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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › What is the shim size in a 91 C-spec PS?
07-23-2006 03:42 AM  14 years ago
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bperry

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Detroit, where we eat the dead

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What is the shim size in a 91 C-spec PS?
What is the shim size in a 91 C-spec PS?

And what can I shim it to to make it smoother?
Where can I get the shims?
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07-23-2006 03:47 AM  14 years ago
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rrVeteran

Bridgeport,CT USA

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the one that comes in the engine is .008 , the shimming depends on the fuel you are using ,the more nitro the more shims, for 30% it would go with 16 thou, maybe 20 thou if using magnum ,you can get the shims at ricks in the os 91 parts section.how'd the ground come up like that ?
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07-23-2006 04:08 AM  14 years ago
bperry

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OK I am running 30% CP and wanted to go to 16 thou but I can't seem to locate that shim on rick's or any other site for that matter. I will call them tomorrow. Also are you sure the C-spec has only 8 thou shim I thought it was the SZ that came like that.
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07-23-2006 04:12 AM  14 years ago
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the part numbers are :SHIM91SX2 and SHIM91SX4 , you can get them in 2mm and 4mm. or you can get a gasket set and use the shim in the bag.how'd the ground come up like that ?
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07-23-2006 02:16 PM  14 years ago
bperry

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OK cool I will get a few. Is it ok to put two of the 4 thou in with the 8 thou for a total of 16 thou. Why don't the just have a 16 thou shim??
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07-23-2006 02:18 PM  14 years ago
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Bridgeport,CT USA

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they do have an 8 thou shim , the stock one, you can put two of those together.how'd the ground come up like that ?
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