Originally Posted by wildmetal
well think i have got to the bottom of the problem . compressions . 50psi in one pot and 70psi in the other manual is saying it should be beetween 139psi and 213psi . but just 2 b sure i am going to recheck the valves clearances tonight . but i think its an engine out jop anyway . just need to sorce an engine or head barrels and pistons and valves i think
Put a few drops of engine oil in the pots then check again...
If the compression goes up, the problem is the rings/cylinder/head gasket
If it doesn't increase, its likely to be the valves.
Also, not wanting to patronise in any way but loads of people get compression readings wrong. They should be done with a WARM engine with the throttle WIDE open..
Also, if you have a £15 compression tester bought out of a magazine, bin it ! They're GROSSLY inaccurate, especially if they are the plug in type. You need a screw in !
The only way I can trust them is if I compare the readings with another bike that I know is healthy.
2001 NX650 Dominator.
BMW Dealer Technician
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