Stage 5 is the superlative. The block becomes  converted  with a 124 kit from S&S. This kit consists of a stroker crankshaft with a stroke of 4 5/8" and a set  cylinders and pistons with a 4 1/8" bore. Complete with 640 ez start gear driven camshafts, tappets, gaskets and S&S cylinder heads.  

 

Actually, only your crankcases are used. These are bored in-house for a 4 1/8" bore.

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A 124 kit for your motorcycle costs 7000 euros excl. assembly

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But then you are not there yet!

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The crankcases from 1999 to 2002 already have a timing set-up, but the later models do not. This is necessary because the standard bearing is not strong enough. The timing set up costs 500 more  including the right bearing.

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You also need a new oil pump and usually a cam support plate.

These are between 500 and 800 euros.  

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The  carburetor  models go to a large S&S Super G with an adjustable ignition, which costs an average of just under 1500 euros. Or if you have a good injection system with bigger injectors and a big throttle  body. I always take a Thundermax complete with an S&S 66mm intake and injectors which costs around 2500 euros.  

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The clutch must also be adapted for the force of around 220 Nm and at least 140 hp at the wheel.

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For a complete set, installation and removal, starting and running, the costs are 12,500 euros for a carburettor version and 13,500 euros for injection.  

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