intermittent misfire

SVR Himalayan

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razor1988
I've got myself a real annoying misfire that seems to happen with out rhyme or reason.

I first noticed it a couple weeks ago when it happened out of the blue coming out if a slow courner at about 3000rpm.

I figured I'd change the plug to a iridium plug as I've heard good things about using them.

thought my troubles where gone till I got another stumble as I was going to over take a car 😳 this time it was at 4000rpm.

it doesn't seem to happen at any particular Revs or throttle position and i have now I've experienced a mis a handful of times in the last few of rides.

has anyone else experienced anything similar? it is so infrequent I could live with it. but concerned what it may be doing to the engine? thought it could be because of moisture after washing the bike but the stumble happened when bikes been dry for a few days.
 

Roy Gavin

Well travelled
Yep , always worth a check, as was the condenser in a points system.
On another bike there was a crack in the carb to head rubber tube which like dud leads was sensitive to vibration frequency --!
Plug leads, caps and condensers are actually service items, but the only guys I ever knew who changed them were plant fitters servicing our own equipment!
 

SVR Himalayan

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razor1988
Thanks ill take a look at the lead and see if I can find anything fishy around the coil.

I took the bike out for a ride today did about 60km without a hitch till... I got onto so gravel roads and got 1 blip. then nothing to report for the remaining 30km.

Think I can rule out moisture the last 15km was very very very wet. 😅
 
Thanks ill take a look at the lead and see if I can find anything fishy around the coil.

I took the bike out for a ride today did about 60km without a hitch till... I got onto so gravel roads and got 1 blip. then nothing to report for the remaining 30km.
the gravel road tells me it could be a loose connection somewhere, just like when the side-stand switch is faulty and kills the engine, there may be a wire or connector somewhere that is making intermittent contact or is greasy
 

SVR Himalayan

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razor1988
the gravel road tells me it could be a loose connection somewhere, just like when the side-stand switch is faulty and kills the engine, there may be a wire or connector somewhere that is making intermittent contact or is greasy
I tough that too, but it has misfired on road a couple of times too.
 
I've also had misfires when water (either in the gas or via condensation in tank) momentarily causes a stumble. Dirty gas or contaminants can also be responsible. Both of these would be random. I believe there is some partial assembly of the bike when it reached the destination country and during the process a wire or connector to be the problem. Last, the connectors used sometimes appear to be completely plugged in, but are not "snapped" into place. That could also cause intermittent misses.
 
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