Quite a few number of possibilities:
1) You're not getting enough fuel (your carburetor may need adjusted)
2) You're not getting enough air (your carburetor may need adjusted, you may need a performance air intake)
3) Your carburetor:
--float type
may not be able to keep enough gas in the fill bowl to keep up with the fuel need of the engine
--diaphragm type
same as with the float type, but the diaphragm cannot pump in enough fuel to the carburetor to keep up with the consumption of the engine
4) Could be a problem with your CDI if it has one. If it does, might want to look into upgrading to a racing CDI (and the speed\rpm governor\limiter might also be a part of the CDI which might be what is cutting you out when you go above 40-45mph)
Good Luck!
I can't give a definite answer but hopefully the above checks will help you out.
On my 49cc scooter engine the carburetor is found on the engine. The engine is broken down into 3 parts, the part to the left (looking at it) where the air filter is is right next to the carburetor.
what is the best performance 49cc motorized cycle 4 stroke and Indians are brown
You have to clean the carburetor usually that's the main problem
I am sorry but there are no performance pieps for those scooters that are directly available. Try an Ada s1 or s2. maybe a jetpro
One way to make a 49cc pocketbike faster is to get a performance airfilter, or a new muffler, or a new carbureator. You can find all kinds of parts for pocketbikes and gas scooters at www.partsforscooters.com they have performance parts of all kinds of scooters and poketbikes and dirtbikes and they also have stock original parts that came with the vehicle you purchased
what is a 49cc dirt bike
check air filter.if u have a filter for the gas on the line, make sure its not clogged up
49cc. 49cc. 49cc. 49cc.
A 14 year old may be able to rid on a 49cc in public woods depending on the state in which they reside. It is best to check with local ordinances before riding in a public place.
What's does the fuel valve do on a 49cc dirt bike
Is a license required in Florida to drive a 49cc scooter
I am thinking that your carburetor needs to be cleaned. Follow this link to Ronin Cycle Parts for a detailed step by step how to on cleaning out your carb. http://www.ronincycleparts.com/category/howto/mini-bikes/how-to-clean-a-performance-or-stock-four-stroke-carb/