Join Date: Sep 2012
Location: Silver City, NM
A week or so ago I posted the question and had a few answers. I tried and failed.
The bike - 85 VT500C - runs well on highway and plugs read nice and tan. Around town plugs get black and sooty, so tried adjusting the....uh....pilot screws ?? The little ones deep in the hole low on the carb ??
The rear cylinder responds fine to adjustment and was at 2½ turns, so moved it in to 1½ turns. Idle sounded better. Went to front cylinder and screwing it in all the way didn't make any difference until it was "almost" seated, then idle speed would increase.
I had asked about the WD-40 test for vacuum leaks and someone suggested carb cleaner as a better choice, so I went and bought a can and carefully sprayed each hose, tube, connector, gasket on both sides and no change in idle. Finally just soaked the whole thing with the cleaner and it made no change at all, so I doubt if I have a vacuum leak......but front cylinder is still the same.
The bike runs fine but idle is iffy. Sometimes at a light it'll idle just fine, others it'll stall on me. Sometimes idle is higher.
In rolling foothill country at 6,000 ft elevation on the highway I can hold 65 mph in 6th just fine, even on moderate hills.
Meantime, it's giving me 50 mpg overall and power is great, which pleases me and as I say it runs fine.......it just isn't "right." Any ideas ??