XR100 Big Bore 

Thank you!

Thank you! That means a lot to me.

Thank you very much . I hope this helps.

There's only 2 ways oil can get into the combustion chamber, rings or valve guide seals. So be sure to replace the seals and check the ring fit in the new cylinder before tearing down your motor. Cheers.

I'm glad I could help.

I made it. It's a piece of 3/8" round stock. I drilled a hole down the middle using a mini lathe and added a set screw to hold the valve in place.

@@ronporteous1411 thank you sir!

​@@ronporteous1411 that is brilliant and simple 👍🏽🇺🇸