Welch plug serial no

[marcysibyll]

Is there a website that will give the year and HP rating if all I have is the engine welch plug serial no?<br />thanks

 

[Paul Moir]

Re: Welch plug serial no

We can sometimes look it up by referencing old Iboats posts. What S/N do you have?<br /><br />EDIT: This does not tell us the HP, but often that can be worked out easily enough.

 

[marcysibyll]

Re: Welch plug serial no

Paul, the ser. no. is j2968258. The mpower head is dark green, if that helps to narrow the search.<br /><br />thanks

 

[Paul Moir]

Re: Welch plug serial no

I searched this forum for J29 and turned up the following entrys:<br />J2985246 1968<br />J2974236 1968<br />j2968258 Yours<br />J2945926 1968<br />J2934597 1968<br />J2913741 1968<br /><br />And the colour green would match 1968 as well (for Johnson). So there's really no question about what year it is.<br /><br />As for HP, presuming this is an inline-2cylinder engine, here are the possibilities:<br />40hp: Roundish base (gasket surface), much larger than your 18hp. There is a thermostat tower on one side of the head.<br />33hp: Squarish base, much larger than your 18hp. There is no thermostat tower on the head, although the head is made of several peices.<br />20hp: Looks a *lot* like your 18hp.<br />9.5hp: Looks *very* strange. Carb comes off the back.<br />6hp: Looks "normal" but much smaller than your 18hp. There's a thermostat in the top of the head under a plate held in with three screws.<br />5hp: I think this powerhead is indestiguishable from the 6hp.<br />3hp: Very small, no thermostat (or thermostat cover) in the head.<br /><br />Hope that helps!<br /><br />(there is also a rare 15hp engine, but I think they were all painted grey)

 

[marcysibyll]

Re: Welch plug serial no

Thank you very much, Paul. I beleive that it's a 20 hp. <br /><br />This is the power head on my patchwork 18 fast twin. <br /><br />Now to get the throttle to work eqasily.<br /><br />\Thanks again.