Options For Modifying A 49cc Scooter
 

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45 is doable on a 49cc.

The best place to start is with a big bore kit. 150cc engine can be installed too. That would get you to 55 easily.

100cc kit. Everything you need.
http://cgi.ebay.com/ebaymotors/100cc...-/330459445932

You will want to up the carb and exhaust too. 100cc should get you to 45mph.

I don't know how well a 50 will work for your size and 45 MPH...

All I can offer is that a 2 stroke may be faster than a 4 stroke and it may be cheaper to modify.

I also wonder if a guy could put a bigger engine in a 50, maybe a 125cc manual transmission Hondoid? Cheating, but WTH. :wink:

If you can find a used yamaha zuma it will nearly hit you goals out of the box. A couple simple mods will have one running 55.

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The Zuma is a 2 stroke. 8)

http://www.yamaha-motor.com/sport/pr...1/0/specs.aspx

I think there are Chinese 2 stroke 50cc scooters too but I don't know.

Looks like Kato hit the 'Post' button a few seconds before me. That's why my info was somewhat redundant.

There are a few chinese 2 strokes, but they are hard to find. They use the zuma style engine. Most were produce in the early 2000s.

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The chinese 50cc scooter engine is pretty common on all the same. If you are looking to go fast then find one that has a disc front brake and bigger tires if possible. Replacement parts are easy and cheap.

Some will have 12" wheels and a long case engine. I would go that route and take the engine to 100cc. Use a 150cc carb and jet it down.

The good news is that for a few hundred dollars in go fast parts you will have really hot scooter.

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You can also up gear them.

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Either one will be fine. I think the disc brake is more important.

Tire sizes.
http://www.chinariders.net/modules.p...=111114#111114

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