Hi I have a Shakespeare 54lb thrust electric outboard and throttle does not work. Handlke twists but then get various responses and cannot turn engine off etc.

No sir. You need to remove the side panel

Fix Tiller Handle on 15hp Evinrude - YouTube

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www.youtube.com/watch?v=dl0b7WFKsjc
Mar 30, 2011 - Uploaded by Budnipper82 Evinrude 15 HP gear removal - Duration: 9:11. by kodibass 7,404 views. 9:11. Repairing an Evinrude 9.9 ..

If your old engine/control has the same 'options' as the30hp, yes everything is compatible... (Electric start or trim )
The throttle and shift cables are allways compatible...

In The Under Side Of The Tiller Is A Screw Loosen It Off That Is The Throttle Tension er, On Some Models The Front Portion Of The Grip Rotates And Tensions The Throttle

Have you tried pushing the button on the end of the handle (where your thumb is)?

It sounds like the prop bushing is bad. There are 2 systems for preventing gear damage,shear pins and rubber prop bushings.

The rubber bushing can be molded to the prop or there is a type that has a sleeve the prop fits over. If the prop has no sleeve you need to take the prop off and have it relined. It will fail soon, its just a matter of time. If you have the removeable sleeve, you replace the sleeve and just slide the prop over it and you are done.

The diminished thrust is due to the rubber slipping from its bond and it will get looser and looser.

Unfortunately, those units have a circut board at the power source and if there is no fuse you more than likely destroyed that board. Take the casing apart (the part attached to the boat) it should be two halves. That inital board you see is probably what is destroyed. Of course before i did that I would look for an inline fuse near where the cables attach to the battery or under the unit in the nose of the boat. There is nearly always a fuse if it came from the factory or dealership with the unit so i'd play a little extra hide and go seek for that before doing anything else.

Best of Luck

This is because of the worn out clutch unit on your bike you need to get
serviced and clutch overalling on your bike and also need to get clean carb ,
to stop this problem ,if increase idling on your bike it give low mileage .

Check the batteries, they need at least 12+volts to run scooter. Blinker may be burned out or the wire came loose. If batteries are charged Two things That could be wrong are: Twist throttle is NO Good, Or the controller is BAD. You need a voltage tester, (Disconnect the Wiring Harnesses) and check voltages coming out of the controller(the silver BOX with lots of wires) and see if it is sending voltage to the twist throttle. Controller wires to the Twist throttle should read 4-5 volts.

(Make Sure You Unplugged That Wiring Harness) There is 4-6 wires in that Wiring Harness then find + and - test them for voltage from that Controller box wiring harness. If You get a positive reading out of that Controller wiring harness then the Twist Throttle thing is bad. If you get NO READING out of that Controller Wiring Harness Then if is BAD. Normally it will be the dead batteries or the Twist Throttle that go bad. Batteries are expensive, Twist Throttle Cheap. Good LUCK

According to the intructions and I quote "Take off the cowling that covers the spool, twist off the pick up mechanism clockwise and a half turn anti clockwise will remove the spool"