A local acquaintance is building a big bore bike for top speed runs at El Mirage and Bonneville. He is not much of an internet person but a good guy who needs any and all info he can get. Top speed is the only priority here. Obviously getting as much hp as possible at the top end is what he's looking for, weight is not a problem, the more the better actually. He's got 60 lbs of lead shot in the swingarm right now!
The bike, a '99 'Busa, currently has a 1397 kit with 12.5/1 (I think) weisco pistons, Lightened Crank, Counterbalancer removed, Mild head porting, PC II, Small box mod (soon to be full box mod), Yosh Stage one cams, HMF big bird system, 18/40 gearing (soon to be 18/38 or ?) He went out to El Mirage about a month ago and went 185 through the timing lights on the lakebed. The dyno pulls last night netted a disappointing 190-192 hp.
I hoping for some suggestions to help this guy get at least 200 hp or so. What would help?
TRE?
Clutch mods or replacement parts (any and all that would help in this application)
Degree work on the cams for more top end? (torque and drivability are of no real concern)
Ram air seals? (I know this won't show up on the dyno, but there are some that do help at speed aren't there?)
Motor oil type?
Chain and sprockets?
Gearing suggestions?
Lowering bike? (dog bones? front end strapping?, clip ons and drop the fork through a bit?)
Double bubble windshield?
More aerodynamic helmet and suit?
Any and all other advice?
There's a decent budget for what needs to get done, we're just looking for good advice from some of you tuners and top speed guys.
Turbo is not an option right now because of class restrictions.
Thanks everyone for any help they can offer.
Gar
The bike, a '99 'Busa, currently has a 1397 kit with 12.5/1 (I think) weisco pistons, Lightened Crank, Counterbalancer removed, Mild head porting, PC II, Small box mod (soon to be full box mod), Yosh Stage one cams, HMF big bird system, 18/40 gearing (soon to be 18/38 or ?) He went out to El Mirage about a month ago and went 185 through the timing lights on the lakebed. The dyno pulls last night netted a disappointing 190-192 hp.
I hoping for some suggestions to help this guy get at least 200 hp or so. What would help?
TRE?
Clutch mods or replacement parts (any and all that would help in this application)
Degree work on the cams for more top end? (torque and drivability are of no real concern)
Ram air seals? (I know this won't show up on the dyno, but there are some that do help at speed aren't there?)
Motor oil type?
Chain and sprockets?
Gearing suggestions?
Lowering bike? (dog bones? front end strapping?, clip ons and drop the fork through a bit?)
Double bubble windshield?
More aerodynamic helmet and suit?
Any and all other advice?
There's a decent budget for what needs to get done, we're just looking for good advice from some of you tuners and top speed guys.
Turbo is not an option right now because of class restrictions.
Thanks everyone for any help they can offer.
Gar