1957 Evin 18 hp throttle problems

[btaylor507]

I took my 1957 18 hp fastwin out today for the first time. I am unable to run this at full throttle. It felt like something was jammed. So I took the engine cowl off to check to see what was hitting. I noticed the bracket to keep you from revving it in neutral was just barley hitting some throttle plate and holding it back. After about a hour of frustration I just took the braket off. For now I am very careful about reving it in neutral, but still it hits the flywheel braket now and still will not let me "open her up". I can see it is obviously hitting the bracket and holding it back.

So is there a chance that when the previous owners changed the points, condensers, ect. they didn't put this back together right? I know its hard to diagnose with no pics but just wondering if anyone has had the same problem. This motor runs great and really want to see what she can do. Also it looks like it leaves alot of oil/gas on the water. Don't know if this is a problem either. You guys on this forum are my heros! Thanks for all the great info

If you need pics I will be down at the Marina tomorrow

 

[tmcalavy]

Re: 1957 Evin 18 hp throttle problems

Yep it could be out of clearance due to previous owners attempts at service, maintenance.

 

[samo_ott]

Re: 1957 Evin 18 hp throttle problems

Sounds weird. Something is out of whack there. Pics would really help.

 

[jbjennings]

Re: 1957 Evin 18 hp throttle problems

That DOES sound weird. You need that thottle stop bracket on your motor!
Question: Is the spring behind the throttle stop lever missing? I'm speaking of the lever that has the 3 slots in it that the shift lever sits in and it swivels on that bolt that goes through the side of the crankcase. It should have a spring behind it at the top to keep it pushed out. If it's not pushed out away from the powerhead, the armature plate might hit it on the way around. Other than that, without a pic I have no idea.
JBJ

 

[jbjennings]

Re: 1957 Evin 18 hp throttle problems

Now I'm really confused! I reread your post and don't understand how you could have taken off the stop bracket and still had an anchor point for the armature advance lever. I attached a pic to show you what I didn't understand.
Later,
JBJ

 

[btaylor507]

Re: 1957 Evin 18 hp throttle problems

Thanks guys, I have put everything back together. Seems the spring wasn't pushing the lever all the way out. But I did figure out that my trottle adjustments were off. It seem to be running @ full rpms now but I want to be sure I adjusted them right. I really had nothing to go by but the sound of the motor. Is there a better way to do this? I seem to be fouling plugs alot. I have gone through 4 sets in 2 days trying to get this running right. I really appreciate all the help. Thanks

 

[btaylor507]

Re: 1957 Evin 18 hp throttle problems

Sorry, by throttle adustments I mean high and Low carb ajustments, really don't know if thats right either,thanks

 

[btaylor507]

Re: 1957 Evin 18 hp throttle problems

One more thing, my fuel mix is 1 Quart tc3w to every 6 gallons.

 

[F_R]

Re: 1957 Evin 18 hp throttle problems

Fuel mix is correct.

There's no mystery about setting carb mixture needles. With the motor running at wide open throttle ON A BOAT, turn the lower, high speed knob to the right till it starts to falter then back it off to the left till it resumes full power. Too far left will make it "four-cycle", fire on every other stroke, and smoke and dump oil.

Then slow down to idle speed and do the same with the upper, slow speed knob. When you get that one too far to the right it will usually cough or sneeze. Back it off till it quits sneezing.

Now quit messing with them. If you are still fouling plugs, you may have weak ignition.

 

[btaylor507]

Re: 1957 Evin 18 hp throttle problems

Thanks FR, I'm heading down to the marina to try it out.

 

[btaylor507]

Re: 1957 Evin 18 hp throttle problems

Just got back.. Everything went well. Engine is idoling fine and the top end is good but my wake seems larger than normal and for the rpms. I should be going faster. My wake is higher than the rear of my boat and not very long. Theres alot of water being pushed, but I think its not adjusted to the transom right. I think maybe its shooting the water downward more than it should. Dose anyone know the correct angle. Once again I know its hard to judge with no pics but the motor is as close to the transom as it can get. Any info would be greatly appreciated. Thanks again guys.

 

[btaylor507]

Re: 1957 Evin 18 hp throttle problems

My boat is a 1960 Empire 14' Fiberglass V-hull ...see pic below

 

[wbeaton]

Re: 1957 Evin 18 hp throttle problems

As for the angle, its all trial and error. Start with the motor in the bottom trim hole and then run it up to WOT. Then try the next hole. Keep going until you find the best setting. You can also experiment with engine height. It can be a long process, but the most important thing to remember is that its just an 18 hp on a 14' fibreglass runabout. You aren't going to set any speed records. What is the max hp rating for the boat?

 

[jbjennings]

Re: 1957 Evin 18 hp throttle problems

Nice looking boat....
It would look awesome with a '56 johnson 30hp!
Glad to hear you got the fastwin running good.
Later,
JBJ

 

[btaylor507]

Re: 1957 Evin 18 hp throttle problems

My boat is rated for max 30 HP. I remember last year I had a loaner from my boss that was a 18hp Tahatsu and the speed on the gps was 23 mph. Now its only going about 7. So I guess its time for trial & terror I'll keep you guys posted. Thanks a bunch!

 

[wbeaton]

Re: 1957 Evin 18 hp throttle problems

Double check the ignition. 7 mph isn't right. The Tohatsu would be faster, but not that much faster. Check the coils and spark. Have you tried adjusting the carb? Is the throttle linkage in sync?