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Post by oldgeek on Nov 6, 2019 18:49:16 GMT -5
I had most of the day off, so I had lots of fun with this scoot. Actually I had too much fun! I made it all the way to 64.9 mph but I got pulled over for speeding in the process. Once again I got sooooo LUCKY, no ticket just a warning.
Shortly after that happened, the CVT started acting up. It would not return to low gear very well and as a result the belt started slipping. I completely went through the new TFC rear pulley, cleaning all of the grease out and inspecting it. The inner seal had popped loose but there was no grease where it shouldn't be. I put a fresh stock spring in it, and put it all back together. Took another ride and it was fine for a while but then it started doing the same thing it was doing earlier. I am not sure what is going on with it.
Anyways I am tired of trying to get this tall geared transmission working right. I finally broke down and pulled the gearbox apart. It looked good inside, and the gear oil looked good enough too. So, I may hate myself later for doing it, but I pulled a stock set of gears from a spare set of cases and I am in the process of installing the stock gears in this gearbox.
And since I have the pipe off, I am going to try to braze up a small leak I found on the back of it.
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Post by repherence2 on Nov 6, 2019 20:11:24 GMT -5
Stock gearing! Wheelie machine!
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Post by oldgeek on Nov 7, 2019 0:24:18 GMT -5
All right, 10.65 stock gears are in, along with gear oil!
Took it for a quick spin and the Malossi kevlar belt was still slipping a bit, I dont know if it got contaminated or what. The RPM's were pretty steady at 10600 and I saw 52 mph on the short road, but I could not take it out on the longer road because they are still trying to get the roads paved out there.
I put the scoot back on the lift and switched back over to a stock Kymco belt, and increased the slider weight just a little. Took a ride and it was better. I dont think the belt is slipping any more. It needs some carb tuning and CVT tuning so it's gonna take some time to get it right.
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Post by oldgeek on Nov 7, 2019 21:54:01 GMT -5
Lots of CVT and carb tuning to do now that the I have the stock gears in it.
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Post by repherence2 on Nov 7, 2019 22:37:02 GMT -5
Im happy for you oldgeek. Seems like the bike is haulin' during certain portions of the video. Im assuming that's when you pull full throttle.
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Post by oldgeek on Nov 8, 2019 6:49:27 GMT -5
Im happy for you oldgeek. Seems like the bike is haulin' during certain portions of the video. Im assuming that's when you pull full throttle. Thanks! It is way out of tune and it is still a blast to ride. I will make another video to compare to the first one when I get a decent tune on it. The carb I can get tuned properly given enough time, the CVT will be the hard part. I really need to find a slightly longer belt for it. The stock belt rides about 1/4" low in the rear pulley, which is killing the launch. The malossi kevlar belt is slightly longer than stock, but it seems to be prone to slipping. The tall gears may have contributed to that problem so I will be giving the Malossi belt another try with the stock gears. I saw somewhere that kevlar belts may need a stiffer contra spring to help with slipping, but I am reluctant to go with anything much stiffer than a stock spring. Stiffer springs have never worked well for any of my builds, I think it has to do with the extra weight I carry. I saw 54 mph a couple times during the ride, and roughly measured 0 to 50 time at 14 seconds. I hope to squeeze a solid 60 out of this build. |
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Post by 90GTVert on Nov 8, 2019 9:41:38 GMT -5
I really need to find a slightly longer belt for it. The stock belt rides about 1/4" low in the rear pulley, which is killing the launch. The malossi kevlar belt is slightly longer than stock, but it seems to be prone to slipping. It may be what you're already doing, but look into belts for the bugeye Zumas. 738x18x28 is what you posted in your last setup info so you're close to their belts if that's not one. I know Polini makes a 750-16.8-30. Not sure what's out there nearer the 18mm width. I'd imagine some of the Zuma guys could tell you more. |
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Post by ryan_ott on Nov 8, 2019 10:43:55 GMT -5
I’ve got a collection of belts from my trial and error TP pulley search. I’ll get you some measurements and part numbers at some point this weekend. What width are you running now? Can you go wider or thinner?
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Post by oldgeek on Nov 8, 2019 21:58:48 GMT -5
OK, since I am unable to find specifications for the Kymco OEM belt, part # 23100-KCX-9000 I made careful measurements on a brand new one that I have. 727x17.5x30° The Malossi X belt Part # 6111153 published specs are *734x18.2x30° The malossi belt is pretty close to ideal, if it were 738 long and not a kevlar belt, I think it would be close to perfect. Edit: Well I guess it depends which Malossi chart you look at. Another chart lists it as 738x18x28° and says it is a kevlar belt not an X belt. I carefully measured my used Malossi belt and got 743x**x28° I tend to believe the second chart I looked at, at least about the angle of the belt that says the Malossi belt is 28 degrees. That might explain some of the slipping I was having. This is the OEM belt, setup with the belt fairly loose in the variator  |
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Post by oldgeek on Nov 9, 2019 11:03:13 GMT -5
I ordered the belt 90GTVert mentioned (Polini 750-16.8-30) It is the closest I could find so far to what I think I need.
I also broke down and got the mini rotor iggy they sell for the AF16, but I plan on using it for the 81cc build I am working on.
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Post by oldgeek on Nov 9, 2019 17:19:38 GMT -5
I’ve got a collection of belts from my trial and error TP pulley search. I’ll get you some measurements and part numbers at some point this weekend. What width are you running now? Can you go wider or thinner? I think anything between 16 and 18 should work for the width. Length is the kicker. OEM is 727x17.5x30 measured around the outside, and it rides over a 1/4" deep in the rear pulley. |
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Post by oldgeek on Nov 11, 2019 15:33:12 GMT -5
We are a bit slow at work and I am not on call this week so scooter work is in the forecast! Speaking of forecast, It ooks like today and tomorrow will be ourt last high 60's days for a while, its finally cooling off here. Since I cant do much with the CVT until the longer belt gets here I fiddled with the carb a bit. I made the needle 1 notch richer and adjusted the air screw. It really helped the low end, I should be real good when the longer belt comes in and the mid to top end is also much better. Top speed is currently 55mph and it sounds like something magical doing it @10900 on the tach! Temps are down for the most part, and I don't think it went over 325 coming off WOT. I am sure I sound silly talking about these scoots, but they are so much fun to blast around on! Especially when you built it yourself (with a little help from friends)  If tomorrows weather cooperates I will try to do a decent video. |
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Post by geoffh on Nov 11, 2019 16:12:49 GMT -5
I followed a link to a racing planet kevlar belt and was surprised to read in the blurb that some belt slip is expected until after warm up.
Geoff
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Post by oldgeek on Nov 11, 2019 17:16:17 GMT -5
I followed a link to a racing planet kevlar belt and was surprised to read in the blurb that some belt slip is expected until after warm up.Geoff I have seen that blurb myself. I have even seen somewhere that fitting a stiffer contra spring may be necessary when using a Kevlar belt. I have witnessed first hand the k belts slipping when cold. However I recently also saw my kevlar belt slipping even after warmed up. I believe it had to do with it being a 28 degree belt and 30 degree pulleys. |
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Post by pinkscoot on Nov 11, 2019 19:07:34 GMT -5
I am sure I sound silly talking about these scoots, but they are so much fun to blast around on! Especially when you built it yourself (with a little help from friends) I don't think you're alone with this. I find myself explaining what I did on my scoots and I see the eyes glaze over and stop myself. They just don't know what they are missing.  |
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