Engine compression


Old 03-13-15, 10:08 AM
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Question Engine compression

I have 1997 Yardman Snowblower by MTD that has a 9hp Tecumseh HMSK90 156504C engine with two shafts coming out, could someone tell me what the compression should be on that engine as well as the max engine rpm. I would like to find out if the engine needs to be rebuilt if possible, and if the internal parts are still available. Being that Tecumseh engines like this are no longer available, does anyone no of an engine brand that would have two shafts coming out. The engine that I currently have has a stepped shaft, looks like 1 inch to possible 3/4 inch.

Any assistance would be greatly appreciated.

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Old 03-13-15, 08:39 PM
Join Date: Sep 2009
Location: USA
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If you have a good amount of hours on it the valves may need adjusting. The clearance should be .008-.012

Max RPM should be 3600 rpm.

Some internal parts are available.

Compression 80-100 minimum. Make sure the throttle and choke are wide open when cranking.
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