Question about 1981 Yamaha XJ 650
3 things can make a engine run hot
1 lean fuel mixture
2 late in spark timing
3 timing chian is stretched
1 check spark plug colour to determine if burning lean
2 advance timing, on points turn plate but eletronic need to change pick-coil loaction
3 adjust chain tensioner or major overhaul replace chain, would need to get a manual for this repair
Posted on Nov 17, 2009
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Posted on Jan 02, 2017
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