72 johnson 125

[natedawg]

I was just woundering if this is a good motor havent started it up yet. Just woundering if they are known for having any probs. Going through all the stuff posted on a sitting motor startup. so far so good, thinkin of decarbing it too. <br /><br />Thanks<br /> Nathan

 

[WillyBWright]

Re: 72 johnson 125

Wwlcome to iboats. <br /><br />That motor has three things worthy of special attention. First is the pistons. They break easily if carbon builds-up in the ring grooves. Be religious about doing a de-carb annually.<br /><br />Second, the ignition system is touchy. All it takes is a loose or corroded battery connection to blow the amplifier ($300+). Keep them clean and tight. Finger-tight wingnuts ain't good enough. Get out the pliers!<br /><br />Third, it's electric shift. They're obsolete and what parts are still available are quite pricey. Use the right gearlube and don't let it get low or black.

 

[natedawg]

Re: 72 johnson 125

cool thanks i hope to have my boat in the water soon everything is looking good so far next im going to do a compression test so wish me luck.

 

[javsam]

Re: 72 johnson 125

good points willy,I have this same motor and it is a good motor.the cdi packs are expensive , and don't ever try to jump that motor also as stated have tight wingnuts on battery posts.<br />javsam

 

[Texasmark]

Re: 72 johnson 125

Back in '72 I bought a 125 Johnny. Put it on a 17 1/2 trihull...trying to remember the name. (Just Did....Caravelle) Used it for 4 or 5 years and really used it, water skiing and fishing and all. Had 4 kids and we all liked to ski and fish.<br /><br />Had zero problems and it ran out pretty good considering I had propped it for skiing....had a 13( ) x 17 (OMC SS)I think, or a 19; think it was a 17. Ran 39 with just me. <br /><br />I remember on one occasion we were at a company picnic and just for fun we got 5 skiiers up with it. Took some work and didn't go very far before one fell off but we did it; 2 slaloms and 3 with doubles.<br /><br />Sold it to a guy who overloaded it and ran it 40 miles up the intercoastal canal to a fishing hut. Burned a hole in the piston and some other things. That was not the fault of the engine. He was lugging it and running at WOT for an hour.<br /><br />HTH<br /><br />Mark

 

[Texasmark]

Re: 72 johnson 125

Yeah it did have a problem. It was cross-flow and was in love with the contents of the fuel tank. If you plan to do much running, get a looper. Won't regret it, especially with the current prices of gas.<br /><br />Mark