I took Big Red out for a ride today, carburetors need adjustment.
Since installing my Boyer ignition, Ive been trying to get my carburetors dialed in. The last time I took it out , the carbs were set at factory spec and it fired right off and idled well when it was cold, but when the motor got hot the idle sped way up. So I reached down and backed off the two idle stop screws and it seemed to run fine, but I was freeway blasting that day, so not much low rpm running.
Today however, when I went to start it cold, it took more cranking than normal and idled roughly and missed and popped at idle. Today’s ride was all stop and go with low rpms and a lot of riding with the throttle just barely open.
Once it warmed up the idle seemed fine, but I’m getting lots of popping on decel and when I’m cruising at low speeds with the throttle just barely open, same thing, lots of popping and farting. As soon as I twist that grip it opens up and runs well again.
Here’s my hunch.
I think my pilot / idle circuit is running too lean. I think that was why my idle speed went up on me the first time I had it out. And then when I set the idle speed down , now the lean fueling is causing it to pop and miss at small throttle openings and on decel. When I got home, I set the idle screws back to factory settings and opened up my air screws a half turn. I’ll take it out again soon and see where that puts things.