Hey everyone, I'm trying to figure out if the rpm's I'm seeing on my setup are normal or not. I've got an MHR Rep cylinder with a C16 pipe, Arreche 19mm carb with 105 main, black Clutch springs in my Delta, red torque spring, and (3)3.0's and (3)3.5's rollers. The take off is a tad slow but when that C16 hits the powerband, she SCREAMS!! I'm seeing rpm's in the range of 10,000-13,500!! Is that normal?
yup.. there pritty revvy kits.. set the clutch tighter/use stiffer springs to loose the flat spot when you pull away. the clutch shouldent engage till just befor the bottom of the powerband (little into it if your brave) but yes those arpm's are about usual for the kit/pipe used..
thanks, that's the first response that I've heard confirming these revs. I feel a lot more comfortable knowing that I should be working in that range. So on my Delra I've got the black springs in, which are supposed to be the heaviest. Should I change the weight position? The weights are set closest to the edge, if that make sense. I know you can set the weights in more, causing more tension on springs. Should I be setting the weights tighter?
try the lightest springs with the weights all the way in (more force needed) if its not revving enough bang the other springs back in and wind it up bit by bit.. i recon the soft springs on max setting should be good tho as theres less weight to the clutch.. haveing the heavy springs with the weights so far out is a bit of a waste of time.
But won't going to lighter springs allow the clutch to bite sooner than it should? Right now, I've got the classic "slow till about 10mph" then it takes off. If I go with an even light clutch setting, won't it want to grab even sooner when the revs are at a lower rpm? It seems like I should be doing the opposite? Right?
wrong.. you have the weight all to the outer setting.. so theres more weight there.. if you move the weight closer to the shoe pin the force required to move the shoe out is greater.. so start with soft springs and put the weight as close to the pivot end of the clutch as possible.. then if the revs are still not high enough you can slowly work up on the heavy springs.. always try and keep the clutch as light as possible (light springs with the weights removed can work with some setups.. or just drilling out material from the shoes altho your better off going the proper way) i should do a clutch guide really
ok, I'm going to try that right now. I'm going to go with the blue springs and the weights closer to the shoe pins. We'll see how that works. It seems backwards to me but, I'll give it a try. I just went out and rode it and it was at 13,500rpms and only 44mph!?!?! WTF?!
So I messed around with it a lot this weekend and I started getting revs of 13,500 with a top speed of 44mph!! I thought about it for a bit and remembered that I had changed the pilot jet as well as the main. So I put the pilot jet back to a 103 and a 105 main, and it started to have better throttle response throughout the throttle range. Once I felt that I got the throttle and motor dialed in, I started to focus on the tranny only. I drew a thick black line on the variator face, and at first I had almost 1/2" of unused area. I went from red torque to yellow, back to red, I used blue clutch springs, then black, 6.5g rollers, then down to 3.0's and back to 3.8's. After all the tweeking, I've got this setup now and these results. 103 pilot and 105 main jet 3.5g rollers Yellow torque spring Black Clutch springs with weights set to position 1 (stretched spring) Speed = 48+mph, on a short run. Speed will for sure get up to the 50's rpm's = 9,500-10,000 cruising, 11,000+ once on a downhill, but not above 13,000 O/R range= Complete usage of variator but I still have a slightly slow take off. Slow enough that I don't feel comfortable taking off in traffic. So at lunch, I'm going to lighten the rollers even more, this should raise my rpm's a little bit and get me a better take off.
48mph is a bit slow to be honest, especially if thats clock speed!! Runner speedos over exaggerate a lot like most 50cc scooter speedos...but!! I get 67mph clock speed on the straight with my MHR rep...which is about a genuine 55mph (about right for std 50cc gearing) just out of interest i could acheive that speed with my polini sport kit too, the rep gets there a lot quicker though so if your only getting 48mph clock speed i would say thats quite a bit down really
wind the clutch up a little for more rpm at takeoff... sounds like the rollers are a little light tbh. throw a gear up at it if you havent already.. whats the exact spec?
The clutch is set as tight as possible right now. Black springs, light weights, both weights are set at Pos. 1. The rollers in there right now are 3.5g's. Here are the exact specs of what's on the scoot. 02 Zuma: MHR Rep 70cc UNIfilter Malossi Delta II 107mm Clutch and Winged Bell, Black Springs, both weights at Pos. 1 Malossi O/R Tranny w/3.5gm rollers Yellow Torque Spring MHR Kevlar Belt YASUNI C16 Exhaust Arreche 19mm Carb, 103 Pilot jet and 105 Main jet Athena 15/50 UpGears Stage 6 Reed Cage Stage 6 Racing Forks BGM Nitrogen Rear Shock Brembo Brake Caliper TNT Intake Scoop Koso Tach NGK Plug - BR8HS Pirelli SL26 Tires
