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Outboard surging and occasionally backfiring - Boating

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Yamaha outboard 15lh backfire or missing low rpm


Hello Bill, have you replaces the spark plugs? Do this first.
If it still backfires/misses.. have the carb cleaned and set by a competent professional.. if it still does this, remove the flywheel and see if one of the magnets has broken or come loose...(my own experience!)

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2 Answers

Motor backfires, does not start, just had the motor redone, seems like timing is out although it has electronic and not points


what engine do you have , inboard or outboard ?
inboard , tdc number one cyl and check lines up with number one pin on the distributor cap and the timing mark aligns with housing !? if out the readjust !
outboard , tdc number one cyl and check flywheel marks line up with casing !?
remove flywheel and check keyway not broken or missing !

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1 Answer

Why does my 1991 60 hp Evinrude outboard alarm sound and motor sputter occasionally?


when the alarm goes off is the engine getting hot, try running it in gear under load while tied up and with the engine cover off see how hot it gets and if the water i circulating all the time , might have cooling problem !

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1 Answer

Why does it backfire and quit after riding for 1 hour?


is it running out of gas? backfire is caused by a lean condition. I'd check the fuel path from the tank to the carb and clean the carbs. could have something floating around in there occasionally blocking fuel flow.

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My truck backfires occasionally and misfires.


Check fuel pressure. When does it backifre, Idle? on accel? cruise? all the time? sometimes? help us help you.

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1997 Lincoln town car 281 cu in engine. The intake manifold was replaced due to the thermostat housing crack failure. Since then, there is an idle surge that disappears "off idle" -- about 1500 rpm. The...


Dirt may have got onto the O2 sensor, this could cause a surge without the light coming on. Some debris may be on a sensor preventing the computer from making correct adjustments.....

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1 Answer

Briggs and Stratton outboard. I have a 5 hp briggs outboard that we have cleaned out pretty good. The carb has been cleaned also. The engine will start and idle perfectly but when you start to throttle it...


If you have started the engine out of water, you may have locked up the lower end, the prop gear.  If you think it is the carb or a fuel problem, try and get your hand over the carb when you rev it up. if you put your hand over the carb right as you rev it, then pull it off, she will pull more fuel in and should go on to rev up. if this works you still have a port cloged in the carb. 

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