Today I picked up my sons 2003 Helix 90 from the shop. Prior to taking it in it did 30 MPH. I had them replace a 13 tooth sproket with a 16 tooth sprocket. I also had them add carbon fiber reeds and a "power up" clutch kit all both from Maximum RPM the performance side of Dinli. All of these things were done in an attempt to increase the top end of the machine. Upon test riding the unit it now has a top end of only 20 MPH. Why? Is it possible that they did something wrong? What should I do to get the 35 MPH I was looking for. I do not want to get rid of the oil injection or risk any decrease in reliability. Please help.
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