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Post by ramblinman on Dec 17, 2013 19:27:52 GMT -5
i don't recall where i read this; a shorter spacer can give you more top speed (supposedly). has anyone experimented with this?
i been researching performance variators but none of them seem like they are worth the money. so i'm considering first checking to see how close to the edge my belt is riding then possibly grinding 1/16 inch off my spacer.
assuming my belt is not at the edge of the variator am i correct in thinking a shorter spacer will allow the belt to ride higher?
be awhile before i try this experiment. worse case scenario imo is i'm buying a new spacer on ebay after i mess this one up. lol
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Post by urbanmadness on Dec 17, 2013 20:17:02 GMT -5
Take pictures of the process, please
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Post by phssthpok on Dec 17, 2013 20:51:30 GMT -5
Are you thinking of THIS? That bushing (they call it a washer) prevents the drive faces from completely closing. removing it allows for additional movement, resulting in the belt riding higher in the pulley. My 150cc does not have such a bushing on the shaft. Since the variator is free sliding on the shaft, shortening it should have zero effect on how 'close' the drive faces are able to come together. Ideally their faces will make contact at their narrowest point (down near the shaft) when fully extended. The only thing I can think of that would prevent this would be the purported difference between sliders and rollers (where rollers are supposedly not able to FULLY open or close the variator, owing to their round shape, whereas the wedge shaped sliders are). If this is the case (roller not making full use of the ramps in the variator), then I suppose shortening the bushing (allowing the outer drive face to sit closer to the variator to begin with) would be one way to close the gap...but it's much cheaper and easier to simply install wedge shaped sliders (read: you don't need to take the shaft to a machine shop to have it PROPERLY shortened). Note that among all the 'performance' parts marketed for the GY6, I don't see any 'shortened' variator shafts offered. |
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Post by larry001964 on Dec 17, 2013 22:44:40 GMT -5
The post referring to removing the washer was on the old scootdawg, and you are correct that a small washer used to be used as a means of keeping your variator from closing and limiting your speed... Many many guys have taken them out and some reported a little higher top speed.. Others little difference, I haven't seen that method used in a long while but that was how they used to do it..
Speed wise will depend on your rollers, weight your pulling, and if your engine has anymore to give.. Alleyoop ( I believe ) had a great idea on the old scootdawg... Remove the washer, and with a permanent marker draw a line from the inside of the variator face to the outside.. Then take it for a ride, see how much of the mark is worn off.. That will tell you if your engine has any more to give without the washer and if you are going as fast as it will go without any other mods...
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Post by JerryScript on Dec 17, 2013 22:57:34 GMT -5
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Post by alleyoop on Dec 17, 2013 23:23:04 GMT -5
 Alleyoop |
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Post by alleyoop on Dec 17, 2013 23:33:13 GMT -5
Here is my motor being built, notice the mark on the 115mm Variator. I have tried and experimented with every possible thing you can imagine. Cut down boss will push the belt up higher BUT there is a side effect to doing that and that is now the belt is riding higher even before you twist the throttle. Also with the oem belt width it creates a lot more heat. So I tried a different width belt and I lost top end. So cutting down the BOSS may or may not be a good solution I found it was not for me, I did not want a belt to shred on me due to the heat it was creating and also a little losse of bottom end pull. Alleyoop Now the Prodigy Variator gives you good top end but a little sluggish on the bottom end. I am currently running with a KOSO which I like much better than the Prodigy Variator. The KOSO 115mm I bought from TVNACMAN to try is great, good bottom end pull and good top end which is rather rare to get good bottom and good top. You usually have to give one up for the other. Also the RPMS are much lower so that saves your motor as well. I like it so much I ordered another one from TVNACMAN just to have as a spare. Been running with it now for 2 years no problems whatsoever.  |
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Post by ramblinman on Dec 18, 2013 6:26:24 GMT -5
yes the boss, sorry i thought it was just called a spacer. |
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..BAD TO THE BONE..