1984 115HP Inline

[bobnteri@optonline.net]

Hi all,<br />When I go to wide open throttle with my 115 sometimes I only get to 4,000RPM then after a short time something kicks in and the engine goes to a full 5,000RPM on its own. Other times it goes to 5,000 right away. Any suggestions would be appriciated. (coil, switchbox.....?)<br />Thanks

 

[Clams Canino]

Re: 1984 115HP Inline

Could be a 1/2 fouled cylinder kicking in after it clears. <br /><br />But try spark testing all 6 too. Just hook a timing light to each plug wire to verify power. Then clean the plugs with carb cleaner and a terri rag.<br /><br />Past all that suspect a carb.<br /><br />-W

 

[Chris1956]

Re: 1984 115HP Inline

Bob, If it is a partially fouled cylinder, check the fuel pump diagram for a leak.

 

[MercFan]

Re: 1984 115HP Inline

Or or leaky needle + seat maybe? And as the rpm increases it's then able to better burn all that excess fuel?

 

[Texasmark]

Re: 1984 115HP Inline

Fouled plug cleaning out I would go with. It would repeat whereas carb problems should stay cleared out once cleared during the "boating season".<br /><br />Wouldn't hurt to decarb and put in a new set of plugs.<br /><br />Mark

 

[bobnteri@optonline.net]

Re: 1984 115HP Inline

Hi all,<br />Thanks for the replies. Checked spark with a timing light as recomended, I have NO spark on Cyl's 2 & 6 at idle. Is there a way to check coils or switch boxes. All wires on switchboxes are new and they are on correctly.<br />Thanks again

 

[Laddies]

Re: 1984 115HP Inline

Those 2 cyls don't share a trigger winding, so it's not a trigger. They do share a switch box and stator windings. Without a DVA it's not tpo easy to test, you may use a OHM meter to test the stator windings but the results are not as accurate as a DVA. Lacking a OHM meter one can aways change the wires one the 2 boxes and see if the problem stays with the box or goes with the stator wires, but either use new plugs or a spark gap to ensure its not bad plugs

 

[bobnteri@optonline.net]

Re: 1984 115HP Inline

Thanks,<br />did spark test again when engine was warmed up some. #2 cyl not firing and #6 is. Next i switched switch boxes and #2 fires and #5 does not. Would this be proof that the switch box is bad??<br />Thanks again guys,<br />Bob

 

[Laddies]

Re: 1984 115HP Inline

99% chance Bob