evinrude 40 hp was runnin perfect

[markwln]

So my great purchase just made me look bad, Its an older model do have the model numbers . But today I take out the boat and and fire up the motor, let it warm up me and my cousin shoot over to the spot and I turn off motor. Go fig dont catch nothin start motor, ( startsperfect) go to leave giving it throttle and it wont get up on plane. motor is working but Iwould say only half throttle. Does anyone have any Ideas? I pulled the plugs one seemed wet , I did notice some oil around the sparrk plug hole? Any help would be Great thank everyone

 

[Silvertip]

Re: evinrude 40 hp was runnin perfect

If one plug is wet that means it was likely not firing. The problem may be simply that the plugs need to be changed. It may also be that cylinder has lost spark. It may also be that there is a carburetion problem on that cylinder. But check for spark first. Replace the plugs and see what happens.

 

[1946Zephyr]

Re: evinrude 40 hp was runnin perfect

That could be caused from a number of things. First, try the other plug and see if it fires, if not, you'll have to check everything throughout the ignition system. Check and make sure the points are clean and gapped at .020. If it still doesn't deliver spark at that point, then it's likely your condensor gone bad or coil. Check and make sure the coils are not cracked.

 

[markwln]

Re: evinrude 40 hp was runnin perfect

Can I see if the coils are cracked without taking anything off? I dont think they are. I will try the plugs . Thanks for the help.

 

[bktheking]

Re: evinrude 40 hp was runnin perfect

Can I see if the coils are cracked without taking anything off? I dont think they are. I will try the plugs . Thanks for the help.

My little blip of a manual on this motor says early motors had an inspection port through the flywheel to adjust points, later motors the flywheel had to be pulled. Even with the inspection hole it's still hard to see all of the coil. Pull the flywheel. Is this a big twin or lark?

 

[lindy46]

Re: evinrude 40 hp was runnin perfect

You don't say what year the motor is, but if it's a '60s motor with points, coils, condensers, it sound like you're only running on one cylinder due to a bad coil. Motor will idle fine on one cylinder, but when you hit the gas, it won't run so good.

 

[tashasdaddy]

Re: evinrude 40 hp was runnin perfect

OK if you want the correct help, provide the id info on the motor. too many differences it the motors over the years. http://forums.iboats.com/showthread.php?t=250879

 

[markwln]

Re: evinrude 40 hp was runnin perfect

Hey Guys , The model num is 40655A year is a 78. Thanks just going to get new plugs tonight. Hope this is all u need. Thanks for the help. Do u think that a coil could go that quick? I guesse u can never tell if is going because she was running good. I know she is a girl thou because she is stubborn as a mule.

 

[steelespike]

Re: evinrude 40 hp was runnin perfect

Those coils are the weak point fortunately a fairly easy fix and coils are available right here.Check the coils, any cracks or discoloration replace.
Check the wires for wear from rubbing or age.Wire should be available here.