Hallo to you all
My bike is NSR250r mc21 de-restricted and the rest is standard!
I have problem with lower cylinder it works (almost good) but it misses to fire every time and less smoke is coming from pipe. Upper cylinder is working beautifull!

I swap coils and put new plugs but it is same!

Did anyone have same problem? And what to look for?

Thanks

'Misses to fire every time'

Not sure what you mean AGV, can you explain some more?

Where in the world are you by the way - we like to know these things!
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

hey AGV...i am havin the same sort of trouble atm..

my lower cylinder is not workin aswell.

checked my sparks.they are ok.
checked/cleaned the carbs.they seem ok too.cloat needle etc closes everyhtin off nicely..

but i did find out that(if u read my topic "first run") taht the oil pump seal is out of place/damaged. maybe the same thing for you??dunno if this is related to my lower not firing good..but i think it maybe.i think i can see oil leaking from the lower exhaust port also so....

cheers
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Philip Ahn
MC21 NSR250R

im poor...

biatchy wrote:cloat needle etc

Excuse me?
What does "cloat" mean?
Do I have a "cloat needle"?
Do I need one?
Do they help eliminate detonation?
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

haha sorry..typo...
i meant "float needle"
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Philip Ahn
MC21 NSR250R

im poor...

biatchy wrote:haha sorry..typo...
i meant "float needle"

Come on Biatchy, now we've sorted the spelling, where's yer capitols?
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

lower cylinder works but not good as upper one!
allmost cold air is coming from pipe and you can tell by sound that it does't fire every stroke for some reason!
What it could be??

yo..AGV..u r in melbourne too! where abouts?

yeha the lower cylinder isnt firing at all then i think...same as mine.
read over my other topic...might be of use to u...

cheers
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Philip Ahn
MC21 NSR250R

im poor...

[RANT]

OK, Dave has made a point of this only this morning. Start using the appropriate grammar and spelling, or modifying will take place - imminently.

By modifying, I mean I will delete posts, not waste my time editing them.

We've asked politely, now be told.

[/RANT]
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Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

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AGV, my suggestion would be to look very closely at the connection at the coil of the troublesome cylinder. If there is a poor connection there between the blades of the coil and the wiring harness connectors, that can cause misfires (speaking from painful experience here, and yes, I always now think all misfire problems are like mine, but one of these times I've got to be right! ). If you see any signs of pitting or blackening on the coil blades, this may be your problem. If so, try cleaning the blades and inside the female connector with a sliver of emory board or something, and then make sure when you re-connect the coil that it is a snug fit. I ended up just replacing the female connectors and was shocked at how much tighter the coil fit, rather like trading in the wife for .....oops, mind wandered to the gutter there for a moment, sorry. Anyway, I hope that helps (or at least gave a nice image).
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-Jim
'93 MC21

Jim wrote:...try cleaning the blades and inside the female connector with a sliver of emory board or something...

Been in the wife's toolbox Jim?!
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

Well, yes, now that you ask, but not as often as I'd like....which probably explains my preoccuption with coitus, er, coil connections!
_________________
-Jim
'93 MC21

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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

Thanks Jim and biatchy!

I found out lower cylinder does't work in netrual at all,but it starts to fire when i open throttle so
Could it Carbs or something to do with oil?

AGV & biatchy; did you guys find a fix?
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Jerry Lai
NSR250 [MC21SP]