Question about HP Boating
You need to know the horsepower, as some of the B numbers are repeated on various engines. The HP should be on the serial number plate. HP is listed on the chart, and you can also tell the maximum HP which should be on a sticker on the boat itself. For instance my 16 foot Boston Whaler says Max HP is 60HP, so I would be looking for an HP designation on the label that may say 40, 45, 50, 55, or 60.
Mercury Outboard Serial Number Guide
Posted on May 20, 2018
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Posted on Jan 02, 2017
Ihave a 1991 70 hp Johnson outboard thats hard to start the first time but starts good after that. Seems to be flooded. Starting rpm seems to be low.
Posted on Jul 25, 2009
breaker/maker. set @ 020" @ the highest point but what is you're real problem. Run only champion spark plugs. We spenta dAY @ omc'S SERVICE CENTRE BEING SHOWN WHY. tHEY KNOW BEST!!
Posted on Oct 20, 2009
assuming you are not out of oil in your oil reservoir you probably have a bad sending unit in the reservoir. never bypass it or eliminate it as you could permanently damage your motor or ruin it if you ran it out of oil.
Posted on Jun 20, 2010
SOURCE: older mecury wont pump water
Never had a good water pump caviate. You may have a problem with your powerhead causing exhaust to enter the cooling system. This could be any thing from the head gasket beginning to fail, the exhaust cover plate and baffle having gasket or corrosion issues or even the powerhead base gasket or water tube "O" ring being rotted out from around the inlet pipe.
Before you do any of that-- pull the drive off the motor, drop it in a bucket of water and spin it with a big drill. If the key way is in correctly it should spit water vigorously out the outlet.
When you put it back on, put liberal grease in the pump outlet and check the "o" ring burried down that hole. Then find the tube guide and put it on the pump at the outlet. This will make sure the tube actually goes in the pump.
So now you are sure the pump works and the tube is in the pump, with this knowledge-go on the search for the real problem. I would first drop the exhaust plate off the side of the motor. Take the baffle to the wire wheel and clean the scale off it and hold it to the sun look for pin holes. Inspect the gasket areas for burn outs. If the gaskets are in good shape- leave them alone and put some sealer on the clean side. You can do more harm than good by scraping a perfectly good gasket.
Next would be pull the power head. This will give you a look at the water tube where you can check for pieces of old water pump. They get stuck where the water tube from the pump enters the power head base. Also see if the tube has been pushed up into the power head a blocked the water flow. If so just push it back into the pump.
Last is the head gasket. Just put in a new one. Look for burn outs and carbon tracts into the water jacket.
If none of this works- I don't know what to tell ya.
Posted on Jan 23, 2012
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