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Old 03 March 2012, 10:43   #11
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i can see its a clam shell ,it doesnt seem a bad fault,(easy to fix)i managed to hear it now what i would do now is give it a service, go to a launch site run it on the trailer making sure that the obm stays in the water and doesnt push the vehicle and trailer back up the slope,run at quite high revs tickover to about 3500rpm in gear to make sure there are no flat spots if there is richen all carbs the same about one eigth of a turn on the mixture screws,remove spark plugs and look at the electrodes black to rich, white to lean then go from there
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Old 03 March 2012, 10:59   #12
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Thanks Uncle Al.

Sounds fairly good doesnt the old girl :-) for a 21 year old OBM.
now the starter is 100% she fires up in seconds.

I will take her down the coast and take your advice.

Its probably the carbs out.
reeds look ok or at least not stuck closed.

Thanks again
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Old 03 March 2012, 11:05   #13
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if it was reed trouble i would expect it to sneeze ,be carefull running it on the trailer as you havent got a dyno that is the next best thing , well better than nothing , i hope i sound as good as that when i am twenty one, dont nobody answer that
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Old 03 March 2012, 12:13   #14
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Well i'd do the same, a good service and a test run under load.

Let us know how you get on

SR
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Old 03 March 2012, 15:10   #15
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Quote:
Originally Posted by jezza2011 View Post
Hi,
Well started the old thing up again today and still noticing plug 3 is clean as a whistle while plus 1 and 2 are as they should be a little oily and sooty.

I am wondering if there is an issue with the reeds or card on cyl 3.

seems to run very nicley and revs freely with no lag or lumpyness.

Any Ideas??

ENGINE= Mariner 75 ELPTO 1991 2 stroke 3 carb.
You say it runs fine and revs ok, if it works i wouldnt be worrying about what the plugs look like. Its a 20 year old 2 stroke!!
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Old 05 March 2012, 07:35   #16
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Clamshell.....

Probablty a Q for Uncle Al or Turbo-D, but did the "needs a bigger jet in the top carb" thing carry through to the 3 carb versions? I believe the 50/60 Clamshells were prone to running a bit leaner in the top cyl?
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Old 05 March 2012, 09:54   #17
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9D280 The 75s dont need a bigger main jet in the top carb,that was only the 50/60hp clamshells cos they ran lean goodbye piston and if unlucky bore
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Old 05 March 2012, 10:28   #18
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I know!

I just wondered if the other clamshells suffered too, based on the top plug here......
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Old 05 March 2012, 11:18   #19
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NO just the damned 50/60s but once all the mods have been done i hate to say it they are not a bad obm, But still dont like them
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Old 06 March 2012, 04:30   #20
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They have been, and yes, the "no fitting does one job" thing is a PITA for servicing, but at 60Hp / 83KG I am not going to complain!

I guess we should stop hyjacking Jezza's thread........
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