1985 115 evinrude will not idle.

[daleb]

I have a 1985 115 evinrude that will not run for more then a few seconds under 2000 rpm it slowly loses rpm and dies unless I hit the primer on the key switch then it comes back to life for a few seconds and starts dying again. Runs great when the rpms are up and you get the boat up on a plane. Installed new fuel filter, new fuel pump. Any ideas ?

 

[emdsapmgr]

Re: 1985 115 evinrude will not idle.

When that engine is at idle, the carb butterflys are closed. When fully closed, the idling engine relies on fuel to be delivered through special, small passageways in the upper carb bodies. It is common for these small passageways to get restricted from dried fuel over many years, or improper winterization. Once you open these butterflys (raise the engine rpm's,) the carbs deliver fuel through other jets and it may run fine at higher rpms. You may need to pull the carbs apart and spray some aerosol carb cleaner through all the passages, then reinstall them. Esp, check the outlet flow rate of the carb cleaner from one carb passage with that same passage on the other carb, then go on to the next passage.

 

[demon1]

Re: 1985 115 evinrude will not idle.

mine did the same thing but before I went thrue all the work to do the carbs I did a compression check. it only takes 5 minutes and that was my prob .low comp in one cyl. . It ran fine fast but idling would get slower and slower till I bumped the gas then it would do it again. hopefully its your carbs but its a lot faster to do a compression check

 

[tashasdaddy]

Re: 1985 115 evinrude will not idle.

start at the beginning, compression and spark test, then fuel check, dirty carbs.