Joined: Oct 26, 2007 Posts: 2868 Location: Greensburg Pa
Posted: Wed Jun 07, 2017 8:08 pm Post subject:
i always have the choke closed when i start it. you use the word circuit.all i can think about is electronics.how do i repair the choke circuit?thanks
The THROTTLE should be closed when attempting to start it. The circuit that I'm referring to is the path that the fuel takes from the bowl to the throat of the carb. These carbs don't actually have a "choke". A choke is usually a butterfly valve that chokes off the air flow and causes an over rich fuel mixture. These carbs use a starter valve that is lifted off a seat and allows extra fuel to flow from the bowl to the throat. There's a very small orifice in the bowl where the fuel enters the starter valve "circuit". It's not uncommon for that orifice to be plugged and cause hard starting.
......Paul _________________ ï¿½77 CB550f
ï¿½75 GL1000-finally finished
68 CB450K1-taking up all my time
Joined: Oct 30, 2009 Posts: 1779 Location: Parker, CO
Posted: Thu Jun 08, 2017 8:03 am Post subject:
Opening the throttle while starting a cold 2-stroke, is one of the most common mistakes users make. Paul has explained the process correctly. In order for the engine to draw fuel through the starter circuit, it must be able to pull a vacuum through that circuit. If the throttle is open even slightly, all the vacuum potential is lost through the air intake. Even with the throttle closed, the throttle slide is still open just a bit, like it would be when you are idling without the enrichment circuit. _________________ ...the era is gone forever, fortunately the motorcycles remain...
i cleaned out the enrichment tube and sprayed carb cleaner in it,and cleaned the spark plug(didn't need it,but why not?)also,took off the bowl on the petcock.it looked like it had a disintegrated piece of foam rubber in it.is there supposed to be a filter in there?cleaned it out.also,when i push down the "choke"it popped back up some,so i made a clip to keep it completely closed.started,without throttle,in 5 kicks!thanks again for all your help.
All times are GMT - 6 Hours Goto page Previous1, 2
Page 2 of 2
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You can attach files in this forum You can download files in this forum