Martin

[styles038]

I'm just finishing rebuilding a old 4.5hp martin motor and i was looking for some information. I tried running the number on the motor to find out what year it was but i think its just the serial number (B 47982) and i can't find anything. This is the only visible number. From what i know it looks to be about a mid 50's. The other question i had was fuel mixture. Depending on the year i think 50:1 might be a little to much for this motor. Does anyone know what is called for (32:1 maybe)?

 

[styles038]

Re: Martin

okay, i just found out its a 1947 - 1950. I need is the fuel/oil mixture. One other problem i just ran across is a spark issue. I did not replace the coils upon rebuild because they looked alright. I set the NEW points to .020 and put on new wires and boots. I am not getting any spark now. Coil issue??? If its not that i don't know what else it would be.

 

[F_R]

Re: Martin

Fuel mix is 16:1. Never 50:1. It has aluminum connecting rods.

Are they the orange shellaced coils? They are dang near bulletproof unless the raoches ate them up.

Wico points have a little pecularity in that they develop an almost invisible oxidized coating in storage which is non-conductive. Check them with an ohmmeter on less than 1-ohm scale. Or just clean them lightly with some 400 or 600 grit paper.

 

[tmcalavy]

Re: Martin

You need to visit www.martinoutboards.com
Lots of info there.

 

[styles038]

Re: Martin

Thanks for the info. They are the orange coils

 

[styles038]

Re: Martin

Is there a way to check and see if the coils are good? Do they ohm out or anything. I haven't had to deal to much with them beside putting new ones in.

 

[F_R]

Re: Martin

Resistance of the primary winding should be less than an ohm. You need a meter that is capable of measuring such a low resistance to check that, otherwise it will just show a dead short (zero ohms).

Resistance of the secondary is several k-ohms.

Heck, I always just assume those orange coils are good unless proven otherwise. They are that reliable.

 

[Chinewalker]

Re: Martin

Those brass cased condensers can be troublesome, though. I've replaced a few with generic OMC condensers and haven't had a problem...
- Scott

 

[F_R]

Re: Martin

Scott, How did you connect the Wico points wire to OMC condensers?