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F75 flywheel wont turn

K

KMD

Member
F75TLR, I believe 2004 not sure of age low hours 400. Its been sitting in the down position for about 5/6 months. It ran fine last time I used it. I went out today to start it to get fuel flowing through engine and it would not turn over. I pulled spark plugs, put an adjustable wrench on flywheel bolt. I can get it to turn but it takes all the force I can put on the (12/14" adjustable wrench) to get it to move. I can tell its moving because I can see the timing belt moving also. Any idea what the problem is? The oil looks good on the dip stick.
 
Check gear oil first.---This vintage of Yamaha is known for severe internal corrosion of powerhead.----Compression test and leak down test might shed light on it.----Or a boroscope to look for rust in cylinders.----Or your dealer might explain more.
 
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