Not Firing On Number One Pot.

vollie99

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When starting up she's not firing on number one cylinder and when she is getting warmer starts to misfire on number one and when hot it will fire nearly properly, tried changing the coils over from number three and no difference, had carbs cleaned and new plug lead on number one but no difference, can anyone help please, Mally
 

Islemann

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When starting up she's not firing on number one cylinder and when she is getting warmer starts to misfire on number one and when hot it will fire nearly properly, tried changing the coils over from number three and no difference, had carbs cleaned and new plug lead on number one but no difference, can anyone help please, Mally
How long since you've done a valve adjustment check? Tight valves will exhibit this kind of behavior.
 

vollie99

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only had the bike a year ,dont know when last the valves were checked ,thanks for getting back to me Mally
 

vollie99

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only had the bike a year ,dont know when last the valves were checked ,thanks for getting back to me Mally
Have had a compression test and they are perfect, had the carbs sonically cleaned and balanced, it's fires on all three ok, but it feels a bit uneven when cruising at a constant speed
 

Islemann

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Have had a compression test and they are perfect, had the carbs sonically cleaned and balanced, it's fires on all three ok, but it feels a bit uneven when cruising at a constant speed
Triumph triples are a unique feeling motor. There is a balance shaft that is gear driven, that gives the characteristic straight cut gear whine. They're smooth but not as smooth as an inline 4. Advantage to the triple is bigger pistons for same displacement results in greater torque across the board. When you say uneven are you speaking of a surge or what? Try to be specific.
 

vollie99

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it doesn't feel smooth as when accelerating the engine feels very smooth, when going through the gears ,not sure how to put into words Its like abit like starving of petrol,but it cant be because its getting plenty going through the gears, im baffled.
 

Islemann

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it doesn't feel smooth as when accelerating the engine feels very smooth, when going through the gears ,not sure how to put into words Its like abit like starving of petrol,but it cant be because its getting plenty going through the gears, im baffled.
Have you checked the condition of the chain and sprockets? A chain with a tight spot can give an uneven feeling.
 

vollie99

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I'm thinking it's to do with the carbs because they have started to leak fuel, finding fuel in the engine crevices and the carbs are wet with fuel, can't believe it because it's just been professionally cleaned
 

Islemann

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1999 Triumph Sprint ST
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I'm thinking it's to do with the carbs because they have started to leak fuel, finding fuel in the engine crevices and the carbs are wet with fuel, can't believe it because it's just been professionally cleaned
were they professionally cleaned _and rebuilt_? leaking float needles can wreak havoc on your motor if you should happen to hydrolock it because of fuel filling a cylinder. If the answer is yes - take it back and have them done properly as someone didn't do the job right.
 

vollie99

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were they professionally cleaned _and rebuilt_? leaking float needles can wreak havoc on your motor if you should happen to hydrolock it because of fuel filling a cylinder. If the answer is yes - take it back and have them done properly as someone didn't do the job right.
Thanks for the info, going to them of and take them back to him, he was recommended to me for his professional bike mechanics
 

Wire-Wheels

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Just a wild thought. The tachometer runs off of #1 cylinder. Can you disconnect it and see if the problem goes away ? ...J.D.
 
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