Mariner 3.5hp what year

[mjb55]

Hi Guys.<br /> Hopefully this question is in the right section.<br /><br />I have a 3.5hp single cylinder air cooled mariner outboard (Japanese)with the following information on the Identification plate.<br />642S 11900. Can someone please tell me what year it is and also the sparkplug and point gap.<br /><br />Great site guys keep up the good work.<br /><br />Thanks in advance<br />Michael

 

[roscoe]

Re: Mariner 3.5hp what year

1974<br />Plug, NGK B6HS or Champion #5933<br /><br />Sorry, no point gap info.

 

[lark2004]

Re: Mariner 3.5hp what year

ok, what about 642L 3981?<br /><br />Hey Michael, does your timing move with the throttle, or is it fixed? I have been tring for a while to get an answer to this, and keep comming up with blank answers.

 

[Paul Moir]

Re: Mariner 3.5hp what year

Lark2004 - any 0s in front of the 3981? How many please?<br />I've found a couple sources telling me the gap should be .6mm. The Champion site says 1mm but I think that's an error.

 

[mjb55]

Re: Mariner 3.5hp what year

Hi Lark2004,<br /> Will check outboard and see if timing fixed or moves.<br /><br />Thanks guys for Year info, hopefully I will now be able to get manual and get specs for sparkplug and point gap.<br /><br />Regards<br />Michael

 

[lark2004]

Re: Mariner 3.5hp what year

nope, no 0's in front. will take photo of plate when I get home tonight and post it.

 

[mjb55]

Re: Mariner 3.5hp what year

lark2004,<br /> The information regarding the timing I sourced out of the local Library Mariner Manual.<br />As quoted direct from it : <br />Mariner 3.5<br />" The breaker points are mounted on a fixed base. Ignition timing on this model is non-adjustable. Correctly adjusted breaker points will produce the specified timing. If the point gap is too large, timing will be delayed; a gap that is too small will advance timing"<br /><br />Also plug is NGK B7HS gap 0.019 to 0.024 in.<br />Point Gap 0.012 to 0.018 in.<br /><br /><br />Regards<br />Michael

 

[lark2004]

Re: Mariner 3.5hp what year

Ok, on a much closer inspection of the ID plate (Microscope!) I found that the last number has been put over the rivet hole, hence the odd sounding number. <br />So my model number is actually 642L 39811. any help with year would help.

 

[Paul Moir]

Re: Mariner 3.5hp what year

Ah, that does it!<br />642-37631 to 642-40390: 1975 3.5hp<br />I think that makes it a Manual Start Longshaft.<br /><br />There was an odd hiccup in the s/n range in '77 that the first number you posted could have been part of, but I would have expected leading 0s if that was the case.

 

[lark2004]

Re: Mariner 3.5hp what year

Thanks Paul,<br />At least I now know how old it is. Got to start putting it back together, dieing for a fish and the evinrude is months away from completion yet!