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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Engine Blue Printing
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[QUOTE="usgpru27, post: 874125, member: 58332"] Maybe one simple example is the difference I see between a dirtbike crank and a roadrace 2 stroke crank. From reading the posts on this forum I see that most just buy a crank and put it in. They are fairly good from the factory. In our roadrace bikes the crank is rebuilt and what we call balanced. In doing so it is set so that run out is set to .001 run out. Just about perfect. This costs about $200 over and above the $250 for the crank. It is an issue with application. The road race bike is simular to the supersport bike in that you are trying to bet the most out of the motor. A perfect crank may result in .2 of a HP over an out of the box unit. It is also presses together with an exact width measured in the cases. Again making it a perfect fit. Not sure if this helps. I plan on blueprinting my dirtbike in certain areas like the crank. To me it makes for a smoother running engine and yields maximum part life. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Engine Blue Printing
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