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Old 08-20-2008, 09:10 PM   #1
Jofuzzy
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anyone know old imports?

I have an old 86 yamaha Virago. It's missing really bad on the front cylinder. It just started all of a sudden one day. that morning it ran like a top then all of a sudden it was missin and back firing. Mostly when I let the engion slow me down. Sounds like a carb issue right?
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Old 08-20-2008, 09:12 PM   #2
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where did the noise sound like it was coming from?
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Old 08-20-2008, 09:16 PM   #3
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back firing like a shotgun out of the front cylinder and the more throttle it gets the better it runs as far as firing. sounds like too much air not enough fuel?
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Old 08-20-2008, 09:19 PM   #4
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single or duel carb?


but yea i think its a carb issue! poping or backfire when deceleratin,

like down shift and use engin brakeing , ?

just have them cleaned and retuned!

check your plugs and wires!
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Old 08-20-2008, 09:24 PM   #5
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carbs just got rebuilt about three weeks prior and replaced plugs and wires
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Old 08-20-2008, 09:25 PM   #6
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oh, and it's duel carb
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Old 08-20-2008, 09:28 PM   #7
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ok did they rejet?

how did they sync or tune the carbs!

my iron horse was doing the same thing but i had it rebuilt and jetted, it fixed the problem, to an extent, alot of v-twins , harley ex with carbs will pop or back fire under engin brakeing!

i still say carbs but i could not be for sure!

check you plugs , color and recheck the gap!

carb float level ex! not sure if the float level would make a diff with this but could be putting tomuch fuel in the carb , what they call loading the cylinder and then it get a backfire!

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Old 08-20-2008, 09:32 PM   #8
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I think carbs too. but ran like it was brand new when the work got done. then just stopped. what would have happen so suddenly. know any good shops that work on these old bikes/
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Old 08-20-2008, 10:21 PM   #9
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Quote:
Originally Posted by Jofuzzy View Post
I think carbs too. but ran like it was brand new when the work got done. then just stopped. what would have happen so suddenly. know any good shops that work on these old bikes/


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Old 08-21-2008, 04:29 PM   #10
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Quote:
Originally Posted by Jofuzzy View Post
I think carbs too. but ran like it was brand new when the work got done. then just stopped. what would have happen so suddenly. know any good shops that work on these old bikes/
Dirty gas can do it. A bit of stuck in a jet and your mixture is trashed. Exactly the same thing happened to me a couple of weeks ago.
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Old 09-04-2008, 04:52 PM   #11
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haha oh man I feel your pain man. I have a 99 1100 virago. They just seem to do that sometimes. Check your plugs again. Mine hates it when it gets a bit on the warm side for extended periods of time. I practice riding in a parklot with no wind circulation basically and it can get quite hot back there. It never 'overheats' but I know that it is quite on the warm side. Anyways sometimes the next day she will get some popping and sputtering while accelerating in the mid rpms.

Anywho long story short check your plugs again. Mine tend to be fouled whenever I have problems. Gas has a lot to do with how it acts. Dont buy 'cheap' gas from no name or older gasstations. Sure it may be a few cents cheaper but if you stick to places with good gas you will be saving in the long run. Also try upping the grade of gas you use. Sometimes that can solve problems on those older more 'loved' bikes.


Good Luck
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Old 09-07-2008, 08:45 PM   #12
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It turns out I had a crack in the head gaskit so it basicly had like a super shity vacume leak
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