95 Evinrude-225. Miss under load

[GlasstronCVX20]

I have a 1995 225 Evinrude I just purchased and installed it on my Glastron replacing my 77-175. I used my old control system. Cables and electrical connectors plugged rite in. I verified the over temp alarms, trim\tilt as well as the choke operation.
The new engine starts fine cold or hot. Idles great and has good smooth power under all conditions under 2\3rds throttle. Anything over that it misses feeling like your prop is banging on logs under water. (Scary)
From a dead start to full throttle, it jumps up out of the water like its going gitty-up and go, and then immediately starts that missing again. It cruises at around 25 mph smooth, I push for 26 and it misses, back to 25 and its smooth. There is a fine line between the smooth and the miss. The only thing I noticed is the tach now only shows 800 RMP under all conditions. (May be a bad tach, the boat is a 1980)
Plugs are new; compression is 110 across the board. I ohmed out the plugs, coils and secondary ignition wires and there all identical. Choke only causes it to stall.
It had VRO on it but has been disconnected. (I mix the oil)
I see no visible leaks around the intake or 6 crabs. All wires look in excellent condition and
Suggestions?

 

[tashasdaddy]

Re: 95 Evinrude-225. Miss under load

possible spun prop, slipping. if not clutch dog in lower unit.

take a permanent marker, remove the prop, draw a straight line, like the picture. take the boat for a spin, make it do what it is doing. come home remove the prop, if the lines are still line up, it is not the prop, if misaligned, the hub in the prop has slipped, and need to be rehubed by a prop shop, or a new prop.

 

[flabum]

Re: 95 Evinrude-225. Miss under load

The shift cable may be adjusted too tight in forward causing the shift interupt switch to engage. back off on tha cable a couple turns and see if the problem goes away.

As far as the tach..... check to be sure you are charging....could be a bad stator or rectifier.

 

[GlasstronCVX20]

Re: 95 Evinrude-225. Miss under load

I noticed the interrupt switch doesn?t seem to be working on this in forward or reverse. Actually, I?m not sure it has one. As long as I pull or push the handle easy from forward or reverse, it comes out of gear fine.

 

[tashasdaddy]

Re: 95 Evinrude-225. Miss under load

shift is not suppose to be a slow easy shift. it is suppose to be a quick deliberate shift. the slow and easy eats the edges of the gears.

 

[GlasstronCVX20]

Re: 95 Evinrude-225. Miss under load

Thank you.
I understand the quick shifting INTO gear, I paid the price for that mistake on my 175. I was referring to taking it OUT of gear.

 

[flabum]

Re: 95 Evinrude-225. Miss under load

The shift switch does not activate until you go to take it out of gear. The gears and clutch dog have a 5* cut to help it stay in gear, the shift switch interrupts the ignition as you bring it out of gear to momentarily slow the engine. Your high speed miss could be the shift switch engaging as you throttle the boat up. You see, if you shift into gear and go at slow speed, the gear lever position is ok...then as you throttle more, the gear lever will advance a little more. If the shift cable is adjusted too tight in forward it will engage the ineterupt switch as you advance the throttle. I have seen this many, many times.


To adjust the shift cable...... put the control in forward, full throttle position. Put the engine in forwad gear as you lightly spin the prop. Once it is fully in forward gear, adjust the cable until there is no play then back off three turns. This will leave minimal play and enough slack as not to engage the shift interupt switch.

 

[Solittle]

Re: 95 Evinrude-225. Miss under load

Next time it starts to miss kiss the primer or shoot some pre mix directly into the carbs.

I suspect fouled carbs.

 

[ezeke]

Re: 95 Evinrude-225. Miss under load

The easiest way to check the shift interrupt switch is to disconnect the black ground wire running from it to the block. Just be careful because you may find it very hard to get out of forward gear.

You may be going into S.L.O.W.

You need to check your rectifier/regulater. While it may be the tach, it is risky to run with a bad rectifier. See Joe Reeve's Article in the Engine FAQ forums for quick checks:
http://forums.iboats.com/showthread.php?t=190636

 

[reeldutch]

Re: 95 Evinrude-225. Miss under load

i would check the stator output at high rpm.

sometimes the voltage goes up at higher rpm and might cause a bad winding in the stator to jump to ground.

checking the stator for short to ground will show nothing because there is not enough voltage for it to jump(spark) to ground.

you got to check the output at high rpm.when it happens.

this wil briefly show dips and spikes in voltage.


to simplefie it i would check spark with timing light at high rpm .