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Alan L Alan L is offline
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Join Date: Apr 2006
Location: New Zealand
Posts: 3,245
Pat - where the piston protrudes is not quite the issue - it is where the lip on the head of the piston sits in relation to the slits. This is adjusted by your idle mix screw. The fact you changed heads and have quite a different idle mix is expected - when I change pistons I have about 1 turn difference on the idle mix screw to pick up the same point/idle mix. Lean the idle off and lower the warm WUR pressure (lean mid range). You probably have done this.
If it still dumps loads of fuel without any boost signal at 3000 rpm (I suspect it might) - you would do well to try and monitor the WUR pressure at this point.
BTW - I don't drain my oil to to valve clearances - just run motor for few minutes to clear 'sump'. Then jack up on side - drains any oil back down the tubes. You may loose/catch a cup full when removing lower covers. Engine will cool down enough while you remove covers etc.
Alan
Old 06-25-2008, 11:56 AM
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