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Raising Needles...

  • Thread starter Thread starter Detman101
  • Start date Start date
D

Detman101

Guest
Question: If I raised my needles could it cause my idle circuit to be too rich?

I know the two are only related/overlapped towards the end of the idle circuit throttle-range but I just want to eliminate any and all variables before i tear into the carbs.
 
Yes, the needle has an effect on pretty much everything. The effect may be small, and if your mixture is right in other areas, your problem maybe the wrong size idle jet for the needle/main combo.
 
lhanscom said:
Yes, the needle has an effect on pretty much everything. The effect may be small, and if your mixture is right in other areas, your problem maybe the wrong size idle jet for the needle/main combo.
Click to expand...

Oh bloody hell. I didn't even think about the idle jet!!!
I forgot that those change size too. Damnit.
Crap, I'm going to have to go retrieve my chopped off stock exhaust cans and stick them back on the bike until I can buy a 4-into-one.

No wait, even if I buy a 4-into-one I'm still going to have to buy an assortment of jets to get the settings right for the megaphone pipe.
Damnit. I really did it now.
Why couldn't I just leave well enough alone...shit.

Dm of mD
 
Okay Luke, how about this!!!

I put the needles back at clip#3 and just increase my idle mixture!!
Would that get rid of the flat spot at 4.5k - 5.5k rpm with these mufflers?

Do you think that would work?

:?
Dm of mD
 
I don't know, but you must be pretty quick at rejetting by now, so give it a shot, and see what happens.
 
Luke,

I lowered my needles 1/2 a clip using the adjusting washers and It's still too rich. I also set the mixture screws to 1 turn out and the idle is too lean.

So....

The answer seems to be: "Lower needles back to position 3 and test from there."

I just don't see how adding mufflers that have more "flow-thru" could cause everything to be out of whack like this :?:

Dm of mD
 
Well, lowering the needles to the 2nd position from the top did it!
No more richness in the mid-range. Now the problem is the idle screws.
Cannot seem to set them at anything that isn't rich or lean. Weird.

The bike runs great from mid-range and up but I can't get the settings for the idle and low end right.
It runs rich at idle and no matter how I finesse the mixture screws it just ain't working.
I noticed that even though the baffles are removed on these pipes they have WAY more restriction. I lost a BUNCH of horsepower using these mufflers and I can see the backpressure...literally!
My carb boots that go between the engine and carbs kinda puff out when the engine is running. That never happened with the swiss cheese stock exhaust. So this week i'm searching for better-larger cans with true FLOW to put on there until I can afford a 4-into-one system.

The muffler replacement method was not meant for use with a stage-3 kit I guess...

Thanks man,
Dm of mD
 
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