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misfire


mr1
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Welcome to the Forum mate....... 8-) Why not introduce yourself when you get a mo...... :)


What sort of misfire? Is it when revving high.....or when pulling from lower revs?


My immediate thought is Coils/Coil Pack depending on what is fitted to your bike.........could also be fuelling....fuel injected or Carb?


Give us a bit more info on the misfire and what your bike is running (Carb/FI...Aftermarket exhaust....etc) and we'll see if we can help you out...... :)

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Hi,my names mark,my bike has carbs an after market can but always did have before the misfire,it misses from low down the revs but once I rev it hard seem to disappear

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sounds like a coil breaking down once it warms up to me!

 

Damn you Stu......I did all that typing and you beat me to it....... :lol: :lol:


Yep....I agree with Stu......my money would go on a coil breaking down..... :wink:

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I would still only do the one


They aren't sided so you can just get one and try it on each side unless they have fixed wires and lengths then you need to find out which side it is


You can usually tell by plug colour

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Thanks guys,just found some on the internet 70 quid for the pair,so gonna just replace both,they don't come with plug caps tho do you think I should replace those as well :-)

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Funny....but my car was in for a service and MOT today....and they've upgraded the coil packs because of misfire issues with these cars.....exactly as OP experienced on the bike.....low rev misfire...but OK when revved.

£70 a pair is reasonable.....but maybe change the caps and leads as well if they aren't too expensive....just to save any possible future trouble.....prevention is better than cure...... :wink:

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  • 3 weeks later...

Hey peeps,just fitted my new coils and still no better,in fact seems a bit worse,does any know what spark plug caps I need can't seem to find them anywhere on internet,getting proper stressed :-(

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oops, I deleted my post after you replied! :oops: caps are cheap, about £3 or £4 usually. you can find out what cap you need on the ngk website, you just need the part number of your spark plug which is usually printed on the white porcelainn :thumb:

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  • 2 weeks later...

Hey fella's thanks for all the info,fitted new plug caps and only slightly better,a mechanic mate suggested stripping down the the carbs,any more suggestions would be welcome as I'm not sure if that's beyond my capabilities lol

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You did swap the spark plugs when you did this didnt you?


Also if coils go they can sometimes break the ECU as has happened across a couple of bikes. So i'd replace that as a matter of course :thumb:


Cheap one can be found on ebay

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thanks fozzie,yeah I did change the plugs,going to get an ecu,but before I do I'm gonna change air filter as hasn't been done since I've owned the bike that's about 4 years lol,also its been sitting all winter with only a small amount of fuel in it so gonna empty that out and put in some fresh juice,just so bloody cold at the mo and I ain't got a garage :-(

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Right chaps,I have fitted new coils,spark plugs and caps,new air filter,bike is much better but not perfect,it ticks over and rides fine warm or cold,did fifty odd miles this morning and ir only misfired a couple of times,I'm now well stumped :|:| ol yeah I spoke to a mechanic and he said if the ecu/cdi unit was at fault the bike probably wouldn't run :/

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