100cc 2 stroke motorized bike will hardly top 36kmh

[newuser3466]

My 100cc 2 stroke motorized bike china motor off Amazon is rated for 60kmh and hardly tops 36kmh can anyone help with why I’ll post a pic of the bike

 

[Sidewinder Jerry]

There is a break-in period for these engines.

 

[newuser3466]

There is a break-in period for these engines.

I’ve broken it in with 16:1 and 25:1 and now I’ve went up to 32:1 and hardly does 22mph

 

[Sidewinder Jerry]

I’ve broken it in with 16:1 and 25:1 and now I’ve went up to 32:1 and hardly does 22mph

What is your drive ratio? 10\44, 10\48 etc

 

[newuser3466]

What is your drive ratio? 10\44, 10\48 etc

Not sure but engine sprocket and wheel sprocket are both stock

 

[Sidewinder Jerry]

Not sure but engine sprocket and wheel sprocket are both stock

The engine sprocket is a 10t. Different kits have different rear sprockets. Count the teeth on the rear sprocket. How do you know how fast you're going?

 

[newuser3466]

Rear sprocket is 44T

 

[DieselTech]

Could we get a few pics of carburetor orientation & your exhaust routing.

 

[Sidewinder Jerry]

GPS speedometer's aren't very accurate; a wired bicycle computer would be much better. 36 kph is around 22.4 mph meaning on 26" tires using a 10\44 the engine is turning 5225 rpm. In order for the same setup to go 60 kph which is around 37.3 mph the engine would have to be turning 8700 rpm.

Without doing some performance mods to the engine you aren't going to hit 8700 rpm. If you don't have hills and you're a small person you could try getting a smaller rear sprocket. This forum can teach you how to mod your engine for more speed.

What's more important than speed is safety. We can also teach you ways to setup your bike frame/wheels/brakes to safely handle the higher speeds.

 

[newuser3466]

Could we get a few pics of carburetor orientation & your exhaust routing.