TheRealFatShady
10-09-2010, 12:00 AM
This is going to sound nuts...I know.
I need a 250x (87-92) piston. I looked online, then checked eBay for awhile. The only pistons that are over the stock (74mm) size are 12:1. Even the stock ones looked like mostly Wiseco 12:1 kits on eBay.
I CANNOT find one that is maybe 11:1, or 10.25:1. Maybe I can get one if I call some places, but I've never heard of only seeing high comp. pistons commonly available. I thought only full one racing machines ran 12:1 - I want to use pump gas.
Is it OK to run this with a mostly stock bike? I mean stock valve springs, cam, non hard faced rockers. I do have a cobra exhaust + aftermarket header, and maybe jet kit and air filter.
I've also searched, and at least 2 other people on this site claim it works fine their bike. but recommend exhaust + jet kit. One bike stock, one has a cam, carb, exhaust, etc. No valve work.
http://www.hondaatvforums.net/forums/performance-modifications/4091-87-250x-12-1-piston-all-else-stock.html
Thoughts?
EDIT - I guess I can use a 300ex piston kit, it's interchangeable but lower compressing rating. Apparently the 250x engine runs better than the EX, so peope often use the 250 pistons in the 300. Most are 11:1. That should be better?
If Namura pistons work well, I can get that + gaskets for around $100 shipped! Lots cheaper than the 12:1 250x pistons. Even wiseco's are about $40 less for the 300.
I need a 250x (87-92) piston. I looked online, then checked eBay for awhile. The only pistons that are over the stock (74mm) size are 12:1. Even the stock ones looked like mostly Wiseco 12:1 kits on eBay.
I CANNOT find one that is maybe 11:1, or 10.25:1. Maybe I can get one if I call some places, but I've never heard of only seeing high comp. pistons commonly available. I thought only full one racing machines ran 12:1 - I want to use pump gas.
Is it OK to run this with a mostly stock bike? I mean stock valve springs, cam, non hard faced rockers. I do have a cobra exhaust + aftermarket header, and maybe jet kit and air filter.
I've also searched, and at least 2 other people on this site claim it works fine their bike. but recommend exhaust + jet kit. One bike stock, one has a cam, carb, exhaust, etc. No valve work.
http://www.hondaatvforums.net/forums/performance-modifications/4091-87-250x-12-1-piston-all-else-stock.html
Thoughts?
EDIT - I guess I can use a 300ex piston kit, it's interchangeable but lower compressing rating. Apparently the 250x engine runs better than the EX, so peope often use the 250 pistons in the 300. Most are 11:1. That should be better?
If Namura pistons work well, I can get that + gaskets for around $100 shipped! Lots cheaper than the 12:1 250x pistons. Even wiseco's are about $40 less for the 300.