Topic: stalling at the stop sign...or end of ride.

[setdog]

75 cb750

I think this is common problem.  I've had this bike about a month and while it keeps
Getting better issues remain.   

Today this is my problem.  Took bike out for a brief loop around the block, got to the stop sign
Dropped into first, as I came to a complete stop I pulled in the clutch and the bike stalled.

Waited a moment, set into neutral, restarted with a little throttle, vroom vroom, pop into first
And away I go. 

Get to my driveway, shift down to first, as I approach the bottom, still in first, pull in the clutch,
Stalls again. 

Repeated the route a second time and got exactly same results.

Thought I would ask for some opinions before putting on my blindfold and mittens, and start hammering away at stuff.

Idle jet, clogged passage?
Float height?
Vacuum leak?
Throttle stop? - don't think this is it.
Air fuel mix? - don't think this is it.
Carb sync? - doubtful.
Dirty plugs? I don't think so. But Im so not an expert.
She idles pretty nicely from a cold start around 1k. +/- 100 rpms. Runs pretty nicely too.
But obviously I don't want to be starting up at every intersection.

[bollingball]

So are you saying as long as you have the clutch pulled in it will idle fine and as soon as you let the leaver out it shuts down? Does it lurch forward any at all?

Ken

[setdog]

So are you saying as long as you have the clutch pulled in it will idle fine and as soon as you let the leaver out it shuts down? Does it lurch forward any at all?

Ken

When i approach a stop, slow down, pull the clutch in, it stalls.

[HondanutRider]

I think this fairly common.  One thing I've noticed is that the throttle linkage has a rest position at idle and then you can over-rotate (i.e. further "off") from this "rest position.  This will close the throttles even more and reduce the idle to an even lower position.  This causes the motor to often stall.  Try not to unwind the throttle too much, or perhaps there is a stop on the linkage that can be adjusted to prevent over-rotation below idle.

[setdog]

I think this fairly common.  One thing I've noticed is that the throttle linkage has a rest position at idle and then you can over-rotate (i.e. further "off") from this "rest position.  This will close the throttles even more and reduce the idle to an even lower position.  This causes the motor to often stall.  Try not to unwind the throttle too much, or perhaps there is a stop on the linkage that can be adjusted to prevent over-rotation below idle.

Is this what the manual refers to as overcross? This might very well be where the problem is coming from. Because this does seem like that I've observed.  And I haven't invested enough time
Figuring out this aspect of throttle adjustment.  Mainly because its a pain in the arse...tank on, tank off, tank on, tank off, tank on,... I just wanna ride!!

PS.  I'm a garage hack...I do things the only way I know how...and I really don't know how to do much.

[bjbuchanan]

It could be as simple as you having not set your main idle knob on a warm engine. Lotsa guys used to newer stuff or vacuum style chokes don't like the idea they have to tend to a cold bike, they would rather spend that time gearing up. Such is life, see if that is your problem. A cold engine, choked at 1200 rpm will be wayyy too low warm with the choke off

[setdog]

Interesting...I will look into that, it is quite possible since I hardly put miles on it, I may never really
Achieve a good warming when I'm doing these adjustments.

[seanbarney41]

+1, it really takes a surprisingly long time to get these bikes fully warmed up, also, 1000 rpm is pretty low idle speed...try 12-1500 rpm

[bjbuchanan]

+1, it really takes a surprisingly long time to get these bikes fully warmed up, also, 1000 rpm is pretty low idle speed...try 12-1500 rpm

True, warm enough to turn the choke off and it doesn't die isn't really warm for these suckers

[flybox1]

my K8 idles really well at 1400.  it takes a good 10 minutes to get it warmed to the point i can take it all the way off the fast idle cam.  after about 30 minutes of riding, i could drop the idle to 1200-1300.
1400-1500 is not too high of an idle.  set it to hold there, and leave it.

[greenjeans]

It could be as simple as you having not set your main idle knob on a warm engine. Lotsa guys used to newer stuff or vacuum style chokes don't like the idea they have to tend to a cold bike, they would rather spend that time gearing up. Such is life, see if that is your problem. A cold engine, choked at 1200 rpm will be wayyy too low warm with the choke off

What he said.

[750K]

my K8 idles really well at 1400.  it takes a good 10 minutes to get it warmed to the point i can take it all the way off the fast idle cam.  after about 30 minutes of riding, i could drop the idle to 1200-1300.
1400-1500 is not too high of an idle.  set it to hold there, and leave it.

My 77 is the same, it's happiest at idle around 1300.