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1983 Evinrude 35 jumps or hiccups at regular intervals...

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yello_zebra

New member
I have a "new to me" 1983 Evinrude 35 longshaft on a 1960's Boston Whaler 13'6" that has a regular hiccup or jump at what seem to be regular intervals when underway.

Here's a short video of the symptom, you'll see the engine twitch, it actually shakes the boat pretty violently when it happens.


http://youtu.be/3x5WVLu_CUw

I'm trying to determine if it is an electrical, fuel, or mechanical problem (possibly with the lower end).

It has electronic ignition, CD2 CDI. All the electrical connectors appear to be tight and in good condition without corrosion.

Compression numbers are good, 126 and 128.

A few more videos of it idling and running out of the water...

http://youtu.be/gRahQ1FFXx0 (warming up)

http://youtu.be/tYKffnW1CHw (running)

Any and all advice or troubleshooting steps are greatly appreciated!

YZ
 
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Other symptoms / issues:

- the throttle lever on the remote control (throttle only, not transmission) doesn't really work
- the throttle / trans lever on the remote control shifts fine but only has a small range at the very end of the position.

It seems that the cables are either poorly adjusted or corroded perhaps. I'm wondering if this could be causing an issue with the transmission not being far enough in gear and thus causing the jump at high speeds???

I'll see if I can figure out why the remote controls only have a throttle effect at the very end of their throw range.

I'm also wondering if it could be a faulty CDI CD2 electronic ignition? Rectifier? Or coil pack?

I'm going to put a timing light on the the spark plug wires tonight and see if they flash in a regular pattern of if there's a hiccup to the pattern.

YZ
 
Classic case of a worn out clutch dog in the lower unit. Every time it bangs, it gets worse. Ignore it and it will destroy the forward gear and shift linkage too. Having said that, from your description, you also have control problems. You need to disconnect the shift cable from the motor and run it to see if it bangs when running with manual shifting. If you get real lucky, the problem may be the control only and not the motor. But don't hold your breath.
 
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