1955 Evinrude 25hp Bogging

[Vapour1ze]

So over the past few days I've worked on getting this going, finally I'm here I'm gonna keep it short.

I cleaned the carb, replaced plugs, checked spark, checked compression, replaces gas lines and gas,.

Started motor ran good, idles and would wind out real nice,

Now the motor starts first pull everytime and when I put it in gear and hit the throttle it bogs, and won't open up at all. See the video.

Pulled the plugs and they're wet, the float in the carb when I pulled it apart did look pretty bad but floated ok it seemed, I don't know if it should be replaced and is causing this or what. I have no idea at all. Hopefully the video will help you see.

http://www.youtube.com/watch?v=ymrOVmxT2sA&feature=youtube_gdata

 

[JimS123]

Re: 1955 Evinrude 25hp Bogging

I'd look at the gas tank first. Check to be sure all the gaskets and seals are OK. Replace the 2 o-rings in the fuel line connector.

I rebuilt my tank with all new rubber parts. To save wear and tear on the gas cap gasket I try to barely tighten it. At times I get a little bogging as well, but as soon as I tighten the cap just a bit, the motor clears right up.

 

[Vapour1ze]

Re: 1955 Evinrude 25hp Bogging

but the plugs are wet? so wouldn't it be getting to much gas? it fires and I can rev it somewhat on the inital cold start, but after i warm it up and kill the motor and start it up again nothing.

 

[54fleetwin]

Re: 1955 Evinrude 25hp Bogging

sounds to me like it is only running on one cylinder.
Did you replace the coils?

 

[bktheking]

Re: 1955 Evinrude 25hp Bogging

Defintely cutting on one cylinder, you can hear it plain as day. When you had the carb apart, did you remember to install the boss gasket?

 

[lindy46]

Re: 1955 Evinrude 25hp Bogging

Check spark, make sure it's firing on both cylinders. Also, try raising the gas tank. Pressure from the motor must push the gas out of the tank to the carb. I've found the old pressure motors may not run good if the tank is too low. On a boat, the tank is much closer to the level of the carb than where you have it.

 

[steelespike]

Re: 1955 Evinrude 25hp Bogging

You could be losing one cylinder from severe flooding.Unhook the gas line see if it straightens out as the carb empties.Be sure the jets are set on the preliminary settings.

 

[Vapour1ze]

Re: 1955 Evinrude 25hp Bogging

i have spark on both cylinders, yes, so wouldnt that mean the coils are good? I will try raising the gas tank today , and I will also try running without the gas line to see if I can wind it out before the carb empties out

 

[Vapour1ze]

Re: 1955 Evinrude 25hp Bogging

gas tank didnt help, but if both plugs are sparking decently the coils are good right and if the plugs are wet its obviously getting gas just flooding out, would the float maybe be sticking?

 

[54fleetwin]

Re: 1955 Evinrude 25hp Bogging

yes the float could be sticking

 

[lindy46]

Re: 1955 Evinrude 25hp Bogging

Normally if float is sticking, you'll see gas running out the carb. Is that the case? If not, and you're saying plugs are wet, then I'd suspect poor spark. How did you test spark? With a spark tester or just by grounding plugs against block? Did you take a look at the coils and points?

 

[Vapour1ze]

Re: 1955 Evinrude 25hp Bogging

yea im just checking by groudning against the block itself, and it looks ok to me, how do i check the coils where do I find them?

also where can I get parts for this

 

[Vapour1ze]

Re: 1955 Evinrude 25hp Bogging

ok, just ran the motor hooked up the gas line, started it, it was bogging like normal, then I unhooked the gasline, and it would start coming back to life then boom wide open, for about 2 seconds and it would die. so its obviously flooding out correct? which would narrow it down to the float sticking correct?

 

[bktheking]

Re: 1955 Evinrude 25hp Bogging

Replace the float with the new style if it's the old style cork , the varnish gets eaten away and then they become saturated to the point where they will stop floating.

 

[kbait]

Re: 1955 Evinrude 25hp Bogging

Sinking float, float valve stuck open, leaking-missing nozzle gasket ('boss' gasket between carb body and bowl).

 

[Vapour1ze]

Re: 1955 Evinrude 25hp Bogging

Can I check the gasket or should I just replace it that would cause what is happening ? Or should I just replace the float I found one for 11 bucks but I have to order it

 

[lindy46]

Re: 1955 Evinrude 25hp Bogging

If you don't take a methodical approach to troubleshooting, you'll never figure out what's wrong.
1. Check compression. If you don't have good and consistent compression, the motor will never run right. Minimum 75-80psi and both cylinders within 10% of each other.
2. Check spark with a spark tester, available at any auto parts store for about $8. Spark should jump a 3/8" gap with a snappy blue spark.
3. If spark is poor, then you'll have to check the points, condensers and coils, which are under the flywheel. You'll need a harmonic balance puller to get the flywheel off. Points must be clean and not pitted/burned. Set points to .020" at their widest point on the cam. Coils should not be cracked or deteriorated. You'll need a torque wrench to properly re-torque the flywheel nut when done under there. Proper torque is 40-45ft.lbs.
4. If compression and spark are good, then clean and rebuild the carb. About $30 for a carb kit and float. Replace the fuel lines.
5. Make sure the tank is clean, rust-free and holding pressure.

 

[Vapour1ze]

Re: 1955 Evinrude 25hp Bogging

Where's the best place to order parts for this motor since it's a 55 I can't find many websites

 

[FHB]

Re: 1955 Evinrude 25hp Bogging

It is cheap enough to just change coils, plugs, wires, condensors just to get it out of the equation. You will need to remove the coils to change the ignition wires.The stuff is likely ancient anyhow.Lindy is giving you good advice. Get the spark tester. The spark needs to jump at least 1/8 inch for it to mean anything.

Rebuilding the carb takes 1 hr and a $25 rebuid kit.Instructions are in the kit.No float is provided. If the float works properly you should be able to blow air into the fuel line with the carb up right, but not up side down.

Carb and magneto may be fine, but it may have poor timing adjustment. You have to do an synchronization procedure. The armature on the throttle adjustment must be connected to the magneto and move it as the throttle opens.The notch on the flywheel has to aline with the key on the crankshaft.

There is good information on this in the "top secret file". Buying a manual is really worth the money.I have the Clymer manual. I got all my parts from
Laing boats. The iboat site also sells antique parts.

I am new at this. There are alot of knowledgeable and kind people here who talked me through all this.

Have fun.

Frank

PS. I think your motor looks cool.

 

[Vapour1ze]

Re: 1955 Evinrude 25hp Bogging

haha thanks, it does look pretty awesome ha, I guess its just process of elimination now.