86 Evinrude 120

[btagieff]

I'm fairly new to boating and have three questions.<br /><br />1) taking the boat back to the the marina at idle speed yesterday I found the engine was smoking alot. I understand that all 2 strokes smoke especially at startup.<br /><br />2)My tach only seems to work intermitantly, generally only when I'm above about 3500 rpms.<br /><br />3)What is the max rpms for this engine?<br /><br />Thanks for your help.

 

[93bronco]

Re: 86 Evinrude 120

this is for an 1988 120/140 to give you an idea.<br />full throtlle range 5000 to 6000<br />idle timing 8 degrees ATDC<br />power rated @ 5500 rpm 120=120 / 140=140<br />max spark advance 18 degrees +/- 1 degree BTDC.<br />hope that atleast gives you an idea. the 1985 to 87 have a smaller bore than the 1988 + years.<br />-<br />these motors are easy to work on, but you need to get both a service and a part manual from omc/bomb. or try ebay.

 

[btagieff]

Re: 86 Evinrude 120

Thanks for the info. Any idea on the tach problem, or if the smoking is normal?

 

[Sal G]

Re: 86 Evinrude 120

Intermittant tach operation sometines signals a faulty alternator/rectifier.<br />This unit is packaged as one and runs around $100.<br />Check your wire harness on your control box to make sure there is a solid connection. Check the pins(male) and coupling to make sure all the contacts are clean. 2 cycle engines smoke quite a bit especially during initial startup anf idle.<br />Does it smoke when running on the water.<br />Gather your engine is a VRO (I've got a 140 1985 VRO) You may be running a tad rich.

 

[btagieff]

Re: 86 Evinrude 120

Going back up to the boat Thursday, and will check the contacts and wiring for good connections. It is a VRO and I will make sure that the engine is truely warmed up before checing smoke level at idle. Thanks for your help.