Open throttle stalls

[happy wanderer]

So, you do have the right amount of fuel in each float bowl? Should be something a little over 1" in height in the bowl.

As for the intake spigots, there was a write up by Oak in the latest Airmail. His method for removing them is to take the heads off and use an oven to heat the head to 350 degF. Then you stuff a cold, wet sponge into the spigot and use a pipe wrench to remove the spigot. Installation involves using blue Loctite and Hylomar with the spigot being cooled in the freezer. Then reheat the head in the oven and when at temp, quickly put the spigot in place.

Snowbum has a slightly different approach...looks like his way leaves the head on the bike...near bottom of this page:

http://bmwmotorcycletech.info/break-in.htm

I thought the spec for fuel depth in the middle of the bowl was 20mm to 24mm.
1 inch is 25.4mm so that might be too high?

 

[20774]

I thought the spec for fuel depth in the middle of the bowl was 20mm to 24mm.
1 inch is 25.4mm so that might be too high?

From memory, I think the 32mm carbs are slightly than an inch. Does the '83 G/S have 40mm carbs? Snowbum shows 28mm for 40mm carbs.

Just checked some specs and it looks like the '83 came with 32mm carbs, so the height should be 24mm. I think I was remembering the other carb thread which had the bigger carbs.

 

[s_alt]

The leaking petcock is really only a problem if your floats don't shut off the flow of fuel into the bowl. Once the fuel level gets high enough, the seat should close it off. But a leaking petcock and a malfunctioning float could spell disaster if the bowl overflows into the intake track, past an open intake valve and into the combustion chamber. Then it either slips past the rings to dilute the gas or in a really bad situation, creates a hydrolock condition the next time you hit the start button...bent rod.

Woof, That would NOT be good.
The bowl never seems too full when I pop it open so i'm assuming its stopping but definitely something for me to double check with the petcock and the float.

 

[cwroady]

Hey guys,
thanks for the responses.
Correct. I do indeed have the right amount of fuel in the float bowls after pulling and measuring them. I actually noticed yesterday ( with the carb still attached) when pulling the float bowl it wouldn't really stop dripping even with the petcocks turned off. not pouring out but dripping. the right wasnt doing that at all. Maybe my left petcock has a leak? idk

Did you give the dripping a chance to stop? Perhaps just the bypass fuel line connecting the petcocks was draining on the left side?

 

[nickrides]

If you can't fix it with a hammer,
Its probably electrical.

 

[s_alt]

If you can't fix it with a hammer,
Its probably electrical.

You mean like the coils or the ignition? I just replaced the coils and wiring. /:
Im curious how electrical would be making one side run leaner than the other.

 

[s_alt]

Did you give the dripping a chance to stop? Perhaps just the bypass fuel line connecting the petcocks was draining on the left side?

That's very possible. It does eventually stop. Plus wouldnt the carb be running really rich if it was overflowing or even start leaking from the bowl? passages are clean but the problem with this carb is that it's running leaner and no matter what i do with the jets or mixture screw it doesn't seem to change much.

 

[jimwjarmour]

hello again,

well have you checked the vaccum take off tubes under the carb beside the mixture screw if the screw is missing this would make it run weaker, worth a look,Jimmy

 

[brio]

Check your resistance across the two plug caps... could be a weak spark.

 

[jimwjarmour]

up date

hello, was wondering if you had up date on your problem?, Jimmy