SA50 looking for 45 mph and decent takeoff

[mwilliamshs]

Greetings! I've already researched this quite a bit and done lots of math so if you have input as to engine building or any gears other than the 15/42 secondary set that yield a 9.8:1 final, please post that over here.

I have a 98 Elite SR that's completely stock and running well. I enjoy it and ride daily to work, school, running errands, etc. I live in a hilly area and ride on streets with speed limits up to 45 mph.

I'd like to be able to ride closer to 45 mph. I do NOT want to make any modifications that aren't necessary to achieve this goal. No big bore kit, no attention grabbing exhaust, and I want to keep using the stock oil injection system.

My plan is to install the 15/42 gears. I know this will hurt my hill climbing ability and cause slower takeoffs. I'll compensate for those negatives by modifying the variator to stay in a "lower gear" longer (lighter rollers) and the clutch (via contra spring) to stay in a lower gear longer and "downshift" sooner so I don't slow down excessively on hills. I'll either swap ramp plates or variators too. Probably plates at first and variators later if I still want more oomph.

Anybody got a suggestion on roller weights and contra spring to suit the 9.8 gears in a stock scoot with ~210 lbs on board? Any comparison of aftermarket ramp plates on stock variators?

THANKS IN ADVANCE

[mwilliamshs]

THANKS for the info, codename47!

...id do 1000rpm springs in the clutch, but im lighter too, like 140. so. dont kow for sure but i think itd work...id go with both 1000 rpm grabbers, and 1000 rpm contra. maybe if you, want get 1000 grabbers and 1500 contra...

Would a heavier rider such as myself benefit from say 500 or 1,500 rpm springs, versus the 1,000 you suspect to match your 140 lbs? (heavier weight = higher or lower rpm?)

...youd just need to work on the roller weights...id try to get a cheap set for practicing until you found what you needed for sure then maybe buy quailty on your roller weights. thats what i pretty much did. youll need 6,7,8 gram weights. they amke this practice set, but its really cheap and will tear up if you forget about them and take yoru variaotr out with them. once they melt and flip sideways in your variator. erm. so, i always just bought the cheapest weights in what i thought id need, some cheap brand, koso, in the weight area id think id be in then tune from there. remember you can swap half and half's. but dont mix up what weights they are if there not color coded, or labeled, by brand or something. might need scales...

What's a good brand of rollers? I've read "Daytona is the best" but can't find them for sale anywhere. This might be a good thread of its own, "Which are good brands and which are cheap junk?" because when they're all foreign and all sold by multiple vendors it's tough for a newcomer to sift wheat from chaff.

For rollers specifically would it go: Daytona > Dr Pulley > OKO > Koso? Are there other major players I've left out?

...an aftermarket variator would be better than a just ramp plate, cause youll want to lighten your transmission, drive side as much as you can. for higher rpms, better acceleration which lets you gear higher, easier.

I really just want to eliminate the high-end limits of the stock variator/plate and I've read and believe they're in the plate's outer edges so replacing that should raise my mph ceiling. That shouldn't even be necessary to achieve my goals as the calculations show I should be capable of over 43 mph just with the gear swap and nothing else. I'm really not overly concerned with acceleration; I expect it to be slightly worse than stock I just want it to be safe and not need a mile to get up to 25 mph. I know that'll require lighter rollers than stock to keep the CVT from getting out of low gear too soon. I know I won't be racing right up to 45 mph. I just want to have a higher potential speed than stock. Higher rpms and gearing higher (numberically lower, i.e. 9.8 vs 12.12) don't work together. I get that a higher "launch rpm" would put you nearer the peak power rpm at takeoff but that'll just wear the clutch more and I'd rather leave the clutch alone if possible, except the contra spring which isn't impacting clutch engagement, just pulley geometry.

Thanks again!

[Cmoped9]

I've got a 2000 SR, completely stock, put a variator in it, top speed was about 38ish acceleration was amazing, wheelies all the time. I wanted more speed like you, so I installed new 9.8:1 gears yesterday, my top speed increased to around 43-45 according to my gps and depending what way the wind was blowing. Acceleration wasn't terrible, still got up to speed pretty good.

[mwilliamshs]

...2000 SR, completely stock, put a variator in it...

Which variator? What weights?

...top speed was about 38ish acceleration was amazing, wheelies all the time...

Gosh that must've added quite a lot of low-end. I want a scoot anyone can get on and ride without wheelies.

...I wanted more speed like you, so I installed new 9.8:1 gears yesterday, my top speed increased to around 43-45 according to my gps and depending what way the wind was blowing. Acceleration wasn't terrible, still got up to speed pretty good.

Sounds perfect!!! Did you make any clutch/driven face changes?

What variator, what weights?

Thanks for posting! Exactly what I want, 43-45 mph and decent acceleration.

[mwilliamshs]

variators...The stock ones are aluminum/steel, so are aftermarket ones. A malossi, or polini will suit you just fine...

Cool.

...Gears and a variator will put you at 47-51 top speed, cruising nicely at 40-45. A vari kit by itself, should put you around 42-45 top speed...

Right.

...at that weight you will be in the 6.5-7.5 g range...

My weight (210) or the variator weight or uhm...something else?

...Polini vari's come with two sets of rollers, malossi is just one set...

What weight are the included rollers?

[mwilliamshs]

thanks for the info!

[xxgamerxx]

or if you can find a 14x34 gear it wont hurt ur acceleration i can still pop a wheelie with a decent tops of 80kph primary gear is on 12x42 658 dio 3 belt overrange torque drive stock clutch 1krpm clutch 1.5krpm center. here is the image of the 14x34 gear.

[maddog]

You can get the large japan dio rear pulley, shave the case bolts, use the stock belt for better take off or use the dio belt for more speed.

[1man8scoots]

Do not ever ever ever shave your case bolts. Why would you? Freaking idiot.

[maddog]

Did you just call me an idiot, I want you banned for 30 days, lets go admin kidz start doing your job