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Post by 90GTVert on Jun 27, 2010 20:40:31 GMT -5
You might wanna spend some time with files or soemthing and try to straighten out that drive boss.
I've been modding my performance variators too. lol
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Post by duosport on Jun 27, 2010 21:08:17 GMT -5
You might wanna spend some time with files or soemthing and try to straighten out that drive boss. I've been modding my performance variators too. lol Sorry I am not clear on all the part names. The bushing that I slide onto the shaft is perfectly fine. The shaft itself has some small distortion on the shoulder edge. That I did file a little this morning. There was only a very little filing required. I then put the spacer washer back in place. This made it so when I tightened the variator nut, it did not contact the shoulder and cause more distorition. The problem is that it ran better with the washer out. |
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Post by duosport on Jun 27, 2010 21:12:20 GMT -5
I could take the washer out from inside the variator and place it behind the nut and washer. I am not sure that would work well or not. The washer might still contact the shoulder when tightening.
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Post by duosport on Jun 29, 2010 20:57:52 GMT -5
So while executing my daily rutine of removing the kickstart drank airfilter and CVT cover I looked at the back of the aircleaner box. Previously I mentioned the narrowing of the air passage just after the carb, today I noticed what looks like a rubber reducer or something on the back side of the airbox. This would be the main air inlet to let outside air to the filter itself. Now I know I had or still have gas starved carb. Maybe now with the modest upjet I did there would be need for additional air? Or maybe my jet was way too modest and I should have listened to sagacious advice that was given and gotten a broader range of jets. But the back inlet to the box has that rubber jobber in it. I tried pulling at it a little with a pliers but not cure it is meant to come out, or if it should be out.
by the way I took the washer that I had put back in the inside of the variator and relocated it to the "nut" side. the washer was perfect for compensating for the grinding I had done to the boss. Do I have that right "boss"? that washer then kept the kickstart gear and nut from contacting the shoulder of the sshaft that was exposed by the slight grinding of the boss. I am glad I only removed the thickness of the washer as any more would have required something else to be done other than simply the added washer. I rode it and it indeed it gave me back the mile or mile and a half that I had lost off the top end. I did not notice any bad effect at all to the pick up. I have the feeling that I would benefit from further moving of the belt to the outside of the sheave as I still have like a 1/4" to go yet. Seems like the next steps are more radical.
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Post by 90GTVert on Jun 29, 2010 21:15:52 GMT -5
Yeah, I call that sleeve that fits over the crankshaft's splines the drive boss. Slowly filing the variator faces might be your easiest bet for getting those pulleys closer together. Or perhaps see which part you can get the cheapest and mod it. If the boss is cheaper, grind it more. If the variator's fixed half is cheaper, file it a bit. Mess around with it with the rollers out and without the belt in place to make it easier and see how far you can get the pulleys to come together without having the ramp plate separate from the guides in the back of the variator.
The air boxes for these minarelli engines tend to seem really small, but they usually work fine. I've been over 50MPH with that little snorkel in place. I took it off of my Venus' airbox and it really didn't make much difference that I noticed.
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Post by duosport on Jun 29, 2010 21:28:03 GMT -5
Short of moding my sheave as you have done, I suppose that if I change it so I get more top end I will start losing bottom. At some point one has to say its fine and go ride it! :riding:
I know on the 50cc 4 stroke carb that I had upjeted the thing started with a #68 and the guy at the scooter shop that I got the jet from said that my scooter came with a small jet (68). What I am saying is that it would appear that the Gurtner carb has a really really small jet to start in a 64. When I put a #72 in the little 50cc 4T it did not require an airfilter change.
I probably can go bigger on my jet.
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