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Where does the white spacer have the most effect? (Read 176 times)

voldigicam

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Where does the white spacer have the most effect?
10/30/09 at 04:37:39

I understand that the white spacer leans the fuel metered by the needle throughout it's range. Does the white spacer have an effect over the whole throttle range, or only on the main?

I'm thinking of the range between idle and 1/4, the pilot range. Would the white spacer have a major effect on fuel bleed from the main in that area? Surely some fuel is coming by.

2007 S40
2003 Volusia 40th Ann.
Friendsville, TN

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Routy

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Re: Where does the white spacer have the most effe
Reply #1 - 10/30/09 at 07:41:49

Mine idled perfectly so I didn't touch the air screw
And mine showed no sign of lean running at WOT, so I didn't even think of touching the main jet, even tho I did relieve the exhaust a little.

W/o running 1 click choke all the time, it ran really ragged from just above idle to 1/4-1/3 throttle, so I attacked the spacer to 50%. That was the best guess I ever made,... it runs perfectly now, and if there is any, I don't notice any difference on WOT.

Being new to this carb, I really don't know what the pilot is or does, but what ever it does, its doing it well.

To me, trimming the white spacer does did the same thing as raising the needle clip one notch like we used to do on the bikes w/ the plunger w/ the needle clips.

Rich
'07 S40 Blvd stocker, except drilled OEM exhaust and white spacer mod...1/2 (.055)

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Boule’tard

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Re: Where does the white spacer have the most effe
Reply #2 - 10/30/09 at 09:16:27

Routy wrote on 10/30/09 at 07:41:49:

..so I attacked the spacer to 50%. That was the best guess I ever made,... it runs perfectly now, and if there is any, I don't notice any difference on WOT.

That sounds like a good move. When I was running that carb I took the spacer out completely and left the jetting stock. If I was going to tune that carb further I probably would have put back a thickness of 1/3 to 1/2 spacer and gone with a richer main jet to compensate. WOT was still plenty scary, though!

I try to think of needle height as "midrange mixture" but it's not as cut-and-dry as that. That guy diamond jim even said that his main jet was having an effect on his idle circuit. Dammit, where'd he go? :'( So anyway the point is, these adjustments do bleed over into the other ranges somewhat.

That which can be destroyed by the truth should be. - P.C. Hodgell

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Ed L.

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Re: Where does the white spacer have the most effe
Reply #3 - 10/30/09 at 15:41:03

Yeah there is an overlap with the adjustments. The white spacer goes from just over idle to about 1/3 throttle which is where the main jet starts to come into play. from 1/3 throttle up to about 2/3 the white spacer fades out and the carb starts to runs on the main jet till you get to full throttle where it is all the main jet at maybe 3/4 throttle. The pilot jet only controls the air/fuel mixture at idle and low rpms. After rejetting my carb I needed to kick up the idle rpm. I'm not sure what caused the idle to drop, I did everything at once, white spacer and main jet along with a different muffler.

Silver '02, clubman handle bars, Cobra headlight, Sportster muffler, K+N stock air filter, 152.5 main, Superbrace, oil cooler, 1/2 inch aluminium plate forward controls, spark advance, goes like stink

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LANCER Serious Thumper Alliance Member Offline Savage Beast Performance Parts Posts: 10661 Oklahoma Gender:	Re: Where does the white spacer have the most effe Reply #4 - 10/30/09 at 15:41:37 From the Tech section; a basic intro into how a carb works and the overlap of the low, mid and high throttle ranges. http://www.motorcyclecarbs.com/carbs101.pdf
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Ed L. Serious Thumper Alliance Member Offline "We All go a Little Crazy Sometimes" Norman Bates Posts: 2808 Sunny Florida Gender:	Re: Where does the white spacer have the most effe Reply #5 - 10/30/09 at 15:51:25 good link!!!
Back to top	Silver '02, clubman handle bars, Cobra headlight, Sportster muffler, K+N stock air filter, 152.5 main, Superbrace, oil cooler, 1/2 inch aluminium plate forward controls, spark advance, goes like stink IP Logged

Mr 650 Serious Thumper Offline The LS650- Classic style & 4-valve engine Posts: 1389 Mempho Gender:	Re: Where does the white spacer have the most effe Reply #6 - 11/01/09 at 10:56:01 Handy post, Thanks.
Back to top	SilverBlue '01,K&N,Snorklectomy,125mm NOS carb, 1/2 spacer & 155, 'Trapp, NC flyscreen, Suzy GelSeat, Osram H4 later..putt. Putt, PUtt, PUTT! 8) HelmetLawsSuck IP Logged

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