follows the recommended Maint schedual / chk as perscribed by the manual.

Opps dang fat finger hit return to quick

I would say if it aint broke dont fix it. If compression is well in the standard and no smoke is seen, then why ?

But then again, I am a tinkerer and plan on an engine tear down this Winter.

Why a engine tear down, Check trannie, clutch, oil pump, crank piston and valves to specification.

Who knows I may just bore it to a 440 :)

[ July 25, 2002: Message edited by: E.G.O.**** ]

Share this post


Link to post
Share on other sites

I just had my top end done on my 01 with about 150hrs. I noticed a decrease in power & that is why I did it.

Share this post


Link to post
Share on other sites

I rebuilt mine the first time at about 150 hours. It didn't need it. If I had it to do over again I would have waited until the compression didn't spec. One thing I found out is that the cylicer at 12.5:1 compression is much more critical than on a 2 stroke. If your new piston isn't just right you will have problems and have to either have it replated to match your piston, or go with the pricey stock piston. A good compromise would be to do a new set of rings if your compression is okay.

Share this post


Link to post
Share on other sites

Pistons can get fatigued. If you have been racing it hard, you might want to do a piston. I doubt the bore would need work. Basically what Id call a "top end refresh". Id be more worried about the valve springs. They are much more likley to fail.

Its surprizing how much new valve springs will improve a motors manners. When I was racing super stock flatbottoms, we'd change the springs twice a season. And after the races we'd pull the push rods, so we wouldnt have one or two hangnig open, sacking out the spring. Just food for thought.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0