Post by phssthpok on Jun 15, 2015 21:16:32 GMT -5
So the scoot's running great. Reliable, good power (for what I want), and making decent speed...but she's got more in her, I can tell. She tops out at ~60* at a little over 6000rpm. Generally, with a slight headwind, she'll hold 55@6000*all day long and sing a happy tune while doing it, though she takes a while to get there (compared to stock). I know these engines can do better RPM-wise without getting to the point of being hard on them, but I'd like to keep the same speed-RPM ratio, while increasing the 'top-out' rpm and I'm not quite sure how to go about it. I'm thinking if I do anything to the transmission set-up, I'll alter the MPH-RPM ratio, which is what I want to avoid.I like running ~50 at such relatively low RPM.
Right now I'm running with a 155mm variator (stock face/fan), 12 gram sliders (NOT Dr. Pulley), stock clutch mainspring, and (I think) 1000RPM clutch-arm springs. Are power increasing mods my only options? I'm hoping to avoid them as more power (generally) requires more fuel. I've pondered an aftermarket header to free up the breathing, but I'm not thrilled with the cost investment required (for just what amounts to just a bent pipe), plus the (probable) need to re-jet. I figure if I'm going that far I'd probably just spring for a BBK as well...and now we're *really* talking money and time invested.
So here's the question I'm posing: How can I increase my top-out RPM *without* affecting my MPH-RPM ratio at cruise?
*(Chinometer, level ground, no wind. Had a co-worker GPS the scoot and he reports that it's about 4 MPH fast @55mph)
Right now I'm running with a 155mm variator (stock face/fan), 12 gram sliders (NOT Dr. Pulley), stock clutch mainspring, and (I think) 1000RPM clutch-arm springs. Are power increasing mods my only options? I'm hoping to avoid them as more power (generally) requires more fuel. I've pondered an aftermarket header to free up the breathing, but I'm not thrilled with the cost investment required (for just what amounts to just a bent pipe), plus the (probable) need to re-jet. I figure if I'm going that far I'd probably just spring for a BBK as well...and now we're *really* talking money and time invested.
So here's the question I'm posing: How can I increase my top-out RPM *without* affecting my MPH-RPM ratio at cruise?
*(Chinometer, level ground, no wind. Had a co-worker GPS the scoot and he reports that it's about 4 MPH fast @55mph)
