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Discussion Starter #1
Hi,
This summer I was given a Poulan PR208 snowblower with an LCT Stormforce 208cc engine as a project to repair. I’m just getting into working with small engines.
It would not turn over. After investigation it was discovered that there was metal shavings in the cylinder as though someone had drilled out the spark plug hole at one time. The cylinder is in good condition.
After some cleanup and tune-up, including dismantling the carb, the remaining problem is that to run smoothly, the choke has to be set half way. If the choke is fully off, the engine will surge up and down.
I’m just wondering what I should be checking next.
Thanks.
Regards,
Hal
 

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Clean the main jet on the carburetor. These engine are emmision engines and any bit of dirt or varnish in the jet will make them surge. Remove the main jet and emulsion tube from the carburetor with a small flat head screw driver and run a small piece of wire up and through the jet. Many will slightly increase the jet size too since this tends to make them run slightly richer and gets rid of the need to run the engine with the choke on and prevents surging.
 

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Discussion Starter #3
Thank you for the help.
I cleaned the carb again and double checked the items you mentioned. All appears to be clear.
I still have the surging/hunting issue.
Some things I have not done, if you think it would contribute to the problem... I have not replaced the fuel filter in the tank, nor replaced any gaskets on the carb. I will explore other options when I get time.

Thanks,
Hal
 

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With the engine running, spray some carb cleaner around the mating surfaces where the carb meets the manifold and where the manifold meets the cylinder. If the engine tempo changes, you found an air leak and need new gaskets. If no change in tempo, the carb needs further cleaning or you possibly put the gaskets on in the wrong orientation. All the holes in the gaskets have to match the holes in the carb and spacer if so equipped.
 
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