more top end speed after run in

will my 70cc happytime motor gain more top speed after run in cauce i have done 50km and it can only get up to about 40km?? Could it could be cauce i am not getting enough air into the carby?
Thanks

I have had kits that ranged from 25 mph (40 kph) to over 35 mph (60 kph).

A lot depends on the engine, which intake it has, how well the ports are matched, what type of muffler, ect.

Most all of them can be made to run 50-60 kph with a little work.

Break-in does help, but I think a lot of it is due to "tweaking the engine and components" during the break-in period.

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If it ain't broke, and you mess with it long enough, it will be.

How is your mixture? What color is the plug?...that's where I'd start.

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If it ain't broke, and you mess with it long enough, it will be.

well i am running 20 to 1 and the plug is a nice brown colour!!

You'll get a little more power and maybe speed if you go to 24 to 1, or even 30-32 to 1 synthetic oil.

How's the break-in going? Has it picked up any speed yet?

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If it ain't broke, and you mess with it long enough, it will be.

i noticed a big difference in out-of-the-box power, between bushing and bearing motors.

bushing motors were quick from the start, but bearing motors dont achieve total power until you're into the third tank.

its a new motor. everything's tight, and the rings havent seated yet.

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well when i first got it, it had a bit of power but no top speed so i drilled some holes in the carby filter cover and that made a bit of a different to the top speed but it seems to be not getting enough air.
Like when i ride i can put it full and it will get up too a speed and then the exhaust will make a vibration noise and it just wont go no more.

Thanks

Have you checked your motor mounts? It is possible the fuel is foaming in the carb due to lose mounts or excess vibration.

well I have rubber between the frame and the mounts,and it is a smooth to ride.

Thanks

Sound like it is going into a four cycle when it "gets there". Try a leaner carb setting. (one notch up on the needle.)

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If it ain't broke, and you mess with it long enough, it will be.