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Routine flushing of Yamaha 25 fourstroke

L

longridr

New member
Just bought a used boat with 2

Just bought a used boat with 2001 Yamaha four-stroke. This is the newest motor I've had since the 80's. My question: This motor has a built in "flushing device" on the motor. Is it good practice to just flush with that or should I still use the ol' ear muff style like I've done with every outboard for years?
 
"Doug, use the flushing hook u

"Doug, use the flushing hook up. It puts the water right into the water jacket of the motor and flushes from the head down through the exhaust - with the added bonus that you don't have to worry about getting a proper seal at the lower unit..."
 
"Doug, you can flush without i

"Doug, you can flush without it running and it will clean out the "guck" - alternately it may be run at idle speed only. But ultimately you really don't need to run it - gravity will get the water everywhere it needs to flush. You normally run with (muffs) to allow the water pump to get the water to the head - not needed with the direct flush..."
 
"you can flush with it running

"you can flush with it running, but not recomended
reason is not that much pressure to pump, plus you are BACKFLUSHING down to pump, while the pump is trying to push the water back up"
 
"Thanks for that info. So for

"Thanks for that info. So for running the engine periodically in the driveway, I should stick to the old ear muff method?"
 
I have a 9.9 yamaha 4 cycle ou

I have a 9.9 yamaha 4 cycle outboard that was layed down on the wrong side. Fuel got into the crankcase. What do I need to do to clean out the crancase and prime and restart the engine?
 
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