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Old 11-01-2008, 07:02 PM   #1
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Questions?? Mr ninja .21 offroad head shi question

I picked up a Mr Ninja off of Ebay for next to nothing I raced it last night and it ran pretty good but it really dosent have much compression. My questions are

I took the cooling head and button off and its got 1 thick head shim, I don't have calipers to measure it. Can I run it without any head shim to gain some compression. I do have 2 real thin shims that came with my new GRP that I know will fit.

I was told to take my motor over to M2C Racing and have it pinched?

The motors tight newer bearings just not the greatest compression is 1 option better then another?

Can I get away with just removing the head shim totally or will it mess up the timing.

I run Byron gen 2 in all of my motors

Thanks
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Old 11-01-2008, 07:09 PM   #2
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it will mess with the timing....best bet is to send it off and get it pinched. should not cost much..i know a guy that goes by the name of osrocket and he does a great job.. do a search on him and you can find him. he lives in lexington, ohio...
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Old 11-01-2008, 08:17 PM   #3
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Default Calling All Mr Ninja .21 owners Head Shim ?

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Originally Posted by buckeye34 View Post
it will mess with the timing....best bet is to send it off and get it pinched. should not cost much..i know a guy that goes by the name of osrocket and he does a great job.. do a search on him and you can find him. he lives in lexington, ohio...

So what will happen with no shim? It changes timing but how much?

Thanks for the input! I really would like to hear from someone that has tried it?
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Old 11-01-2008, 08:31 PM   #4
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ive ran with no shim, it helps but its gets really hot and the engine might start to detonate wich isnt good. so i would run one thin shim. try that
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Old 11-01-2008, 08:41 PM   #5
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Default I stand corrected

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So what will happen with no shim? It changes timing but how much?

Thanks for the input! I really would like to hear from someone that has tried it?
Sorry I looked at the button again and there are 3 thin shims so my question remains; what happens if you remove 1 or 2 shims?
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Old 11-01-2008, 09:11 PM   #6
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better performance, remove 1 and try running if it runs hot then you should put the other back on. if it runs fine take the other off leaving only one and see how that runs
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