Sponsored Links (Register now to hide all advertisements)
Valves can also stick from using this corn crap gas, and from being assembled with too little stem clearance. About 15 years ago my 1939 motorbike stuck an exhaust valve. I had accidentally put some old crap gas (10% corn crap) in the gas tank, then rode the bike about 5 miles. A day or two later I went to start the engine, and it had no compression. I pulled the head and found the exhaust valve stuck open, and it was stuck so hard that I had to spray the stem with Kroil and use a hammer and punch to knock it down. I'd then turn the engine over and have to repeat this. It took about 10 times of repeating this before it was operating correctly. That crap gas is bad stuff, but when it gets old, it's really bad.