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Old 08-31-2009, 09:51 AM   #1
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Default Head shim for ninja?

was wondering how many head shims should you be running on a 21 with 30% nitro fuel. my ninja came with 2 on it and an extra one, so i put the 3rd on when i started running 30% after break in
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Old 08-31-2009, 09:58 AM   #2
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was wondering how many head shims should you be running on a 21 with 30% nitro fuel. my ninja came with 2 on it and an extra one, so i put the 3rd on when i started running 30% after break in
run the stock shims with 30%.. if you run 20% you can pull the one brass shim out..
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Old 08-31-2009, 10:01 AM   #3
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run the stock shims with 30%.. if you run 20% you can pull the one brass shim out..
so your saying only run 2 with 30% instead of 3 like im running now right
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Old 08-31-2009, 10:06 AM   #4
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so your saying only run 2 with 30% instead of 3 like im running now right
stock...1 silver and 1 brass. the extra 1 in the box is just an extra that should stay in the box.
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Old 08-31-2009, 10:18 AM   #5
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stock...1 silver and 1 brass. the extra 1 in the box is just an extra that should stay in the box.
mine came with all brass im pretty sure but will dbl check when i get home and repost. thanks. but should be .3mm of head shim when u run 30% correct
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Old 08-31-2009, 10:28 AM   #6
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Default JX .21 shimming

the stock engine comes shimmed for 30% with 2 shims.
1 silver shim .008", and 1 brass shim .004

running 20% you could pull out the .004
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Old 08-31-2009, 03:49 PM   #7
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i am running 20% and have the head gasket and one shim. Would i get a performance advantage if i take out the copper shim?
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Old 08-31-2009, 05:22 PM   #8
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thanks guys when i got home i did have one two many shims so i took one out and left one silver and one copper, man does it run alot better. thanks again.
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Old 08-31-2009, 08:25 PM   #9
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i am running 20% and have the head gasket and one shim. Would i get a performance advantage if i take out the copper shim?
what head gasket?? there should only a silver and a copper shim, no gaskets.
if you have anything else in there other than 2 shims take it out, if you are running the 20% take the copper shim out aswell.
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Old 08-31-2009, 08:31 PM   #10
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Adro. I promise you that silver shim is a head gasket. Gasket's are not just made out of rubber and fiber mesh. THere are aluminum and metal gaskets as well. The compressors out at exxon have gold plated ones. It is to seal the head. they could be called shims too i guess. But if you don't have any in, it will suck/blow air.
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Old 09-01-2009, 02:24 PM   #11
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fair enough, i have never heard them called a gasket before which is why i said it.
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