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Post by 190mech on Jul 1, 2010 20:12:52 GMT -5
Stock size carb should be fine if jetted right,mine liked the stock airbox with the snorkel removed,wouldnt'get out of its own way' with a foam sock filter,like Brent said,those rollers need to be 4 to 4.5 with stiffer contra spring and clutch springs to get into the pipes working RPM.Good Luck!!
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Post by 90GTVert on Jul 1, 2010 21:14:42 GMT -5
I forget what sizes my stock cars are, but I've used a 49cc carb on a 99cc before and it would work. Not ideal, but it was rideable. I think carb tune would be more likely than carb size to cause this issue. Prob something 80-90 main, clip in the center to start, adjust low speed mixture, and of course make sure the float height is set properly while the main is being changed.
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Post by WT100 on Jul 2, 2010 13:32:08 GMT -5
Ok i guess it is time to go into the carb. Where do you get the main jets for the "Leader" carb?
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Post by 190mech on Jul 2, 2010 14:15:53 GMT -5
Check the thread pitch,a lot of jets are 6x1mm and will interchange.Mikuni,Keihin and Delorto all use this size.
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Post by 90GTVert on Jul 2, 2010 15:49:13 GMT -5
Most likely they're a Mikuni VM11/22 style. JetsRUs.Com and RockyMountainATV.Com are good sources.
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Post by WT100 on Jul 2, 2010 16:00:56 GMT -5
Thanks guys!
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Post by 2strokd on Jul 2, 2010 23:27:54 GMT -5
Hhmmm, Thats weird Tim :stumped: ! I know those guys are good and know what they are doing but it almost sounds like what a restricted pipe would run like  ? Im not sure, like i said, im sure they know what to check for.?. Thats just weird to me that your scoot wouldnt even perform at all with a decent pipe :rant: ! Something is up for sure! Go ahead and check your carb size, but im sure its an 18, or close to run like you say. Maybe not tho, ive been fooled for less! But if it ran that good at those rpm,s then why not with a pipe? Maybe the weights were still to heavy? Mine was dead in the water waiting for the pipe to hit with too heavy of weights. It will still pull you, but if it dosnt get into the 'powerband' of the pipe it will be slow as hell! You saw how bad Skeedr took off at the track ! Prime example of a new pipe and a bad CVT tune! I know it took off eventually but you see my point? Ive had em to were they wouldnt even go over 20MPH! 70cc, 21mm carb, custom pipe, tuned cvt, too heavy of weights in the vari=20MPH  . Hope ya get it ironed out soon! At least ya can still ride ;D |
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Post by WT100 on Jul 2, 2010 23:48:36 GMT -5
Well it is running good back with the stock pipe so we will take time to figure it out.
I passed along all the ideas here and i think we ill go into the carb next week if he has time in the shop and see what is what on that side. It has got to be there. I know he tried several rollers.
Thanks for all the ideas.
Never give up till i get to hear that sweet popcorn sound!
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Post by 190mech on Jul 3, 2010 5:30:09 GMT -5
My roller scheme is to put super light rollers in,that'll let the pipe go to work then start going heavier until the belt gets to the top of the variator pulley,seemed to work better for me to go light to heavy than the other way.Then the CVT system wont bog down basic engine tuning,once the carb is 'rough' tuned to the pipe,try heavier rollers,,
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Post by 2strokd on Jul 3, 2010 14:19:36 GMT -5
My roller scheme is to put super light rollers in,that'll let the pipe go to work then start going heavier until the belt gets to the top of the variator pulley,seemed to work better for me to go light to heavy than the other way.Then the CVT system wont bog down basic engine tuning,once the carb is 'rough' tuned to the pipe,try heavier rollers,, Great advice :cheers: ! |
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Post by WT100 on Jul 3, 2010 17:46:19 GMT -5
Yes, thanks 190 "process" helps me understand for sure.
Hoping to jump on this again early next week.
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Post by drawkward on Jul 4, 2010 0:17:13 GMT -5
And it's really easy to tell where the belt is stopping at, it's a dark line.
I use 3.5g to 4.5g depending. I like 4.0 grams because it gives me the most top ending without sacrificing too much on the line.
I think a red contra with a lightened clutch and red pill springs couple with 5g sliders would be ideal. Red contra would keep the 5g sliders from pulling open the torque driver too quickly allowing it to shift a little slower so the heavier weights could stay in high rev and where the power is at with expansion chambers. Let you really feel the pull of it without over revving on all the gears.
Play with the springs, it's not just about the rollers.
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Post by WT100 on Jul 7, 2010 20:37:58 GMT -5
Soooooo the rest of the story  After i left the shop Tim tried the LV pipe on a couple of other scoots with no gain and finally noticed a restrictor INSIDE the pipe. Not a washer but a funnel like thing. So he ground that out and when i drooped by today just to make our new plan we started by trying the opened up pipe again. Holly TNT Batman! He did a little roller work settling on 4.7g s and left it there for today. He is getting jets and a 2000rmp spring for us to mess with next week. The gains so far. I ran a couple of hills that i have documented times on. Hill one before pulled me down to 27mph, now 35mph. Hill 2 before 25mph, now 33! Couldn't believe it so i ran them again. Yup, i really gained 8mph! The restrictor  And the new pipe that makes me smile.  More results: It "hits" at mid 5K and jumps to 8K. That rocks! A little more top end 51 - 53 but won't hold it for long. Video coming ;D |
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Post by 90GTVert on Jul 7, 2010 21:20:11 GMT -5
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Post by stepthrutuner on Jul 7, 2010 21:21:40 GMT -5
A little more top end 51 - 53 but won't hold it for long. Video coming ;D Glad ya'll found the gremlin. Richening up should help hold that speed. That must be a pretty mild kit. I'd think low to mid nines should be possible.... tucked down anyway. Up-jetting might help that a little. Try some carbon fiber reeds next. |
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? Im not sure, like i said, im sure they know what to check for.?. Thats just weird to me that your scoot wouldnt even perform at all with a decent pipe :rant: ! Something is up for sure!
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