Hello, everyone

Kindly need some share about NSR 250.
My bike now running so rich, both cylinder running so rich, which so many un-burn RAW GAS out of both exhaust.
Both of spark plug also very wet & black.

Is this problem because of carburetor jetting? Or because of Crank Case middle seal?

When the bike sleep for a long time around 6 month, it will be difficult to start up using kick starter, need several kick.
The simple idea, i use power drill to rotate the magnet, than the bike start easily , first turn and started.
But if just leave for 1 day or 2 days, it is simple to start with kick starter.

also the idle are good.

My first diagnose are because of the float setting of the carburetor, because when the bike stop there are a little fuel leak from the carb bowl.
I already change the carburetor bowl seal, is this the problem? It is suppose to be the fuel not that high to reach carburetor bowl?
It is setting 13 mm for carb float.
It is possible because of fuel position too high over the carb bowl so the fuel directly got in into intake and make the fuel so rich?

For setting carburetor float , according manual are 13 mm height, is that any other option to sett the carb float decide by the fuel level on the bowl


Kindly need your share

thanks