RE: [Virago] Backfiring problem on 1985 Virago XV700

["Massaad, Michel" <Michel.Massaad@xxxxxxxxxxxxxxxxxxxxx>]

I don t think he did but I put the B12 in the tank everytime I fill it.
I think it is either is a air/gas mixture problem, or electrical problem that prevents from burning the gas in the cylinder.

Any suggestions on how to differentiate the two?

Thanks a lot

Michel


-----Original Message-----
From: virago-bounces@xxxxxxxxxxxx on behalf of Dan O'Quinn
Sent: Tue 8/28/2007 5:58 PM
To: Yamaha Virago Motorcyle Discussions
Subject: Re: [Virago] Backfiring problem on 1985 Virago XV700
 
did he clean and de-gunk the gas tank?
if not your clean carbs could be dirty again

----- Original Message ----- 
From: "Michel Massaad" <michel.massaad@xxxxxxxxxxxxxxxxxxxxx>
To: "Yamaha Virago Motorcyle Discussions" <virago@xxxxxxxxxxxx>
Sent: Tuesday, August 28, 2007 5:42 PM
Subject: Re: [Virago] Backfiring problem on 1985 Virago XV700


> Thanks for your reply Jeremy.
>
> It happens totally randomly.
> I had the carbs cleaned and synchronized by a mechanic so I suppose that
he
> tightened all the screws... I really have no experience with this.
>
> Sometimes if the choke is on it work well but then it does it so I cannot
> know if the choke helps or not.
>
> What is the LH case cover? I could try opening it and look at the wire.
>
> Lately it gave some black smoke which make me suspect poor ignition or
that
> it is running rich. When I changed the spark plugs they were black. I will
> look again to see if this is happening again.
>
> When I brought it from the mechanic he said that he cleaned the air filter
> but I will look again.
>
>
> Thanks for your suggestions again.
>
>
> > From: James J Schneider <jjschneider@xxxxxxxxxxxx>
> > Reply-To: Yamaha Virago Motorcyle Discussions <virago@xxxxxxxxxxxx>
> > Date: Tue, 28 Aug 2007 13:46:24 -0700
> > To: Yamaha Virago Motorcyle Discussions <virago@xxxxxxxxxxxx>
> > Subject: Re: [Virago] Backfiring problem on 1985 Virago XV700
> >
> > "I have a 1985 Viarago XV700cc. When I bought it it wasn¹t running so I
had
> > the carbs leaned and synchronized, and the rubber manifolds changed. Now
it
> > runs on and off: It runs smoothly then suddenly it starts backfiring
from
> > everywhere and lose power completely. It take me some time to start it
> > again then it runs OK, until it does it again."
> >
> >
> >
> > Does it go batty at a specific condition, such as a given rpm or
throttle
> > opening?  Or is it totally random?  First I'd suspect some crud loose in
> > the carbs, especially if it has sat for any length of time without
running.
> > If not that, ignition - maybe a loose connection, maybe a bad TCI.
Could
> > just be corroded connections at the TCI.  OR - I just remembered this
> > happened to me - it could be the four pickup wires coming out of the top
of
> > the LH case cover. Some of the insulation was damaged on mine.  Does
your
> > tack freak out when the problem happens?
> >
> > Jeremy
> >
> >
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>
>
>
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