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Boat Repair/40 horse mercury 1990 oil injected

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Expert: Jeff Grigg - 2/8/2008


Question
Every year the high speed jets stop up and i have to have them cleaned , which is very expensive, i have used stabil and crank the motor every 3 months and this still happens. I cranked it today and it ran o.k. then stopped up.What can i do to stop this and is there any way to unstop them my self

Answer
Tim, while stabilizers are needed they, as you have found out, don't totally protect from gum formation. Make sure you use a good filter and it is clean. After use look for the small drain screws on the bottom of the carb's float bowl. Take them out and let the fuel drain into some paper towels. Dispose of them properly. This way there will be no fuel in the bowls to turn to gum and varnish.
Jeff

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Jeff Grigg

Expertise

Can help with most any question related to outboards, high performance, hull repair, rigging, if it floats and uses a motor. From a 9.9 on a aluminum boat to DFI two strokes. Outboard motors are my specialty. I can help with some I/O questions as well. Ratings are the only way we know if we are helping. If you are pleased with the help, please rate us. 20% don't bother reading my answers! If you are not going to read the follow up then why ask? Keep in mind we do this at no charge and are not paid. We do it to help you!

Experience

32 years in the marine business. Own a service facility, in coastal South Carolina certified Master Tech by Johnson/Evinrude, certified Mercury/Force, Tohatsu/Nissan. Former technical director for DMI Pistons. 30 year racing career including 3 APBA Formula V National Championships

Organizations
AMTECH, APBA

Publications Written For
Boat & Motor Dealer, Car Classics, Custom Vans (tech articles), Miami News, powerboat racing column

Awards and Honors
Certified Master Technician Johnson/Evinrude

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