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Richard A. Alwes

Carter 644SA Question

Just can't stay away

I need an exploded view for this carb. While taking mine apart a ball rolled out and I am not exactly sure where it needs to be. From what I seen on my rebuild kit instruction the one I can hardly see I am just not sure. The screen is still in the bottom of the excelerator pump chamber.

Posted on: 2009/8/14 9:45

HH56

Re: Carter 644SA Question

Forum Ambassador

What's it used on? Looked thru my Motors manuals back to 36 and don't see that number listed.

Posted on: 2009/8/14 10:35

Owen_Dyneto

Re: Carter 644SA Question

Forum Ambassador

At least one of my reference sources, Nat Dawes book, lists the 644SA for 22nd series after motor numbers G200015 and H200016.

EDIT - just checked Motor's (12th Edit) and it also shows the 644SA for 22nd series Eight and Super Eight.

Posted on: 2009/8/14 11:04

HH56

Re: Carter 644SA Question

Forum Ambassador

Thanks, O_D. Found it. 11th series manual only to 47 and breakdown in 17th series by type so in different chart.

Hope this helps--Fig 71 & 72 only mention I see of check balls in carb section and then one in the starter switch.

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Posted on: 2009/8/14 11:41

Richard A. Alwes

Re: Carter 644SA Question

Just can't stay away

The figure I think is figure 71 wdo. What I do not see is the pump check needle or ball. I installed the pump check needle then the ball. Any one know if this is correct?

Posted on: 2009/8/14 12:51

Owen_Dyneto

Re: Carter 644SA Question

Forum Ambassador

Been years since I had one of these apart, and I didn't review the info that was posted, but common engineering sense says you need two checks, one at the pump inlet (probably a ball) to prevent discharge from going back out the inlet side, and another on the outlet side, probably a needle, to prevent venturi vacuum from bleeding off the pump jet outlets. Just my thoughts - could be incorrect.

Posted on: 2009/8/14 14:05

BDeB

Re: Carter 644SA Question

Home away from home

I have the Carter specification sheet for the 644S and 644SA carburetors. It shows only 2 balls - the small one used for the accelerator pump suction (under the screen at the bottom of the plunger chamber) and the larger one used for the starter switch. Only a needle valve is used for the accelerator pump discharge.

Posted on: 2009/8/14 21:34

Richard A. Alwes

Re: Carter 644SA Question

Just can't stay away

Thanks BEDeb

I will remove the ball from where I installed it. Is there any chance I could get a copy of your sheet on the the 644SA carb. If you can email it to ralwesnotary@gmail.com

Posted on: 2009/8/15 6:50

Richard A. Alwes

Re: Carter 644SA Question

Just can't stay away

I suppose the last rebuilder of the carb just got it wrong when he decided there needed to be an extra ball installed. I finished rebuilding the carb this morning and it is running much better. Thanks all for you assistance I could not have made it without you help. Bottom line it runs very well with just a single pair of balls.

Posted on: 2009/8/15 11:47