1 cylinder intermittent firing

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Skinnybob46
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1 cylinder intermittent firing

Post by Skinnybob46 » Sun Dec 09, 2018 9:19 pm

Hello, bikes runs, new plugs, leads, coils, RH cylinder firing about 25% of the time the LH cylinder is. Any ideas??
Thanks

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500bernie
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Re: 1 cylinder intermittent firing

Post by 500bernie » Mon Dec 10, 2018 12:14 am

Hi Bob,
Have you tried swapping over the leads to see if the problem moves to the other side?
If it does then the problem is the lead or the plug cap or the connection (ht lead to coil).
If not then the problem is not ignition (spark) related as it uses a wasted spark system (both plugs spark at the same time, but only one on the compression stroke is needed).
You will need to check you are getting fuel to the cylinder and that it has compression.

Has this just started happening?

Cheers
Bernie 8)

jarno
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Re: 1 cylinder intermittent firing

Post by jarno » Mon Dec 10, 2018 11:27 am

Hello Bob,

There is a switch conected to the sidestand to prefent you starting the bike when sidestand is out.
Sometimes the switch is the problem and the Bike runs on 1 cilinder
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Garry
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Re: 1 cylinder intermittent firing

Post by Garry » Tue Dec 11, 2018 8:03 am

As a start i would try turning in the idle adjuster screw in increments on that cylinder and see if it solves the problem (perhaps the carbs
need a bit of setting up)

Could also be a partially blocked pilot jet

Good luck
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JanBros
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Re: 1 cylinder intermittent firing

Post by JanBros » Wed Dec 12, 2018 8:05 pm

jarno wrote:
Mon Dec 10, 2018 11:27 am
Hello Bob,

There is a switch conected to the sidestand to prefent you starting the bike when sidestand is out.
Sometimes the switch is the problem and the Bike runs on 1 cilinder
that's not possible. only one pickup and one coil.
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Skinnybob46
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Re: 1 cylinder intermittent firing

Post by Skinnybob46 » Fri Jan 04, 2019 10:36 am

Thanks, I've tried swapping over the leads (I know it's a lost spark but did it anyway) and have tried swapping over the carbs. Any other ideas. Spent a lot of money and time to be tantalisingly close to completion!!!!!

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