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Old 11-02-2007, 09:56 AM   #1
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Default Novarossi P5X

I have a p5x hot modded, I just had pinched, I also put new bearing's in it and I lost the head shimm's, so I got new one's,The question I have how much should I shimm the button running 30% O'Donnel fuel?? anybody know?
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Old 11-02-2007, 11:09 AM   #2
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I'm not sure what shims I have in mine, but it's been working great on 30% for some time now - ever since I got it.

I would email or call Fusion - the new novarossi US distributor, and ask them...

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Old 11-02-2007, 11:19 AM   #3
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I believe its a .20mm shim up to 25% Nitro and add a .10mm shim for 30%. You really need to check the shim thickness that your installing to make sure. Novarossi has a mutlitude of different thickness shims. The main thing is detonation. If get no detonation as is on 30%, you should be OK.
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Old 11-02-2007, 11:34 AM   #4
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the shimms I got are .10/.004 5 in total was thinking of using 2 of them
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Old 11-02-2007, 03:20 PM   #5
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They usually use 1 or 2 aluminum (they are thicker probably around .01 thousandths) and one copper, Do not use just 2 .004 shims!
Use a caliper, measure down from the top of the sleeve to the piston at top of stroke. (make sure sleeve is down all the way) Then measure the head button from the bottom(part that goes into the cylinder) to the seat where the shims go. The head button should measure .026 less than the cylinder measurement.

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Old 11-16-2007, 03:47 AM   #6
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mine was running great out of the box and i only run 25% do i need to run 30% in it. it has power every where with a jp3 pipe or is there a better pipe to get more from this engine
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Old 11-16-2007, 04:27 AM   #7
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Quote:
Originally Posted by v1r killer View Post
mine was running great out of the box and i only run 25% do i need to run 30% in it. it has power every where with a jp3 pipe or is there a better pipe to get more from this engine
mugen 1005 wich is now made by bullit racing
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Old 11-16-2007, 04:55 AM   #8
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much more power out of that or just better fuel time?
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Old 11-16-2007, 06:20 AM   #9
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Quote:
Originally Posted by 22Racer View Post
They usually use 1 or 2 aluminum (they are thicker probably around .01 thousandths) and one copper, Do not use just 2 .004 shims!
Use a caliper, measure down from the top of the sleeve to the piston at top of stroke. (make sure sleeve is down all the way) Then measure the head button from the bottom(part that goes into the cylinder) to the seat where the shims go. The head button should measure .026 less than the cylinder measurement.

Rex
Your measurements are in inches for head to piston clearance, correct?

I just went over some data, and the P5X comes from the factory with 2x 0.30mm (aluminum) & 1x 0.10mm shim (copper). Please check this to make sure this is what you have BEFORE removing or adding any shims. Novarossi states this is for 25% nitro. My suggestion is if you removed or added shims, is to use the pinched solder method ahd check your head to button clearance before running the engine. In general, for 30% nitro with stock shims, add 0.10mm shim to the stack and that should be correct. I believe .024-.026 inch of clearance for 25% and .028-.030 inch for 30% nitro is the general rule.
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