engine quits when shifting

[fredcamp]

Just new to me is my 1986 GL1200 SEi. I have the service manual but not the SEi supplement for '86.
First issue: while riding if I pull in the clutch lever all the way, the engine stops. It is inconsistent. I downshift before all of my stops and most of the time it will idle nicely (maybe a bit too slowly) in first gear. For some reason I notice it mostly on upshifting and it may stall at every shift.
I suspect the clutch switch that prevents starting before disengaging the clutch.
Any confirmation?









If I die on the 'wing, at least I die HAPPY!

 

[Ansimp]

I am not sure about the efi 1200 but the clutch switch should not stop the engine unless it is hooked through the sidestand circuit like my 91 CBR which does shut the engine down when in gear and the sidestand down.

 

[fredcamp]

OMG the side stand too?
Let's stop making things idiot proof so we can start to cleanse the gene pool. lol

 

[slabghost]

Not sure it has one but a faulty side stand switch could do that for sure.

 

[Terry]

Ok, just another lemming chiming in here saying the same thing already said.

Check the sidestand switch. :BigGrin:

I'm not sure if the microswitch is normally open or normally closed. It could have an inscription on the switch NO or NC.

Simple test:

To check for normally closed microswitch malfunction connect the two wires connected to it together, go for a ride see if it solves the problem.

To check for a normally open microswitch malfunction unplug the two wires that connect to it insulated one with tape temporarily. Go for a ride see if this solves the problem.

If either test works, you need a new safety microswitch here.

 

[fredcamp]

That will be easy, Terry. The "re-cycle Garage" meets this PM and I will check it out with the guys. My service manual does NOT show a side stand switch. However, as I mentioned I do not yet have the '86 Supplement for the "SPECIAL edition i" model, which therefore may have that safety switch. (I am Pretty sure it does NOT)

 

[Terry]

fredcamp » 2 minutes ago[/url]":3am8quf3]
That will be easy, Terry. The "re-cycle Garage" meets this PM and I will check it out with the guys. My service manual does NOT show a side stand switch. However, as I mentioned I do not yet have the '86 Supplement for the "SPECIAL edition i" model, which therefore may have that safety switch. (I am Pretty sure it does NOT)

If it has the switch, there should be an indicator light somewhere on the dash.

Also, "if "working properly the bike should not start or even spin the motor while on the sidestand if it indeed is equipped with this safety switch.

 

[fredcamp]

No side stand switch! Next....

 

[joedrum]

hmm now i think were getting into some FI deal like senor or somthing

 

[slabghost]

See if there's an interlock switch on the clutch master.

 

[Terry]

You know, it wouldn't seem to be a micro on the clutch, because that (if equipped) and working properly should not allow you to start it in gear........................... BUT: try to go around this switch temporarily just as a test., like the other test I suggested.
Be careful not to start it in gear with this disabled.


If this isn't it, my only other guess (strictly a guess) is a defective kill switch somehow shorting out??

 

[dan filipi]

On the non-FI there is nothing in the clutch circuit designed to actuate anything but a neutral safety switch, unless someone has added something in. FI most likely the same.
I would do like Terry suggested then go from there.

 

[zman]

I can see a poorly running stalling between shifts, these wings will run fairly smooth with a weak or even non firing cylinder, they wont have power but they will idle, what made me think this is you say it is idling a little slow.
Check the plugs and or when cold fire it up for a few seconds and feel the exhaust pipe where it leaves the cylinder (all 4) and see if you have a cold one or one that is cooler than the others, a plug check can also confirm trouble.
May be an injection issue, maybe a bad spark plug or wire, seems the injectors should need some kind of service after so many years, an additive at least to clean them out , maybe some kind of purge.
think you may have a weak 1 or 2 cylinders or non firing cylinder.

 

[Ansimp]

zman » Mon Sep 07, 2015 3:01 am[/url]":3bsmzuh9]
I can see a poorly running stalling between shifts, these wings will run fairly smooth with a weak or even non firing cylinder, they wont have power but they will idle, what made me think this is you say it is idling a little slow.
Check the plugs and or when cold fire it up for a few seconds and feel the exhaust pipe where it leaves the cylinder (all 4) and see if you have a cold one or one that is cooler than the others, a plug check can also confirm trouble.
May be an injection issue, maybe a bad spark plug or wire, seems the injectors should need some kind of service after so many years, an additive at least to clean them out , maybe some kind of purge.
think you may have a weak 1 or 2 cylinders or non firing cylinder.

I agree with Jeff with low idle etc. Also an efi requires more power to run so a good battery is essential with a healthy charge circuit, as we know almost no charging at low engine speed.

 

[fredcamp]

I have already checked the charging which shows 13.9 or 14 on the voltmeter and is confirmed with my multimeter on the almost NEW battery. That issue is put to rest along with the side stand which does not and has not had a safety switch.
Further investigation: When I start in neutral I must pull in the clutch lever. Nothing happens to the idle about 980 rpm when repeatedly pulling in and releasing the clutch lever.
When I select first gear and begin to release the lever there is an almost instantaneous hesitation as I pass about 1/4 released. At 1/2 the clutch starts to engage and pull the bike. Coming back in to disengage the clutch--nothing happens but a slight hesitation EVERY time when releasing the lever. Doing it very slowly a coujple of times the engine stalled at that hesitation point.
The problem then seems to be completly mechanical and related to the position of the clutch lever.
Good thing I'm nearly bald so pulling my hair out is not a problem! lol

 

[dan filipi]

More details what you mean by "hesitation"?

 

[fredcamp]

Hesitation: As if the engine stops firing for a fraction of a second, not even long enough to show a reduction in rpm's. Except for the couple of times when it quit.

 

[dan filipi]

When it does this, does it feel like the clutch is grabbing when it shouldn't be?
Does it do this in neutral?

 

[fredcamp]

No the clutch does not grab until 1/2 like I said and it does NOT hesitate in neutral or stall with clutch lever movement.

 

[slabghost]

Still seems like an electrical issue but it may be a fuel pressure or injector issue. Maybe one of the sensors slightly off?