Launch RPM

[spencerperry]

Where's a good RPM starting point for a 1500 cc pro stock normally asperated motor with 44 lectrons and a 2 step lock-up. running 4.5-5lbs in 10 inch rear tire. My 60 ft. times suck!!!!!! keep spinning tire even with no weight on lower stage clutch arms. PLEASE HELP!!!!!


160 lbs rider.

[S2LR]

What RPM are you launching at now What is thecurrent spring pressure on your clutch Maybe you need lighter springs...

[spencerperry]

S2LR.


Thank's for your reply. Right now lauch is at 6600 rpm( I have ordered lower chips and hope to get them before the next race.) I am not positive of the clutch spring rate but They are the softest clutch springs I have ever felt. I have also wondered about putting a little ballast weight on the rear of the bike to help with hookup. At this point we have way more power that we can use so I don't think 8 pound's or so could do anything but help. Some time we get wheel spin all the way through 3rd gear.


Thank's for all your advice and help.

[Stuartracing]

Is shift light comming on or staying on or is your bike skating around...You sure the clutch is`nt slippng making you think the bike is spinning the tire..Just a thought...I`ve had the same feeling happenuntil someone actually watched my launch and saw that it was`nt spinning the tire...

[S2LR]

Yeah, mark the tire sidewall with some white shoepolish and then have someone watch or use a video camera to make sure it is the tire that's spinning.