not running right on all 4..

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DK-Tandy
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not running right on all 4..

Post by DK-Tandy »

so yeturday i was fiddling with my bike preventing the rattle at 4k to 6k revs. so i put it all together then dropped it.. i say dropped it, it fell over the other way and i placed it on the floor as i had the strength the lower it slowly but not enough to pick it up from a 35degree angle.. i then picked it up as you do and started it to see if i had stopped the rattle..

it wasnt running on all 4 cylinders

as you sit on the bike, cylinder 3 was working.
i took it for a whiz around the block and yippee, the cylinder had kicked back in and it was working, it then ran like a dream all night..

come to go to work today and it was only running on 3 cylinders again.. i presume is was 1 2 and 4. Got about .1 km up the road and i could feel a change as like the cylinder had kicked back in :)

done my shit shift at work and started the bike up to come home..

running on 3 cylinders. i limp the bike home (it wont tick over) and got a wet sponge and put it on my headers..

3 and 4 make the sponge sizzle and they evaporate the water quickly. cylinder 1 and 2 just evapourate the water but without the sizzle telling me theyre not as hot as the other cylinders..

what can i do to resolve this problem?
Delboy
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Re: not running right on all 4..

Post by Delboy »

Are the HT leads on tight? give em a push on the spark plug end (looking for cheap fix 1st)
4 WHEELS MOVE THE BODY 2 WHEELS MOVE THE SOUL
DK-Tandy
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Re: not running right on all 4..

Post by DK-Tandy »

i pulled all HT's off and refitted and its working now :D
Delboy
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Re: not running right on all 4..

Post by Delboy »

Nice one Dan ;)
4 WHEELS MOVE THE BODY 2 WHEELS MOVE THE SOUL
DK-Tandy
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Re: not running right on all 4..

Post by DK-Tandy »

with an I4, when on tickover should certain headers get hot?? i found its running on 4 cylinders but only 1 and 4 make a wet sponge sizzle, the middle 2 dont? is that right for tick over??
tanuki
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Re: not running right on all 4..

Post by tanuki »

No they should all be the same temperature.
DK-Tandy
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Re: not running right on all 4..

Post by DK-Tandy »

what would cause the inner 2 to not run as hot as the others??
Wozza
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Re: not running right on all 4..

Post by Wozza »

Either a weak spark or fuelling is off. The latter could be a partly blocked jet, incorrect float heights, or simply the carbs need balancing. I would check the sparks, then balance the carbs if they've not been done for a while.
DK-Tandy
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Re: not running right on all 4..

Post by DK-Tandy »

ive tried many different tools to remove sparks, i cant find a tool that will go all the way down and i dont exactly have the money to throw around to afford one..

the other day when it was running on 3 cylinders all the working ones were at same temp, but since all 4 work, 2 dont :(

is it bad to use the bike in its current state?
DK-Tandy
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Bike owned: CBR400RR NC23
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Re: not running right on all 4..

Post by DK-Tandy »

will adjusting the tick over screw on the side affect the heating of my headers..?

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