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Your bike has a SOHC ( single over head cam ). The only way to get significant speed increase out of your 97cc engine is to send the cam to a company in California and have them re-grind the cam to create a race cam. The 100cc bike will respond as if it were a 125cc or better. Below is their website.
If you are considering racing in F4 or Buckets on your motoFXR you have a choice of running street tyres (BT39 are great) in the production class or you can fit slicks and run in the Super Bucket class (these are South Island Classes) if you fit slicks on stock FXR rims you need to run tubes inside , the slicks are 95/70-17 fronts and 115/70-17 Rears, same as RS125 GP bikes use, this is not a perfect solution as the rims are slightly narrow and the contact patch on the ground is not optimum.
To get a really nice profile on the tyres you can fit some other rims, my bike has RG200 rims and the tyres fit great, GSXR250 rims are good also they have a 2.5” front and 3.0” rear, there is a wee bit of machining to be done at each end as the front bearings don’t fit the fxr axle and the rear disk has to be moved inwards aprox 10mm.
Usually the slicks we run on F4 or Buckets are used RS125 tyres which are relatively cheap but sometimes hard to find. A 15hp bike doesn’t exactly eat tyres like a 50hp bike so they last for ages, if they are a bit hard you can borrow a grooving tool and cut some groves in the tyre, this makes them heat up more, also it makes you feel better about riding with slicks in the rain
Ive just bought a 2000 model RS 125 but my knowledge of bikes is pretty limited :/ The bike was running fine for a week with no problems at all but then the electric start doesnt want to work. I went through the manual and tried a couple of things (recharged the battery checked fuses cleaned spark plug etc) After I did this I still didnt have any luck but the electric start sounded abit more promising. I gave it another couple of goes and it started but when I let the throttle off the engine died and Im back to square 1. Anyone have any ideas about what could be the problem? I was talking to a friend and he said that I need to make sure that there is power going to the motor. He mentioned using a voltmeter to see if there was power going into it. He said that if there was no power then it would need a new electric start but if there was then I would need something else but I cant think what? Does this sound right to anyone?ou'll be able to tell if the ignition system is okay if there's a spark at the plug against the head with it removed when you kick it over (is there a kickstart lever on the bike?)/spin it over with the electric start. You could try bump starting it to see whether its just the electric starter motor or the ignition system itself that's the problem. If you do have a good spark then the bike should start with a bump push start/off the kicker (does it have one?)then you'll know whether the starter is the problem. My bike's kick-start only though so I'm no expert on starting Aprilia RS125's...Good luck. Don't waste money on new parts until you're sure of the problem though.,,,