How to checkout a used O/B?

mscott

Cadet
Joined
Oct 14, 2004
Messages
10
I just bought my first boat (16' Vanguard), but it came without a motor.<br />I've found a used 1993 Johnson 70HP w/controls at a price I can afford. I'm told it runs great, but I'm new to boating.... Running great with the water flush ears on may not be a good enough indication.<br />I'm soliciting advice. Is there a website of tech specs for this year OB? What is the compression of this OB when new? What would be acceptable 11 years later? RPM range? Any seals worth checking? What about oil consistency?<br /><br />All advice is greatly appreciated!<br />-Mike
 

G DANE

Commander
Joined
Nov 24, 2001
Messages
2,476
Re: How to checkout a used O/B?

Its good to hear you are carefull buying outboards used.<br /><br />Best way to examine a used outboard is sea trial, including 10 - 20 min at WOT. Not having this possibility, combined with no warranty, usually lowers price considerably.<br /><br />I would:<br /><br />1: Check compression, which on a tripple looper like this, from new was 150 in all three, but on a good used, between 130 and 145, all three showing compression within 10 PSI. As gages can read different, advise is it should always be above 100, but thats low.<br /><br />2: check spark. At best get hold of a spark tester, and check that all the sparks can jump 7/16 gap when starter is crancking motor.<br /><br />3: Check lower unit oil. Remove lower unit drain plug and be sure oil is clear, not milky or water containing. I like to see a little dirty oil, then I know its not changed with this control as reason.<br /><br />Besides from that ?? Does it look used or abused. Wat this motor ever serviced ? Why is it for sale ?<br /><br />Be aware that 3 and 4 cylinders outboard can iddle on muffs, in a way that makes it very difficult to determine if all cylinders do their part of the common work.<br /><br />All that being said, the tripple looper is a very fine design, and a strong and economical motor.
 

mscott

Cadet
Joined
Oct 14, 2004
Messages
10
Re: How to checkout a used O/B?

Awesome reply G -thanks!<br />The good news is that the place selling this OB offers a 60-day warranty! The guy picks up outboards, dead or alive, and reconditions them.<br /><br />I'm still hoping to find a website with tech specs for these older babies. The original manual for this 70hp is long gone.
 
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