Timing base in relation to throttling

[TXWings]

Looking for some knowledge on this motor. First time posting. Evinrude 18hp, #5032-02753, what year could this be? My problem is that throttle will only advance to the first stop when in neutral. If this is normal, I do not get enough rpm's to keep it idling(in neutral). When in forward, timing base seems to advance fully but I only have about 3/4 power/rpm's. When in reverse, it is at the half throttle stop. I have recently replaced a stripped bolt in the gear linkage. I checked my gearbox, re lubed the foot, and everything is adjusted fine. The problem has just arrived. Could it simply be a matter of adjusting the idle speed? Any leads on making this adjustment would be appreciated. I recently rebuilt the carb, have the drive train in sync, and now have this timing issue. I searched for similar problems, therefor, I hope this is a simple one. Thanks.

 

[OBJ]

Re: Timing base in relation to throttling

Welcome aboard iboats Mike.<br /><br />Year....Mike was that (1)5023? Or 5023? Can't fined 5023 but a 15023 comes out as a 1960 year.<br /><br />The thottle stop is normal in neutral. Keeps a person from over reving in neutral. Not a good thing.<br /><br />The idling issure sounds more of a carb adjustment than any thing. Set the high speed needle first (I think these engines still had a high speed needle) then idle down and set the low speed needle. A good place to start is about a turn and a half out on the low speed. Remember, run the low speed needle in GENTLY until you feel he seat, then back out. Once you have found the best idle in gear, back the needle out a little to prevent to lean a opertion.<br /><br />In back of the carb is the cam follower. This is a sticky up thing that rides against the cam under the flywheel. Look on the cam for a line or hash mark. When the cam follower is centered on the line, the throttle plates should just start to move in the open direction. Adjust till you get it there and the sync and link will be correct.<br /><br />Half throttle in reverse is normal.<br /><br />Keep us posted to your progress and if you have any problems. Thanks.

 

[TXWings]

Re: Timing base in relation to throttling

OBJ, thanks. There is a nylon set screw on my tiller handle that I may have adjusted the last time I tuned on it. I think it's an idle screw and not that crucial. I will try that in addition to the carb/needle settings, which you have referred to. Mainly, I wanted to make sure that the first stop was normal for neutral-you have confirmed that. In neutral, I have such a slow idle that it will barely keep running long enough to put it in gear, which then allows more throttle. I have just stumbled on this site and it's great.

 

[bubbakat]

Re: Timing base in relation to throttling

OBJ I think he dropped the 1 on the first of his number. I came up with the same year as you did.<br />15032 18 1960

 

[OBJ]

Re: Timing base in relation to throttling

Thanks bubba....<br /><br />Mike, if the low speed needle is adjusted correctly and the cam and cam follower are in sync, use that nylon screw to set the idle up a little. <br /><br />Keep us posted.

 

[Hooty]

Re: Timing base in relation to throttling

..."a stickey up thing"? <br /><br />c/6<br />Hooty

 

[OBJ]

Re: Timing base in relation to throttling

Welllllllll.....sometimes ya' gotta improvise Hooty.

 

[Hooty]

Re: Timing base in relation to throttling

I know the part you're talkin' about and here in Texas we call 'em "chingoso's" <br /><br />c/6<br />Hooty

 

[TXWings]

Re: Timing base in relation to throttling

Thanks for the help. I should have seen the 'one' before the number. I don't think the timing is off, as she ran like a champ a month ago before it was slipping out of gear. The only thing I've adjusted is the nylon idle screw. The slow idle takes a 7/16 and pair of vise grips. I bet I can get her running Fri or Sat. I like this site!

 

[TXWings]

Re: Timing base in relation to throttling

The carb adjustment fixed it. I get great top end power with the boat planing like it needs to. At idle, she still has a 'miss' which seems to be smoothed out by the slow idle being adjusted. I may play with the fast idle some more. The idle screw on the tiller mainly helps to kill the motor. I wonder if some silicon sprayed on the timing base would ease its advancement?? Thanks again for everyone's help.

 

[OBJ]

Re: Timing base in relation to throttling

Hi TX....that "miss" was probably a "lean spit" or "cough". You cured it with the idle screw adjustment.<br /><br />Be carefull what you spray under the flywheel. Getting something thats conductive under there may mess the points up. The correct way to fix the sticky problem is to remove the flywheel and remove the magneto plate. Clean all the old grease from it and apply new.<br /><br />Look for a link that connects the magneto base with the throttle tower shaft. Should be on the port side of the motor. Remove the clip and disconnect the link. Try the twist grip and see if the stiffness is in the grip and not the mag base.<br /><br />Keep us posted PW.<br /><br />Hooty....what the heck is a "ching whatchamacallit"?

 

[bubbakat]

Re: Timing base in relation to throttling

Hooty....what the heck is a "ching whatchamacallit<br /><br />OBJ you don't even wanna know that. its a wordy dird in spanish

 

[OBJ]

Re: Timing base in relation to throttling

OH...........OK.

 

[Hooty]

Re: Timing base in relation to throttling

Heh, heh, heh.<br />It's not really a "dirdy" word, just zounds like it but it covers a multitude of things and stuff. Perfectly good Texaneze word.<br /><br />c/6<br />Hooty

 

[OBJ]

Re: Timing base in relation to throttling

Sorta like when we say "OHCHIT"????

 

[TXWings]

Re: Timing base in relation to throttling

lean spit=miss=cough=not enough fuel at idle?? I will back off (a little more) on the fast idle. That slow idle knob (on the far right) only twists 360 degrees. I wonder if it should be in the middle when I set the fast or are they related? Still tunin'. Yeah, I'm struggling keeping up with some of your terminology.

 

[G DANE]

Re: Timing base in relation to throttling

TXwings<br /><br />This is the correct procedure of adjusting your carb, copyed from one of Joe Reeves as ususal great earlier posts. Hope you think its OK Joe. Be aware of: You will only get the best results on a clean carb, and motor must be on boat, boat moving in water: From Joe:<br /><br />I've included the proper method of adjusting your carburetor below, I suggest you print it out for future use.<br /><br />(Carburetor Adjustments - Two Adjustable N/Vs)<br /><br />Initial settings are: Bottom high speed = seat gently, then open 1 turn out. Top slow speed = seat gently, then open 1-1/2 turns. <br /><br />Setting the high and low needle valves properly: <br /><br />(High Speed) Start engine (it will run pretty rough), shift into forward gear, take up to full throttle. In segments of 1/8 turn, waiting for the engine to respond between turns, start turning in the bottom high speed needle valve. You'll reach a point whereas the engine will either start to die out or spit back (sounds like a mild backfire). At that point, back out the needle valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest setting. <br /><br />(Low Speed) Slow the engine down to where it just stays running. Shift into neutral. Again in segments of 1/8 turns, start to turn the top needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running. Eventually you'll hit the point where the engine wants to die out or it will spit back. Again, at that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting. <br /><br />When you have finished the above adjustments, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.<br /><br />--------------------<br />Joe (30+ Years With OMC)<br /><br />ReevesJ32@aol.com

 

[TXWings]

Re: Timing base in relation to throttling

Interesting. Thanks.