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Very frustrated after fully rebuilding this engine and following proper torque with everything it seems that it is leaking oil out of the head gasket when the bike is warm there appears to be an oil film that covers the black head gasket on the right and left side, and down the fins. I was...

i have an 81 XS400 and my bike came with the non adjustable slide needle with the preset clip position. My carb rebuild kit came with the adjustable needle with the multiple clip positions. I noticed there was a size difference as well when I got to looking at it: the new one seemed much...

orderes the gasket set from Mike’s-xs, and unsure where all of the o rings go to. I don’t recall seeing any of them besides the red ones upon tear down. There’s about 4 of one kind, and a few other sizes. I have an 81

I am ordering plane bearings for my 81 xs400 special and would like to know if the 1l9 will be the same as the 12r. The “suffixes” are the same.

Hello all I have recently introduced myself on the forum but have since forgotten my username and password so started a new account. I’m from Cincinnati I work three jobs and go to school for auto tech. My current project is a 1981 Yamaha XS 400 special I got for 150 from a friend. The bike sat...