07-19-2008, 12:40 PM #1
150psi head w/only 100psi? Where did I Go Wrong?
I had Jim mill my stock head to 150psi. I removed the center layer of the stock head gasket(reused) and lightly greased it. I torqued everything correctly. Test rode it and it had no power. Now I only have 100psi on every cylinder. What did I do wrong?
Last edited by DaBigHert; 07-19-2008 at 01:56 PM.
07-19-2008, 12:41 PM #2
Are you checking wuth the throttle open, and the other 2 plugs in ?
Whats the altitude ?
07-19-2008, 01:12 PM #3
All plugs out, at sea level. I forgot to mention the ski was in the water before the test and running like crap.
07-19-2008, 01:20 PM #4
Did you put washers under the head bolts to compensate for the single layer gasket and head milling???
07-19-2008, 01:35 PM #5
It's 2 layers, not 1. Jim said I did not need washers.
07-19-2008, 01:38 PM #6
If there is old loc-tite in the thread holes you may be shanking out the bolts.
07-19-2008, 01:39 PM #7
07-19-2008, 01:51 PM #8
07-19-2008, 01:52 PM #9
- Join Date
- Apr 2006
- panama city beach 'fl
is it a 1200 pv motor? sometime you may have to unplug power valve servo to test ,they lift a little at start up to lower compression,also is gage good?try someone else
1200 has 3 piece gasket -1300 two
07-19-2008, 01:55 PM #10
I'm sorry, yes it's 01 gp1200r pv engine. Gauge is good. I had it out on the water and it had no power. It's not the gauge.
Last edited by DaBigHert; 07-19-2008 at 01:58 PM.
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