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Post by dexameth on Sept 13, 2016 13:18:08 GMT -5
So I have a blue 1k, a stock (1.25k?) and a yellow 1.5k contra spring in my collection. Every time I install the yellow contra spring I can not, for the life of me, get the clutch open to drop the belt in. So frustrating!! I want to tune my CVT with this spring badly.
Does anyone have any tricks or tips or hints or voodoo to easily open the clutch?
How the hell does one do the red 2k spring?!
The three clutch springs are easy, it's the one main torque spring I'm wrestling.
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Post by Cincikid on Sept 13, 2016 13:36:45 GMT -5
Once the clutch is back together and installed on the bike, place the belt on the top half of the clutch letting it hang. Grab hold of the belt about 2 inches below the clutch and pull down hard. The clutch should open and belt should slide into place. Sometimes it takes a couple of hard tugs. You can do it the same way using the variator shaft. W/out the variator on loop the belt on the back half or the clutch slide the front half over the variator shaft then press down on the middle of the belt. Either way you're going to have to use your man hands.. try gloves if you have a hard time gripping.
Someone may have a better method but that's how i do it. ( When pulling open method fails )
Good luck.
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Post by 90GTVert on Sept 13, 2016 14:03:29 GMT -5
Wrap the belt around the rear pulley. Grab the pulley with both hands to open it, keeping the belt handy as best you can. Use a thumb or finger or helper to push the belt down in the open pulley so that it stays open. Sometimes the pulley is hard to grab for the cases, and you can take the whole pulley off and get the belt in there, then put the belt over and into the vari and install the rear pulley. Might have to get creative, or get one of these....  |
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Post by gsx600racer on Sept 13, 2016 14:56:08 GMT -5
Iv found if you hold the rear pulley with both hands on each side and place the belt over the top, then get your fingers in between the pulley and squeeze with all you got to open them and and let the belt drop in.
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Post by dexameth on Sept 13, 2016 16:33:11 GMT -5
I must have weak little fingers  I normally loop the belt around my wrist, and then once I can pull the clutch open I hold it with the hand the belt is on and slip it down and onto the pulleys. The yellow spring closes it almost instantly, it's SO hard to hold one-handed. I've tried it both one the case and off. I guess I'll have to get creative. |
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Post by Cincikid on Sept 13, 2016 16:56:34 GMT -5
Yeah, it isn't easy. Try the 2k. I was close to throwing that thing across the yard! Try the looping on variator shaft and back of clutch method. It gives you a leverage you cant get with just hand strength.
Or maybe you could run a rope or something through the belt and tie it off to something stationary ok then run some kind of pipe through the clutch at that point you could pull back using your weight and arm strength. once the belt is in position just pinch the belt tight to the clutch till you get it back on the shaft and the belt over the variator boss. Now that's a good idea!
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Post by oldgeek on Sept 13, 2016 17:26:42 GMT -5
I install the vari and torque it on correctly. Then I loop the belt over the vari and let the belt hang down. I take the clutch in both hands and put the belt in the pulley groove. I push the clutch down and to the rear of the scoot while using the fingers of both hands to squeeze the pulley open. The pressure of pushing the clutch down against the belt while squeezing the pulley open with your fingers is like having a third hand to help you. It gets easier as the belt moves toward the rear of the pulley and out of the way of your fingers. Once you have the belt wedged fully toward the center of the pulley it pretty much will hold the pulley open. Then you can easily slip the clutch onto the primary shaft and install the bell and torque the nut. make sure you have the belt all the way in the pulley to give yourself enough slack, you dont want to be scraping the needle bearing in the pulley on the primary shaft as you slide the clutch into place, it should go on straight and easily. Then I rotate the vari with my hand until the belt comes up out of the rear pulley groove, and see where the belt rides.
I have played with many contra spring setups and as noted elsewhere on this forum, in most cases a very stiff spring only adds HEAT and wear to a setup. (I speak only of my 2T experience) I usually get the best results from a slightly stiffer spring than a stock spring. Sometimes just a ball bearing base added to a stock style spring adds enough stiffness, but you have to be careful with adding a BBbase to anything, gotta make sure the pulley can still open fully. I have found the BBbases work best with the shorter springs.
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Post by dexameth on Sept 13, 2016 18:59:59 GMT -5
I like all of your ideas, thanks for the input. Gives me ideas to work with. Again, thank you all.
I noticed my setup getting weaker off lines and falling into high gear too quick. Just flipped my 7g sliders for 5g sliders, gonna do a cruise in a little but to test it. The run up the street felt real nice though.
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Post by eclark5483 on Sept 13, 2016 19:36:00 GMT -5
Put belt on pulley, a piece of pipe at the bottom of the belt, then twist pipe.
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Post by ryan_ott on Sept 13, 2016 20:39:39 GMT -5
The contra is a piece of cake, try some 8-9000 rpm clutch springs. That's were you get creative!
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Post by dexameth on Sept 14, 2016 19:58:30 GMT -5
Well I got it installed. The 1.5k contra. I guess my fingers were feeling strong... Now I started messing with weights: 7g sliders. Revs way too high, all the time. 35mph tops. 9g+7g rollers. Nice, smooth, a little low on the rpms but when I get past 30 the entire scoot starts to shake violently. Maybe I misplaced the different weights. Went home, re set the alternating sizes and still the same vibrations. I haven't even left the neighborhood yet! It's late and I need a beer so I pulled the variator and clutch and reinstalled the stock contra and left the rest for the morning. More than likely I'm going to run the 7g sliders and stock contra with the shorter variator boss, it's by far my best setup yet. True, non-tucked, 40-45mph cruising... just takes off the line a little slower than I want. 1.5k clutch springs and a new belt shipped today  |
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Post by dexameth on Sept 15, 2016 10:45:20 GMT -5
So this morning I install everything, and use a mix of 7 and 5 gram sliders. Seemed good at first, but the intense vibrations came back. Anything past 30mph I get a strange resonance coming from the motor. I pulled off to a corner store and got some oil, it was reading really really low. I top it off and take off headed to work.
The motor started bogging down, losing power, and running extremely SMOOTH during deceleration. It would hesitate from a stop, and basically not have the power to go above 25mph now. I babied it home, and switched to the bicycle and pedaled to work.
I'm thinking my crank bearings are going. It has to be the rod bearings. I've never torn a motor down to the crank yet, ugh. I really think I may need to rebuild the long case motor with EVERYTHING from my short case. The short case is younger, less miles and seems to run amazing.
I'm gonna move this issue to another thread...
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AG
Scoot Member
Posts: 23 
Location: Indianapolis, IN
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Post by AG on Sept 15, 2016 12:00:20 GMT -5
I loop one end of the belt around a fence post and pull while turning the clutch assy. Easy peasy.
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Post by jkeney on Sept 16, 2016 13:50:16 GMT -5
I prefer to open it on the ground like when removing the large nut holding the spring. Once I have the belt in the center if the pulley it will stay open pretty easy while I reinstall everything.
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Post by tommyd2k on Jun 3, 2024 17:54:41 GMT -5
An easy way to compress a red or yellow contra spring is using two socket extensions. Place them on opposite sides of the pulley and squeeze them together. A 3/8 extension is just the right width so that it stays in place and you can slide one out and install the belt.
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