Question about 1981 Yamaha XJ 650
My dads 81 650 special will not stay running when its warmed up. Its like its losing spark maybe? Also leaks oil through the carb into the air cleaner on left carb and a little oil out the clutch cable hole.
This is an XS 650, no? Sounds like you might have some piston ring blow-by (especially if its burning some oil), or possibly bad valve seal's'. The valves could be tight, so make sure the valve clearance is correct first, then compression test, and finally a 'leak-down' test.
If it is blowing by, it probably is fouling plugs and you will need more energy in the spark to fire, but this is a secondary issue, which will be eliminated with the fixing of the other issues. Good luck!
Posted on Jun 25, 2009
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Posted on Jan 02, 2017
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