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ViragoTechForum.com XV700 Rear Cylinder not firing (all the sudden) (SOLVED)

#1:  Rear Cylinder not firing (all the sudden) (SOLVED) Author: sicksgun Post Posted: Mon May 10, 2010 2:15 am

So I have an 86 700 and she runs amazingly. absolutely love it. Then yesterday I filled up on gas after work, headed to my house, stopped for tacos before I go cruising through the canyons. I get my food hop on my bike, start her up.......... and man Ive never heard a bike sound so bad!! Firing only on the front cylinder with some sort of whistling noise. out of nowhere!!!!!!! So I put it home and check all my connections and pulls the plugs. Aside from a little carbon they seemed okay. replaced the plugs today hoping for a quick cheap fix to no avail and upon closer inspection i notice that my battery is leaking electrolyte on my muffler causing corrosion. I don't see any contact with wires but while tracing the problem up to the coils I found that the idiot who had the bike before me tried to affix a new horn to the bike by screwing it onto the housing of the ignition coils and screwed directly into the coils themselves. I've had the bike for a few months and it's ran great until now. I mean it cooks like it's brand spanking new and I turn it off after running it for fifteen minutes and all the sudden it has this problem. About to dive in head first with cleaning and taking my battery in for service tomorrow. anyone have any tips for me before I get in over my head?

Thanks
Jesse 1986 Virago 700


Last edited by sicksgun on Sun May 16, 2010 1:40 am; edited 1 time in total

#2:  Re: Rear Cylinder not firing (all the sudden) Author: mark75 Post Posted: Mon May 10, 2010 2:58 am

bad battery can will make it run crappy.

slap an extra ground to bare frame, also one on the reg/rec wouldn't hurt either.
make sure all the electrical connections are clean and tight.

look around and see if there is anything else obvious the PO buggered.

when you get your new battery put a volt meter on it. should be ~ 14.3v @ ~3000rpm.
if you're <13v or >15v your reg/rec is pooched.

#3:  Re: Rear Cylinder not firing (all the sudden) Author: coalstoves Post Posted: Mon May 10, 2010 10:13 pm

I think servicing the battery is a good thing to start with but if its running on just one cyl then ya need to determine it is a fuel or spark problem

#4:  Re: Rear Cylinder not firing (all the sudden) Author: club_c Post Posted: Mon May 10, 2010 11:04 pm

Whistling? Seems like maybe a vacuum leak. I'd be checking the vac lines and carb mounts.

#5:  Re: Rear Cylinder not firing (all the sudden) Author: grazingazer Post Posted: Tue May 11, 2010 9:44 am

check for a loose spark plug it'll kill a cylinder and cause whistling

#6:  Re: Rear Cylinder not firing (all the sudden) Author: bstig60 Post Posted: Tue May 11, 2010 12:00 pm

Whistle could be a blown head gasket or a vacuum leak. Check fuel and spark and then run a compression check.

#7:  Re: Rear Cylinder not firing (all the sudden)solved Author: sicksgun Post Posted: Sun May 16, 2010 1:42 am

thank you all for your help. turned out that when my bike backfired it popped the rear carb out of the manifold. just popped it back in and she runs great

#8:   Author: club_c Post Posted: Sun May 16, 2010 2:14 am

Did I say that? I thought I said that.
ViragoTechForum.com XV700 Rear Cylinder not firing (all the sudden) (SOLVED)


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