HELP!!! Mods/Derestrictions = worse performance on 2011 Super 8 50cc 2T

[wordslinger]

...the space between the pulleys should taper all the way down to the torque driver...like this pic




..click on pic for larger view...

[wordslinger]

..here's a restricted pulley..

..my s9s both had it, as well as my 2005 people..

..neither of my a50s were restricted, nor was my 2001 people...

..i cant remember if the 03 ppl had it or not...think it did...

[zombie]

From how low the belt sits at rest I would bet the pulley restriction is the case.

[Pimpy1]

I never thought to look for a restriction on the back set of pulleys. I will have to check mine also. I have sooo much more belt dust since I installed that new var on my super 8.  

[zombie]

Check how it sits at rest. It has to be equal to the rear pulley tops, and snug on the actual drive boss. They wear faster as they get smaller.

[wordslinger]

From how low the belt sits at rest I would bet the pulley restriction is the case.


..yup, and the dark belt markings and "dust" way out on the drive face....

..shows that the belt ain't getting all the way down in the driven pulleys...

..it's getting loose, and creating that residue...

..thatsa good 5-10mph loss off top end...

[ill_eagle94]

Once it stops raining, I'll pull the cover off and have a look inside there. If it's restricted, where do I look to get one that isn't?

[wordslinger]

http://www.racingplanetusa.com/clutch-pulley-assy-clutch-torque-converter-assy-naraku-107mm-p-3888-1.html?cPath=2_18_108&sessID=a93952c7195f45279a16cbffd2d442f5


..this issa good site..annd this is the naraku clutch that is close to oem...

..they have other 107mm clutches, but i bought this one to get the unrestricted driven pulleys...

[ill_eagle94]

Thanks! I'll keep it in mind if I do have the little hump!

[Pimpy1]

Thanks! I'll keep it in mind if I do have the little hump!

Usually I like a "little hump" but in this case I am going to be pissed if Kymco found one more way to slow my scoot down. 

[ill_eagle94]

I wonder if it's there, if I could sand it down on a rotary tool of some sort.

[wordslinger]

I wonder if it's there, if I could sand it down on a rotary tool of some sort.

..NO!    you can not..

[Pimpy1]

Took a pic of the rear pulleys on my super 8. The belt stops about a 1/2 inch below level with pulleys. I guess mine has the restriction. 

[Vivo]

Ideally, at what point should the belt stop? Level with the pulley? a bit above the pulley? a little bit below?

[zombie]

Up to 2mm above. Never below. Sometimes a wider belt is needed if you keep the restricted pulley set.