Mercury Outboard & Mariner Outboard Troubles/Repair | Forum profile

Quote: Originally Posted by newboater74 Thanks. The motor runs great, it has a pull cord on top in addition to the electric start. The problem with the current control box is that the throttle is backwords. What should be wide-open for both forward and reverse is actually slow/idle. The guy who had the boat before me didn't remember what wires went where for the electric start. I tried to figure it out, but nothing I tried seemed to...

Is it me or has there been quite a few of these requests the past few days? Mods....I have a nice PDF file containing serial numbers, hp, years for Merc...great reference. I know many people would love to see this info. Is it possible to send it to you or upload it and turn into a sticky?

1975

I was leaning towards 1978 as its an aussie motor, how did you come up with 1975, I am not saying your wrong just maybe you didnt realise it was an aussie model thanks

I own a 2003 Mercury 225 hp EFI and replaced the older dashboard gauges with newer ones. With the gauge package came a water pressure gauge. To make the gauge operational, do I have to install a sending unit on the engine?

I have a question or two about my motor. My motor is on a 16 ft. flatbottom and tops out at around 5 mph. It gets to this speed just before I turn the throttle all the way up. When I max out the throttle the motor will rev up but I get no more power. Is it a problem with the prop or something else? Thanks for the help!

Quote: Originally Posted by OldMercsRule Question: does yer engine have a square three position choke knob : and is the kill switch on the starboard side of the power head? (The later models had a round two position choke and the kill switch at the center of the powerhead). Thanks in advance fer yer answer. JR Yes, it has the square three position choke. Haven't looked at the kill switch yet.

Normally water pressure gauges are mechanical. You would install a small tube from the cylinder head to the gauge. Hopefully you can find a plug on the cyinder head's water jacket in which to install the fitting.

Hi, I just got 4 HP MERC 40 that seems to be 1969 judging on Serial # 2678618. It does not have spark plugs. Does anybody know what I should use. Tnx.

That serial number comes up as a 1997 0r 98 2.5L V200 EFI but I'll admit that merc numbers get a bit fuzzy once you get past 1996, data bases are not reliable. The impeller part number is 47-899841 The water pump repair kit part number is 46-96148A5. iboats sell the Sierra brand equivalent, part number 18-3217 (no housing or base)