Quote:
Originally Posted by g-man
Changing cam lift on a RC51 should only be done on a dedicated race motor and with a very clear understanding that if you use cast cams you will end up snapping a cam at some point. The same results are not uncommon if you raise the hard rev limit on the bike.
The best bang for your performance dollars is high compression pistons (if you are using JE keep in mind that they were originally HRC copies and require HRC heads to get to the rated compression figures), stage one cams, airbox, head/port work and finally doing everything you possible can to put the bike (and rider) on a diet. If you are going through this much, lightening the crank and rods is a must as well.
FWIW, adjustable cam sprockets are not required on the RC51 as the timing can be altered using a PowerCommander PCIIIr.
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+1
But here are some of my notes,
Billet cams are necessary to avoid snapping.
HRC Springs are about as good as your going to get, make sure to get the HRC retainers and HRC seats as well.
13mm is as much as the HRC parts will allow and I would not expect it to do so for extended periods of time.
Careful with the cam timing and additional lift, check for piston to valve clearance.