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Novarossi .21 Long Stroke (P5/421B/Plus 21-5) Head Shim Set (0.10/0.15/0.20/0.25/0.30mm)
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This is a combo pack of five head shim gaskets for Novarossi Long Stroke .21 engines, such as the P5, 421B, Plus 21-5. Included in this pack are with one of each different size (0.10, 0.15, 0.20, 0.25 and 0.30mm) of head shim. This will work with any Novarossi brand engine including the Top and Rex lines. The head shim is the thin circular piece that goes between the head button and the top of the cylinder sleeve and can be used to adjust and fine tune the compression of the engine. In general the higher the nitro percentage of the fuel you run, the more head shims you should put in your engine. Please consult the instructions that came with your engine for details about how much your engine should be shimmed!
This product was added to our catalog on April 11, 2005.
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