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I got my new main jets today in the mail and trying to determine if they are the right ones. I have a 1980 xs400 special II. My haynes manual says 147.5 for the main jets but in the back under the "newer bike" section covering my 1980 it says 135. So i ordered 137.5, 140.0, and 142.5. I set them...

I changed the oil on my bike last week, and went to dump the used oil today out of the catch pan and found a spring in there :wtf:. I looked in the manual and couldn't find any pictures to show where it might go. What is this for and is it bad that i ran the bike for about 20 miles without this...

So I think my bike is running lean, I just got it going after cleaning the carbs and put about 100 miles on it the past couple days. I checked the plugs and they are still white, and the pipes right off the manifold look yellow. How hard on it is it to keep running it lean and what can I do...

Hello everyone, my name is Ryan I'm 23 and from MN. I just got my first bike a few weeks ago and got it going but it needs a little tlc and I'm just looking for some tips and what not. I am a auto mechanic by trade but new to bikes. I'll give you some details...It has different exhaust on it...