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Post by honda4life on Nov 16, 2017 12:35:24 GMT -5
Ok.
2009 Zuma 2 stroke
Rider weight-135lbs
S6carb, stock variator and stock belt, throttle mod done as well. Stock air box with uni filter. Tecnigas silent pro, stock contra.
Jetting feels really good-smooth power and all the way up to wot.
Went out today and did some runs (trying to increase rpm's some for more top speed)
Put in stage 6 (40gm total) weights=41mph @ 8000rpm max
Stage 6 (30gm total) weights=42mph @ 8000rpm max
I did the sharpie on the variator and I still have 1/4" more room on the variator at top speed.
Why can I get the belt to go up higher on the variator and a higher top speed? Is it that my motor can't push the belt up higher because of the contra spring? Should I get a stiffer contra?
Confused at this point??! Haha
I was thinking that lowering the weights would increase my rpm's and increase my top speed. Didn't work?!
I did notice that it accelerated faster and was more peppy with the lighter weights though but I can't get it over 8000rpms?
What should I do next?
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Rune 75
Scoot Enthusiast
Posts: 441
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Post by Rune 75 on Nov 16, 2017 13:09:44 GMT -5
How many miles on your belt ? As it wears it gets narrower and won't climb as high as a new belt. An you loose top speed.
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Post by spaz12 on Nov 16, 2017 15:26:31 GMT -5
A stiffer contra spring would make it even harder for the belt to travel all the way.
Do you have the little washer between the outside pulley and the drive boss?
Is this a stock bore, or a 70?
42 mph would be good for a stock bore on that super heavy scoot.
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Post by geoffh on Nov 16, 2017 16:24:16 GMT -5
Honda,I think the next step is Hi speed variator,I fitted a polini to my stock jogR and got a few MPH top end.
geoff
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Post by honda4life on Nov 16, 2017 19:01:14 GMT -5
Stock bore, 600 miles on scooter. I have the washer on the boss out now but didn’t seem to make much difference.
I was determined to do 45 with my skinny ass.
Why isn’t the belt being pushed all the way up on the
Variator?
What would the peak power band be on this motor?
I was planning on moving the rpms up to like 8700-9000 but I can’t even REACH that rpm. Wonder why?
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Post by 'O'Verse on Nov 16, 2017 20:53:40 GMT -5
8000 rpms on a stock jug is decent. Normally with a 1/4 left on your variator. You'd want to up your roller weights to push your belt higher threw weight momentum. According to your two test drives your rpms stayed the same at 8000. Which is a good indication that rpms might be limited or restricted. Variator ring, CDI, exhaust, or belt length restriction. Lighter roller weights usually will raise your rpms enough to be noticeable via your gauge. Heavier weights usually lower rpms. What rpm gauge are you currently running?
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Post by honda4life on Nov 16, 2017 20:58:40 GMT -5
Tiny tach.
The Zuma does seem to be a bit top heavy-not as nimble as my Kymco. But I love the 2 stroke!!! Haha
I can’t remember what weights I ran in my ruckus with a scooter ninja variation but I think it was 4.5-5gm weights and I had it running 55mph on the stock get motor!
Just thought I could get some more mph out of the 2 smoker.
Like I said I only weigh 130 so it shouldn’t take much to get me rollin’
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Post by repherence2 on Nov 17, 2017 20:43:35 GMT -5
It could have something to do with the variator drive boss length. Like you, I kept trying to get a higher top speed. I fiddled with all sorts of roller weights (3.2g to 7.0g), contra springs (NCY black, yellow, and red), clutch springs and all.
One day I went to the moped shop to buy some used drive bosses. I walked out of the shop having purchased 3 bosses, all 3 were different lengths. Just by looking at them, you would assume that they are the same length. But, I stood up all 3 bosses and noticed that all 3 stood at different heights.
I tested all 3 bosses and found that the shortest boss gave me the top speed I was looking for. You do sacrifice your launch/takeoff speed though.
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Post by honda4life on Nov 18, 2017 15:50:45 GMT -5
Agreed. That was the theory behind removing the washer. Shorter boss lets the belt start higher on the variator and higher travel but less takeoff power.
Getting too cold now to mess with it. Next warm day I’ll have to fiddle with it.
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Post by pinkscoot on Nov 18, 2017 17:10:50 GMT -5
Something I do is take the 2 faces and hold them together with the belt between them to see if the belt will even travel to the top. You can also check if the boss is the right size by balancing everything with the belt in it to see if the varaitor opens and closes enough to allow full travel. On the stock variator on the Pink Scoot the variator doesn't have enough travel to allow the faces to close enough to bet the belt to the top. A shorter boss would help but you loose the starting acceleration.
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Post by honda4life on Nov 18, 2017 19:04:22 GMT -5
Interesting suggestion. Never even thought of that!!
I’ll check it out tomorrow and see.
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Post by repherence2 on Nov 20, 2017 21:51:27 GMT -5
what size belt is in there now? is it a 788 like the china 2 strokes? my Ningbo gtx came with a 788. however, the "Yamaha" 90cc engine I bought from a Chinese moped shop came with a 16.6 797 mitsuboshi belt. I currently run the 797 but I keep a 788 as a spare in the seat compartment. I don't use "stock" variators anymore either. Moped shops here on Oahu sell Keli variators for Jogs and Dios. it has longer roller ramps than stock units and I am pretty sure it increases top speed because the variator can close further, making the belt go higher on the pulley. The Keli variators are not that expensive either. it comes with ramp plate, guides, a set of roller weights too. I don't recall if it comes with a drive boss.
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Post by honda4life on Nov 22, 2017 23:42:19 GMT -5
Thanks buddy!! I’ll search for that brand name....never heard of it.
I’ve heard of “Koso”....sure it isn’t Koso?
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Post by ThaiGyro on Nov 23, 2017 6:40:56 GMT -5
Moped shops here on Oahu sell Keli variators for Jogs and Dios. it has longer roller ramps than stock units and I am pretty sure it increases top speed because the variator can close further, making the belt go higher on the pulley. The Keli variators are not that expensive either. it comes with ramp plate, guides, a set of roller weights too. I don't recall if it comes with a drive boss. Hey repherence2, I am very interested also...tried to look up "Keli"...found Moped Doctors web page, but no parts, just services. We are doing Honda Gyro engines and Dios here in Thailand. The description you give could be what we are looking for. Is it over sized or OEM dimension? Could be a good find! Jay |
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Post by repherence2 on Nov 23, 2017 11:46:35 GMT -5
Moped shops here on Oahu sell Keli variators for Jogs and Dios. it has longer roller ramps than stock units and I am pretty sure it increases top speed because the variator can close further, making the belt go higher on the pulley. The Keli variators are not that expensive either. it comes with ramp plate, guides, a set of roller weights too. I don't recall if it comes with a drive boss. Hey repherence2, I am very interested also...tried to look up "Keli"...found Moped Doctors web page, but no parts, just services. We are doing Honda Gyro engines and Dios here in Thailand. The description you give could be what we are looking for. Is it over sized or OEM dimension? Could be a good find! Jay The keli units are pretty much stock dimensions as far as the belt face of the variator. But if you flip it over and look at the roller ramps, you can see the difference over stock. The ramp is longer and they extend out further than stock at the outter rim, the ramp is taller than stock at the outter edge. |
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