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Next to the throttle there is a screw that limits the throttle. Don't have to remove it just have to screw it all the way out.

The manufacturers govern the speed of small quads by gearing it down as dictated by goverment regulations.

If you are looking for more speed you could change the front sproket. Find a sproket with (2) more teeth that is the same as reducing the rear sproket by (4) teeth. It is easier and cheaper to replace the front sproket. You may even get away with not having to add any links to the chain.

My son has the 50CC and it has unbeliavable tork but no top end. The 50CC is limited to something like 15 MPH.

The 50CC comes with 16" tires I put 18" tires and got a little more top end.
 

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The factory restrictors are the jumper and the throttle screw.

If you are want you unit to faster then 30 (or so) faster, then you'll have to start applying mods. These mods range from engine, pipe, tranny, carb, chain/sprockets, shocks and even wheel sizes. To obtain more details, you want want to surf / contact the following companies:

http://www.atv-kids.com

http://www.wrhracing.com

http://www.dirtrides.com

http://www.miniquadracing.com

http://www.trinityracing.com

http://www.hi-pointmotorsports.com

http://www.hetrickracing.com

http://www.miniatvparts.com

http://www.apb-racing.com

http://www.hardrockmotorsports.com

http://www.ebay.com/ -> search for ATV * Good for things you know will work with your package. For example, K&D Filters, etc.

During your conversations with each of their respective Modification Consultants &/or Sales Reps, ensure you specify your riding conditions (re: racing only, trails only, big jumps, mixed, etc.) and if there are any limitations you must stay within. If you race your quad, some modifications are NOT allowed (depending upon that specific track). For prices, you can "shop around" or send each into discounter counter offers. Each may or may not lower their prices for you. As a final note, try to stay with the same "bundled package" of modifications from the same company. For example, don't mix clutch upgrades from one company, pipe upgrades from another company, and head upgrades from a different company. Try to stay with one company for all "specialized" bundled packages.

I hope this helps...

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