an someone please let me know the correct front fork oil volume required for the ´91 Yamaha XT350. Also, any suggestions on what may be causing an Intermittent poping noise when motor in warming up. The engine has always started hard, {several kicks needed} when cold, as of late there is a popping noise which I believe may be coming from the decompression release, not sure why. Any suggestion on what may be causing this and what I can do to correct it?