Stalling after downhill - Honda Rebel Forum
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post #1 of 23 Old 09-13-2019, 12:01 PM Thread Starter
 
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Stalling after downhill

After a 2-3 minute run of mostly downhill, partly using the throttle, I am finding the bike has a tendency to stall when I come to a stop.


Yesterday I chem-dip/sonic/air clean and boy it runs so much nicer, no dead spots, except when still cold, which is to be expected.


Now it stalls after 10-20 seconds of downhill.


Anybody have an idea what is going on?

1974 CB125S (purchased 1983, ate 2 crankshafts, sold 1984)
1986 Rebel 250 / N. California (purchased 2019)
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post #2 of 23 Old 09-13-2019, 03:30 PM
 
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Is it being choked at that time? It is super rich when choked. I had forgot to unchoke one time, ran fine until I stop, and dead it went. I quickly realized it was choked. Pushed it off and it fired right back up.

2016 Honda Rebel 250 - The "Piglet."
AFR sensor equipped and downsized to a 0.105" main jet.
The only changes so far.
Bought on 6/29/19 with 44 miles.
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post #3 of 23 Old 09-13-2019, 09:30 PM Thread Starter
 
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No, choke is definitely off and it fires right up. This is a somewhat recent development.

1974 CB125S (purchased 1983, ate 2 crankshafts, sold 1984)
1986 Rebel 250 / N. California (purchased 2019)
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post #4 of 23 Old 09-13-2019, 10:24 PM
 
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Sounds like the idle is too slow. Maybe? Idle is supposed to be around 1,800 RPM, idle doesn't sound like a putt putt putt, it's a low growl.

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Silver '86 450
Black '00 250
Red '07 250
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post #5 of 23 Old 09-13-2019, 10:40 PM
 
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I read idle was 1,400 rpm. But without a tach...

I think (and I'll double check when I can) that during the long off-throttle decent, your engine is likely running rich (normal). The throttle is closed cutting off air, largely. Maybe during that extended time the spark plugs are slightly fouling. When's the last time you put fresh spark plugs in it?

2016 Honda Rebel 250 - The "Piglet."
AFR sensor equipped and downsized to a 0.105" main jet.
The only changes so far.
Bought on 6/29/19 with 44 miles.
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post #6 of 23 Old 09-13-2019, 11:06 PM
 
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Quote:
Originally Posted by 7milesout View Post
I read idle was 1,400 rpm. But without a tach...
Correct! +/-100 RPM. Still, the parallel twin idles odd. It stammers here and there. If idle is too low it dies.

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Silver '86 450
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post #7 of 23 Old 09-14-2019, 03:13 PM Thread Starter
 
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Fist time I had it set to 1200, it ran for 3 months before the stalling occured. This time around I set it to 1300. I guess next time I adjust it, I'll just try for 1400, LOL. The manual I have says 1400 in one place and 1300 +/- 100 in another place.



Plugs were reset gapped about 1000mi ago, were a nice tan. I checked the colour only a few days ago, still a nice tan, but didn't gap them.

1974 CB125S (purchased 1983, ate 2 crankshafts, sold 1984)
1986 Rebel 250 / N. California (purchased 2019)
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post #8 of 23 Old 09-14-2019, 09:13 PM
 
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Maybe a long shot but was it a steep enough down hill that fuel ran away from the petcock?

2016 Honda Rebel 250 - The "Piglet."
AFR sensor equipped and downsized to a 0.105" main jet.
The only changes so far.
Bought on 6/29/19 with 44 miles.
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post #9 of 23 Old 09-15-2019, 06:14 PM Thread Starter
 
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Quote:
Originally Posted by 7milesout View Post
Maybe a long shot but was it a steep enough down hill that fuel ran away from the petcock?
You may be onto something there. The last section is (guessing) 45 degrees straight, tight right, tight left, short straight leveling out to about 5 degrees. So I'm definitely off the gas for the end of that.


Thanks, I'll check the odometer next time that happens.

1974 CB125S (purchased 1983, ate 2 crankshafts, sold 1984)
1986 Rebel 250 / N. California (purchased 2019)
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post #10 of 23 Old 09-15-2019, 06:38 PM
 
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Quote:
Originally Posted by leebrown66 View Post
You may be onto something there. The last section is (guessing) 45 degrees straight, tight right, tight left, short straight leveling out to about 5 degrees. So I'm definitely off the gas for the end of that.


Thanks, I'll check the odometer next time that happens.
Lee, not doubting that what you're riding is very steep, even steep enough to affect the fuel pick-up. But I can guarantee its not 45 degrees!

A 45 degree slope is a 100% grade - - if you stood at the edge youd feel like you were looking over a cliff.

Even a 5 degree slope would be quite steep - - about 10+% grade. I've ridden up a 23% grade and at the bottom it looked almost like a wall. Too steep to ride down, actually. But in reality this was a roughly 11 degree incline!!

Sorry to interject this side discussion. Im genuinely curious to know the cause of your issue. I have never ridden down a long steep slope but would like to know the solution in case I ever do!

.

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