Re: carb adjustment on OMC 18 hp

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July 21, 2015 at 1:02 am #20506
chris-p
Participant

    Simply one that is adjustable, with an open air gap. One like this

    http://www.ebay.com/itm/Thexton-404-Adj … 76&vxp=mtr

    The open air gap mimicks the cylinders compression. There are ALOT of times a motor will spark when you hold the plug against the block. You think you have good spark, when you don’t. It is easy for it to do that, only has an 030 gap to jump, but will not jump the gap when installed in the cylinder, nor will it jump the 1/4 inch gap.