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Post by 90GTVert on Sept 28, 2009 21:43:22 GMT -5
I got my 107mm Stage 6 clutch bell in, so I swapped over to the 107mm MRP clutch tonight.  While it was apart, I figured I'd try removing some material from the variator halves. I even stuck an extra washer in place and used the same old worn down 15mm width belt to get it dropping in most of the way. I'd still need to remove more material from the vari to get the belt all the way down though.   I can't really say it did a lot for the takeoff as I was hoping. It revs higher before it hits, and there is no bog whatsoever. It just screams instantly. Sounds good so far, right? The problem is the same one I've always had with this 99cc... it slips. Something in the transmission slips. I'm not sure if it's the belt or the clutch or what, but I can never get a hard hitting launch because it slips. I do get going a little faster, and it will still go 55MPH revving pretty high, but I just can't get a hard hitting launch. If I get going maybe 10MPH and then hit it, I can get the front end light. I must be doing something wrong. |
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Post by 190mech on Sept 29, 2009 4:37:17 GMT -5
I've missed the boat in that department also!2stroked needs to
write us a guide on how to get a variator to work like his..
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Post by 2strokd on Sept 29, 2009 7:58:06 GMT -5
No secrets here guys. Mines an on off success story. Since i put my old clutch back in its slip one time then grip the next? I cant tell you exactly why yet but last night i got Skeedr out to show my cousin how hard the launch is "for a scooter" and it slipped. It started to act like it normally did and grab but i felt it slipping and it wouldnt pull the front up. It was still grabbing good just not hard like usual. I ended up taking the vari and clutch off. It looked like the belt was slipping, or the vari was spinning on the belt  . I cant help but wonder if the change in the weather helped cause this because i hadnt had any slip before with this setup. Thats another issue, my clutch is shot and im not sure it wasnt slipping, the bell looked awful this time and there was an awful lot of clutch and belt dust in there for only having a few miles on it since reassembly. I am sorry if i led you guys down a dead end path  . This mod has worked great for me until last night  Of course i will post results with my new clutch and vari setup, hope it dosnt slip too |
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Post by 2strokd on Sept 29, 2009 7:58:57 GMT -5
I like the MRP clutch and the Stage6 bell you got Vert ;D
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Post by 90GTVert on Sept 29, 2009 8:08:10 GMT -5
The MRP and Stage 6 are certainly capable of late engagement. I had to go back to 1500RPM springs and it's adjusted to be low revving.
The vari mods I dded worked out, I do think it gets up to speed a little easier, I just can;'t get those launches no matter what I do because of whatever it is slipping. I did notice that my rear pulley is openeing up a little before the clutch even engages, maybe I need a stiffer spring to keep it pressing on the belt harder. I dunno. Whenever I've used stiffer springs that 1000RPM, the big motor doesn't like it. My 70 used to love a 2000RPM contra.
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Post by 2strokd on Sept 29, 2009 8:36:15 GMT -5
Really? I can only get away with a 1,500 contra. I havent tried a 2,000 yet but with the 1,500 i think it in the money for now.
When i first got my kit in i was using a 1,000 but i either started making more power as the cylinder broke in or the spring got weak because after a few weeks the 1,000 wasnt doing the job(felt like it was short shifting) so i went to the 1,500. Your bigger motor makes more torque and dosnt like to rev real high. How bad is it slipping? Like i gotta let off slip, or a throw you back in the seat but we still didnt do a wheelie kinda slip?
Try a 1,500 contra if you have one, cant hurt to try with a new setup.
I did notice that my belt was ALL the way down to the drive boss on the vari and up to high on the rear pulley. It was a couple mm out of the pulley. That is with the factory spacer in the vari for what usually is a hard ass launch.
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Post by 2strokd on Sept 29, 2009 8:46:35 GMT -5
i would feel kinda stupid if you guys hadnt seen the video of Skeedr with this setup working good... Now i want to go out and figure out why, were this slipping is coming from. Truth is with my situation i really dont care why. My stock clutch and bell are worn out bad, the bell is ALL blue and thin and looks bent a bit and the clutch shoes are starting to wear to the metal, and i have had to straighten the bent back plate on it only to pull it off last night and see it bent again. I will work with my new setup when it gets here ;D, hopefully today! My old stuff would be in the trash but i can hardly throw anything away from the scoots. It will be a "practice" clutch lol. BTW: I like the sounds of the MRP clutch you have Brent  . Is the back plate any thicker or of better metal? Also i noticed the vent holes in the plate. NICE stuff bud! |
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Post by 2strokd on Sept 29, 2009 8:50:15 GMT -5
Those shoes stock next to MRP,s are comparable to a pair of mens big ole boots sitting next to a runners light and grippy running shoes.
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Post by 90GTVert on Sept 29, 2009 8:52:27 GMT -5
I think the plate is about the same. I stuck a 1500RPM spring in just after I posted. The belt satys up a little farther out back, but still moves before the clutch hits. I just came in to get my camera. i'm gonna see if I can get a video of the CVT when I take off. I don't think I can really get a vid to help me see what happens unless I mounted a cam to the scooter somehow. That's not happening because I'd need some crazy bracket and I really wouldn't feel that safe with my camera that close to the ground and that close to fast moving parts.
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Post by 90GTVert on Sept 29, 2009 9:38:44 GMT -5
I stuck the slow-mo parts in the end to get a better idea of what's up. First off, my backwards push or roll isn't helping anything. Can't say I ever noticed doing it before. Second, it looks like after it gets going the right way, the clutch slips for just a split second and then it's fine. Of course we can't see well enough to know if there's a slight slip.
The 1500RPM acted the same as the 1000RPM up to about 25MPH. Then it revved a good bit higher and took off slower. It maxed out at about 50MPH. Back to the 1000.
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Post by 2strokd on Sept 29, 2009 10:24:10 GMT -5
good vid, i see what you are talking about. Only thing of off the top is changing the weights but i think you have already found your sweet range. Looked like it took off well but i did hear it revving a bit higher than it was going?
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Post by 90GTVert on Sept 29, 2009 11:13:05 GMT -5
Yeah, that's how it's always been. I either get bog or this. I stuck the 1000RPM spring back in. I noticed my top starter bolt was gone, and went to put a new one in but it wouldn't thread in far. The last bolt had broke off in the case. Then I noticed that the lower bolt had done the same thing. I'm not real sure how to get these out short of splitting the cases. There's no room to work with anything in there. It's hard enough just to start and tighten the lower bolt, let alone remove something that's broke off in there.  Today is turning into bad day. I just got a call from soemone that wants work done... but it's not a scooter. It's an '85 ATV with no compression. The ownder wants a little more power while it's being worked on. When I looked it up, parts are scarce and any performance work requires machine work. Last week all I got was a go kart. I just wanna work on scoots and I get calls about everything but. Money's money, but I have a hard time giving someone good advice on something I don't know anything about. Then I checked my email and the 47mm cylinder head I ordered for the Sunl is not in stock. |
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Post by 2strokd on Sept 29, 2009 14:07:45 GMT -5
sorry things are not going smooth today bud . I was wondering if you having taller gears would contribute to the slip ? |
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Post by 90GTVert on Sept 29, 2009 14:18:39 GMT -5
The gears might be the issue. Being heavy prob doesn't help much either. Just weird that I can go 10MPH and then it will grab.
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Post by 190mech on Sept 29, 2009 20:09:02 GMT -5
Can you get to the bolt holes thru the variator side?Maybe pull the reduction gears off,might have to drill thru the casting to get to them,but should be 'safe'.. 2stroked,sorry your drag launch has evaded you,hope you find the cure soon,We are counting on you! To confuse matters worse I found this link for torque driver mods,maybe I can try this if I ever get a day off.. www.scooterinvasion.net/forum/viewtopic.php?t=479 |
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. I cant help but wonder if the change in the weather helped cause this because i hadnt had any slip before with this setup. Thats another issue, my clutch is shot and im not sure it wasnt slipping, the bell looked awful this time and there was an awful lot of clutch and belt dust in there for only having a few miles on it since reassembly. 
. This mod has worked great for me until last night 
. Is the back plate any thicker or of better metal? Also i noticed the vent holes in the plate. NICE stuff bud!