Carb help

[rickann]

Hi,

I've recently bought a 92 Suzuki TS125R. The bike starts and runs smooth up to about 4500 revs, but won't rev above 5000 where it runs really rough, it’s also quite Smokey all the time (white-ish smoke).

If I turn the petrol of at the tap and let the fuel run out just before it runs out the bike runs great, right up to the redline (No smoke either).

I Striped and cleaned the carburettor but it was no better, did notice the emulsion tube might be slightly worn (float level ok).

Is this likely to be carb related or what could cause this electrically.

Any help will be appreciated as I know very little about bikes.

Cheers,
Ricky