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Post by tenaciousb on Jun 18, 2007 19:29:53 GMT -5
Hey all,
I'm getting my Aprilia SportCity 250 this weekend, hopefully dealer gets it in, but anyway I'm looking to upgrade the variator and go lower weight rollers, but how do I know which ones to use?
I understand the theory, lighter = more rpms, but I don't want to go too light and be at the redline all the time.
I was told the Malossi comes with 15 grams. So stock must be a few grams heavier than that. I have yet to find anyone who knows for sure what the stock weight is. I was thinking of even going with a set of 14's, but I noticed they go all the way down to like 7.5 grams.
Any suggestions?
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Post by scooterollie on Jun 18, 2007 20:31:39 GMT -5
I am not familiar with the weight of the stock rollers in the Aprilla 250 but on our other Chinese 250s, the weight of the stock rollers is usually in the mid to upper 20s. Weights you mentioned sound more like ones for 50 - 150 variators. Weights for 250+ variators are also larger in size in addition to heavier. Might be best to wait until you get the scoot, allow it to break in and loosen up and get a feel for how it responds. If you still feel the need for more low end pickup, remove a roller and weigh it. Then go down 2-4 grams in weight. Stan Jessup has a formula for roller weight size based on the rider weight.
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Post by 90GTVert on Jun 18, 2007 21:16:22 GMT -5
Unless you find someone that knows exactly what this scooter has in it from the factory, you are just taking wild guesses. There are LITERALLY HUNDREDS of sizes (diameter and length) as well as weights of rollers. The CFMoto 250 uses six 23x18 or 24x18 (18 length, 23 or 24 diameter) and are stock in scooters with 26 grams each. My RR250 has EIGHT rollers in it that are 11 grams each and a completely different size. So, two similarly sized engines and one using 156 total grams and the other with 88. The ONLY way to get where you want to be with any degree of accuracy is to install a tach, record your RPM's at full throttle on level ground (several passes on the same stretch), then decide what RPM's you really want to see it running at. Then, open the variator and see what you have and buy the weights you think will get you where you want to be. Stan Hey all, I'm getting my Aprilia SportCity 250 this weekend, hopefully dealer gets it in, but anyway I'm looking to upgrade the variator and go lower weight rollers, but how do I know which ones to use? I understand the theory, lighter = more rpms, but I don't want to go too light and be at the redline all the time. I was told the Malossi comes with 15 grams. So stock must be a few grams heavier than that. I have yet to find anyone who knows for sure what the stock weight is. I was thinking of even going with a set of 14's, but I noticed they go all the way down to like 7.5 grams. Any suggestions? |
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Post by scooterollie on Jun 19, 2007 11:07:36 GMT -5
Stan;
Thanks for chiming in. Didn't realize the Linhai CVT had more, lighter rollers. My weight is only 145 lbs. and I am generally satisfied with the performance of my CFMoto engine/drive train. May go a couple of grams lighter sometime in the future, just out of curiosity. Results with the "J Costa" variator sound interesting but I haven't researched if there is one for the CFMoto/Honda style variator.
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Post by 90GTVert on Jun 21, 2007 8:54:22 GMT -5
The most bang for the dollar spent is in the rollers (not the variator), but I never assume every scooter uses the same rollers since as you can see, there are literally hundreds of possibilities. MRP keeps wanting me to carry more variety of items, but I think my theory of sticking with the items I know work is a better plan. Since I do this as a hobby, the carrot of "more profit" doesn't do much for me. I use the "profit" to buy more scooters to review and test fit parts on so everyone can benefit. So far, it works for me. This is why I won't take a "free" scooter to write articles about also. I think that becomes a compromise and more of a paid advertisement rather than an honest independent review of the product. Some companies will play, and others are affraid to, but that's fine with me. It tells me which ones have confidence in their product. Stan Stan; Thanks for chiming in. Didn't realize the Linhai CVT had more, lighter rollers. My weight is only 145 lbs. and I am generally satisfied with the performance of my CFMoto engine/drive train. May go a couple of grams lighter sometime in the future, just out of curiosity. Results with the "J Costa" variator sound interesting but I haven't researched if there is one for the CFMoto/Honda style variator. |
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Post by scooterollie on Jun 21, 2007 9:14:32 GMT -5
Stan;
You are a good man, Charlie Brown!
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Post by livewire on Jun 21, 2007 10:27:00 GMT -5
This might be a stupid question , but for us novices, but what's the whole theory behind the roller weights and how they work within the system....
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Post by linda on Jun 21, 2007 13:49:30 GMT -5
HELP I"M in big trouble!!!
I went to replace my belt today on the bali 250 took everything apart to check the weights. Put the cvt cover back started it upand heard a horrible grinding sound. Come to find out I didn't put the fan over the variator cover back far enough and ground out a few notches on the spline. Now after we pryed the variator off we cannot get anything back on. I tried lightly filing the grooves but to no avail. Is it over for me? Do I have to find a mechanic to replace the spine. I don't have the money, and at this point with only twenty miles on my scoot I'm ready to hang myself. If anyone has any ideas on how to fix this thing I will be so grateful.
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Post by A J on Jun 21, 2007 23:16:48 GMT -5
Linda,
Can you post a few pictures ? That might help.
A J
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Post by linda on Jun 22, 2007 0:46:17 GMT -5
Hi, unfortunately I donot have a web cam. Scanning the haynes manual its the crankshift shaft, splines. When I started the engine with the new belt on sounded great. With the cvt cover on, a loud grinding noise. I guess I didn't push the round piece of the variator with the weights in them back enough. Impact wrenched the variator fan (front part of )and it was grinding into the cvt cover just for a second, long enough to burr up the splines. Now I can't get the variator back on over the splines. I'm praying I won't have to have the crankshaft removed to replace the shaft. UNBELIEVABLE.
I'll keep you posted. Thankyou
Linda
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