1976 evinrude 85 hp. here is where im at!!

[matt85evinrude]

It just wont start now. all it does is turn over. not even try to start. maybe its the fuel pump damaged?? have read in manual that back fires can damage the diaphrams inside the pump. when i spray fuel into the carbs from the front past the choke plates, turn it on, (choke plates close) turn her over and about to seconds in it backfires and thats it. any ideas guys? wierd thing was it was starting last week, but hard to start. this is what ive replaced on the engine. rebuit carbs. new spark plugs. new power pack. new rectifier. new water impellor. new leg oil. thats it. passes every electrical test aswell.

 

[boobie]

Re: 1976 evinrude 85 hp. here is where im at!!

Sounds like a sheared flywheel key.

 

[matt85evinrude]

Re: 1976 evinrude 85 hp. here is where im at!!

you mean all the teeth the starter motor engages?

 

[matt85evinrude]

Re: 1976 evinrude 85 hp. here is where im at!!

sorry i no what you mean now! is it a pain to replace?

 

[boobie]

Re: 1976 evinrude 85 hp. here is where im at!!

You'll have to pull the the flywheel to check it. It's the woodruff key that keeps the flywheel in proper time with the C/S.

 

[levi_tsk]

Re: 1976 evinrude 85 hp. here is where im at!!

um .. does this one have a primer silenoid? i know mine if its been sitting for awhile you have to open the valve on it and then squeeze the bulb till it fills everything up and then close the valve and then itll light right off .... otherwise it does as matt discribed and pops snorts and sneezes backfires till you do

 

[matt85evinrude]

Re: 1976 evinrude 85 hp. here is where im at!!

took the nut off the flywheel and can see the key sitting where it should be so cant be that! not sure about the primer solinoid levi. if i do have one where would it be?

 

[Fed]

Re: 1976 evinrude 85 hp. here is where im at!!

Make sure you re-torque that flywheel nut to spec matt.

 

[emdsapmgr]

Re: 1976 evinrude 85 hp. here is where im at!!

When it won't start, are the plugs wet or dry?

 

[mkay]

Re: 1976 evinrude 85 hp. here is where im at!!

If the plugs are wet the problem is spark, Pull a plug, reconnect the wire and rest the plug up against the block. If you get no spark on cranking the ignition system isn't working. The problem is probably in the CD charge or trigger circuits which are separate electrically from the battery charging alternator stator. Since you've replaced the stator which contains the ignition charge coils the problem is probably in the trigger system. The trigger system rests inside the stator pack surrounding the crankshaft and take it signals from magnets inside the hub of the flywheel. The gap between the magnets and the sensor coils are sometimes adjustable. Evinrude made an inexpensive gap gauge to set the correct gap. If compression is good these engines will start easily if they get fuel and spark. Good luck

 

[emdsapmgr]

Re: 1976 evinrude 85 hp. here is where im at!!

The choke solenoid on that engine is the old style, it activates some mechanical linkage. When you turn the key to on, then push in on the key-the choke linkage will activate and pull the choke butterflys closed inside the carbs. Pull the airbox cover off and check the carb throats to see that this system works. You will have a hard time starting it (when the engine is cold) if the choke system does not work.

 

[Lion hunter]

Re: 1976 evinrude 85 hp. here is where im at!!

I think it is time to put the check book down and back away . Your heading on a rabbit trail and need to get back to the basics of troubleshooting. Start from the beginning. What's the compression, do you have spark, do you have fuel? In that order. It's hard to say at this point what the problem is and anything we suggest will send you off on another trail. I can attest that I have replaced parts and routed the plug wires wrong, missed a connection and even left out parts all together. So get back to us on the results of the troubleshooting and then when can narrow down the trail to send you.

 

[mkay]

Re: 1976 evinrude 85 hp. here is where im at!!

If you have fuel and spark give it a shot of engine starting fluid when it is cold. If you get a start attempt, the problem may be a blown crankshaft seal. On old 2 cycle engines the lower cylinder area generally called the crankcase is used to precharge the air-fuel mixture into the next cylinder. That's how it gets such a high power output per displacement. The crankshaft has to be sealed at each end by a seal pack. Since the seal pack uses a group of O rings, as the engines age the rings tend to leak and the intake of fuel and air is compromised a bit. This will seldom cause the engine too much trouble when it is running, but it will be hard to start when cold. In these engines the choke doesn't seem to pull fuel into the cylinders because the crankcase can't retain enough pressure differential. If the compression is good, atleast 110 psi and pretty well balanced a shot of fuel into the carbs usually produces an attempt to start as long as there is spark. Engine starting fluid has ether in it and will almost always produce a start attempt. Once these engines are running and warm a restart won't be a problem. Putting away the checkbook is a good idea. Good luck

 

[geoffwga1]

Re: 1976 evinrude 85 hp. here is where im at!!

I know this sounds silly and basic but you said you had changed the plugs.Did you make sure you had the leads the right way round? Most of us have done that at some time or other.
Geoffwga1