Hi. I have a NSR250 MC18. Sothing very weird started a few weeks ago. It was obvious the right side pipe had no fire and the power was non-existend. Took it to workshop, they replaced sparkplugs and cleaned the fuel line. Afterwards is was fine for a few days. Now the left side is dead / no firing.... I've check the plugs are there are spark. Can this again be insufficient fuel to the other side? Any ideas will be appreciated.

Many thanks

try going round the wiring loom and cleaning all the pins to and from the ignition system as it sound like they mite be blackened or corroded then put a small amount af vaseline on the pins

also check that the carbs are clean nothing is blocked

Definitively not spark related! I'll check the tank breathing. The one side in completely dead. I'll check the fuel pipes to the carb. Thanks for advise thus far, much appreciated.

it there compression in the bad side ?

Yes. Compression is good!

were are you in the world ? because ive read that there has been some dirty fuel going about

I'm following up on a tip that the spark plug (BR9ECM) may cause problem even if it seems like firing (outside the head). Maybe its just Murphy this time around

i have had plugs go bad but sounds like fuel to me mate is the plug wet ?

Hi. Long shot but I think I may be onto something. Opened and cleaned the carbs again, changed plugs and generally cleaned stuff. Got everything together earlier and guess what, the left side is dead (the right side was dead).... Again I checked plugs and fire, all fine. I then got a brainwave and opened the bottom drain bolt, and only a few drops of fuel came out!!! Both carbs were almost completely dry. I tried blowing air into the intake and couldn't. I realized it could only be the floats. Removed the carb, opened the bottom and saw that the float valve was stucked. Removing it, I can clearly see some dents and scratches (here and there rough edges). The other side more or less looks the same. I'm pretty sure that this may cause this one side then the other side "dead" story, sticky float valves. Do you think a would still be able to get spares e.g. float valves and seats? Lastly, do you adjust the float levels?

Probably don't need new parts, just a good clean. Float heights are important and I think Andy has something on this in his techy section.

Hi. Where can I find that section from Andy?

HERE OR HERE

Hi. Nope, nothing there about float settings...

Yes there is...
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If I have to take the carbs off once more...