Posted by Steve@Advance on June 27, 2016 at 18:49:35 from (107.203.134.67):
In Reply to: Tecumseu posted by Harry Keller on June 27, 2016 at 18:23:06:
The surging and hard start are symptoms of being too lean. That is a common problem with the newer motors, especially the ones with no mixture adjustments on the carb.
Too lean can be caused by a vacuum leak. Be sure to eliminate that possibility before proceeding. It can also be caused by dirty or water contaminated fuel. Take a look in the bowl of the new carb, see if there is any sign of contamination. If so, clean it thoroughly, look in the tank, clean it and the filter.
If the carb has mixture adjustments, try enriching the mix by turning then out slightly.
If there are no adjustments, now that you have another carb, you can try some rejetting. This is a somewhat tedious procedure and requires some tiny drill bits. You'll need to locate the main jet, determine the size, then drill it out .001" at a time, trying it at each interval. It won't take much! But you do have a spare to fall back on just in case!
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