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Back in 1996 I sat and did 60 plus dyno runs trying to find the best combination of air box combinations, various plenum configurations to jet combinations and came to the conclusion that some mild jetting changes with the foam pod inserts removed were about as far as one could go, without compromising performance. Degreeing the cams
with notched sprockets has beneficial effects but doesn't last. The only real performance gains were the removal of the stock carbs and replacing them with 39 FCR's. This gave massive gains across the board, taking the hp from low 90's to 103 without jetting changes - straight bolt on with the given jets. Further dyno time allowed 109hp without compromise - this was in FL in summer ie sea level hot & humid. Since, with various pipes and using a SOTP dyno, greater increases were acquired - the bottom line in my experience is that you can only go so far, which isn't very, with the stock set up, apart from rideabilty(smoothness). The key to performance though is probably notched sprockets, but whether it's cam chain stretch or the notching slipping I'm not sure but the gains seem not to last???? The FCR's cost $1000, which cutting to the chase was the best bang for the buck enhancement - all the other tweaking was a waste of time but fun - with fcr's pods are all you can use as filters. Whatever you hear about FCR's being finicky is partly true, but rideabilty is fanastic - they are more sensitive to temp and altitude, this can to a greater degree can be factored in - a freer breathing exhaust is a good idea. Just to throw fuel on the fire :-D
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