Tecumseh HSK70 Over-revs shutting off - Snowblower Forum : Snow Blower Forums
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post #1 of 18 Old 01-07-2016, 10:32 AM Thread Starter
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Tecumseh HSK70 Over-revs shutting off

Working on a Toro 724 like the one in the pic. It runs fine at WOT but over-revs when putting the throttle lever in the idle position. Can anyone tell me if the linkage to the carb is correct? Thanks.



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post #2 of 18 Old 01-07-2016, 11:37 AM
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Took this pic from the same model....there should be a idle adjusting screw on the carb that will allow the throttle butterfly to close more to get the desired idle speed.

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post #3 of 18 Old 01-07-2016, 03:28 PM
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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.
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post #4 of 18 Old 01-07-2016, 03:36 PM
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the linkage arms look bent to me
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post #5 of 18 Old 01-07-2016, 04:12 PM Thread Starter
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Thanks for the replies. I moved the lower-left rod up to the next hole
and it is still doing it.

Jackmels: can you confirm that the upper linkage goes to the carb
as shown in my picture? I've only seen them go from the carb to the governor. Thanks.
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post #6 of 18 Old 01-07-2016, 05:18 PM
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Top linkage goes to carb. Did you adjust the idle screw on the carb to close down the throttle? Does the Governor kick in at WOT?
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post #7 of 18 Old 01-08-2016, 09:52 PM Thread Starter
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Quote:
Originally Posted by Jackmels View Post
Top linkage goes to carb. Did you adjust the idle screw on the carb to close down the throttle? Does the Governor kick in at WOT?
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.
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post #8 of 18 Old 01-08-2016, 10:50 PM
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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.
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post #9 of 18 Old 01-09-2016, 08:28 AM
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I'd disconnect the governor and run it and see if the governor lever pushes harder with more RPM. Post more pics of the arms and governor.

'77 Ariens 924032 "Brick House" Re-Powered with a TEC 10HP and oversize auger pulley
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post #10 of 18 Old 01-09-2016, 05:33 PM Thread Starter
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I took the cover off and the governor looks good. I expected to find broken
pieces of plastic but didn't. The spool also lifts when moving the arm.

I am going to change the intake and carb gaskets and then go over the linkages and governor adjustment again. Thanks for the replies.
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