Too rich

Kawboy
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Re: Too rich

1 month 2 weeks ago - 1 month 2 weeks ago

#34429

poptheclutch wrote:

By " throttle plunger" are you referring to the slide aka piston valve in parts diagram, or is that something else ?

Sorry, Yes I'm talking about the throttle slides. If they are hung up slightly, then the metering rods (needles) are higher allowing a richer amount of fuel to flow from the mains when the air flow is high enough to pull fuel from the mains. As I mentioned before, you shouldn't see any fuel flow from the mains until about 1500-2000 rpm on acceleration.

With the engine stopped, you should be able to raise the plunger with your finder and release it and hear it drop hard with a click sound at the bottom of its stroke. If they don't drop with a click, then you should figure out what's hanging them up. Either hardened diaphragms or dirty throttle slides or........

Last edit: 1 month 2 weeks ago by Kawboy.

The following user(s) said Thank You: biltonjim, stocktoy

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poptheclutch
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Re: Too rich

1 month 2 weeks ago - 1 month 2 weeks ago

#34431

Slides are working like they should. Whatever is going on it's on all 3 carb bodies, as there is fuel pooled in all the intakes, all the plugs are sooty. I'm thinking it's something with starter circuit.

The starter plungers appear to be sealing. One thing I thought odd was, I flushed thru the starter pick up tube to check seal of the plunger. When I did the alcohol I was using came out from around where the tube goes into the carb body (looks like a little wet there) as well as the hole where it is supposed to come out of when the starter plunger is raised.

Last edit: 1 month 2 weeks ago by Kawboy.

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Kawboy
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Re: Too rich

1 month 2 weeks ago

#34435

I'll assume you were flushing the Choke pick up tube using a syringe? If so, you may have put enough pressure in the tube to raise the Choke Plunger and also enough pressure in the tube to indicate a slight leak at the swage between the tube and the housing. Depending on how much pressure you were using, I might suspect the plunger seals as a problem. We've had reports in the past of leaking plungers.

Maybe Scotch could throw in his 2 cents here?

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poptheclutch
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Re: Too rich

1 month 2 weeks ago

#34438

Yes i was flushing using a syringe. The choke plungers were closed with only slight pressure on the syringe all the fluid came out at the base of the pick up tube. The plunger rubbers don't look that good. I'll put in the new plungers I have. I'm also thinking of sealing the area between the carb body and pick up tubes ( the well that the tube goes in). All 3 are leaking. I'm wondering if the p o tried to remove them ? Thanks

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dcarver220b
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Re: Too rich

1 month 2 weeks ago

#34440

Are you seeing wetness here?

Does that pickup tube deliver fuel to this port?

If so, could one 'plug' this orfice and see how the bike runs?

Wondering about things that may raise all 6 needles to high causing richness at idle....
. Diaphragms installed upside down (grasping at straws)
. Too thick of washer installed here?

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poptheclutch
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Re: Too rich

1 month 2 weeks ago

#34441

dcarver220b wrote:

Are you seeing wetness here?

More than wetness, with choke plunger sealed, liquid literally gushes from the pick up tube - carb body joint ( I guess, I can only see that it's coming from the well around the tube) with little pressure on the syringe.

Does that pickup tube deliver fuel to this port?

No, that port delivers air to the starter system / choke plunger.

If so, could one 'plug' this orfice and see how the bike runs ?

Probably real hard to start.

Wondering about things that may raise all 6 needles to high causing richness at idle....
. Diaphragms installed upside down (grasping at straws)
. Too thick of washer installed here?

Diaphragms are right, washer is original.

I've got 2 things going to see what happens : Replaced the original choke plungers that definitely were indented from the choke pick up orifice. and I sealed off the area at the pick up tube with JB weld. We'll see what happens ???

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