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Posted by: teeweewuver
I just bought a 1981 ATC 250r. Previous owner melted the piston, I took it in to have it fix and found the sleeve is for a 75mm piston.
Biggest Wisco I found is 72mm. NE1 know of a big bore kit that would use a 75mm piston?
Posted by: teeweewuver
Would it be possible to re-sleeve it back to stock? I totally would if possible, where would I look for that?
Thanx for your help too!
Posted by: teeweewuver
Took the cylinder to another machine shop today to see if I could get some more help. Turned out the dink at the first shop measured wrong. Its only a 71mm piston. Kinda bummed I dont have a big bore, but getting my $50 250r running looks a whole lot easier. Thanx for the help!
Posted by: HMFIC
I don't know of any off hand for the older R's. If it was me I would have it resleeved though. I don't know how good an that air cooled engine would do with that big of a piston. I am sure it would run but I just don't know for how long running with higher temps. All you have to do is look at the piston that is in it and you will see how the story will end.
Posted by: HMFIC
Contact L.A. Sleeve. They should be able to hook you up.
Posted by: Troll
Sounds like it has a 300cc kit? I'm in the same boat.
There are no 300cc pistons avalible. I know a place that has one, but there $220.
The honda 300cc kit has a seven stud head instead of six. Then the fins on the cyl and head are huge.
heres a poor pic of one. You can see how the head is different than a stock 250.300cc pic
Posted by: Troll
You might call this place in Milwaukie, OR
link
