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General Category >> Rubber Side Down! >> Where does the white spacer have the most effect?
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Message started by voldigicam on 10/30/09 at 04:37:39

Title: Where does the white spacer have the most effect?
Post by voldigicam on 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.

Title: Re: Where does the white spacer have the most effe
Post by Routy on 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.

Title: Re: Where does the white spacer have the most effe
Post by Boule’tard on 10/30/09 at 09:16:27

3E312B302C2A393B333D2A580 wrote:

..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.

Title: Re: Where does the white spacer have the most effe
Post by Ed L. on 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.

Title: Re: Where does the white spacer have the most effe
Post by LANCER on 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

Title: Re: Where does the white spacer have the most effe
Post by Ed L. on 10/30/09 at 15:51:25

good link!!!

Title: Re: Where does the white spacer have the most effe
Post by Mr 650 on 11/01/09 at 10:56:01

Handy post, Thanks.