Oil leaks & Evinrude Lark

[jrw1295]

I have a 1958 Evinrude Lark 35 that runs quite well---but---when I dropped the motor down in my driveway, some heavy, very black sludge (grease-like) dripped out of the exhaust outlet. There was also some light oil I like motor oil)dripping from a small hole about a foot or so above the exhaust outlet.

Is this bad stuff or normal stuff. When I tip the motor back up, there is no more leaking. I haven't put it back down to see if the leaking continues.

 

[Paul Moir]

Re: Oil leaks & Evinrude Lark

That ought to be normal. You might want to check the l/u oil for signs of water intrusion but you should expect a little oil from those locations, especially if the engine was idled a lot before it was stopped, chocked, run dry, etc.
It's just unburnt oil found in the exhaust of a 2-stroke. It probably smells a bit like gasoline.
You might consider doing a decent decarbing of the engine. It's always a good idea on older motors with unknown histories.

 

[Paul Moir]

Re: Oil leaks & Evinrude Lark

Here's an excellent description:

Decarb FAQ

The Big Twins, especially run at 24:1 or with incorrect oil will carbon up fairly quickly in certain circumstances. It's always wise to do this when you first get an old motor as it will often free up a stuck ring, etc.

 

[jrw1295]

Re: Oil leaks & Evinrude Lark

Thanks for the quick reply and the helpful answer. What is the process for decarbing? Can I do this myself?d