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Post by wiscootsin on Sept 30, 2019 16:31:38 GMT -5
so I’ve been buying up the parts I need on eBay and have this thing running now! Once I got the stock air box on it kicked right up. The first mile or so was a smoke bomb behind me but it cleared up.
I put new tires on it and that was some work...thing was used as a dirt bike, had a cut up tire inside in addition to two inner tubes, but anyway.
im curious about the CVT setup. At full throttle to start out it immediately goes to around 7600rpm and smoothly accelerates all the way to about 39mph. It’s a very smooth ride. Is this stock? Is that typical? I haven’t opened the transmission yet as I wanted to see how it all would run before I mess with it.
It doesn’t have much bite on takeoff either so I’m wondering if the clutch could be worn? Or is it just a sweet smooth rider as stock?
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Post by tiny on Sept 30, 2019 16:48:21 GMT -5
The odometer on most smaller KYMCOs are 10% faster then your true speed.
The CVT sounds like bib played with a bit as mine had good acceleration til 6200rpm then bogged down til 7100rpm then took iff lije hell but i wasn't done tuning yet.
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Post by olderdan on Oct 1, 2019 7:01:45 GMT -5
I thought just the Speedo was a usual suspect but the odometer was accurate?
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Rune 75
Scoot Enthusiast
Posts: 441
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Post by Rune 75 on Oct 1, 2019 8:33:36 GMT -5
I thought just the Speedo was a usual suspect but the odometer was accurate? That's usually the case. Odo is mechanically driven, speedo is magnetic. |
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Post by GrumpyUnk on Oct 13, 2019 11:48:14 GMT -5
I would take a close look at the belt. Likely it is all shiny smooth from wear, and a bit narrower than original dimension.
I have a S 9 that got replacement rings(by me) and I've had some difficulties. It accelerates with noticeably more power than 4T 50cc machines. Problem was it seems to run out of fuel, so there has been no opportunity to see what it does over 5k rpms.(maybe 7?)
It revs fine with the wheel off the ground, and is VERY finicky to throttle when not loaded, finding a sweet spot where it just wants to rev( yeah, got to the 10k range and a cloud of smoke).
I am running 40:1 mix, and I think the injector is also working.
It has a belt that has seem some km, and is shiny on the sides, it also has the top 'edge/corner' of the belt turned up, as if the sides are worn, but the belt across the top has kept some of its width.
My deduct is that a new belt would be a 'good idea'.
Either way, it should sort of 'wake up' power wise when it gets over 7k. At least I think so. That with factory standard muffler/exhaust, and the stock 39mm bore(I think). I *think* you should be able to exceed 7k no problem and it should pull higher than that. You may be getting slippage at takeoff.
If you fire it up w/o the exhaust being connected, it sounds like a chainsaw on steroids. It does seem harder to start with the exhaust disconnected.
tom
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Post by wiscootsin on Oct 20, 2019 15:12:54 GMT -5
Got into the CVT today. belt was at 16.8 mm which seems ok. service manual says replace if under 17 but i'm guessing thats just the stock width.
Found the culprit though! There were only 4 roller weights in it (of the 6). And the 6 spots are not symettrical to each other so i feel like that could have some weird consequences. The 4 were 9mm, which i'm guessing is stock. Maybe the previous guy thought he'd "increase acceleration by reducing roller weights" by removing two instead of putting lower weights in there...
I first put on some 7mm sliders but it was too slow. On a speed run it went up to over 10k (downhill) and was probably only at 36ish mph (cant' tell since my speedometer is so far off).
The only heavier weights i have are for a tuner set so put the tuning 9mm in it. I'll be needing to buy some rollers or sliders.
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Post by tiny on Oct 20, 2019 17:35:11 GMT -5
Stock roller weight on a Super9 is 8.5 grams. Before i sold my S9 i had the rollers setup at 3x8.5g and 3x9.0g. That seemed to work best for me.
It was great on flats, slight uphill and downhill but was still struggled up steap hills which there are plenty of in my area.
My top speed on the flats was in around 80KPH so 49-50MPH.
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Post by GrumpyUnk on Oct 21, 2019 11:51:44 GMT -5
If the belt is not up to spec width-wise, you end up changing the 'gear ratios' because the belt will neither climb as high on the variator and thus not go as low on the torque drive. It is the same as running a different belt with a longer length, and if 'burnished' will slip more than a new fresh belt. You really can't ignore the wear without consequence. If worn out of tolerance, it doesn't make much sense to me to do any tuning of the rollers/sliders, nor anything else.
Heavier weights will just cause the variator to force 'upshifts' to occur earlier. Lighter weight will allow the engine to rev a bit more before the variator starts to change the gear ratio, it will be slower to 'upshift'.
At least that is my understanding.
BTW, what size belt is installed?
tom
Actually, I think 7600 rpms is on the lower end of 2T performance. The LC will readily rev to 10k rpms, though I don't like to take it there.
tom
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Post by wiscootsin on Oct 21, 2019 22:50:40 GMT -5
yeah i'm planning to replace the belt but need to decided whether to do the stock one or try a longer one. It has a stock belt, kymco bando keb7-9000 which is a 737-18-30 belt. worn down to 16.8mm. with 9g tuners it has good acceleration and tops at 42/43mph.
I'm wondering if anyone has any belt suggestions or if i should stay stock.
I'm going to look into getting a different exhaust. The stock one on has some damage (dented in).
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Post by christopher on Oct 23, 2019 5:41:40 GMT -5
I've been experimenting with belts, all I can say is if you plan on doing any experimenting purchase a brand that offers longer or shorter belts close to what you need. I only wanted to add a few millimeters to get me to the edges of my pulleys, Gates for instance offers a 788 and 805. These companies are not measuring belts the same and I have a 796 Malossi belt that is shorter than a Bando 788.
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Post by dexameth on Oct 23, 2019 14:19:09 GMT -5
I've been experimenting with belts, all I can say is if you plan on doing any experimenting purchase a brand that offers longer or shorter belts close to what you need. I only wanted to add a few millimeters to get me to the edges of my pulleys, Gates for instance offers a 788 and 805. These companies are not measuring belts the same and I have a 796 Malossi belt that is shorter than a Bando 788. Exactly... the Malossi long-case 139QMB belt(calls for 729x18x30) is marketed as a 743x18x30. Weird. I run the Bando 738x18x30 with some of my CVT setups, helps with take off for sure! |
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