I’m getting 40-43 mph with a 90 cc engine

It goes 65mph

Lose weight.

It depends on how much you want and there are parts for that engine. A high performance air

filter should be the first mod on any engine. Free flowing exhaust on a dirt bike will add HP as long as you are ok with the louder exhaust and it is allowed where you ride. Depending on the make, camshafts, stroker kits and even turbo kits are available or can be built yourself with parts available.

Once you've increased your power a rear gear change will allow you to pull a taller gear, giving you a higher top speed.

40-50 mph depending on ur weight

polini would proberly be the best due to the fact you do not need the expensive ecu upgrade

if your not on a budget then go for the malossi kit both can be purchased here

http://www.adrenalin-pedstop.co.uk/

Well, There's quite a few things you can do. Everythign ranging from Ordering parts like Headers, intake manifold, camshaft, nitrous, supercharger (or turbo), changing the settings in the ECU (Fuel injected motor). all kinds of stuff. the list goes on and on. Email me i can get you the parts :-) -chris 1987Formula@live.com

First you got to decide how much money you want to envolve and then you have to decide how far to go. There are many ways to answer but first you have got to have the basics, How much money, how fast, and how far

70HP according to Polaris

get a nitrous kit off ebay....probily 20-35$

or ther is also a way to bypass one of the trotle spring to allow higher rpm's you can use a a pice of wire or somthing of that nature. do this by replacing the small spring with this wire.

Even cagiva can not answer that question just ask them!

I have the same dirt bike and what you have to do is go to the carberator and twist a screw on the side of it to where it is all the way in and that pretty much makes the governor disabled . I have done this with my dirt bike and it added about 20 mph, it will not hurt the dirt bike in any way just take off the bulshtii governor that maeks it go slow as hell, i race against 125's and i still keep up now . good luck everybody ride hard

another thing you could do is buy a rev box to give your bike more rpms but the only problem with taking off the govenor is that the govener is there so you don't blow up your bike cause without the govener your bike will go just as fast as you throttle it so you can blow it up

Depends on if you want top end or acceleration.. Without spending more than the bike is worth, you might first try an aftermarket exhaust, rejetting the carbs or different sized sprockets. Sprockets would be the cheapest.

Spark plugs are designed so that they transfer heat from the combustion chamber to the head where they are mounted. If they stay too cool you will get high emissions, poor fuel economy, and generally poor performance. If they get too hot they could ignite the fuel mixture without a spark, but more of a concern is that they could overheat the piston and possibly melt a hole in it. Plugs of similar design are manufactured with different amounts of insulation around the center electrode to control heat range. Engine manufactures will sometimes recommend different heat range plugs for different applications. Engines under heavy load and/or operated in high temperature environments will use a "cooler" plug then those that are not constantly stressed. You should use the manufacture recommended plug heat range unless you are doing something the manufacturer never anticipated.