Webers wont hold cruise rpm

[saltshaker]

Only around that rpm range
Jon

[Gaz64]

Jon,

Sounds like a majority of your problem is twisted shafts, generally from tightening the lever nuts.

Take all carbs off, back out the idle speed screws and observe the throttle plate balance one carb at time.

You'll quickly see what's going on.

It then becomes a matter of a twist and adjustment of blades within the bores.

Everything to do with throttle control should be on the lever end, nothing on the other end. I also run my carbs with all the speed screws resting of the linkage. I run centre mounted heim jointed linkage, my carbs have stayed perfectly balanced since I fitted them.

[saltshaker]

Got the carbs synced and fix the problem with fuel drippingin the barrel after the motor was shut off. Problem was that the idle jets wern't seated and fuel was going around them. Also noticed on several barrels that the idle mixture screw doesn't shut down the motor when screwed in. I was suggested that on those mixture screws that the spring be taken off to see if they could now shut tje fuel supply off. Going to try that tomorrow...
Last, one barrel isn't working on the idle circuit.... Pulled te
He carb apart and the passage where the fuel goes from the well to the idle jet is clogged. I ran out of gas last week....going to fix that tomorrow and hopefully it runs much better!
Jon

[saltshaker]

The plug on #6 is wht, the idle circuit is rough up to 2k and smooths out.
Rebuilt the carb over5/6 and still have the problem
Jon

[jhirasak]

Jon

You mentioned that you had a LM-2 wideband O2 meter. What does it show from idle to 2500 rpm as you gradually increase the speed? Does it go rich or lean just after idle and then come into normal range as you approach 2000 rpms? It would help to know how your A/F ratio varies as a function of your rpms.

The white plug in #6 suggests that you might also have some debris in that idle circuit. It is worth a check to make sure since you did have debris in other cylinders.

John

[saltshaker]

With the carb back off I took a picture inside the runner and the sealant on the gasket on the intake side is compromised over cylinder #6 and the gasket has to be replaced. That will solve the lean cylinder
Jon