What Size rear sprocket you guys running on the scorpa sy? what is the STD And what is the norm am not sure what's on it at the moment but its not very big 

10:38 is stock.  I just went to 10:40.

Edited March 23, 20188 yr by pmk

I read 10-42 is good 

I spoke with Mike Komer while seeing if his shop had a Talon rear sprocket with added teeth from stock.  His recommendation was 40 or 41 being what he rode back when these bikes were current.

Mine at 10:40 seems good so far.  Better low speed control and less abrupt launch.  41 might work, but suspect 42 would have difficulty keeping the front wheel floated as the engine winds up quickly.

cheers for the info ill try the 40T 

You might not easily find a 40t with the countersunk holes.  My recent search only found oem 38t with countersunk holes.  Ultimately, I bought a new old stock and modified it to fit properly.

If you are also installing a new chain, do your homework, as some chains are physically larger than others, and will require attention on the tensioner block and possibly the center exhaust box.

40T is no problem to find hear with the counter sunk holes just ordered 1  same with the chain never had a problem.

Edited March 27, 20188 yr by bondy

Ensure the chain is properly tensioned and keep an eye on the exhaust midbox.  You might see chain marks on the exhaust.

ok I will when I come to change the chain.