86 Evinrude 90 VRO Idiling too high

[gfuller40]

Hello -

I recently purchased a 1986 Evinrude 90hp VRO (disabled). The problem I'm having is that after starting, or revving at all, the engine is idling way too high, like too high to shift into gear without blowing the tranny. I've been running it with the cover off to manually push the linkage down as far as I can so that I can get it into gear. I have already adjusted the control cables as much as possible, but it is still not releasing enough. My question is, there is an adjustment screw/nut that will allow the throttle(s) to come back all the way down regardless of the position of the stator pushrod bracket thing (please excuse my lack of terminology). What does the pushrod going to the stator do? can this and the throttle position be out of synch?

Thanks!

 

[Cricket Too]

Re: 86 Evinrude 90 VRO Idiling too high

I believe what you are calling the "stator pushrod bracket thing" is the timing advance for the timer base which is located under the flywheel and looks like it's inside the stator, but it's a separate part.

You may want to try what is called a Link and Synch, which synchs up the timing and throttle opening. Get a manual for your engine and it should have the procedure in there, or you can do a Search on this site for Link and Synch and I'm sure the procedure will come up.

I would start here and see how that works, but you may also have to play around with other adjustments. Generally it's not a good idea to play around with the cable adjustments until you know everything else it set correctly.

 

[gfuller40]

Re: 86 Evinrude 90 VRO Idiling too high

Okay - I've done a bit of researching the Link & Sync - looks pretty easy and straight forward - I'll give it a go and see what I can figure out. I started at the cables because it felt like there must be some slack or something in them which was causing the whole throttle setup to not fully release. It's stopping about a quarter inch from as far as it can go down (idle down). not sure if this is normal, but i don't have anything to compare it to.

 

[ezeke]

Re: 86 Evinrude 90 VRO Idiling too high

Try this first:
Take the air silencer cover off the carburetors so that you can see the throttle plates;
With the control arm in neutral, warm-up lever down, the throttle plates should be fully closed;
When the control arm is fully advanced, the plates should be perfectly horizontal;
The plates must be perfectly synchronized throughout the full range of motion.

BTW, Synchronization and linkage adjustment is a step-by-step procedure that must be done in order to be successful. It varies from motor to motor, so it is best to have the model-specific factory manual before proceding. http://www.outboardbooks.com/index.cfm?fuseaction=search.main

 

[gfuller40]

Re: 86 Evinrude 90 VRO Idiling too high

OK I popped the cover off. With the throttle an idle lever down, there is an equal gap of about an 8th to a 6th of an inch in each Carb. At wot the flaps actually pass the horizontal stage and are pointing up.

 

[ezeke]

Re: 86 Evinrude 90 VRO Idiling too high

Ok, you need to have the throttle plates fully closed and perfectly synchronized when at idle. Disconnect the throttle cable and then adjust. When done, adjust the cable to the connection using the trunnion and then reconnect.

The throttle plates need to be perfectly synchronized throughout the entire range of motion and should not go beyond the horizontal.

 

[gfuller40]

Re: 86 Evinrude 90 VRO Idiling too high

As far as i can tell visually, all the throttle plates are in sync. When I disconnect the main control cable (the one going into the engine from the controls) and manually push the whole system back as far as it will go, the plates still do not close all the way. I can, however, adjust the throttle adjustment screw to close them at idle. I've tested this out and at full throttle they are perfectly horizontal. I have not yet run the engine like this, but it looks like it might work...

The idle stop screw (the one with the little rubber boot on the end) is about a quarter to half inch from making contact with anything, should this be backed out so far?

Let me know your thoughts. I can always take pics if i need to also. Thank you so much for your help again!

 

[GeneH]

Re: 86 Evinrude 90 VRO Idiling too high

As stated in a previous post, if you are going to try to do it yourself, you really need a factory (not aftermarket) manual for the exact engine you are working on.

 

[noelm]

Re: 86 Evinrude 90 VRO Idiling too high

you seem to be jumping from place to place, it needs to be done methodicaly from start to finish, do not start adjusting things all over the place, the very basics need to be taken care of, step by step, people have offered help and advice, take it!

 

[ezeke]

Re: 86 Evinrude 90 VRO Idiling too high

Please don't make any adjustments to the timing or to the throttle lever until you have the carburetors adjusted so that the plates are fully closed when the center of the cam follower roller is aligned with the raised mark on the cam.

You have to adjust the carburetors to the cam; you are trying to adjust the cam to the carburetors. The more you try, the worse it will get.

 

[gfuller40]

Re: 86 Evinrude 90 VRO Idiling too high

ezeke,

All i did was back out the throttle adjustment so that the carbs are closed when it should be idling, fired it up and it seems to be idling great now. I did not touch any timing. I will have to check and see if it if the roller is hitting that point when just engaging the throttle.

 

[gfuller40]

Re: 86 Evinrude 90 VRO Idiling too high

Fixed the idle by tweaking that one adjustment that closed the carbs fully - now onto the next problem......