can i derestrict a predator 90 or make it faster?

 

I'll assume it's a 2 stroke? If not mistaken the Etons and Polaris Predators share the same parts. Have you checked or removed the exhaust spark arrestor if your model has one? We removed the one on my daughters viper which helped by about +2 mph on top end going by GPS.Does it have a adjustable rev limiter? If not the Predators may have a wire off the CDI you can snip,I know on the older Etons you could. Swapping clutch roller weights is pretty easy/cheap and can make a big difference on MPH as well as torque but it does have draw backs. Stock is around 6.5g, dropping down to 5-6g will make a big improvement on bottom and mid range power and takes the bog away but you loose top end speed.Heavier weights improve top end power but takes away from the bottom, it's a balance act,your not adding any HP,just using what you have. We have run the stock 6.5's ,8g which was killer on top end but had no take off and 6g which we changed the other day,it lost about 4 mph on top end but my daughter loves the new take off power,actually picks up the front wheels taking off.Usually any change you make,Uni filter,Exhaust ect.. you will have to do some tuning to get it right,either to the carb, sprockets or clutching.We bought a tuned pipe and stuck it on the ATV 2 years ago and it killed it on bottom end to the point of nearly pushing it to get going but the little 70 would run 42mph on top end,so we had to make changes to the clutch.We did not see much change in reed swaps.There are alot of big Bore kits on the market but just adding a Bore kit will help but as mentioned you will have to rejet and do some tuning.I do know from trial and error just bolting on a performance part does not always mean performance.I'm sure some of the others will chime in

 

There are 101 options for making your machine faster.
The first step is usually a pipe, then a carb.
Both restrict the heck out of the machine in stock form.