Question about 2003 Yamaha YZ 450 F

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Back fire and water cuming out of rad - 2003 Yamaha YZ 450 F

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You have a HUGE leak in the water jacket of the cylinder head of this bike. Better get it fixed quickly since water can leak into the cylinder bore and completely destroy the motor!

Posted on Dec 09, 2009

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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Does it show signs of over heating at all? When cool, take off rad cap & check level in rad & top it up. If down a lot, start engine, turn on heat & let run until you hear rad fan come on & check temperature gauge to see if normal operating temperature. Let it come on a couple of times, and top up rad an inch or so from top, then put rad cap back on. Top up bottle to proper level & try it. If it spits back into return bottle, try replacing rad cap.

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asuming the pump has been fitted in the correct way round and the pump isolation valves are open fully. have you tried closing down the radiator valves upstairs and forcing the flow around the downstairs circuit? also is there any zone valves on the circuit not opening.
Is it a conventional type system with a header tank ?

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