Does anybody really do this?

I just did a top end on my 01 yz250 and the manual recommends after the initial breakin to remove the cyclinder and check the piston for high spots and then sand them down. I have a race on saturday and really won't have the time to do it.

I've been riding 2 strokes for 25 years never done that and don't know anyone that has.Most of the time we take it cool for about 15-20 minutes then all out.

same here, run it through a few heat cycles and you should be good to go.

if you have a new cyl,crank and piston take it easy for a while.

I will admit to doing it once. It was a waste of time and I never bothered again.

Me thinks the reason in doing this is so Yamaha can sell more base gaskets. Notice how their stock goes up every time one is sold. They are proud of them.

thanks guys, I did it once too. I cant imagine it would make much difference

Never done this & never heard of it before either, can't imagine it would make any difference whatever & as said is probably just a way for Yam to bring in more money (wonder just how many owners take their bike to the stealership for 'piston sanding' complete with new head/base/reed/powervalve gaskets, coolant, sparkplug & probably gearbox oil too while they're at it?)... :D

Never done this & never heard of it before either, can't imagine it would make any difference whatever & as said is probably just a way for Yam to bring in more money (wonder just how many owners take their bike to the stealership for 'piston sanding' complete with new head/base/reed/powervalve gaskets, coolant, sparkplug & probably gearbox oil too while they're at it?)... :D

Dont forget a new powerband gasket and new muffler bearings. Those things are always shot after break in.

Kawasaki recommended the same for my KDX. Never did it on that bike either.

I will, however, remove the exhaust and reeds and take a peak in at things after the first few weekends of riding (maybe 5-8 hrs).

Kawasaki recommended the same for my KDX. Never did it on that bike either.

I will, however, remove the exhaust and reeds and take a peak in at things after the first few weekends of riding (maybe 5-8 hrs).

This is also all the further I go for top end check after rebuild.. If it runs like it did before or better, ride the thing :D

Speaking of, I just did my top end last night.. Pics soon

This is also all the further I go for top end check after rebuild.. If it runs like it did before or better, ride the thing :worthy:

Speaking of, I just did my top end last night.. Pics soon

I just finished rebuilding mine yesterday as well, top & bottom, and a WR 5th. Got the rest of the bike together today, started 2nd kick. Test ride tomorrow. :D

No pics though. I just now realized it's been literally 1 year since my digital camera died. Guess maybe I should get a new one.

how did you only change to the WR 5th gear and not 3/4/5?

Cheers

You don't need to do all three. Leaves a big jump from 4th to 5th, but that's fine with me. I mostly ride tight single track, and I just wanted a taller top gear for open sections.

xxxbranham on the forum has the same setup. I've ridden his bike, but unfortunately never on an open enough trail to get into 5th. He says if you rev it out in 4th before grabbing 5th it will pull under most conditions.

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