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stalls when hot

  • Thread starter Thread starter jasper
  • Start date Start date
jasper said:
Yes well...I wish I could tell if it is kicking in at higher revs. My feeling is no, but it's hard to tell.

And it ain't the plug unfortunately.

I swapped the #1 plug for the #2 plug to test whether the plug was the problem already. No change. I checked the gaps on the plugs when I installed them and they were fine at 0.030"

I agree though flyboy - black and wet sure doesn't sound like a lack of fuel to me either, but I have lots of spark and even when I switched the coils and wires #1 wasn't firing.

Way way to rich could cause this too of course. I'm not very certain about my fuel level measurement. I haven't devised a good way to attach a hose to the drain. Maybe my fuel levels are actually way high or maybe a needle valve isn't closing.:?:

It's worth noting that when I first got the bike it sounded like it was missing and it stalled when it got hot. I rebuilt the carbs and installed thinner shims and replaced the ignition system...and it's still missing and stalls when it gets hot.
Click to expand...
Jasper...PM me. I have a real fuel height gauge that might work better for you, one that screws into the drain hole.
 
Ok, like I said in my first post, it seems like you have a rich cut thing going on there, so, yes, too much fuel can cause it as well.
What I suggest you do, pull the carbs and whip off the float bowls and set up the floats in the normal wayby measuring from the top or step of the float to the gasket surface, 24 - 26 mm or something like that, I don't know thw actual numbers for your bike, check in the manual to be sure.
This will get you right in the ball park, until you can rig up a clear tube setup to use.
While the carbs are off, may as well go through them with a fine tooth comb again, it just takes a little bit of dirt in one little channel to cause your headaches.
You won't be the first person to have cleaned the carbs, only to find something in there a second time round.
Let us know what you find.
 
Well, if there's no combustion the pipe should stay pretty darned cool at idle. Off idle you should feel the exhaust pipe warm up. I'm thinking that #1 is too closed; it's drawing fuel in but no air (or not enough). It doesn't take much to be off; the throttles are barely cracked at idle. You need to vacuum sync your carbs...
 
BigD_83 said:
Jasper...PM me. I have a real fuel height gauge that might work better for you, one that screws into the drain hole.
Click to expand...


Hi Derrick. I sent a couple of PM but they don't appear to be getting logged. (Weird)

I am stoked on borrowing the fuel gauge and on doing a carb synch. You can call me at 604 809 0930 or email me at rexjoropo@gmail.com and we can talk about timing and logistics.

Super thanks for the offer to help. I'm oh so close to getting my issues sorted.

thx
 
cowboyup3371 said:
Do you have your PM settings to save sent items? Go in to the User CP and change that setting.
Click to expand...

Done...I turned on my email notification too. I believe these were defaulted in the other forums I hang out on.

Cheerss
 
Update...

BigD Derrick (not actually very big if I'm honest) was very kind enough to lend me a fuel level gauge and the results were surprising to say the least.

#1 and #2 couldn't have been more spot on, and #3 and #4 were a smidge high...but not enough to worry about.

So good news, bad news.

So I took the Mike's excellent advice and verified that #1 was firing on the throttle...by feeling the exhaust pipe. Cold at idle - warm then hot on the throttle.

and then I took Mikes's excellent advice again and cracked open the #1 butterfly until I heard the exhaust note change and felt the exhaust pipe start to get hot at idle.

That's a BINGO as Hans Landa would say.

So then I leaned out some mix screws, I note #1 can still be turned in all the way without stumbling...so it's probably a bit worn.

Long story short...I ghetto synched it and it's running better than ever.

Derrick is being kind enough to lend me his brand new never been used synch tool too, so maybe this weekend I can dial it in just right.

This is great guys - great forum.:dancing:
 
Aww, shucks...

The symptoms were altogether too familiar, if you know what I mean :rolleyes: (mine was #4)

"Ghetto sync" - that's a new one
 
UPDATE:

Rode the bike to work today. It runs great....for about 35 minutes of my 37 minute commute.

Same...old...thing.

It stalls when it gets hot in even a little bit of traffic.

On the way home it was really bad (more traffic) and the roughness would persist through the middle range as well.

Funny thing is, after 20 minutes of moderate to hard riding, it idles great at stop lights or whatever. Same thing after 25 minutes, and after 30 minutes. Any longer than that though and it gets boggy and won't idle and usually won't start until I let it cool down.

Then it runs great again.

I'm still attributing it to richness, and a carb synch and mix screw adjustment planned for later this week should go a long way to making this better, but I have a nagging feeling this issue may never actually *go away* for real.

Will post back - loving the bike when it runs though.
 
It sounds like the heat could be causing expansion somewhere, and that cooling down let's it relax to normal. The fact that it starts up and idles again after cooling reinforces that idea. That is suitably vague, but maybe someone else can pick up that line of thought.

That being said, I haven't the foggiest idea of where that would most likely be happening, but possibly the head/valves. You've already changed the coils. Have you managed to check the voltages once things get hot and the bike starts to stumble/before it dies? Could this be an overheating RR situation?
 
BigD_83 said:
It sounds like the heat could be causing expansion somewhere, and that cooling down let's it relax to normal. The fact that it starts up and idles again after cooling reinforces that idea. That is suitably vague, but maybe someone else can pick up that line of thought.

That being said, I haven't the foggiest idea of where that would most likely be happening, but possibly the head/valves. You've already changed the coils. Have you managed to check the voltages once things get hot and the bike starts to stumble/before it dies? Could this be an overheating RR situation?
Click to expand...

Hi Derrick -

I'm currently thinking a vacuum leak is opening up when the bike gets hot but your Reg/Rec theory is plausible also. I haven't yet measured the stator output despite a number of suggestions to do so.That's just one more thing I want to try this weekend, lot's of good words written. I have noticed that the R/R actually stays cool to the touch which is counter to my expectations. There's a test procedure in the manual for the R/R too....gotta do that.

I was hoping also to come by and borrow your carb synch tool, perhaps even today? It would be nice to troubleshoot with the knowledge that the carbs are in synch.

My wife and kids are heading out of town sunday/monday and I intend to spend every moment oof that time getting a bike that I can rid etogether.

I have to admit I've also made arrangements to go look at a BMW R100GS for sale. The riding season is running out on me. It's a high mile bike though, and the last thing I need is another trouble bike.

Any chance I can come by to pick up that carb synch tool?

Thanks
 
any progress?

any progress?

Jasper,

Have you made any ,more progress with the GS now that you're riding your BMW? Oops, did I just out you on the forum?
 
Hey Derrick.

Success for real this time.

Turns out one of the leads from my 1,4 coil was flaky. It ran ok cold, the impedances were spot on, but when it got hot the #1 lead just failed.

I deduced this by riding until the bike stalled, then pulling each lead in turn and inserting the wire from my circuit tester into the end cap. The banana clip fits perfect right.

Then by holding the end of the wire neat the head, I could observe nice big beautiful sparks when I ran the motor...all except for #1 which was weak.

IN the meantime I replaced the reg/rec - because I was clearly overcharging.

Rode the bike to work today and it's beautiful. Nicer than the Beemer in some respects.

As far as outing goes......no shame in a 1990 BMW K75S and we are allowed more than one bike anyway right?

Thanks again everybody for your help.
 
Nice endings are always the best. Fantastic to hear she's up and running, now go and ride the @#$!!* out of her.
 
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