XS 650 help needed

[Ron]

Hi all,

I have a 1980 XS 650 sidecar rig in need of some diagnostic expertise.
Cutting to the case.....it runs at idle, but will not rev beyond idle. It
just falls flat on its face. Burbles, pops, spits. The problem started
about 5 miles after filling the tank. Cleared up briefly, than reverted back
to the not running above idle. I drained the tank and put in fresh gas. I
pulled the carbs X2 and cleaned them to no avail. I replaced the CDI unit
suspecting there was a problem with the ignition not advancing. I have had a
CDI unit puke before causing intermittent problems. . I can pull either
plug wire and the revs drop, from idle, the same amount. What ever the
problem is, it effects both cylinders equally. I see a strong spark at the
plug at idle, and it weakens as I attempt to rev the engine. I have cleaned
the plugs and tried a fresh battery. Actually, I run it off a car battery
in the sidecar trunk. Coil, perhaps? Also, I do not think there is a
problem with the tank petcock. I tried running the bike with the petcock
set in the prime position. Any help much appreciated. I cannot afford to
take it to a shop, but I really would like to get the beast running again.
FYI, here is a link to pictures of the rig.
http://webpages.charter.net/clickfam/pictures.htm

Thanks,

Ron
www.mondo-ron.com

[RPG]

Have you checked the Fuel level in the carbs ?
How about the Slides, are they moving freely ?
Did you clean the emulsion tube when you cleaned the carbs ?

Post by Ron
Hi all,
I have a 1980 XS 650 sidecar rig in need of some diagnostic expertise.
Cutting to the case.....it runs at idle, but will not rev beyond idle. It
just falls flat on its face. Burbles, pops, spits. The problem started
about 5 miles after filling the tank. Cleared up briefly, than reverted
back to the not running above idle. I drained the tank and put in fresh
gas. I pulled the carbs X2 and cleaned them to no avail. I replaced the
CDI unit suspecting there was a problem with the ignition not advancing. I
have had a CDI unit puke before causing intermittent problems. . I can
pull either plug wire and the revs drop, from idle, the same amount. What
ever the problem is, it effects both cylinders equally. I see a strong
spark at the plug at idle, and it weakens as I attempt to rev the engine.
I have cleaned the plugs and tried a fresh battery. Actually, I run it
off a car battery in the sidecar trunk. Coil, perhaps? Also, I do not
think there is a problem with the tank petcock. I tried running the bike
with the petcock set in the prime position. Any help much appreciated. I
cannot afford to take it to a shop, but I really would like to get the
beast running again. FYI, here is a link to pictures of the rig.
http://webpages.charter.net/clickfam/pictures.htm
Thanks,
Ron
www.mondo-ron.com