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Post by oldgeek on Aug 4, 2014 22:31:32 GMT -5
I decided that since I was tearing down the gearbox to look for the cause of the vibration, I might as well install the taller gears from a recently acquired triton motor in my scoot. After some cursing and sweat I got everything swapped out. The vibration is now gone, and the bog I had at launch is not as bad now as it was with the lower gearing. Anyone care to explain how that could be? I only got to do two quick passes on it, but I like it! I cant wait to work with the CVT tuning. Top speed with the low gears was around 53 mph and screaming! I wonder what I may get with the taller gearing? I am assuming the vibration was coming from the newly installed clutch input shaft. I just got a set of cheap V blocks so now I may try to check the clutch shaft and see what I can find. I gotta learn how to setup, and use a dial gauge first though.  |
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Post by oldgeek on Aug 6, 2014 22:18:03 GMT -5
I tried tuning up the CVT for the taller gears today, but I never was able to get it much better than top speed of 50, and a weak launch. Pretty much what I already had with the other gearing
I decided to do something I have wanted to do for a while now. I took the 21mm dell carb off and installed a 19mm dell clone.
I worked on it all day, and got it tuned up fairly well, but I still need to tweak something, I just don't know what.
I am currently at the following setup with the carb:
19mm dell clone carb with a stock airbox, snorkle removed, and 1 vent addded to the back.
96 main jet, 44 pilot jet, 40 slide, W7 needle second position from the top. The air screw is about 1/2 turn out from all the way in. I am going to go back to a 42 pilot jet, which will let me turn the airscrew out a bit more.
I rode quite a bit today and the 19mm dell seems to be a much better matched carb to this setup than the 21mm was. I also think fuel economy is going to be much better using the 19mm carb.
The CVT is really driving me nuts. I just cant seem to get the hang of tuning it up.
If I get the launch almost bearable, the top end suffers. I am using 4.5G sliders in the hoca variator, a modified stock fixed pulley half, a 1200 rpm contra spring with a BB base, and an adjustable pulley that is just set to the stock looking groove. If I shim the variator, top speed suffers, if I dont shim the variator, launch suffers.
The clutch is from autotech, and has red springs installed I think.
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Post by 2TDave on Aug 7, 2014 5:37:49 GMT -5
You might check to see if your starting to shift before the clutch engages. If so go down to 1.5 springs.
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Post by 90GTVert on Aug 7, 2014 9:19:49 GMT -5
Check on the clutch as Dave said and also try small increments with the variator shimming if you aren't already (0.5mm at a time).
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Post by oldgeek on Aug 7, 2014 10:21:06 GMT -5
Check on the clutch as Dave said and also try small increments with the variator shimming if you aren't already (0.5mm at a time). I will check again, but I am pretty sure its not shifting before the clutch engages. Its kinda hard to tell without a center stand though. As far as shimming the variator, I am using very thin shims, but it just does not seem to want to find a happy medium. I am hoping the 19mm carb will help make tuning the CVT a little easier. |
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Post by 2TDave on Aug 7, 2014 11:36:20 GMT -5
I sit on the scoot and rev until the clutch starts to pull while watching the rear pulley to see when it opens.
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Post by oldgeek on Aug 7, 2014 11:58:43 GMT -5
I sit on the scoot and rev until the clutch starts to pull while watching the rear pulley to see when it opens. Yup, I rev it on the work lift with the back tire strapped securely, until i see the clutch start grabbing. I have always had issues trying to get this CVT set up. I just cant seem to find it. I was beginning to think I was just expecting too much from it, until I put a Technigas pipe on the 70cc VINO. I got that setup hooked up well without much trouble. |
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Post by oldgeek on Oct 4, 2014 19:43:38 GMT -5
I decided to put the large old technigas pipe I recently fixed on my 70cc scoot. I have never run the pipe before, and it is HUGE compared to the Next-R. It is such a pain in the arse to get a pipe installed! I could not find the bracket that I got with the pipe, so I modified the homebrew bracket from the Next-R pipe that was already on the scoot. It took about three hours to get the bracket modified, the flange slotted, and the mount on the pipe tweaked.
I took it for a ride without doing anything to the carb. I can tell it is lean all through the middle, so I put the choke on just to be safe. Top end is not really any better, but I can hit 10000 RPM's again. Also this pipe seems to hit a bit harder than the next-R did. I believe my durations on this setup are a bit mild for this pipe, or any pipe for that matter.
I rode by the scooter shop, and they were about close and go on a scooter ride, so I tagged along. There were 10 scooters in all, and I had the only 2T! We rode the boulevard along with all the Harleys that are here for fall bike week. We had a blast, and thanks to what I have learned from this forum, I easily dominated all the other scooters. Top speed for this setup so far is 54.5 mhp.
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Post by Corrosion on Oct 4, 2014 20:52:26 GMT -5
Check and see if the Bearing base, is allowing the Rear Pulley to open all the way.
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Post by 2TDave on Oct 4, 2014 20:56:14 GMT -5
Sounds like a good day! What Technigas pipe is it?
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Post by oldgeek on Oct 4, 2014 21:26:09 GMT -5
Check and see if the Bearing base, is allowing the Rear Pulley to open all the way. It is. I recently installed the stiffest short, stock contra spring I had, on the BB base, and I checked to make sure it was opening completely at that time. I also cleaned up and greased the pulley, and moved the pins to the first set of straight grooves. So far this is a pretty good setup. |
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Post by oldgeek on Oct 4, 2014 21:35:21 GMT -5
Sounds like a good day! What Technigas pipe is it? I do not have a clue what pipe this is. This is how it looked when I got it. The PO had it on the stock 50cc Vino! Notice in the picture the notch melted into the bottom of the blinker from the pipe, and the cable ties they added to hold the blinker off of the pipe!  |
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Post by oldgeek on Oct 4, 2014 21:41:19 GMT -5
Found this picture of the pipe next to the Technigas Next-R  |
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Post by niz76 on Oct 5, 2014 2:46:45 GMT -5
That baby is huge!
Not sure if you've already done it, but have you tried filing the faces of the variator? This helped me to get the belt all the way down onto the boss for good launch while using less shims and also lets the faces close together more for better top end.
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Post by 2TDave on Oct 5, 2014 6:07:36 GMT -5
Looks like the RS. They make a 100cc model, could be it.
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