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Boat Repair/Compression Check

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Expert: Jeff Grigg - 2/4/2008


Question
My 1992 60 hp two stroke service manual does not mention grounding out the ignition in the proceedure to check the compression. Do I need to do this? Or will create a mushroom cloud in my neighboohood when it catchces on fire?

If I do. Can you tell me how to ground the ingnition or offer me a trick of the trade?

Thanks in advance.

Joe

Answer
What we do at the shop is use a spark tester that can be used on all the cylinders at the same time, or crank the motor with the ignition off. You can do this by pulling your safety kill switch and cranking with your key. The other way is to use a starter switch directly on the solenoid with the key off. Both ways no spark.
If you don't have the ignition off, or you do create an ignition spark while checking compression, you will not create a mushroom cloud. You could however singe your eyebrows or even catch the engine on fire. Real spectacular at night! Play it safe, turn the ignition off.
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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