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repowered old craftsman snowblower


dh7312's Avatar
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Join Date: Dec 2008
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12-30-08, 01:07 PM   #1  
repowered old craftsman snowblower

I have repowered an old gear drive craftsman snowblower and now it will not throw snow well? It had a 7 hp Tecumseh that did not run. The blower is close to 30 years old but in great shape. I put a 9 hp Tecumseh snow king on it, but now think the max rpm may be lower on the new motor. The centrifugal clutch has 12 teeth and the auger shaft has a 40 tooth gear. I have ordered a 30 tooth gear to try increasing the speed of the auger but cant go any smaller than that. I dont know if this will help much, any ideas?

 
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flopshot's Avatar
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12-31-08, 03:57 AM   #2  
have you checked the max rpm ? the sprocket might work but you'll be lugging the motor if it's not up to spec.

 
dh7312's Avatar
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01-07-09, 09:23 AM   #3  
i can not find the max rpm anywhere, i think it is lower than the old engine. i have been told that the old engines are 3600rpm and the new ones are 1700rpm.

 
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01-07-09, 10:34 AM   #4  
What part number is the new motor, 1700rpm sounds low.

 
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01-07-09, 01:58 PM   #5  
Max RPM on new engines is the same as the old engines. 3500-3900 RPM. If your engine is not runningthat fast, you have a problem with the engine.

 
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01-08-09, 03:59 AM   #6  
your machine was designed to run at a specific rpm. 1700 is not an operating rpm for a gasoline engine as it is not within the powerband of either a four stroke or two stroke engine.
proper engine speed for cooling is another issue.

 
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