70HP Evinrude Firing Problem

[miichael]

I have a 1971 evinrude 70HP and the top plug and bottom plug are firing fine. the middle plug will no fire at all. i tried the same plug in all cyclinders knowing the plug is good fires on 1 and 3 but 2 wont fire. since 1 and 3 are firing what needs to be replaced and how much money am i looking at? going to take it to get it fixed tomorrow need to know what the problem probally is that way they wont try to sell me everything else that it dont need. since 1 and 3 fires it couldnt be power pack right? probally bad coil or magneta or something? also does my motor have points in it? if so does it have set of points for each cyclinder or 1 set that works all 3?

 

[rolmops]

Re: 70HP Evinrude Firing Problem

Hello.<br />Your first expense should be a manual for your engine.It has the potential of keeping a lot of money in your pocket.<br />When you say "does not fire",do you mean that the cylinder does not start up or that the plug does not spark?If the plug does spark,your problem is fuel supply to this cylinder.<br />Before you take it to be fixed,try and start it in the dark with the engine hood off and pay real good attention to the sparkplug wire that goes to the middle cylinder.If you see blue sparks coming of it you should replace it and thereby solve your problem.Anyways,first try to replace the wire and from there on go by trial and elimination.<br />Good luck.

 

[miichael]

Re: 70HP Evinrude Firing Problem

i hooked a plug to the wire and grounded it and the plug does not fire. i dont know if u can change the wire on it it doesnt plkug on its made in the coil or magneta.

 

[rolmops]

Re: 70HP Evinrude Firing Problem

You should be able to remove and insert the wire in the coil.

 

[miichael]

Re: 70HP Evinrude Firing Problem

tried that no luck its getting dark now so i changed coils around put coil 1 on coil 2 and 2 on 1 in power pack 1 fired perfect like it did so that tells me power pack is good. i noticed the spark is there but its not enough spark to burn its very low spark so the coil is bad i suppose.

 

[miichael]

Re: 70HP Evinrude Firing Problem

got the coil off noticed theres a small crack in the coil and the wire going from the power pack to coil looks as if its burnt into very loose so im guessing thats the problem the wire is burn into not sending enough to make spark plug fire. how much do u think coil will run me? like 71-73 model 70HP envinrude

 

[rolmops]

Re: 70HP Evinrude Firing Problem

No idea.

 

[miichael]

Re: 70HP Evinrude Firing Problem

do u know a website i can order one?

 

[rolmops]

Re: 70HP Evinrude Firing Problem

Any omc dealer,Boatshop,marina or napa store in your area should have them.Napa has the Sierra brand which is an after market product.For online stores,try: www.tcoutboard.com this is only one out of many,it is just that I happen to know the web adress

 

[miichael]

Re: 70HP Evinrude Firing Problem

napa auto parts?

 

[DJ]

Re: 70HP Evinrude Firing Problem

miichael,<br /><br />Yes, NAPA. You may have to educate them on the fact that they have a "marine" catalog.

 

[miichael]

Re: 70HP Evinrude Firing Problem

ok great i hope they got it in stock because i really wanna go fishin tomorrow lol. thanks for all your help!