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+--- Thread: Sudden misfire and its not due to rain (/showthread.php?tid=59779)
Re: Sudden misfire and its not due to rain - Fazerider - 10-08-12
If it's not electrical, a good next step would be to run the engine for a moment (or at least try to) then whip the plug out.
If it doesn't smell of fuel it's not getting enough which would suggest a blocked jet or supply pipe.
On the other hand, if it's soaked in fuel that would point to a stuck float, duff choke plunger or a jet that's way out of adjustment.
Re: Sudden misfire and its not due to rain - red98 - 10-08-12
(10-08-12, 10:55 AM)Fazerider link Wrote: If it's not electrical, a good next step would be to run the engine for a moment (or at least try to) then whip the plug out.
If it doesn't smell of fuel it's not getting enough which would suggest a blocked jet or supply pipe.
On the other hand, if it's soaked in fuel that would point to a stuck float, duff choke plunger or a jet that's way out of adjustment.
yes as above.....its either sparks or fuel.....when was the last time the carbs were cleaned / balanced
Re: Sudden misfire and its not due to rain - Bracechenko - 10-08-12
(10-08-12, 11:14 AM)red98 link Wrote: [quote author=Fazerider link=topic=4131.msg34198#msg34198 date=1344592538]
If it's not electrical, a good next step would be to run the engine for a moment (or at least try to) then whip the plug out.
If it doesn't smell of fuel it's not getting enough which would suggest a blocked jet or supply pipe.
On the other hand, if it's soaked in fuel that would point to a stuck float, duff choke plunger or a jet that's way out of adjustment.
yes as above.....its either sparks or fuel.....when was the last time the carbs were cleaned / balanced
[/quote]
The carbs were balanced 2 mths ago but i've not cleaned them before. However, the bike has been used daily and hasn't sat for any length of time.
The way it happened so abrubtly (ie, bike runs fine, fill with petrol and start on 3 cylinders) makes me think that it was an ignition failure or some crap blocking something. Guess it's likely the crap now so i'll start investigating when I get time
Re: Sudden misfire and its not due to rain - red98 - 10-08-12
try draining the carbs and see what you get......quick and easy to do and might give you a clue
Re: Sudden misfire and its not due to rain - Bracechenko - 10-08-12
(10-08-12, 02:33 PM)red98 link Wrote: try draining the carbs and see what you get......quick and easy to do and might give you a clue
Little screws at the bottom of the carbs yeah?
Re: Sudden misfire and its not due to rain - red98 - 10-08-12
thats the ones
Re: Sudden misfire and its not due to rain - Bracechenko - 12-08-12
Ok so those screws are seized solid and started to round so i cant drain the carbs. I did notice today though that on turning on the ignition i didnt hear the fuel pump clicking like i normslly would do after a few days standing still. Maybe thats because the fuel was fully primed whilst i was checking the plugs on thursday? Fuel pump maybe?
On a separate note, does anyone have a diagram of which HT lead goes to which plug? 1 and 2 are fine but ive lost the numbers for the other 2 and dont know if i have it right!
Re: Sudden misfire and its not due to rain - darrsi - 12-08-12
Believe me, you will know straight away if you have your HT leads crossed over, and so will your neighbours, i've done that myself before :lol
Can someone be a bit more descriptive on draining the carbs please as it's something that i've never done before but it was suggested to me to do the other day? :rolleyes
Re: Sudden misfire and its not due to rain - Bracechenko - 12-08-12
Ht lead order now correct. Anyone fancy a stab at my fuel pump question?
Re: Sudden misfire and its not due to rain - CRH - 12-08-12
chk the filter brace!....very rare for fuel pump to pack up!! and i think it wouldnt run at all if that was down??....and like you say it appears to just be one cylinder down!!! :rolleyes
Re: Sudden misfire and its not due to rain - Bracechenko - 12-08-12
(12-08-12, 07:49 PM)CRH link Wrote: chk the filter brace!....very rare for fuel pump to pack up!! and i think it wouldnt run at all if that was down??....and like you say it appears to just be one cylinder down!!! :rolleyes
Oh yeah, forgot to mention that it doesnt run at all now! I'll check the filter but shouldnt i always hear the fuel pump click when turning on the ignition if its been left for a day or so?
Re: Sudden misfire and its not due to rain - CRH - 12-08-12
well?....yes! try leaving ig on and tapping it? ....mabe just sticking or bad connection ...or if it is foooked?...then ebay!!!! :rolleyes
Re: Sudden misfire and its not due to rain - CRH - 12-08-12
just a thought???????.....you have put your ...kill switch to ..run havnt you!!!!!!!!! cus that will stop pump running!!
Re: Sudden misfire and its not due to rain - red98 - 12-08-12
ah........so its not working at all now :rolleyes are you still getting a spark at the plugs
Re: Sudden misfire and its not due to rain - red98 - 12-08-12
(12-08-12, 08:04 PM)CRH link Wrote: just a thought???????.....you have put your ...kill switch to ..run havnt you!!!!!!!!! cus that will stop pump running!!
you might be able to bypass the pump and let good old isaac help you out with that gravity thing he invented,take the two tubes off the pump and join them together,should work,if it runs you have a problem with the pump,try crh`s tip first by tapping the pump
[size=78%] [/size]
Re: Sudden misfire and its not due to rain - Bracechenko - 12-08-12
Still got a spark and will give the pump a whack tomoz whilst checking the kill switch! Need to sort it as my shiney FZ1 is clocking some grubby and boring commuter miles :'(
Re: Sudden misfire and its not due to rain - CRH - 12-08-12
......bugger!!! :rollin
Re: Sudden misfire and its not due to rain - Bracechenko - 12-08-12
Just quickly checked the kill switch and its fine. Tapped the pump lightly with a screwdriver but no change. I'll still take a closer look tomoz tho, so annoying!
Re: Sudden misfire and its not due to rain - CRH - 12-08-12
mabe reds suggestion of linking pipes and letting gravity do its job would be worth a try brace??
.....
Re: Sudden misfire and its not due to rain - Bracechenko - 12-08-12
(12-08-12, 09:37 PM)CRH link Wrote: mabe reds suggestion of linking pipes and letting gravity do its job would be worth a try brace??
I'll give it a shot but wouldnt it need pressure to fill up the carb bowls? Ah well, i'll try it tomoz anyway
