Stage 4 is the step to turn your motorcycle into a cannon. Of course everything from the Stage 3 kit but now with Big Bore kit from S&S consisting of cylinders and pistons and the hot 550 camshaft from S&S, combined with high lift valve springs.  

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The kit is available for all M8 models, the 107 goes to 124 and the 114 and 117 models to 128 ci (2100 cc) with a compression of 11.1 to 1. ​

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The kit comes with chain driven camshaft or sprockets each with its pros and cons. Also the choice of a torque or power camshaft and black or chrome push rod sleeves. There are also various options with the paint of the cylinders that perfectly suits your Harley.  

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Included in the price are ARP studs for the rocker arms and a set of black reusable S&S head bolts. Larger injectors also go into the injection body.  The coupling with a TPP pressure group is also changed to handle the high power. New valve cover gaskets and oil and oil filter.

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The costs of Stage 4 are 7500 euros.

(including assembly and adjustment and dyno proof)

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I assume that there is already another muffler and air filter housing on it, otherwise I can also supply and install these.

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This kit can also be combined with a special custom cam for an extra 400 euros.

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This kit can also be combined with a Thundermax instead of Diag4Bike for 800 extra.  

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The kit can also be expanded with machining the head with larger valves and seats.

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Larger Throttle body, a Screaming Eagle head, call for the possibilities........

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