mercury 25hp

[dirtrider212002]

Hi there i have a 1988 mercury 25hp. I took it into a marine engineer and he has said that the big ends are knocking and that it needs a new carb/clean. i am confident with 4 stroke engines and have rebuilt many. I was thinking that the trasition to a 2 stroke would be fairly easy. The only problem is how easy is it to get the parts for an engine of this age and where would i get them from (parts like big end bearings) finally how easy is it actually going to be. Thanks

[Turbodiesel]

Originally Posted by dirtrider212002

Hi there i have a 1988 mercury 25hp. I took it into a marine engineer and he has said that the big ends are knocking and that it needs a new carb/clean. i am confident with 4 stroke engines and have rebuilt many. I was thinking that the trasition to a 2 stroke would be fairly easy. The only problem is how easy is it to get the parts for an engine of this age and where would i get them from (parts like big end bearings) finally how easy is it actually going to be. Thanks

You will be fine for engine parts for that engine. If you know what you need and need help send me a pm and we will sort you out with part numbers etc and put you onto a local dealer were you can get them from. Will need a serial number. 2 strokes are very very easy to do a rebuild on!, no valves or cylinders heads, timing etc to worry about!!!

[dirtrider212002]

Right then. I have taken the carb apart this evening and have found the problem. Basically i have got a blockage due to corosion in a part on the carb. It is where the float is housed as well as the pin for the choke. It is bolted up by one brass bolt to the main body of the carb. The serial number for the engine is 9425602 (this was taken off a plate on the leg ). If someone could tell me where to get the part and how much it would cost it would be much apreciated. Thanks Nathan

[Nos4r2]

Personally I'd carry on stripping it til you know the extent and cost of sorting the big ends too. It might work out cheaper to buy another engine.

[dirtrider212002]

i would like to get it running first just so i can asses that the big ends are definatly gone. Plus the carb is easy to put on and off so its no hardship.

[Nos4r2]

Originally Posted by dirtrider212002

i would like to get it running first just so i can asses that the big ends are definatly gone. Plus the carb is easy to put on and off so its no hardship.

Well... sort of. If you've not heard a 2 stroke roller bearing big end going, they don't sound the same as 4 strokes with white metal bearings. If it's electric start you should be able to determine if it's the big ends by lubing the bores up and spinning it over on the starter motor whilst using a screwdriver as a stethoscope.

[dirtrider212002]

No its not a electric start. Basically i took it to a guy who claims to be a marine engineer but he seems to have bulshited alot. basically i just want to get it running first. Anyone no where i can get the part.

[Dirk Diggler]

is it this?

[dirtrider212002]

yep thats exactly it i need part 4. where the float lives. Any idea where i can get it and how much. Thanks everyone

[Rogue Wave]

didn't turbo diesel make you an offer of help? failing that Marinautic are very good. if you can get the guy in the parts department he's very good