With the longer ratio that the 15 teeth gives, you have to ask the engine to deliver more torque at the same revs, but with still the same (insufficient) cooling while you are at the same speed.
15 teeth would be OK for people who do long rides at speed on flat highway: they will then use less gas, but just gear down to fourth when they need to take over while they might have been able to get a good acceleration in fifth with the original sprocket.
This might not have been our best idea, but both Mad Mik and I have now 200cc. engines (Joel is against this increase in capacity: 180 is what it has to be, is his trust-able opinion). Then, the 15 teeth sprocket is better with our extra power and torque, and gives the same speed at lower revs. I got 130 kmh yesterday, crouched and with slight tail wind, rev counter at about 9,000 rpm. Will do better when the engine will be well run-in. Don't know when the engine will burst, though!
Joel been able to reach 135kmh. at 9,500 rpm. (maximum allowed by stock CDI) with stock sprocket (but Race Concept prepared engine). If he had a 15 teeth one (and the power to get faster), that would have been 135/14*15= 145 kmh!!!!




This is normal as the digital gauge is based on a floater device inside the tank. When you keep the bike on the side stand, the fuel flows over to the other side, reducing the pressure on the floater thus, the incorrect reading being shown. All you need to do is keep the bike on centre stand or else while sitting on it balance it to center, switch off the console and put it on start mode again, it will show you the correct figure. This happens on other bikes as well with a digital fuel gauge.

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