hi there fellow riders i need help my mc 21 250 r wet clutch version when i start the bike it starts ok but the front cylinder dosent seem to fire well i belive the spark is good but fires intermititly not very well at all ok so now the bike warms up a bit then it just wants to rev to 11000 rpm on one cylinder the back one at the same time the front cylinder will fire once and a while and also will back fire but i think thats from excess gas not burning off i turn off ignition it still runs until i bump the throttle a few times then it will die it wierd please help thanks alot brent
What do the plugs look like? Have you checked compression. _________________ james
Its not how fast you go...Its how you go fast.
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Ever heard of punctuation Brent? _________________ MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
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Sounds like the carbs could do with a service. When did you last strip and clean them? Has it been stood at all? _________________ MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball
In all seriousness though Brent, it does make it a bit hard for our non-English speaking friends to follow!
Everyone... please just take a few moments to read back through your posts, and think about whether it would make sense to you if English wasn't your first language!! Some of the posts lately have been hard enough to read when English IS my first language!! _________________ Andy.
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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.
ok! sorry for the bad grammer. thanks for the input. but can anyone tell me why the engine wants to rev so high when the throttle is closed.and i turn off the ignition it still runs until i bump the throttle. thanks brent
Could be running quite lean, and very hot, causing pre ignition - I have heard of this before, but usually a 2 stroke will self destruct when this happens.
As I asked, has it been stood? Have you serviced the carbs recently? _________________ MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball
Lucky you guys dont speak straryeun (read : Australian ). Merg every 2 words together, replacing t's with d's whilst removing the first 2 letters of each word, and add the word mate every 7 words.
Is it just me, or is it not possible for a engine to rev to 11000 rpm with a shut throttle ? Where is all the air coming from ? Im sure if the boffins on here (no insult intended) calculate how much CFM is needed for this engine to rev that high, it would show its not possible with the slide shut. _________________ Winning isn't everything, but loosing isn't anything
That's why i asked about the carb service - may have a trapped cable somewhere for starters, let alone an improperly fitted carb rubber... _________________ MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball
ok yes i did the jets. cleaned bottem end of carbs. floats to cleaned and blew through jets. was alot of crap in there. the airbox is not on there because im missing the peice on the bottom for the hose from the clinoids the 3 way connector to the airbox. but i heard its mostly for midrange.it shouldn't affect the ildle ? right? . i need to test for air leak and compression but i dont think its compression. and the slides are closed when it revs. i think your right its an air leak. i need to check all tonight i will get back to you with results and go from there. thanks all for all your help! any other ideas are surley apprecated!! thanks again brent
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