1972 cb350 idle issues
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From: Ken Abrams on 14 Jun 2007 21:02 "mwhyte" <u35079(a)uwe> wrote > Is it as simple as adjusting the idle here, or am I missing a more complex > problem? Any help would be appreciated. Thanks much, MW > As you suggest, it might be as simple as adjusting the idle SPEED, since that's one of the things the choke mechanism does (raises the idle speed). Do you have a tach? If so, what IS the idle speed? Probably should NOT be below 1K.
From: Timo Geusch on 15 Jun 2007 01:48 "mwhyte" <u35079(a)uwe> writes: > I had a problem with stalling and the left piston not firing until the engine > heated up significantly. So I did the obvious: Rebuilt the carbs -- even > replaced both diaphragms -- replaced the air filters, replaced the points, > set the timing (all by my mechanic, of course). Depending on your mechanic this may or may not be a good thing. > Both pistons are firing now, but unless the choke is open (minimum halfway) > the bike will stall when idling (ie. sitting at a light). Also stalls > sometimes on downshift. > > Is it as simple as adjusting the idle here, or am I missing a more complex > problem? Any help would be appreciated. Thanks much, MW What's the idle speed set at? Also, the following potential problem areas come to mind: - Air leaks - Sticking float needle valve, although that would show itself pretty much all the time.
From: mwhyte via MotorcycleKB.com on 15 Jun 2007 09:43 > >What's the idle speed set at? Also, the following potential problem >areas come to mind: > >- Air leaks >- Sticking float needle valve, although that would show itself pretty > much all the time. When you say air leaks, where would be the most typical sites? In the carb, or the engine (ie. head gaskets) themselves? I'm considering getting a gasket set and just replacing all of them; I'm sure they haven't been touched in 35 years ... -- Message posted via MotorcycleKB.com http://www.motorcyclekb.com/Uwe/Forums.aspx/tech/200706/1
From: mwhyte via MotorcycleKB.com on 15 Jun 2007 09:45 Timo Geusch wrote: >- Sticking float needle valve, although that would show itself pretty > much all the time. Also, Timo, if the float needle valve is sticking, what is the behaviour? The bike seems to idle fine as long as the choke is open; but it shouldn't need the choke open after a certain point to run properly, I wouldn't think ... -- Message posted via MotorcycleKB.com http://www.motorcyclekb.com/Uwe/Forums.aspx/tech/200706/1
From: Ken Abrams on 15 Jun 2007 13:14
"mwhyte via MotorcycleKB.com" <u35079(a)uwe> wrote > bike seems to idle fine as long as the choke is open; but it shouldn't need > the choke open after a certain point to run properly, I wouldn't think ... > First, I think what you are trying to say is that you need the choke (partially) CLOSED. Normal running position is choke off.....open. For starting, choke is on......closed. Second, the most common air leak is at the rubber boots between the carbs and the intake manifold, that is, the side of the carb toward the engine. Third, two of us have asked you nicely now what the idle speed is and you have not responded. SO WHAT IS THE IDLE SPEED......or don't you have a tach? And lastly, given your (apparent) mechanical ability, you probably should NOT be replacing the head (or other) gaskets on the engine unless you KNOW they are a problem. Likely they are not. |