1961 Evinrude Lark 3 40hp. Problems

[waterlogged59]

After all this hard work and Sweat and Tears the boat is finally done. You ahve seen the pictures of the finished work.. Just my luck the motor is messed up again!!! Why is it that when you get soo close to being done the Boat Gods do this to you!!! Well before I took the boat apart the motor was running great doing 29 to 30 with 2 people. Now with the motor back on it wants to cut out. Not sure why That is why I am asking. I checked the float bowl and the carb and nothing is wrong. also Checked the wiring and seems fine. changed the spark plugs. fine.. Also checked the gas lines they seem fine. It will fire up but putter.. and when i give it gas it wants to bog down. I will sit there and play with the rich and lean and that doesnt seem to do anything unless i go real lean and it will cut out.. what i dont understand is that the motor just sat there during the painting process and nothing happened to it. so what changed???? HELP!!!

Here is the link to the boat..
http://forums.iboats.com/showthread.php?t=250569

 

[Evinrude Boater]

Re: 1961 Evinrude Lark 3 40hp. Problems

You think you've got problems. After my five year restoration project was complete my engine seized the day I took it out of the water for the season. My V-4 had the same problem running and I found a piece of crud in one of the high speed jets. It would start and idle fine but give it throttle and it didn't get enough gas to mix with the air that was coming in. To make matters worse, one bank of the V-4 was running properly and the other wasn't due to a 2 barrel carb with one barrel plugged.

 

[freddyray21]

Re: 1961 Evinrude Lark 3 40hp. Problems

check to see if the points got dirty and glazed over. could just be something simple.

 

[fuzzeywiggler]

Re: 1961 Evinrude Lark 3 40hp. Problems

Might have and issue with the fuel pump, an easy test is to pump the primer ball while giving it throttle if it doesn't bog down great you've found part of the problem.

Good luck Great work BTW

Fuzzy

 

[Bear 45/70]

Re: 1961 Evinrude Lark 3 40hp. Problems

How old is the fuel? It goes bad real fast anymore. I've seen bad fuel at 3 months in a guys tank. Always store gas with a fuel stabilizer in it.

 

[waterlogged59]

Re: 1961 Evinrude Lark 3 40hp. Problems

Another question... When I took the motor off the boat to store I built a Motor Mount on wheels. Well during the night it broke and the motor flip and fell on it top. Good thing the Hood was still on. It was upside down for at least 8 hours. So my question is this.. Would the oil and gas drain downward towards the points causing them to be some what obstructed. Meaning it will fire but still cause it to malfunction. I have checked the lines and nothing seems to be messed up. The oil/gas is good. not old. Also.. Is there a way to pull the flywheel without having the puller. I had to borrow a friends a few months ago but he wont be back in town until december.

 

[Bear 45/70]

Re: 1961 Evinrude Lark 3 40hp. Problems

Yes there is another way to pull the flywheel but you take a chance in breaking the crank and/or the flywheel. Buy a small puller at the local Harbor Freight, Sears, discount store or car parts store. It's worth the investment.

 

[waterlogged59]

Re: 1961 Evinrude Lark 3 40hp. Problems

With my previous post I stated about the points and the motor falling.. Can this be the issue.. That the points have oil from being upside down..

 

[Evinrude Boater]

Re: 1961 Evinrude Lark 3 40hp. Problems

Oil and gas shouldn't leak out of the crankcase when the motor was inverted. There wouldn't be enough fuel sitting in the crankcase to run out and the crank seal should keep it in. I doubt it would get to the points since they're off to the side of the crank shaft. Any leaking would just puddle in the flywheel. If the top seal is leaking, you've got another problem.

 

[waterlogged59]

Re: 1961 Evinrude Lark 3 40hp. Problems

I need to get some information on what prop would be good for my motor. I have spun 2 props that were original from my 1961 40HP lark 3 evinrude. I need to replace one but do not know what to buy please let me know!!!

 

[tx1961whaler]

Re: 1961 Evinrude Lark 3 40hp. Problems

You can get those props repaired easily. If you want a new one, there should be markings stamped on the prop that will tell you what pitch it is.

 

[waterlogged59]

Re: 1961 Evinrude Lark 3 40hp. Problems

Got A Huge Problem!!!!! I Need A Lower End For My 1961 Johnson 40hp. Can Anyone Help Me.... Please!!!!!

 

[coolguy147]

Re: 1961 Evinrude Lark 3 40hp. Problems

sheesh ur just coming up with problems.

calm down. sheesh


u can get the props rehubed. costs almost as much as a new prop maybe as much. id suggest a 10-12 or 10-11 i think for that motor dia- pitch i belive. the 35hp i worked on very similar to urs has a 10-12 and its very fast.

i get about 29-30 mphs also.

ok whats wrong with ur lower unit?

and the bogging down might be mean ur full pump. id take a loook at that first. just see if u can pump the primer bulb and if it makes a difference.


another idea would be if u didnt replace the float with newew types of floats. did u get a rebuild kit with a new float for ur carb?

 

[coolguy147]

Re: 1961 Evinrude Lark 3 40hp. Problems

also check compression in ur motor to make sure thats not a factor either


i was reading and just remembered another possible problem. u might be running on one cylinder. chekc spark and compression

 

[waterlogged59]

Re: 1961 Evinrude Lark 3 40hp. Problems

Thanks for the quick response but there is nothing wrong with the engine. just the lower unit. it keeps slipping out of forward and wont stay in. Also there is a huge crack in the lower part. so there has been no lower unit oil for a long time in there. so possibly bad gears. also. I was going to try and take it apart myself and look at the gears but some of the bolts have lost their heads so i cant take them out!!!!!!

 

[tmcalavy]

Re: 1961 Evinrude Lark 3 40hp. Problems

Slipping or banging out of gear, usually at higher rpms, means the clutch dog is shot. It is the piece/gear that engages forward and reverse. You have to pull the LU and get into the gearcase to check/replace it. No way around that, short of just buying another LU...which may have the same problem. If the LU is cracked, you're gonna have to pull the LU anyway. Never dealt with your problem of bolts with broken heads...someone who has will come along soon with an answer.
Note: I followed your link to your boat resto post and posted some comments in that thread, too. Don't give up, you're very close to having it in A-1 lake trim. All you need is a LU...shouldn't be too hard to find. They made a million of those 40 hp big twins and most are still lying around waiting to be found.

 

[waterlogged59]

Re: 1961 Evinrude Lark 3 40hp. Problems

I got another question. I found a marine shop close by and he has a Envinrude 35hp around the same year. My question is this. Is the 35hp have the same lower unit as the 40hp i have. I have the manuel and it shows how to tear down a lower unit from 25-40hp. The guy told me he would give the whole motor to me for 200 but i just need the lower end. i did not get it because i dont know if it is the same fit. is the gear ratio the same for both.

 

[F_R]

Re: 1961 Evinrude Lark 3 40hp. Problems

I got another question. I found a marine shop close by and he has a Envinrude 35hp around the same year. My question is this. Is the 35hp have the same lower unit as the 40hp i have. I have the manuel and it shows how to tear down a lower unit from 25-40hp. The guy told me he would give the whole motor to me for 200 but i just need the lower end. i did not get it because i dont know if it is the same fit. is the gear ratio the same for both.

The 35hp was made in two styles. If it is the "Super Quiet" version it will fit. The standard version will not. FYI, your 40 is an example of a Super Quiet..note the double walled midsection.

 

[waterlogged59]

Re: 1961 Evinrude Lark 3 40hp. Problems

so i am going to have to pull the lower end tomorrow on the other one. would it be better to just take the lower end and my boat to the guy tomorrow so if it is the right one we can put it on and test it there to make sure the lower end it good. he wasnt sure.

 

[coolguy147]

Re: 1961 Evinrude Lark 3 40hp. Problems

just a thought to prevent further problems. when buying a lower unit. before u install it in ur motor make sure that it has an impeller and most likely recommended to replace it. sicne it may have any old one