Throttle adjustment '84 6hp Yachtwin

[Vic.S]

I have been looking at the throttle adjustments of my Yachtwin. It runs fine but I noticed that the twist grip setting was all a bit further round than I expected. The 1st pic shows it in idling position.

I assume that I can alter that by adjusting at the adjuster on the cable in the 2nd picture and then readjust the idling speed with the knob on the end of the tiller. Am I correct so far?

I also notice that the the adjustment screw on the link between the cam follower and the throttle valve is almost screwed in fully. Is that right? I have no recollection of having altered it in the past. See the 3rd pic.

Is there any way that one can judge the extent to which the throttle valve is open without dismantling. Can i assume that the roll pin in the end of its shaft is at right angles to the flap. See the 4th pic. hopefully that is in the fully open position.

I was also wondering what the significance of the marks on the cam were, if any. They can be seen in the 5th picture more or less in line with the cam follower at idling position.

Any info or advice appreciated. Thanks.

 

[Joe Reeves]

Re: Throttle adjustment '84 6hp Yachtwin

The throttle/shift indications at the throttle handle are for reference only. You'll never be able to get them to line up perfectly. It's just a case of..... this direction is to go slow.... or fast. Trust me, that's a project that will drive you nuts!

The marks on the cam are to align the roller so that the throttle butterfly opens at the correct precise moment ie the throttle butterfly should just start to open when the roller is dead centered between those two cam marks.

You can easily make a amplifier tool so that you can see when the butterfly starts to move by soldering a length of single strand wire to an alligator clip, then attaching that alligator clip temporarily to the throttle shaft. That short piece of wire will move a great distance with the smallest movement of the shaft.