Carburetor Problem?

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Mar 19, 2014 | 02:36 PM

#21

Rich's'78

Racer

Joined: Nov 2004

Posts: 485

Likes: 1

From: Oakville ON

Quote:

Originally Posted by bwinterstine

No. Initial is at 16 with advance hose disconnected and plugged. Vacuum advance adds another 16 for a total of 32 at idle. Mark to shoot for is 36 degrees so I could still add 4 more degrees.
I measured the cruise timing today which is the total of initial timing, vacuum advance and the centrifugal advance. Mark to shoot for is 52 degrees and I'm spot on.

I don't think so. According to Lars, you want a combined actual timing at idle of about 30 degrees (initial plus vac. adv.).

Mar 19, 2014 | 11:12 PM

#22

lars

Tech Contributor

Joined: Aug 1999

Posts: 14,356

Likes: 6,332

From: At my Bar drinking and wrenching in Lafayette Colorado

Quote:

Originally Posted by bwinterstine

No. Initial is at 16 with advance hose disconnected and plugged. Vacuum advance adds another 16 for a total of 32 at idle. Mark to shoot for is 36 degrees so I could still add 4 more degrees.

I measured the cruise timing today which is the total of initial timing, vacuum advance and the centrifugal advance. Mark to shoot for is 52 degrees and I'm spot on.

Those numbers look just fine. The 36-degree target is total centrifugal advance plus initial - not total combined timing at idle. Your idle timing with vacuum at 32 is right on the mark; your initial timing looks good; and total combined timing at 52 is right on the mark, so your timing is no longer an issue - your total timing is likely right in the ballpark.

Now richen up that carb and you'll be in good shape.

Lars

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