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one cylinder backfiring

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one cylinder backfiring

PostAuthor: dukeaholic » Mon Oct 23, 2017 8:00 pm

Hi, my 84 1000 all of a sudden started to backfire in the front cylinder when reving but the rear cylinder is working fine. i thought maybe the plug was gone but i put both new begining of this past summer. i replaced the front one anyway to see if it would fix it but it didnt. i then drained the the carbs but now the front cylinder isnt firing at all now.

what could my issue be? Thanks for any input.

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Re: one cylinder backfiring

PostAuthor: bstig60 » Mon Oct 23, 2017 11:17 pm

Was it backfiring thru the exhaust or the carb? If it was the exhaust, it is getting too much fuel and the raw fuel is igniting in the exhaust due to the heat. If its backfiring thru the carb, it is running too lean. Could have been a stuck float.
Bill
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Re: one cylinder backfiring

PostAuthor: dukeaholic » Tue Oct 24, 2017 10:28 am

it backfires out the exhaust when I try to review it but I can also hear it in the carb at idle.

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Re: one cylinder backfiring

PostAuthor: mark75 » Tue Oct 24, 2017 1:53 pm

check your vac lines are still soft - not cracked, also the carb manifolds. [some have o-ring seal that splits]

and as always make sure the battery is fully charged.
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Re: one cylinder backfiring

PostAuthor: dukeaholic » Tue Oct 24, 2017 7:55 pm

Thanks, i will check out a few of the things u guys listed on the weekend. not god at checking carbs tho. lol a friend of mine suggested that the carb may be the issue but i did notice a rubber hose conecting to the coil cover all cracked.

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Re: one cylinder backfiring

PostAuthor: dukeaholic » Sun Aug 05, 2018 8:37 pm

well I cleaned the contacts on the front coil and it ran flawlessly. then a few days later it started to backfire again. now it runs on both cylinders but has no power. wold it be the cdi or the coils going?

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Re: one cylinder backfiring

PostAuthor: bstig60 » Mon Aug 06, 2018 11:52 am

Did you check the vacuum lines as suggested, a vacuum leak can cause this symptom. If the vacuum line you mention was cracked, did you replace it? That goes to the pressure sensor mounted by the coils.
Bill
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

Please take the time to edit your profile to show your location. City, State/Province and Country. It is easier to help you if we know where you are.

SERVICE MANUAL DOWNLOAD LINK
http://viragotechforum.com/viewtopic.php?f=220&t=31501#p279545

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Re: one cylinder backfiring

PostAuthor: dukeaholic » Tue Aug 14, 2018 6:20 am

I will check it again. I will replace it right out.

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Re: one cylinder backfiring

PostAuthor: thaibiker » Sun Dec 09, 2018 4:11 am



Hello and Greetings from Thailand,


I've just bought a Virago 1100 cc two months ago and had to repair quite a lot of things that were messed up by a Thai mechanic. I had a similar problem and one cylinder was sometimes gone. After checking the spark that wasn't really at the electrodes of the spark plug, it was clear that it was an ignition problem.

I'm very thankful for the time I did some troubleshooting and worked for Bosch. I took pout my coils, but one after the other and checked the contacts, wires and I finally found a deep cut in the front cylinder's spark cable! It was right at the coil where the cable comes out, so you couldn't see a spark when it was dark.

I'd also make sure that the two cable connector that runs from the pick up to under your seat has a good contact. I'd assume that the bike's running again, should you read that, please report back what it was.

Cheers- Mike

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