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How to adjust valves on a 660

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Old 07-07-2009, 08:48 PM
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How to adjust valves on a 660

Any help ??
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Old 07-08-2009, 04:12 AM
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First Name: Kevin
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Wrench

what year? I have instructions for 06'- pretty easy to do. Send me an e-mail to bruhaun@yahoo.com and I'll send to you- kb
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Old 07-08-2009, 07:36 AM
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Just like he said not that hard just takes a little time.
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Old 07-08-2009, 07:49 AM
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Yamaha Rhino Service & Repair Manual

Heres a copy of the factory service manual. This will show you how do to just about everything.
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Old 07-08-2009, 07:52 AM
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This is what I did. Of course covers off and remove spark plug and valve adjust covers. You can reach the 4 bolts that hold the plastic fan cover on (10mm). Then a plastic plug for the timing marks. Use a quarter to remove the plug.

I didn't remove the tank or the bed. I did however remove the CVT pipe that comes from the front of the engine to above the head of the motor. Easy to get off, sucks to get back on.

I stuck a screwdriver in the sparkplug hole and rotated the nut next to timing hole counter-clockwise. I don't remember the size of the nut. Hold the screwdriver that's in the spark plug hole and let in move in and out with the piston freely (don't let it bind). Watch the valves and when the piston is coming up on the power stroke watch as the screwdriver nears TCD. Shine a light in the timing marks hole. Mine had 3 dashes and I stopped at the center one. There's a slot in the side of the timing plug hole that should line up with the marks.

I used a .005" and .007" gauge for the intake and a .007" and .009" for the exhaust. I bent my gauges about a 1/4 inch from the end at a 45 degree angle. Mine would snap if bent with a tool so I bent with fingers to get a gradual curve. The .005" is the measurement for intake and the .007" is a no go gauge. Same with the exhaust but .007" is the measurement and .009" is a no go gauge.

The intake is easy. Do a initial check and of course if you don't have to adjust, then don't. If adjust, first break loose the nuts and then snug them. Next put a wrench over the nut and hold the square with small needle nose pliers. I loosened the nut while holding the adjustment then move the adjustment bolt then re-snug the nut. I kept this up until I had them good and then tightened the nut good but didn't check the torque spec. The .005" should be able to go in and feel like normal shim type resistance and the .007" shouldn't fit in.

For the rears I went from the passenger side and held the 10mm in the left hand. A long 10mm would work great I think. I held it under the frame and then held the adjust screw with the right hand and did the same type of adjustment. Loosen the nut move the screw and re-snug the nut.

After that I did my adjust and then went through several revolution of the motor and realigned TCD and then recheck. I checked the valves 3 times after final adjust this way and when I was satisfied they were the same spot each time, I decided I was done and the engine did run great.
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Old 07-26-2009, 08:39 AM
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just adjusted my valves on my660 runs good but seems a little noisey any sugestions thanks mick
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Old 07-26-2009, 08:48 AM
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They sound loose. You shouldn't hear the valve noise.
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Old 07-26-2009, 10:04 AM
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checked manual .005 on intake .007 on exhaust a little loose used manual specs and sound much better thanks
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Old 07-26-2009, 02:17 PM
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Just remember--a tight valve (too tight) will burn quickly, due to inability to transfer head from the valve face to the cyl. head.

Due to this, it's always better to have the valve a bit loose than a bit too tight.....
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Old 12-15-2010, 10:19 AM
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So newbie here. I know just enough to be dangerous. I was adjusting my valves and getting lots of noise when done. I know I did them to spec. The manual list 10-15 thousands intake and 15-20 thousands for exhaust.
The one thing not mentioned is that you cannot adjust both valves at the same time.You need to adjust intake valves when they are not moving then rotate crank until exhaust valves are not moving.

I, probably like some here was adjusting the valves at TDC without rotating crank.

Am I correct? Someone please chime in.
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