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Post by 90GTVert on Aug 19, 2011 18:46:59 GMT -5
If that's an otherwise stock engine, you are probably revving right past all the torque by the time the clutch is completely engaged. Without porting or adjustments the stock 90s don't like to rev a whole lot. Not saying they can't but they end up making peak power in the 7000RPM range stock.
What final drive gears are in it? (Count how many times the clutch bell has to rotate to rotate the tire one full turn.) If they're 10-11:1, it's gonna be tough.
You also need to make sure the belt is able to get all the way to the center of the variator and outside of the rear pulley when at rest so you get the best gear for launch. Plus, if the clutch engages too late, the belt will be moving to different gearing before the clutch is engaged all the way.
There's a lot more to it than just assembling and kicking ass unfortunately.
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Post by 90GTVert on Aug 19, 2011 22:51:18 GMT -5
I dunno what's in that scoot stock. It would be worth looking into though.
Get that belt to the edge of the rear pulley and you'll see an improvement. That's probably gonna mean using spacers or modding the variator faces so the belt can ride low up front. Doesn't sound like you need any more contra stiffness or any lighter rollers. Might need to back the clutch down a bit? See if you can watch it somehow to tell if the clutch is engaging before the belt starts moving to change gears.
My Venus is the only scoot that will wheelie for me. It's a short wheelbase, 11:1 or so gearing but little 10" wheels. That's the biggest part. Building a scoot with a 12" wheel and 10:1 gearing and a longer wheelbase, it's totally different on takeoff. The gearing is a tradeoff though. Hard launches or high speeds.
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Post by ilaurain on Aug 22, 2011 9:05:23 GMT -5
I checked the gearing for the stock 50 motor and the 90 motor, they are the same, 10/1 ratio. I did change the rollers to stagger them with 4 and 6 gram weights to equal 5 gram. I spaced the variator so that the belt acctually rides on the center spindle in the variator untill the rpm's pull it together, so its as low as it can possibly get. I have the same blue torque spring. I changed the clutch using the hard black springs but set to the least tension setting the malossi offers. I set the weights on the clutch to the hardes launch settings still. The main jet got changed from a 92 up to a 100. With all these adjustments the bike is approximately 40% funner to ride now. It was a nightmare finding the best combination to make it accelerate well. I had all the popular go fast parts on it but it needed to be matched up properly like you told me. It still dont power wheelie, I believe because its a bigger scooter with heavier wheels and a longer wheelbase. Although at about 10mph i can pin the throttle back and give a tug up on the bars and it will pull as high as i want untill i let off the throttle. The top speed on a flat surface is between 50 and 53 mph, but acceleration is fast.
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Post by ilaurain on Aug 22, 2011 9:08:47 GMT -5
This bike has been really fun overall to build up. The only problem is that like anything else i have, i get bored when the project is done. I would love to start a new project now. I think i would like to build a madass 125 next.
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Post by 90GTVert on Aug 22, 2011 12:00:01 GMT -5
There's a lot farther you could go with this one if you so desire. 50-53MPH is just getting started with these big minarellis. I can't blame you on the madass either. I really want one to play with. Post that project for us if it happens!
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Post by drawkward on Aug 22, 2011 16:00:20 GMT -5
I'm in love with the MadAss and I haven't even seen one in person.
Are you running with a 70cc Leo Vince ZXr or the 100cc version?
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Post by ilaurain on Aug 22, 2011 20:16:54 GMT -5
the 70 cc version as it is the only aftermarket pipe i had
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