Pretty in Pink, dunno why
Join Date: Feb 2009
Location: Redondo Beach
Nothing so concise, I fear.
Some do it for the modest gain in horsepower and torque, others do it to give life to an old, tired, engine. It's a solid cure for oil burning issues.
I think the best reason is the second reason, as its $/hp ratio isn't spectacular.
There are quite a few options. The 685 is a tried-and-true set-up, but big bore kits and motorcycles go back to before dirt was new. There is no magic or mystery to it. There are pistons and ring sets available from JR, Arias, Wössner and others in +.5, +1, +1.5, +2mm configurations. Any of those, and a post '96 cylinder, can be taken to an average automotive machine shop to get the bore and hone done, then brought home and assembled with little trouble.
There is a larger overbore, the 705, that requires a special cylinder because the over-bore is quite large. Its $/hp ratio is even less spectacular.
If your engine is burning oil, consider that $500 buys a lot of oil if you are capable of keeping an eye on the oil level.
Tom [email protected]
“If I wasn't hard, I wouldn't be alive. If I couldn't ever be gentle, I wouldn't deserve to be alive.”
'How' are words so important they cannot be too often used.”
Sting like a butterfly.