1973evivenrude 25 hp

S

soonerman

Recruit
Joined
May 11, 2009
Messages
1
my 73 evinrude,been overhalled, works good,but when going across water
about every 6 seconds it makes a frump or thump sound, it dont cut out
or rev up. the hub in prop is not turning. other than this noise it works good.
any ideas? LOWER UNIT SOLID
 
Last edited:
Vic.S

Vic.S

Rear Admiral
Joined
May 4, 2004
Messages
4,721
Re: 1973evivenrude 25 hp

Presumably not a meatllic knock.

A misfire perhaps. Check/clean/reset preferably replace plugs. (J4C gapped 0.030") Check plug leads. Its an old points ignition system so check/clean/reset/replace breakers. Also inspect coils.

A "lean sneeze" perhaps. Maybe carb is in need of a clean.

Easiest/ cheapest things first. difficult/expensive things last.
 
lindy46

lindy46

Captain
Joined
Nov 27, 2008
Messages
3,886
Re: 1973evivenrude 25 hp

If it feels like you're hitting a log, it's a bad clutch dog/forward gear. Does it do this a low speed? You say, "lower unit solid" - have you had it apart and inspected the gears and dog?
 
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