Have two VM34s on a 81’ XS650:
I’ve read through tons of tech and I also have the manual. I’m still scratching my head.
The bike idles super rich. Plumes of black smoke, fouling plugs, unburnt fuel and misfires.
The idle adjust screws have to be maxed out (screwed all the way in) for the bike to run. Still low rpm. The air mixture adjusting screws have almost no effect on it. Sometimes it will stall out if it’s screwed all the way in.
My first thought was that is has too big of a pilot jet. they both had 17.5
I went down to a 15.0
It started firing on both cylinders more consistently. Air mixture screw still had very little effect. Idle screws still maxed out.
Air jets are 2.0
Main jets are 175
I created a vacuum leak, and the bike immediately started running ‘better’.
There’s no way the pilots are too big. Even when they were 17.5
I haven’t gotten to ride the bike yet, I bought it as a project.
Any thoughts?
I’ve read through tons of tech and I also have the manual. I’m still scratching my head.
The bike idles super rich. Plumes of black smoke, fouling plugs, unburnt fuel and misfires.
The idle adjust screws have to be maxed out (screwed all the way in) for the bike to run. Still low rpm. The air mixture adjusting screws have almost no effect on it. Sometimes it will stall out if it’s screwed all the way in.
My first thought was that is has too big of a pilot jet. they both had 17.5
I went down to a 15.0
It started firing on both cylinders more consistently. Air mixture screw still had very little effect. Idle screws still maxed out.
Air jets are 2.0
Main jets are 175
I created a vacuum leak, and the bike immediately started running ‘better’.
There’s no way the pilots are too big. Even when they were 17.5
I haven’t gotten to ride the bike yet, I bought it as a project.
Any thoughts?