Is there a way to shorten throttle travel to WOT?

[doubletee]

It feels like I have to twist the throttle nearly 200 degrees to get to WOT. (Haven't measured it, so it's probably less, but still significant.) Any easy way to shorten the "throw" from idle to WOT, or would that be a dangerous mod?

[TearlessTom]

I doubt it but...

It does seem like a long roll but I think that is because the bike has so much power if it were shorter it would be way too touchy/sensitive to minute input for most riders. As for me 1/8 inch turn or less is the difference between acceleration/deceleration/constant speed.

If you could figure out some way of block and tackle you could do it but i would have to be some might small pulleys. You would need two sets. One for acceleration and one for deceleration.

Would be an interesting project.

Tom

[Sambeaux]

I haven't been into a throttle assembly for a while but if I remember correctly the cable travels around a pulley attached to the grip.  Don’t know if the housing clearances would allow for any modifications – but if that pulley could be changed out with a larger dia (limited to fit within in the housing ID), that would shorten the amount of rotation needed to get to WOT. 

If you wanted to get real creative...  If the pull was made with an eccentric curve - a smaller dia in the idle position getting progressively larger, you might be able to have the power roll on easily at first (for better control at low speeds) and then power up more quickly the farther around you twisted the throttle.  Would all depend on the clearence inside the housing - if any.

Might try to find a differnt model assembly with a larger pulley.

[doubletee]

If you wanted to get real creative...  If the pull was made with an eccentric curve - a smaller dia in the idle position getting progressively larger, you might be able to have the power roll on easily at first (for better control at low speeds) and then power up more quickly the farther around you twisted the throttle.  Would all depend on the clearence inside the housing - if any.

I like that idea. It would be like having a progressive rate throttle. Normal input in the early stages, increasing response as the throttle continues to rotate.   

[TearlessTom]

I haven't been into a throttle assembly for a while but if I remember correctly the cable travels around a pulley attached to the grip.  Don’t know if the housing clearances would allow for any modifications – but if that pulley could be changed out with a larger dia (limited to fit within in the housing ID), that would shorten the amount of rotation needed to get to WOT.  

If you wanted to get real creative...  If the pull was made with an eccentric curve - a smaller dia in the idle position getting progressively larger, you might be able to have the power roll on easily at first (for better control at low speeds) and then power up more quickly the farther around you twisted the throttle.  Would all depend on the clearence inside the housing - if any.

Might try to find a differnt model assembly with a larger pulley.

I was in mine 2 days ago lubrication it. There is no added room but I like how you think
Tom

[Ricky-D]

It would probably be easier to modify the pulley on the other end of the cable since it's in the open.

***

[Michvalk]

Mine requires less than it did after taking the slack out of the cables. Proper adjustment made a lot of difference. Could try that first.

[doubletee]

Mine requires less than it did after taking the slack out of the cables. Proper adjustment made a lot of difference. Could try that first.

Good thought. I do have a little slack in there.

(in my best bullwinkle voice) And now for my next stupid question, where does one make that adjustment? Is it on the handlebar end or near the carbs/linkage?

[Joe Hummer]

[ And now for my next stupid question, where does one make that adjustment? Is it on the handlebar end or near the carbs/linkage?

The best answer here is Yes.  Depending on how much slack you have in the cable, you can adjust it at either location.  It has been my experience that the carb is in a rough adjustment and the throttle end is fine tuning. 

Joe

[Ricky-D]

When adjusting free play in the throttle you should always insure there will be no binding in the cables when the handlebars are turned lock to lock.

You will find the best place to adjust the free play is with the handlebars turned full to the right, where the cables are the tightest.

If you adjust the cable free play at the position of greatest looseness of the cables, there is a possibility of unintended consequences at the most inopportune time.

***

[Michvalk]

They are right, some care is necessary when adjusting the free play in the throttle cables. Some play will remain after adjustment, but, if you take the time you will be able to do it. The adjustment on the handlebar end will not take a lot of play out. The adjustment on the carb end will get the majority and then you fine tune at the handlebar end. Make sure the cables dont bind by turning lock to lock and move the throttle wide open and let go back on it's own. Motor NOT running, of course. The service manual is very complete and does take you through step by step if you have one avalable. Good luck with the tinkering and hope this helps

[fudgie]

Yea take the slack out of the cables. I have none and along with the throttle rest it makes it alot easier. But yours being a black one, it will normally take longer to speed up. 

[doubletee]

Yea take the slack out of the cables. I have none and along with the throttle rest it makes it alot easier. But yours being a black one, it will normally take longer to speed up. 

Oh boy, now it's on!    (Now, where did I put that spare blower?)   

[Chrisj CMA]

Yea take the slack out of the cables. I have none and along with the throttle rest it makes it alot easier. But yours being a black one, it will normally take longer to speed up. 

In the old days in the AirForce...when they put an SR-71 up they put multiples up.....purpose: so you couldnt tell how fast they were one takes off in California one lands in New York.  Was it the same one? Who can tell? The black birds could have been sub sonic the whole times and by coordinating landing times APPEARED to be going real fast.  Or they could have been going REAL fast and by coordinating landing times APPEared to be going "normal" speeds

With so many black bikes who can really tell how fast they are, its just an illusion 

[Robert]

Basically in order to really make the travel different you would have to make a cam its really a fancy name for a spot the cable rides on and have it with like a lobe on it to change the diameter. Porsche after market makes one for some of their cars works well.

[RLD]

Just remember, if you make it faster, it will also require more effort; less leverage.