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FJR Motorcycle Forums
Technical & Mechanical Problems
Bike Wont Start
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<blockquote data-quote="Diablo1" data-source="post: 1461737" data-attributes="member: 91933"><p>That’s an unusual amount of carbon on the pistons for the mileage. What do the plugs look like? Does your bike get normal gas mileage around 40-45 mpg? Was the oil overfilled? Is there oil or heavy carbon on the backside of the intake valves? It’s possible that your oil rings are allowing oil up into the combustion chamber, and I’d be asking if Yamaha made some change in recent years to the rings. Manufacturers have been reducing ring tension to lessen friction and this sometimes causes excess oil consumption. Does your bike use any oil between oil changes? How much if any oil do you add between oil changes? I would also check the crankcase oil and have it analyzed for gas contamination. If you have a leaking injector that dilutes the oil, the lowered viscosity may allow the oil to get past the rings.</p></blockquote><p></p>
[QUOTE="Diablo1, post: 1461737, member: 91933"] That’s an unusual amount of carbon on the pistons for the mileage. What do the plugs look like? Does your bike get normal gas mileage around 40-45 mpg? Was the oil overfilled? Is there oil or heavy carbon on the backside of the intake valves? It’s possible that your oil rings are allowing oil up into the combustion chamber, and I’d be asking if Yamaha made some change in recent years to the rings. Manufacturers have been reducing ring tension to lessen friction and this sometimes causes excess oil consumption. Does your bike use any oil between oil changes? How much if any oil do you add between oil changes? I would also check the crankcase oil and have it analyzed for gas contamination. If you have a leaking injector that dilutes the oil, the lowered viscosity may allow the oil to get past the rings. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Bike Wont Start
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