Hello everyone, I have a 1975 XL70 that was my first bike I'm working on in my spare time. Several years ago, i was riding it when it jumped time and bent a valve. We rebuilt the motor and replaced the bent valve, rings, etc. Ever since it was done, it has smoked, fouled plugs occasionally, and it has an unusual miss. When it has a load on it, like when pulling me up a hill, it sounds normal. Strangely, it still starts very easily. My best guess at this point is that when the valve got bent, it messed up the valve guide, but we did not know to check that when it was apart. My only other idea is that the rocker or rocker shaft on one valve could also be to blame, but that's doesn't seem like a reason for it to smoke like it does. So my question is, does the valve guide sound like a logical reason for it running like it does? It ran great before the rebuild, so it's possible it could be out of time, but that doesn't explain the smoking. Thanks for any advice that can be offered.