Question about 1993 Yamaha XJ 600 Diversion S
Go to premium gas if you are not already using it. The problem may just go away after the first tank. This would be the case if pre-detonation is the problem. Change to a colder spark plug to lessen any pre-detonation as well. Per-detonation is caused by carbon build up on the head and piston. The carbon gets red hot and ignites the fuel before the spark plug sparks. Other possibilities in sequence of likelihood are >> tappets, OHC chain, piston slap, piston pin wallowing out the piston mounts, crank bearings. Please rate my answer. Thanks!
Posted on Apr 01, 2011
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Posted on Jan 02, 2017
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