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I have a 1994 yamaha 85CS for which the control box is stiff. The cb has the key switch, toggle choke, and kill switch (going downwards in that order) on the front face, has the lever throttle advance on top, and push to open throttle with rocker switch on the outer-upper handle for the T/T.

It has eight screws on the outside plate and a adjusting tension screw on the hindplate.

I'm looking to reduce the length of travel it takes to upthrottle. As it is, it takes quite a bit handle movement from idle to begin opening the throttle. Also it is stiff.

Questions:
Will I crap this up if I start taking this thing apart?
Does it work like a steering flex cable needing the grease in the tube reworked to smooth out the operation?
How stiff is stiff enough? (hold comments).
How do I find the control box model and a schematic? (yes I've looked already)

Thanks, RB

Most of the time this problem you have is the Cable itself not the box but did you adjust the tension screw?, To test, take the throttle and shifter cable connectors loose from the control box and the engine where they connect to the linkages. Try to slide them manually back and forth. If they are tight and hard to push/pull you can try putting some grease around the ends but the best bet and probably the only bet is to buy new cables. They are pretty cheap, usually about 20-30 bucks a piece. If the cable is not the problem, and the shifter is, I would give it a good coating of grease and see if that works. As for reducing the travel length, the way I do it is take the connectors loose at the box and or engine and loosen the locking nut on them and screw the connector in or out depending on the direction needed to achieve less travel. Hope this helps.

RodBow wrote:I have a 1994 yamaha 85CS for which the control box is stiff. The cb has the key switch, toggle choke, and kill switch (going downwards in that order) on the front face, has the lever throttle advance on top, and push to open throttle with rocker switch on the outer-upper handle for the T/T.

It has eight screws on the outside plate and a adjusting tension screw on the hindplate.

I'm looking to reduce the length of travel it takes to upthrottle. As it is, it takes quite a bit handle movement from idle to begin opening the throttle. Also it is stiff.

Questions:
Will I crap this up if I start taking this thing apart?
Does it work like a steering flex cable needing the grease in the tube reworked to smooth out the operation?
How stiff is stiff enough? (hold comments).
How do I find the control box model and a schematic? (yes I've looked already)

Thanks, RB

RB, the amount of travel is normal. All that initial travel is moving the shift cable. Should be the same amount of travel shifting to forward or reverse. As for the stiffness, there are some wheels and rollers in the box that need a good amount of grease. But, more likely, Kirt is on the money. The stiffness is probably in the cables. I would offer the same advice as Kirt. Now, in response to your first question, the box is relatively simple. Usually the worst part is getting the screws out if it's a saltwater application. Once the screws are out, getting it apart is easy. There are a couple if things that have to be just right to get it back together, but it isn't that difficult. The box has to come apart to change the cables.

I've had several apart and they worked when I put them back together. I know Jumptrout has been inside a few, also. It can't be too difficult.