Stating the obvious.. you guys are using different holes on the bottom linkage.
I'd be interested to hear if switching that hole makes such a big difference.
I'm still learning about snowblowers and governors and such.
The idle screw was set to just open the throttle. I don't think the
governor is working properly. Got it to idle-down without runaway
RPMs but couldn't adjust the engine speed high enough. I tried to
adjust the governor but it didn't make any difference.
Governor is probably toast. It is a plastic gear assembly bolted inside the rear crankcase cover. Here's a photo of what it looks like. Not a hard repair, but you'll most likely need a case gasket as well as the governor.
OK. Comparing the 2 linkage lever pictures, I can tell you that the linkage lever (the one with the holes in it) on mine does not move to the left enough to expose the top mounting screw, even with the throttle lever wide-open. What might cause this?
I hate to be a downer but in my opinion it's very unlikely that's the problem.
The way that spring works is that when the engine speed control is at a high setting, the spring is put under tension and pushes the throttle plate open. When the RPM increases, the governor in the engine counterbalances the force of the spring and gradually closes the throttle to regulate the RPM at the desired value.
When the speed control is set lower, the tension on the spring is reduced so it pushes the throttle open with less and eventually zero force, allowing the throttle to close further and lowering the RPM. As others have mentioned, there's a screw that limits how far the throttle can close, and if it's screwed in too far the RPM will not be able to go to idle.
There's no way I can think of that the actual spring could fail in such a way that it provides more force when you lower the speed setting. That could possibly happen if the spring were installed improperly, but in that case the solution would be to reinstall it correctly.
Is there any way you could post a video of the behavior you're seeing? It would be very helpful to be able to see what the throttle plate and linkages do as you move the engine speed control from high to low.
The previous owner installed a carb that isn't for an HSK70 engine.
It doesn't work correctly as the carb linkage holes are all in the wrong places and had the effect of keeping the throttle plate closed, rather than holding it open and allowing the governor to control RPM.
It was slightly opening the throttle plate when shutting it off because the geometry is all wrong.
Take a look at the pic I posted. The carb linkage is hooked to the right of the throttle shaft:
This pic shows the correct carb. See how the upper-right linkage hole is ABOVE the throttle shaft? The wrong carb has the linkage holes to the right of the throttle shaft, not above as it needs to be. This completely messed up the angle of the carb linkage and caused it to not open the throttle plate.
I took this out of pops shed. I believe he purchased it circa 1996 from Home Depot. It has not been run since at least 2004 or so when he got a small Toro single stage snow thrower.
Pop's gone now and we are cleaning out of his shed. I found this and I decided to bring it back to my place. FYI...
Not a snowblower, but same technology !
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