28hp '63 or '64?

[jeepers]

Hey all,

how can i identify whether the engine i inherited is a '63 which requires a mixture of 24/1 or a '64 which requires 50/1?

i have run it for about 2hrs with 50/1 and the plugs look good but i'm not sure if that's long enough to know? Is there something that will tell me if i've got the wrong mixture after 2hrs?

it does seem to lack power but then i'm no expert. it pushes a 14' fibreglass boat and if i'm alone i can get it on plane but if i have anyone with me i'm plowing water.

thanks in advance,
dean

 

[JB]

Re: 28hp '63 or '64?

It is really quite simple, Dean. The model number of your engine can tell you whether it is a '63 or a '64.

If it is RX-11 it is a 1963 and if it is a RX-12 it is a 1964.

The specs on the engines are identical but it is unknown what, if any, changes OMC made in the manufacturing that might justify the change in the recommended ratio.

If you are running a '63 RX-11 on 50:1 it might not complain in 50 years. Those are tough engines.

I think some 14' fiberglass boats are too heavy for 28HP, but most should get up and scoot. It depends on what HP the boat is rated for.

It might also depend on how it is propped and rigged. Do you know what rpm it is getting to at WOT?

 

[jeepers]

Re: 28hp '63 or '64?

Hey JB,

Thanks for the reply. Where will i find the model number? The plate indicates 28252C and engine stamp indicates 28252.

The boat is rated for a 40hp. The boat is also pretty old. Most likely late 60's/early 70's.

I don't know what RPM it's running at but figure i'm going to need to figure that out somehow. No tach onboard but i'm sure there's a tool for it; i just need to find one. As for how it's propped and rigged; well that's still a foreign topic for me but i also figure that i'll have to educate myself on this as well. The engine came with a prop that looks a bit banged up (at least to me) there are pits and gouges in the edges of the blades, some as deep as 1/4". To me it seems a bit rough but i wanted to make sure the thing would actually run before getting in too deep. The engine sat for 10yrs without seeing the water. What do you mean by "rigged"?

thanks again,
dean

 

[JB]

Re: 28hp '63 or '64?

28252 looks like an Evinrude model number, but there is no such model listed.

You might have copied it down wrong. Check again. You never said whether it is an Evinrude or a Johnson.

That engine should plane a boat rated for 40 quite easily. You might be running on one cylinder.

If it has not been run in 10 years, go to the Engine FAQs forum and do "Awakening a sleeping outboard".

 

[jeepers]

Re: 28hp '63 or '64?

Hey,

Ack! Yeah it's an Evinrude. 28252 is definately what it says. I have searched high and low and have seen lists of model numbers that simply skip this number but both the plate and the engine stamp are very clear. <shrug>

Well, i know it's using both cylinders because during one of our excursions i experienced really slow speeds and found that one of the plug wires had popped off during transport (need to redo the ends). However, i will check out the FAQ and i've been reviewing the tune-up routine on how to get the throttle linkages adjusted and the needles set.

Again thanks for your assistance, it looks like i just have to wake my sleeping giant but does the Model 28252 ring any bells?

thanks,
dean

 

[jeepers]

Re: 28hp '63 or '64?

Hey JB,

You were right on the head. I spent some time with the needles and she's starting to purr.

thanks for the help,
dean

 

[jeepers]

Re: 28hp '63 or '64?

Hey JB,

I was going to post this in the other thread.

Sorry, i didn't realize i was out of line. I just saw that this thread had taken a turn in topic (a most helpful one) and thought that the model number in the subject may be more effective.

Please accept my thanks and apology.

best regards,
dean

 

[56 rude]

Re: 28hp '63 or '64?

your engine model numbers fall right between 62 which is lower number and 63 which is high number.heres what i found on the evinrude pdf. of outboards from 1913 up,28202-1962,28203-1962,28303-1963,28352-1963.

 

[Vic.S]

Re: 28hp '63 or '64?

Here's what I said but the thread I replied to has ben closed. !!!! ????

Re: Evinrude 28hp Model 28252C - What year is it?

--------------------------------------------------------------------------------

I cannot find that number either.

On the basis that 28452 is a '64 and 28352 is a '63. I'd assume it was a '62. At least thats the safe option as far as oil ratio goes. (others begining 282 are '62 models)

Maybe someone knows better.

 

[jeepers]

Re: 28hp '63 or '64?

Hey Guys,

Thanks for the replies. Vic.S and 56 Rude, i have found all sorts of documents that just skip over the model number that i have though this one http://www.old-omc.de/index2.html indicates that the 282xx models are European???

I never noticed the pattern in the model numbers that suggest (pretty strongly) that the 3rd digit indicates the year. That, combined with placement in the lists is pretty strong evidence that it is a '62 and i'll treat it as such.

Thanks again all,
dean