Low Idle SH

GordoSD · May 25, 2012

Thanks to the ignition experts my SH is starting quickly. Now I'd like to get the low idle down. I'd guess ir is 750 plus. Idle stop screw is off the stop, Idle bleed screw AJUSTED.
So I think I need to go to the spring adjust mechanism in the throttle rod.
How do you adjust that double spring "thingy" exactly and how is supposed to control idle or hi speed control? I
I love to hear an H just purring along at about a 400 rpm idle.

The Red · May 25, 2012

Set your throttle lever to idle. On that spring assembly, loosen the outer bolt and tighten the inner bolt so the assembly is moving forward on the throttle shaft. That should bring the idle speed down.

Bob M · May 25, 2012

Had the same problem with my SH. Turned out the governor to carb linkage had a bit wear and needed readjusting.

Here's the procedure:

Remove the gov riser cover (sloped cover at the top of the gov). Remove the cotter then pull the connecting rod pin from the bellcrank. Loosen the bellcrank locknut.

Next pull the connecting rod upward and rotate the carb throttle shaft clockwise so both are against their stops. With the parts held in this position the bellcrank pin should fit freely into the bellcrank. If it does, adjust the bellcrank up or down on the connecting rod until the pin fits freely.

Finally replace the cotter pin and tighten the bellcrank locknut.

----

If that doesn't do it, remove the governor side cover and check the idle speed adjustment screw (the upper screw on the gov input lever). With the gas handle set at "idle" the screw should be against the stop. If it isn't adjust the throttle handle to governor rod length until it is.

Now test the idle RPM. If it STILL idles too fast, adjust the gov idle speed adj screw as required.

David G · May 25, 2012

Gordo, What was issue and solution?

GordoSD · May 25, 2012

Outer nut is as far "out" as it can go. But it was a little jammmed up. I sprayed the entire assembly and the pivot and I got her down to just ticking. Thanks guys.

GordoSD · May 25, 2012

Previous issue was no spark. Solution was reset points.

The Red · May 25, 2012

Good deal. At least I haven't lost all my touch. I had that same issue on one H several years back.

David G · May 25, 2012

Where they not closing or opening, think I remember.

Low Idle SH

GordoSD

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The Red

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Bob M

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David G

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GordoSD

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GordoSD

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The Red

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David G

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