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same as a car engine
150-165 psi with a variation of no more than 10% between cylinders
contact a service center and ask them for the compression pressure and how to do the test
? 2:29 www.youtube.com/watch?v=sMmionreldM Dec 29, 2012 - Uploaded by Peter Richards
Engines for 1989 Larson boat with dual 115 Yamaha 4 StrokeEngines. ... Outboard Yamaha 150 HP DIRTY idle JETS, Motor will not idle .
Sounds like the contacts in the key switch are faulty. If possible get another switch temporarily and just see. Plug it into the harness and see what happens. What exactly are we talking about? Bike, outboard?
not enough information on the motor. what year and model? but all yamaha outboards are shut down by the C.D.I. being grounded by the key switch or the emergency kill switch. the cheapest thing to test or replace is the key switch and the emergency kill. with more info on engine I can help you further.
sounds like the ground wire in the control box where your key switch is located is broken are disconnected. check the wiring harness plugs if it is unpluged are not pluged tight it will not shut off
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