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Welcome to the new B.I.R.D. Forum. Please be sure to read the "New Member / New Registered ? Please Read" thread in the Coffee Shop. This contains some important information. To become a full member ( £5.90 a year ) simply click on your user name near the top on the right I hope you enjoy the new site ................ Jaws ( John )
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Paddy.
Guest
How can I readily test it?
It bump starts fine, always has, but you cannot start her off the starter
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It bump starts fine, always has, but you cannot start her off the starter
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P
Paddy.
Guest
Nah, could see it with the engine cover off, all looks well in that department.
Really stuck and starting to lose patience with the bike aha.
Really stuck and starting to lose patience with the bike aha.
P
Paddy.
Guest
Not tried, will do tomorrow. Might bypass the bank sensor permanently anyway @tu*
P
Paddy.
Guest
It fired up on a bump first time, 13.88V with the lights on, revs at 5k gives me 14.5V
Lights off, 14.5V
Now, I ragged it around for a mile, came home and turned off. Won't fire off the button, just spins.
BUT
She fired once, out of nowhere, spun her over about 45 seconds in total and then bam, fired up.
No idea how, no idea why but it started. I'm leading to believe its either the starter motor (bridging the solenoid just spins it also, no boom boom) or if anyone has any alternative suggestions...?
Lights off, 14.5V
Now, I ragged it around for a mile, came home and turned off. Won't fire off the button, just spins.
BUT
She fired once, out of nowhere, spun her over about 45 seconds in total and then bam, fired up.
No idea how, no idea why but it started. I'm leading to believe its either the starter motor (bridging the solenoid just spins it also, no boom boom) or if anyone has any alternative suggestions...?
P
Paddy.
Guest
Same, just sounds like its spinning.
It's an odd one, Me.
It starts easily on the bump but will not start on the starter. Normally that would be a pointer to low battery. Starter taking too much power and not leaving enough for a good spark. In this case Paddy assures us the battery is good and the starter motor is spinning the engine up well. If it were the plugs why would it start easily on the bump? Something weird is going on! When the starter is turning it is somehow inhibiting the spark. The fuel pump can be heard priming so surely it can't be fuel.
Is there a smell of unburnt fuel when you are turning it over on the starter, Paddy?
Can you get a plug lead off and put a spare plug in it to see if there is a spark when it is turning over?
Very weird. :dunno:
It starts easily on the bump but will not start on the starter. Normally that would be a pointer to low battery. Starter taking too much power and not leaving enough for a good spark. In this case Paddy assures us the battery is good and the starter motor is spinning the engine up well. If it were the plugs why would it start easily on the bump? Something weird is going on! When the starter is turning it is somehow inhibiting the spark. The fuel pump can be heard priming so surely it can't be fuel.
Is there a smell of unburnt fuel when you are turning it over on the starter, Paddy?
Can you get a plug lead off and put a spare plug in it to see if there is a spark when it is turning over?
Very weird. :dunno:
Read the thread, Me.
Paddy has already said it just spins over except once when it caught.
Please explain why you think it would be the plugs at fault.
You have to hand it to Centaur. He can spend Paddys money and now get him to perform tricks astride few bike
How very droll.:wank:
Why.....
Have you not fitted new plugs? Does it backfire at all
Paddy has already said it just spins over except once when it caught.
Please explain why you think it would be the plugs at fault.
Well (happy to stick my hands up if wrong so put the gun down)
When the starter is pressed all the power goes through the kill switch / starter button. When button is released for a split second the plugs get the full power as opposed to it being lost via switch etc; hence my Q re backfire as that split second will be when the plugs ignite the fuel in the exhausts
Albeit kill switch is functioning how dirty are contacts etc.
How old are plugs? With continual cranking you're possibly continually fouling them.
To fire once in a blue moon from a fouled plug isn't unheard of particularly if it's had a red hot run and some of the carbons burnt away
When the starter is pressed all the power goes through the kill switch / starter button. When button is released for a split second the plugs get the full power as opposed to it being lost via switch etc; hence my Q re backfire as that split second will be when the plugs ignite the fuel in the exhausts
Albeit kill switch is functioning how dirty are contacts etc.
How old are plugs? With continual cranking you're possibly continually fouling them.
To fire once in a blue moon from a fouled plug isn't unheard of particularly if it's had a red hot run and some of the carbons burnt away
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lets just dispel a myth here...
when you press the starter, all you do is close a small current circuit that engages the starter soleniod, (this is just a fucking great big switch carrying high current) there is very little power going through the starter button at all. The main amount of current then flows DIRECTLY from the battery, to the starter motor via the starter soleniod. So a dirty kill switch will NOT reduce the amount of current flowing to the starter. its either on or off.
Bill, didn't somebody else have issues like this recently, and after a lot of toing and froing, replaced the kill switch and all was well? cracked housing with water in it springs to mind....surely the kill switch is favourite? or the sidestand switch/diode pack thingy.....dunno.
when you press the starter, all you do is close a small current circuit that engages the starter soleniod, (this is just a fucking great big switch carrying high current) there is very little power going through the starter button at all. The main amount of current then flows DIRECTLY from the battery, to the starter motor via the starter soleniod. So a dirty kill switch will NOT reduce the amount of current flowing to the starter. its either on or off.
Bill, didn't somebody else have issues like this recently, and after a lot of toing and froing, replaced the kill switch and all was well? cracked housing with water in it springs to mind....surely the kill switch is favourite? or the sidestand switch/diode pack thingy.....dunno.
Don't recall it 442.
On the sidestand switch /diode thingy that is why I asked Paddy to try sitting astride etc but if there was a problem with either of those two routes to earth then we would have Petros fault of not turning over properly.gr0n:
Loom fix?
I think that is irrelevant in this case, Me. I have the full circuit diagram and am happy to email it to you if you wish. I am trying to find a couple of hours to really study the relevant circuits, ignition and fuel pump, to see if pushing the starter button could be affecting either of those. It shouldn't but we are looking at something weird here. I would like to hear from Paddy about unburned fuel smell and possibly spark during turnover. :-0)
Basically an engine needs fuel, air and a spark to run so one of those must be missing whilst cranking. Air wouldn't change so it must be one of the other two.
I think that is irrelevant in this case, Me. I have the full circuit diagram and am happy to email it to you if you wish. I am trying to find a couple of hours to really study the relevant circuits, ignition and fuel pump, to see if pushing the starter button could be affecting either of those. It shouldn't but we are looking at something weird here. I would like to hear from Paddy about unburned fuel smell and possibly spark during turnover. :-0)
Basically an engine needs fuel, air and a spark to run so one of those must be missing whilst cranking. Air wouldn't change so it must be one of the other two.