luciog,
Depends on what you are trying to accomplish and what you want to do with it. Racing is one thing, trail machines have a totally different requirement (mud and water, etc)
Get the engine tuned in first, then start with fine tuning the clutching with a stiffer rear torque spring and lighter front variator weights to target the RPM's at the peak HP of the stock motor. This alone is an improvement, the OE exhaust on the later Vipers were pretty good compared to others.
Alot of guys spend the $$$ for the cylinders, pipes, carbs, etc only to not go any faster because they don't have the knowledge to tune what they already had...
In addition these asian mini quad engines are scooter derivatives so there are way too many different components that will fit (cylinders, intakes, ignitions, etc). However, so many of these together in a combo won't provide a good results because of unoptimal compression or port timing which will hurt performance.
Reality is the chances of buying 12 different things on Ebay, bolting them on, and actually getting it to gain performance is slim to none. You have to know what your looking for and what does what with what else... what needs what to offer an actual gain.
Example, a few years ago my daughters STOCK '05 DS90 was beating other modded 90 quads at alot of 300ft drag races. At that time we had never dug into the internal engine or carb, only fine tuned the stock clutch parts and gearing...
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'08 CanAm Outlander 650XT - Intercooled Turbo in development.
'08 CanAm DS250 - FPP High Performance Clutch Kit and other go-fast mod's , custom Works Performance shocks, +2" billet wheel spacers.
'05 Bombardier DS90 - FPP Hot Trail engine mod's, +2" A-arms, +3 Swingarm, Works Performance shocks.
'04 AC 90 - FPP Hot Trail engine mod's and pipe, +3" A-arms, +3" Swingarm, PEP Racing shocks.
'06 Yamaha Apex Snowmobile - FPP Stage II dual intercooled Turbo, 270HP pump gas.
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