Question about 1996 Yamaha Royal Star XVZ 1300 A
Bike set for 3 years carbs varnished badlry had carbs cleaned and bike serviced aprox 14 months ago have been riding all year ran good starting fouling plug # 3 thought running rich took carbs off inspected # 3 carb did't find any problems reinstalled carbs and still have problem I think poss. valve stem seal compression on # 3 240 psi
What is the compression on the cylinder compared to the other cylinders? It should be within 10%. Some causes can be - as you suggested - the valve stem seals. Also, the sleeve could be rusted, as the valves could have been open on that cylinder. Generally speaking, on a 4-cylinder motor 1 cylinder has both its valves closed, 1 has both open, 1 has an inlet valve open and one has an exhaust valve open at any given time. Another possibility is that the valve could be sticky - try Wynn's Valve Ease or a similar product.
Posted on Jun 18, 2009
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Posted on Jan 02, 2017
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