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Post by Zino on May 27, 2020 8:09:02 GMT -5
At rest without the scooter running how much room in mm is left on your rear pulley ?
And with the Sharpie how much is left on the front pulley ?
The Belt that came with that kit should be perfect.
With all the problems adjusting this high overrange kit .
It Must have been made on Friday after the Technicians went on a extended lunch .
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Post by Kenho21 on May 27, 2020 8:22:21 GMT -5
There's a pic a couple posts back of the rear pulley and front pulley belt travel and I haven't measured it, but it's a lot leftover in the rear and maybe 3-4mm up front.
I know there's a lot of power and top end left on the table that I can get with a proper CVT tune.
And yeah, that's just my luck with things I suppose. I do have another brand new over range belt. Maybe I'll see if that one is any better, but it is supposed to be the same belt.
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Post by Kenho21 on May 27, 2020 8:24:16 GMT -5
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Post by Zino on May 27, 2020 17:15:26 GMT -5
That belt looks way short .
Possibly 10-15 mm short .
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Post by Kenho21 on May 27, 2020 17:43:39 GMT -5
That belt looks way short . Possibly 10-15 mm short . I’m topping out at around 47-49mph. Do you think that lack of mm in belt length could be costing me that much speed? |
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Post by Zino on May 27, 2020 18:07:19 GMT -5
3-5 mph is what I would guess .
99 mm pulley and your using 91 -93 mm only
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Post by Kenho21 on May 27, 2020 20:44:46 GMT -5
I wonder if my contra spring is binding or something too... something is definitely wrong. Even with another few mm of travel on the pulley, I'll still be wasting a ton of rpm.
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Post by Zino on May 28, 2020 0:00:03 GMT -5
11k rpms on my vino stock gears I would be close to 60 .
11k on my zuma with the 11 to 1 gears would have me past 60 .
Does your 0 to 40 feel like your Jog or way slower .
Just trying to work through the chain of power .
You should have a very Torquey setup with the athena with polini head
You have a ton of Rpms but the real wheel is only pushing you to 50 .
Just Screams you are losing in the Transmission.
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Post by Kenho21 on May 28, 2020 6:43:01 GMT -5
Yeah, that’s basically exactly what I’m experiencing Zino. It pulls hard and gets up to 40mph very quickly, then the rpms just start climbing very quickly and 49mph is top speed. Even going down a steep downhill, I think the fastest speed I’ve seen was 51mph.
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Post by Kenho21 on May 28, 2020 6:43:42 GMT -5
0-40mph is even faster than the Jog for sure.
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Post by Kenho21 on May 29, 2020 7:44:54 GMT -5
So, I must've been mistaken regarding my setup and slow speeds because I was going off of memory and hadn't opened my CVT in a couple days. I had made changes here and there to the CVT, but was mainly in "carb tuning mode" and taking notes on that and not my CVT tune. Carb is tuned and my attention is on the CVT now and I'm taking notes though. When I opened it, I had a TON of leftover pulley travel to go. 8+mm to be exact.  I had been using one of those spring seats that Polini includes with their contra springs and I think that was causing binding. I previously thought all of the binding was coming from pulley/clutch contact, but that must've only been part of the problem. I removed the spring seat and dropped from 6gr to 5gr rollers with a 0.42mm bushing shim and I had about 1mm of marker left on the pulley. (sorry for the camera flash, the sun had went down). I was seeing 57mph @10,500rpm  I'm going to keep playing around with it. I really want to be able to get her up to 60mph. That's important to me for some reason haha. One question: What is the optimal amount of marker left on the variator? It seems like I would want just enough travel to use up the entire surface of the variator for top speed, correct? |
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Post by 90GTVert on May 29, 2020 19:43:53 GMT -5
Ideally you'd use every bit of the variator surface, but if you look at the drive face you'll probably find a bevel at the edge so if you mark over that area you'll always think there's a little bit left. Looks like you're doing quite well with the travel to me. Maybe play around with the weights a little more to see if you can squeeze out that last 3MPH.
I don't know why you're having such a hard time with this. Stock 139QMBs do 60MPH with just a mixture screw adjustment and an orange racing CDI.
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Post by Kenho21 on May 29, 2020 20:03:05 GMT -5
Ideally you'd use every bit of the variator surface, but if you look at the drive face you'll probably find a bevel at the edge so if you mark over that area you'll always think there's a little bit left. Looks like you're doing quite well with the travel to me. Maybe play around with the weights a little more to see if you can squeeze out that last 3MPH. I don't know why you're having such a hard time with this. Stock 139QMBs do 60MPH with just a mixture screw adjustment and an orange racing CDI. Yeah, it was hard to tell if I was over the edge with the marker or still have a mm left. I check it out tomorrow. Feels good to have the carb tuned well and getting real close with the CVT. I'm glad you've finally come to your senses and started listening to the comments on Youtube. And I knew you guys have been holding out on me! I've had the blue CDI this whole time. Of all the money I've poured into this build, that's where I cut corners. Heading over to wemakeyourscootersuperfastandreallypromisenottoripyouoffthistime.china.com to place my order now! I'm going to get the orange CDI and cut the 4 stroke wire so it will work on my 40QMB. |
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Post by Zino on May 30, 2020 0:10:57 GMT -5
Good to here your getting better speeds .
That sounds closer to a speed to build off with your set up.
As your Kit Loosens up you should pick up a couple miles .
I shoot for 2mm or Less on the regular Multi Var Variator but it does have a visible bevel around 2mm
The Overrange picture looks like you have next to no Bevel from your Camera angle
Your Cvt Tuning was a Big Victory .
Cleaning up 7 mm of travel = 8 miles more per hour
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Post by Kenho21 on May 30, 2020 7:14:26 GMT -5
Yeah, I was pretty happy when it felt like it was all of the sudden just working properly. You never know when you start out on a problem if it's going to be one of those that seems to get fixed little by little and you're never sure if it's fully fixed or one of those problems that needs just one tweak and then you're on your way. I'm glad this turned out to be the latter.
I'm thinking 60mph should be achievable. Honestly, I thought I'd be doing 60+, but I have zero experience with full builds like this on a heavy framed Zuma, so I
m sure my expectations are a bit off.
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