newby/76 evinrude 25 hp not running right.

[PW2]

Re: newby/76 evinrude 25 hp not running right.

The link worked for me.

May I ask what function that starter rope section performs that is tied to the choke?

It might be a touch unrealistic to expect it to run like new while original parts are missing/bypassed/jerry-rigged.

Most of the parts on these things were engineered to be there for proper functiong-rarely are they put on for decoration.

 

[freddyray21]

Re: newby/76 evinrude 25 hp not running right.

I would deal with the coil floating around first. If it's floating around that cylinder is likely missing. Missing causes bad idle poor performance at wot ect.

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

the motor used to have a big deal of a electric choke. that stuff has been gone for a LONG time and has been replaced by a string to pull to choke it. it works perfect and bares no effect on the things performance. also its been running tip top perfect for many years with that setup.


is the oil on the motor a problem? is that a sign of having been too rich for a while or a crank seal out, anything?

 

[iwombat]

Re: newby/76 evinrude 25 hp not running right.

I didn't realize we still had a floating coil issue. You really have to make that solid first. You cold have a flakey ground on the coil.

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

replacing the coil tommorow friday. also replacing fuel recirc line for giggles.

i think i did verify that its leaking around the carb. sprayed carb cleaner around the gasket and it bogged it down like it would have if i sprayed it in the throat.

i took it out today and after the last carb rebuilt it isnt bogging out when its up on plane.

 

[iwombat]

Re: newby/76 evinrude 25 hp not running right.

Well then, you've got a warped carb body. Here's how you fix it.

You'll need some flat steel or aluminum stock and a good bench vice.

Place the carb in the vice with the flat stock against either end. Put a flat washer behind the flanges as a spacer so the front of the flange is not touching the flat stock. Close the vice until snug, then go another 1/4 turn. Heat the body up a little bit with a hair dryer or portable heater or the like. After about 2 hours or so give it another 1/4 turn and heat again. You'll keep doing this procedure over the course of a day. Be careful not to put too much of a load on the carb body. You want to warp it a little bit back the other way but not too much.

After you remove the carb, plane the flange flat with some sandpaper placed on a piece of glass.

I've done this on a bunch of different types of carbs and it works most of the time. Furtunately, outboard carbs don't have any slides and the like bind up so it's a lot easier.

 

[F_R]

Re: newby/76 evinrude 25 hp not running right.

I've gotten lost in this long thread, but I don't see where you have dealt with the needle bushing. It is in there, you just can't see it. A homemade wire hook, or your wife's crochet hook, or some people use a drywall screw, will get it out.

If it is leaking around the bushing, it will suck air into the idle circuit. Likewise, if somebody left it out.

All that greasy, oily slop means something too. I'd guess a crankcase leak or main bearing seal leak. Again, if oil is slopping out, air is leaking in. OR, somebody has been keeping it hosed down with WD-40 in an effort to prevent salt-water corrosion.

Finally, I don't see any mention of the fuel pump except for the pressure which is OK. But that doesn't mean there isn't a pin hole through the diaphragm, which will inject extra fuel into the crankcase. Unbolt it from the mounting and squeeze the primer bulb. If gas squirts out the back, you have a holed diaphragm.

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

i went to a great local boat shop here that got me some parts for cheaper than i found online, sweet.

not sweet is i replaced the coil today and it seemed to idle a little happier, but still nothing that would hold even with s/s needle adjust. while at the shop i got a fuel pump rebuild kit and threw it in after the coil test. still no great results but the pump certainly needed rebuilt. it had been there for a very long time and had a nice deposit of gunk and a lil pile of rust.

the shop i got the parts at is owned and run by a super nice guy that is more than helpful. he's been giving me idea's/great prices and things to check. he's also done some work on my buddies boat for nothing. nice guy.

i also checked the mounting surface of the carb. it seems perfectly flat. i checked it against a glass pane, nice and flat.. for giggles i doubled up the gasket on the carb and tightened it so i dont think it will be leaking again. the guy at the boat shop said he would get me a new carb for it though, i think for free/very cheap.

so after that its still not good.

guy thinks the seal is blown out of the top giving me the oil all over the motor. if i dont find the prob soon i'll end up with the whole thing rebuilt! i might take it to the shop tommorow for the guy to look at, i really dont know what else it could be. meh.


SO just to check, if all is good at a happy idle it can basicly have the butterly closed/let it spring back fully and still run thanks to the slow speed orifice ,fuel ports and the little cutout on the butterly right? so there would be no idle adjustment other than the slow speed needle?

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

i did put a needle bushing in. i am 95% sure there was not one in it the carb previously.

i pushed it in all the way, should i have just let the needle push the bushing in as far as it wanted?

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

after looking around on the interweb, im thinking the crank seal might be my prob. might try to test with carb cleaner tommorow and maybe replace.

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

so i might just have this fixed. tommorows testing will tell. thanks to the guy/paul at the boat shop. the top oil seal was certainly shot and he wanted to test the compression since he said a bad seal can ruin the top cyl. i was happy to see that both top and bottom cyl are upwards of 130 psi. we yanked the top off and got to the seal and dug it out. he gave me some pointers and i went on my way home with a new seal and i also got a new "tune up kit" with new points and condensers, id rather do it while i im in there ya know, plus one breaker wasnt hitting flush and was worn funny and the other condenser wire had the insulation knocked off. that might have been grounding out and causing some probs.

anyways i'll have it back together tommorow. i really hope its happy.

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

Its fixed! the new crank seal, new points/condensers and re-wired the hack job wiring that was on it. i'll need to fix one of the breakers as its not hitting flush but it still ran almost perfect. its a nice change from before.

i also put in a kill switch which is nice.

thanks for all the help.

 

[texasbowhunter40]

Re: newby/76 evinrude 25 hp not running right.

I have the same motor and here is a link to a bunch of pictures.

http://76evinrude.shutterfly.com/

mine has been sitting for a few years and i have already started another thread about my whole 76 Evinrude 25hp delima
http://forums.iboats.com/showthread.php?t=320194