Walbro Carb Stalls on Load - defective high speed screw?


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Old 06-29-12, 07:28 PM
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Walbro Carb Stalls on Load - defective high speed screw?

Couple issues with an SV2AE older mantis tiller.

Mantis 2 cycle tiller stalls when at high speed. Attempted to adjust Walbro carburetor using instructions on Walbro website (and here). When I adjust the hi speed needle it has no effect. I can close it all the way and the tiller still runs.


Also has cracked Insulator between carb and engine which I understand could cause a vacuum leak.


Trying to determine if both need to be replaced or if the cracked insulator is causig the hi needle not to work.

I don't want to buy both parts if both are not needed.
 
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Old 06-30-12, 05:53 AM
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The screw - no. The fuel circuit is likely plugged. But replace the insulator - the vacuum leak can affect the mixture adjustments. It's more likely the circuit is plugged and you'll have to clean the carburetor to get it working.
 
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Old 06-30-12, 10:19 AM
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I have soaked and sprayed out the carb with cleaner. However, I did not remove the needle when I did. I will try spraying it with cleaner again with the needle removed.
 
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Old 06-30-12, 12:28 PM
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Yep, you want it down to the last little piece when you clean them. Spray out all passages, then put a complete kit back in it. Those aren't too expensive and in the older jobs they'll need one anyway.
 
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Old 07-13-12, 03:38 PM
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Cleaned again with everything removed and blew ouf with compressed air and after some adjustments to the needles ran great. Dethached lawn without any stalls. Thanks
 
 

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