79 Evinrude 70 HP. Quick reference info needed

[btmoyers]

Hi Folks, <br />Picked up an Evinrude 70 HP '79 - Model 70973R - Motor today. Previous owner ran for me, starts great. I am going to finish rigging on my boat tomorrow. Had to replace my Chrysler 55! Anyhow....probably won't get a chance to pick up a manual 'til next week.<br /> <br /> Can somebody give me some quick specs. so I can get it fired up tomorrow. Plugs? Gap? What is going to be an acceptable compression range with the 15% +/- between cyls rule figured in?<br /><br /> Will chnge lower unit oil and take a look at pump/impeller in the a.m. Is there any qwerks to these models/years? <br /><br />Anything else I missed? Wud like to have on lake for saturday....<br /><br />Sorry for the long post...Excited about my new project...<br /><br />Thanks in advance.<br />Bill

 

[Bob_VT]

Re: 79 Evinrude 70 HP. Quick reference info needed

L77J4 plugs gapped at .040 your compression figures are correct +/- 10-15%.<br /><br />Bob

 

[btmoyers]

Re: 79 Evinrude 70 HP. Quick reference info needed

Thanks Bob,<br /><br /> I'm goin for the plugs this am. Thanks to you I'll know where to set 'em...Thanks agn<br />Bill

 

[btmoyers]

Re: 79 Evinrude 70 HP. Quick reference info needed

Does anyone have the NGK number/cross reference for Champion L77J4?<br /><br />Thanks...<br />Bill

 

[G DANE]

Re: 79 Evinrude 70 HP. Quick reference info needed

Try this one<br /> ( Swedish , but you will manage )<br /><br />Just choose Evinrude, prev 1999 or newer. http://www.kgk.se/ngk/snabbguidebat/ngk-bat.htm

 

[btmoyers]

Re: 79 Evinrude 70 HP. Quick reference info needed

Thanks G DANE...It took me a few minutes to navigate aroung the site....!<br /><br />

 

[btmoyers]

Re: 79 Evinrude 70 HP. Quick reference info needed

Last Night I took my carbs off to clean them as the fuel has probably been sitting in them for year(s). Any how I broke the plastic in-line Tee that supplies fuel to the top and bottom Carb. from the middle one. Can I replace this fitting with a Brass Tee. Or should It be plastic? Must it be an exact rplacement part?<br /><br />Thanks

 

[btmoyers]

Re: 79 Evinrude 70 HP. Quick reference info needed

Just bumpin' this up..Wanted to know if brass in the fuel line will be OK or if it does something weird I should know about....