79 gs850 running on 2 cylinders

[blazinnate]

hello all, i'm quite confused by this problem. i've been having charging issues with my bike, thought i had it fixed, and rode it all weekend no problems. i went to ride it yesterday and still had charging problems, but up until then, the actual bike ran great. today i went out to start it, and all of a sudden the right 2 cylinders don't seem to be firing. i'm thinking the compression is good, because its still spitting out cold puffs of air from the right tailpipe. i checked the spark on the outside cylinder, and i am getting spark, so where should i start? like i said, last time i rode it, it ran great. anyone have any ideas?

[Gonzo]

Bad compression on these bikes can be as high as 100psi honestly. I'd say that's more than enough to blow a puff or two out the pipes.

Fuel, spark, compression. You need those for a runner. check to see if your plugs are wet with fuel, if they are, pull the plugs, ground and check for spark, and then if you have that, lastly I would grab a compression gauge and do that check. That should give you an idea of what road to start heading down as far as trouble shooting.

[Big T]

We need more history

Did you clean your carbs?

Check your valves?

It sounds like rust or crud has gone into the #3 and #4 carbs, Try draining the gas out of the float bowls into a container and see if there's crud in it

Rust in the gas tank?

Vacuum line came off?

[blazinnate]

We need more history

Did you clean your carbs?

Check your valves?

It sounds like rust or crud has gone into the #3 and #4 carbs, Try draining the gas out of the float bowls into a container and see if there's crud in it

Rust in the gas tank?

Vacuum line came off?

well i was looking for a place to start, and you just gave me that place! i don't know if i'll be able able to get to it before the weekend, but when i do i kind of have an idea now of where to go, thank you!

[Big T]

You can drain the carbs in 5 minutes