35hp evinrude lark question.

[lukec]

Hello this is my first post, been lurking for a while trying to find a solution. This forum is awesome btw! Anyway I just bought an old 35 hp Lark. 50's-60's model. It starts great first time always. Idles, doesn't cut out and doesn't cut out if I throttle up but, it runs rough. Like ka-chunk ka-chunk ka-chunk. When I throttle all the way up it will run good for a second then ka-chunk again. I don't know if these are related symptoms but, fuel leaks out into the water I'm guessing through the exhaust and it has a hell of a time going into reverse. I'll start to work on it this weekend. Any advice where to start?
*sorry about not knowing the specific year. Any help is greatly appreciated.
-luke

 

[coolguy147]

Re: 35hp evinrude lark question.

check compression in the good ole motor. then check spark. after if all is good move on to a nice carb rebuiild with a new float. a new fuel pump diafram might be nice to start off. also please after checking spark and compression first thing is to makes ure u have replaced the water impeller recently

 

[BIGcarpy50]

Re: 35hp evinrude lark question.

I have heard that these motors are the most in-effecient(spelling) motors ever built...about 1/3 of the fuel just ends up in the exhaust...but still take a look at the comp and the WP....

 

[Chinewalker]

Re: 35hp evinrude lark question.

The ka-chunking sounds like a bad clutch dog in the lower unit. Time to get a manual. Lots of posts here on the forums on the subject, too...
- Scott

 

[coolguy147]

Re: 35hp evinrude lark question.

i didnt know what ka chunk meant lol.


is there problem of it jumping out of gear? could be as simple as a bad adjustment or loose shift rod


is there a problem with it running or coming out of gear or maybe a sound coming form the gear case?

 

[lukec]

Re: 35hp evinrude lark question.

Thanks for the replies!
@ coolguy- no irregular gear sounds and it stays in gear fine. The shift rod does seem loose but it goes into forward /neutral just fine. To get in and out of reverse it takes more than usual force.

@ chinewalker- the ka-chunk sound is more like the sound a big block motor makes with a hot cam. like its barely turning over.

A few more things I forgot to add. The boat and engine have been sitting for about six months. There was about 1/4 of fuel mix still in gas tank I added and more fuel mix on top. Also my Dad messed with the high/low speed adjustment (Thinking it was the choke, before we actually put it into the water). The carb was rebuilt in the past year.

The motor calls for 1qt oil for every six gallons of fuel. I'm using marine oil and regular grade gas. should I use premium?

learning a lot from other post. Will start working on it tomorrow afternoon
-luke

 

[Chinewalker]

Re: 35hp evinrude lark question.

Regular gas is fine - premium is a waste of money in a low compression ratio outboard.

Without hearing the ka-chunk myself, I really can't say what it could be at this point...

- Scott

 

[Willyclay]

Re: 35hp evinrude lark question.

Good luck with that great old motor!

 

[lukec]

Re: 35hp evinrude lark question.

Yeah "ka-chunk" is vague..It's not a metal to metal sound but a engine firing sound. My dad says it doesn't sound all that bad it's just running rough. I picked up a couple of plugs today. Hopefully I can find parts locally if I need them. Thanks for all the advice! I'll update over the weekend. First a plug swap and take a look at shift rod.

 

[coolguy147]

Re: 35hp evinrude lark question.

a video might help for us on ur problem?

 

[tmcalavy]

Re: 35hp evinrude lark question.

Read the top secret file at the top of this forum. Check compression, check for spark, check plugs and plug wires, dump that old fuel and use fresh...carb may need to be cleaned. Post the model number on the metal plate on top of the transom clamp so we know for sure which motor you are dealing with.

 

[lindy46]

Re: 35hp evinrude lark question.

Does it use a 2-line pressure tank or a single line tank? If it uses a 2-line tank it is more than likely a 1957. If it is a single line, it is a 1958 or 1959.

 

[lukec]

Re: 35hp evinrude lark question.

OK serial# - 35515-02368. changed plugs, one plug was coming apart HA! If it would quit raining I'm going to take it down to the lake to get the video of it running.

@lindy46 single line I think? I don't think it is a pressurized tank

 

[lindy46]

Re: 35hp evinrude lark question.

OK serial# - 35515-02368. changed plugs, one plug was coming apart HA! If it would quit raining I'm going to take it down to the lake to get the video of it running.

@lindy46 single line I think? I don't think it is a pressurized tank

1958 - should use a single line tank and fuel pump.

 

[TLanglitz]

Re: 35hp evinrude lark question.

Thanks for the replies!

A few more things I forgot to add. The boat and engine have been sitting for about six months. There was about 1/4 of fuel mix still in gas tank I added and more fuel mix on top. Also my Dad messed with the high/low speed adjustment (Thinking it was the choke, before we actually put it into the water). The carb was rebuilt in the past year.



There are folks on here far more experienced than me, but I think I'd try the obvious first. Old bad gas mixed with new gas can still be bad gas. I'd get rid of the old fuel, mix up somefresh fuel, reset the adjustments on the carb to default settings, and start from there. That carb has a float bowl which may hold bad fuel too, so you'd have to empty that, or just hope it burns up by running the motor. If I'm wrong, I'm sure someone will say so. <G>

 

[lukec]

Re: 35hp evinrude lark question.

Well ok, I took the engine to a mechanic. He was happy to see the engine, says he likes working on those old engines. They also told me to look on "iboat" forums for advice and parts. I think my repair attempts would of just done more harm. These forums are helping me tremendously understand what the engine I have and marine engines period. -luke *oh yeah, I'll let you all know what the "ka-chunk" sound was when I hear back from the mechanic

 

[guitarmanhoffy]

Re: 35hp evinrude lark question.

Can anyone help walk me through on how to replace a clutch dog in a 1957 35hp evinrude lark? keeps poping out of gear and when I spoke with an outboard machanic, he's almost sure that's what the problem is. Just wanna get to know this motor a little better, save some jack, and get this done myself. Any info on this would be great! Thanks

 

[tmcalavy]

Re: 35hp evinrude lark question.

guitarmanhoffy: you're hijacking someone else's thread...please start a new thread. You need a manual or parts diagram for your Lark, it'll show you how everything goes in the gearcase. Changing the clutch dog isn't hard to do, just takes some patience. Check the Links page at www.aomci.org for a parts source.

 

[guitarmanhoffy]

Re: 35hp evinrude lark question.

Yeah. sorry bout that. Realized after i did that I kinda goofed up. But thanks for the info

 

[Ron Herr]

Re: 35hp evinrude lark question.

it would be great to get any info on the 35hp lark. Just found out mine is a 35516 (1959) I have ordered a Seloc manual. From all the posts that i have read, I see that I need to repl my coils. Thanks in advance albanypainting@comcast.net