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Post by christopher on Aug 28, 2019 15:06:16 GMT -5
Installed a Tecnigas exhaust pipe and an 80 main jet today. Really feels like I need to raise the shift point, feels like to wants to take off, then bogs down at 6000RPM right after I feel something like a shift. Acceleration is slow to about 7000RPM, then scooter starts to accelerate a lot better then before pipe install. I can hit 9500RPM and 40 MPH GPS speed now. Prior to pipe change it was hard to get to 35MPH and 8900 RPM. Looking at graphs for the pipe the sweet spot is about 8500RPM.
Going to start doing some research on CVT tuning, need to figure out how to raise the running RPMs to about 8500 from 6000. Thinking lighter weights would be a good start, will have to take mine apart to weigh what is in there and get dimensions. Suggestions on changes and references to watch or read would be appreciated.
Took it apart and there are 6 roller weights 5.1 grams each, diameter is 15mm width is 12 mm. Also still.has the restrictor spacer or washer in place. Going to leave it don't care about going any faster.
Don't think I can really tune the main jet etc until I can accelerate and get a good plug reading. Another interesting side note is I now have a bit of blue smoke, didn't have that before. Looked in the old two piece exhaust previously and didn't see any restrictions,also split it and looked in the muffler section and it was just an open chamber with something at the end. Didn't see any catalytic converter material.
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Post by repherence2 on Aug 28, 2019 21:23:12 GMT -5
you should try lighter weights.
I tune main jetting by cylinder head temperature. seems easier to me. I don't feel like dealing with running the bike, turning it off, and then pulling a plug to inspect it. Ever since I was told to just tune WOT so that it runs at 350F or less and you're good on the main jet, I have tuned via temperature. having a temp gage allows you to monitor temps when going from Full throttle to No throttle, depending on the jetting you may see the temperature spike way over 350F.
sounds like you have a rear pulley with dual angle slots. might be better off with single angle slots. you can buy rear pulley sheaves that have 2 sets of slots cut to different angles.
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Post by christopher on Aug 29, 2019 5:22:15 GMT -5
Ordered a set of 4.5 and 3.5 grams DR.Pulley sliders. Rollers had flat spots at 1000 miles. Wanted to try sliders figured it is an excuse. I can get a few combinations that way. If I need heavier sliders for some reason I can add weight to the centers. My current rollers at 5 grams have a thin metal wall, thought about drilling to experiment just not much to work with.
I will have to look at the rear pulley slot hadn't thought about that, haven't taken it apart yet. Any recommendations on something to get?
Trying to change one thing at a time, the exhaust change isn't allowing that. I have seen that some exhaust kits come with lighter 4g rollers. I guess that should have told me something.
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Post by oldgeek on Aug 29, 2019 5:41:48 GMT -5
If you are not looking for more top speed, you should have kept your stock pipe. The expansion pipe you installed robs your low end torque but pays you back double on the top end. To help alleviate your acceleration problems you can install stiffer clutch springs and possibly lighten your clutch. Then your clutch will grab later and at a higher RPM, where your new pipe works better.
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Post by christopher on Aug 29, 2019 5:55:16 GMT -5
If you are not looking for more top speed, you should have kept your stock pipe. The expansion pipe you installed robs your low end torque but pays you back double on the top end. To help alleviate your acceleration problems you can install stiffer clutch springs and possibly lighten your clutch. Then your clutch will grab later and at a higher RPM, where your new pipe works better. I agree there are better alternatives for an exhaust with lower end torque. I like to tinker and have never had a 2T scooter. It is a learning experience for me. It is kind of neat to feel the power band of the pipe kick in. Also a lot cheaper than Indian motorcycle parts.
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Post by geoffh on Aug 29, 2019 15:06:24 GMT -5
OK I am just asking how thick is the restrictor washer and where does it fit.
Geoff
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Post by christopher on Aug 29, 2019 17:04:01 GMT -5
OK I am just asking how thick is the restrictor washer and where does it fit. Geoff I didn't measure the thickness, it's located between the two halves of the variator surfaces where the belt rides.
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Post by aeroxbud on Aug 30, 2019 14:34:35 GMT -5
I would still remove the variator restriction. Even if you don't want more speed. It will stop the engine having to rev so high. Much kinder to it.
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Post by geoffh on Aug 30, 2019 14:55:04 GMT -5
I would still remove the variator restriction. Even if you don't want more speed. It will stop the engine having to rev so high. Much kinder to it. If you remove the washer and don't,t like it you can always put back. Geoff
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Post by christopher on Aug 30, 2019 16:31:21 GMT -5
I agree I can remove it, don’t want to change a bunch at once. Already have issues with low RPM, don’t want to make it worse at the moment.
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Post by aeroxbud on Aug 31, 2019 0:20:09 GMT -5
Removing the restriction in the variator will just put it back to how it was designed to work. It won't affect anything else, apart from top speed.
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love2ride1111
Scoot Enthusiast
Posts: 222
Location: Indian Rocks Beach Florida
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Post by love2ride1111 on Sept 1, 2019 11:26:24 GMT -5
Did you check to see if new pipe has welded in restriction washer.?
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Post by christopher on Sept 1, 2019 13:01:52 GMT -5
Did you check to see if new pipe has welded in restriction washer.? It’s gone, didn’t really look like it ever had one, welds were clean. Really feels like it is shifting to soon. Once I get a lighter set of weights I’ll see what happens.
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mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
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Post by mattyslimz on Sept 2, 2019 0:52:47 GMT -5
A useful tool in doing any type of roller weight tuning is the Prima roller weight tuning kit (in 15x12 size). It comes with 1g all the way to 12g. You can test out, mix and match stagger weights to get the perfect tune. It’ll save you money in the long run. I’ve used mine quite a bit. I wouldn’t leave them in long though as I’ve noticed they will flat-spot more quickly than a permanent set.
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Post by christopher on Sept 24, 2019 5:51:39 GMT -5
Finally got a chance to try the DR Pulley sliders, 4.5 grams sliders works better then the 5.0 grams rollers. Tried 4.0 grams sliders and I had the fastest 0-30 and 0-35 MPH times so far. Had a 0-30 run of 6.9 seconds fastest so far, 0-35 time averaging 10.01 seconds.
I want to try a straight slot in the clutch, the two stage transition angle bothers me seems like it is taking the rpm out of ideal. The 4 gram weights are revving higher so it masks it more.
Maybe stiffer clutch or contra spring also next.
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