QuestionQUESTION: Hi. I bought a carburetor (Walbro WT-628) for my trimmer, but can you tell me if they are difficult to adjust? I adjusted the idle screw to where the trimmer head isn't spinning, but the engine dies after a few seconds of throttling. It seems to idle fine for some time, but eventually dies.
Here is what it sounds like: http://soundcloud.com/jarbs2154/trimmer-3/s-7V6Up
Thanks
ANSWER: What trimmer do you have? Has the carb been rebuilt?
If you have an air/crankcase leak or low engine compression the carb can be very difficult to adjust.
Let me know the brand and model of trimmer you have.
Eric
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QUESTION: Poulan Pro PPB200. The carb is new, and the compression was checked out as being good.
ANSWER: What was the compression reading? How many PSI? Had low compression on 2 Poulans. If it is less than 100 PSI it will not run right.
What about an air leak? I've lots of Poulans with a leaky crankcase o-ring. Will not ever adjust or run right with an air leak.
These are the two most common problems I find with Poulans where the carb will not adjust.
Eric
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QUESTION: It wasn't that the carb wouldn't adjust, it was that I was wondering if it is difficult to adjust. I have never done it before. Following the manual, I adjusted the idle screw, and had planned on getting the tool to adjust the high/low screws. A shop had told me previously that the compression was good, although I'm not sure if they checked for leaks.
AnswerMost manuals state to set the initial setting at 1 and 1/4 turns. However, based on the link below, this is changing.
http://www.walbro.com/techtips.aspx
The service manual link below is very helpful as well.
http://www.walbro.com/techtips.aspx
Can you send a close of picture of the needle adjustments? Sometimes you can use other or modified tools and not have to buy the "special" tools.
Eric
