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Cold #3 exhaust pipe...

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Guest

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I've noticed the #3 exhaust pipe on my "81 (16V) 750L stays stone cold for a little while at start up. Haven't noticed a missing cylinder while riding really, but still, why so cold?? It eventually gets hot, but the color of the pipe isn't the nice golden hue as the other three, so I guess it never gets up to the same temp as the others. No complaints about the running of the engine however.

Clean carbs, recent valve adjustment, no air leaks, there's spark to the plug & the plug has good color...

Only thing I can think of is, the bike had sat for quite a while before I got her and maybe the valves have seated at bit more no that she's being run. I'm planning on checking them all again to verify (gotta love them 16V engines for that) but was wondering if you guys had any words of wisdom??

Thanks,

Mike
 
Are you using the 'choke' while you notice that #3 is not getting warm? :-k

Could be that the pick-up tube in the float bowl is clogged, not allowing that carb to richen up like the others.

When the engine is warm it's not needed, so operation would be smooth.

.
 
Steve said:
Are you using the 'choke' while you notice that #3 is not getting warm? :-k

Could be that the pick-up tube in the float bowl is clogged, not allowing that carb to richen up like the others.

When the engine is warm it's not needed, so operation would be smooth.

.
Click to expand...

Yes, choke on... clogged tube, that's a good guess (you're talking about that little brass one that sticks out from the carb body into the float bowl, right?)

Hopefully I can remove the float bowl & get at that tube with a small pc of wire without removing the carbs. What a giant PITA to remove those off this bike...

Tomorrow I'll have a go at it...

thanks
 
Steve said:
Are you using the 'choke' while you notice that #3 is not getting warm? :-k

Could be that the pick-up tube in the float bowl is clogged, not allowing that carb to richen up like the others.

When the engine is warm it's not needed, so operation would be smooth.

.
Click to expand...

Pretty good guess here I think. Those choke feed tubes are pretty small. Hope this pans out for you Mike.:cool:
 
Nessism said:
Pretty good guess here I think. Those choke feed tubes are pretty small. Hope this pans out for you Mike.:cool:
Click to expand...

I agree, makes sense considering the bike runs fine after warming up...

Pretty smart guy that Steve :)
 
hikermikem said:
Yes, choke on... clogged tube, that's a good guess (you're talking about that little brass one that sticks out from the carb body into the float bowl, right?)
Click to expand...
Yep, that's the one. :o

After poking with a wire, activate the 'choke', use the little nozzle, spray some carb cleaner through the tube. Activating the 'choke' will move the plunger and give that spray somewhere to go, maybe flushing the crud out in the process. Once the crud is out of the little tube, it should continue through the carb into the cylinder with no further obstruction.

.
 
Also make sure the passage in the bowl itself is clear, the one that supplies fuel to this brass choke tube, it commonly gums up on bikes that have sat.
 
tkent02 said:
Also make sure the passage in the bowl itself is clear, the one that supplies fuel to this brass choke tube, it commonly gums up on bikes that have sat.
Click to expand...
Yeah, and when you spray into it, be sure to be wearing your safety glasses.
icon_eek.gif


Carb spray in the eyes HURTS. :eek:

.
 
my first GS carb cleaning experience included carb spray in the eye. For a second I thought to myself "Yikes that sucks." Then it went on to include my thought that my eyeball was actually MELTING out of my head. Its exquisitely painfull. Fortunately, ive never yet had brake fluid or battery acid in the eye thus far, lets hope it never happens. I know i SHOULD wear saftey glasses, but sometimes....well im just gonna do this real quick, and the glasses are WAYYYYYYYYYYY over there....heh..
 
tkent02 said:
Also make sure the passage in the bowl itself is clear, the one that supplies fuel to this brass choke tube, it commonly gums up on bikes that have sat.
Click to expand...

yeah, I've cleaned a few sets of these CV carbs now & I make it a point to be certain both that tube & mating bowl passage are free & clear afterwards. However, maybe a really stubborn spec-o-crud got lodged there after my best efforts...

I'll mess with it today & see if I can affect any change without removing the carbs from the bike.
 
Steve said:
Yeah, and when you spray into it, be sure to be wearing your safety glasses.
icon_eek.gif


Carb spray in the eyes HURTS. :eek:

.
Click to expand...

Yup, had the "pleasure" of that experience a few times over the years, and you're right, that bowl passage somehow ALWAYS shoots right back at your head.

(I usually remember that immediately after spraying the first one :o)
 
Well, I abandoned the "fix on the bike" plan. Too difficult to remove the float bowl & even if I did, I wouldn't have enough room to do what i need to do anyway.

I'm working on a 1100EX at the same time and since the 750 is running well, I'm not too hurried to address the cold pipe.

I think I'll try a tank with a crap-load of seafoam in it & hope that cures it :rolleyes:.

On to the "new" project (or money pit, depending on how you look at it...)
 
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