rebuilt top end,mystery oil leak.please help - Yamaha Grizzly ATV Forum
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post #1 of 7 Old 10-22-2010, 05:53 AM Thread Starter
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rebuilt top end,mystery oil leak.please help

installed BBK(2002 660)& stage 1 hotcam.used manual think i did everything by the book.engine runs great,but ive got an oil leak i just cant locate the sourse of.pretty substantial leak.theres oil on the front left corner of the valve cover oil on thatfront left corner of the motor and spray on the left plastic cover near gas shut off.,near the valve cover.i completely cleaned entire motor and fired it up,trying to locate leak.i just cant find it.its a small leak so it doesnt show source while running in i take it for a short ride(5 minutes)come back in garage ,that left corner of engine from the valve cover down is wet w/oil and oil drips off of skid plate on the floor of garage.i did use tourqe wrench on all bolts to spec,i retourqed valve cover.cant find leak.anyone got any thoughts?
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post #2 of 7 Old 10-22-2010, 12:11 PM
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I would try using brake cleaner on the engine followed by compressed air. It cleans off all of the oil and makes it a dull grey look. Oil leaks are then easy to spot. Re run and inspect frequently.

I'm not familiar with the 02 660 engine. I had a 450 that had a plug that leaked on top of the engine. The oil would blow out the plug towards the front of the quad, hit the fan, and blow back everywhere. It took awhile to locate the problem.

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post #3 of 7 Old 10-22-2010, 04:02 PM Thread Starter
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tell me more about the leaking plug on ur 450.i did the brAKE cleaner trick,didnt narrow it wondering is the any breather etc on the front of motor that im not seeing?
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post #4 of 7 Old 10-22-2010, 04:26 PM
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Remove the valve cover and check the o-ring or gasket and eliminate that as posssible source. Make sure crankcase vent hose is properly connected and not plugged/kinked.

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post #5 of 7 Old 10-22-2010, 07:55 PM Thread Starter
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no gasket @ valve cover.yamabond far as i can see theres only one breather and its behind cylinder,is there any others?
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post #6 of 7 Old 10-22-2010, 08:31 PM
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I had a similar problem with the rebuild of my 600 grizzly top end , I had a loose bolt even though we had used the correct torgue settings. It took a while to spot which bolt on top had the leak. I had to remove the Head & re-tap the hole , also checked manual for bolt length. Hope this helps a little.

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Last edited by esibrogden; 10-22-2010 at 08:32 PM.
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post #7 of 7 Old 10-23-2010, 07:39 AM
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I had a similar problem on my 700 it was the oil feed line to the head the crush washer had a piece of dirt under it. I don`t know if the 660`s have a oil feed line or not.

Signature edited by GEARSLAYER in respect for the great late Mike Mayho known to us as Mad Mike. Mike's no longer with us people.

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