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

The best approach is to start by using the search on the forum for battery, leakdown testing, compression
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Why do things simply when you can complicate them

Hi,
I have known the crankcases to fill up with fuel that has leaked past the float valves and run into the engine.
You should always switch the fuel tap to off position when storing the bike.
The easiest way to check for fuel in crankcases is to remove the carbs and reed valve block and look inside?

The carb's may need a complete overhaul and possibly the fuel tap is leaking past in the closed position.
Regards
Ian

I always turn off my fuel tap when the bike is not running. I put my bike on a paddock stand when it's in the garage. I found the floats shut the fuel off better. I also replaced the fuel tap and float valves. The float heights need to be setup well. Too much and they flood. Too little and they run low on full throttle
_________________
Why do things simply when you can complicate them

mreebikes wrote:Hi,
I have known the crankcases to fill up with fuel that has leaked past the float valves and run into the engine.
You should always switch the fuel tap to off position when storing the bike.
The easiest way to check for fuel in crankcases is to remove the carbs and reed valve block and look inside?

The carb's may need a complete overhaul and possibly the fuel tap is leaking past in the closed position.
Regards
Ian

That happened to me, couldn't start the bike because it was hydrolocked!! Turned out to be the float heights were slightly out. Also worth noting that the overflow pipes can be fragile in the float bowls, so take care whilst cleaning around them or you'll snap one off like I did!

Dear, Guys

Thanks for the post

Kindly found the problem with my bike.

Yes, like it or not it is the crank seal issue.

No problem with the carb

Looks like need to spare money again for the bike

Regards