Throttle grip movement reducer - 180 deg to 90 deg

[MarkE]

Hi,
I'm not sure how to ask this question, which is probably why I've not had much luck with Mr Google, but here goes!

The throttle travels 180 degrees from idle to full throttle. With my bike on the track, I like to use the second half of that movement and it's not comfy. Anyone know if there is anything I can fit/change that will reduce the travel needed to give me full throttle at 135 or even 90 degrees? Less movement will give better response and may help to make acceleration smoother in to corners.

I ride a 2011 Yamaha FZ8N.

[Ender EnZed]

You're after a quarter turn throttle (or 1/4 turn). Google and KB search should both know what that is.

[Subike]

It can be done by altering the length of the activating lever arm on the throttle bodies , and the spring tension to reduce the load of the shorter activating lever, Im sure someone here will be able to explain it better and in detail.

[nosebleed]

What you're looking for is a "Quick Action Throttle"

They work by increasing the diameter of the cable tube at the grip, and they look like this;

http://www.bikersdiscountstore.co.uk...tle-pd-128.php

http://www.motospares.com.au/categor...ION-THROTTLES/


A quick (ghey) video on the install and result of the QA throttle here;

http://www.youtube.com/watch?v=kGpNxB8yeqA

For a cheaper option you will find that bikes can "cross-platform" some components like throttle tubes so you can install a different tube to acheive a similar result
For example the Aprilia will take the R6 and R1 tubes which have a larger diameter cam than the stock Aprilia tube, and I can confirm that the R1 tube is an easy install and works for a faster twist.

[imdying]

One 1/4" wide cable tie, one tube of Araldite (ok, 2 :P), stick that around where the cable runs on the throttle tube, and you're done

[98tls]

Definately worth doing,fitted a 1/5th insert on my old S years back.

[nodrog:Me]

It can be done by altering the length of the activating lever arm on the throttle bodies , and the spring tension to reduce the load of the shorter activating lever, Im sure someone here will be able to explain it better and in detail.

Yeah, you may need to buy new carbs.

[bogan]

180 deg standard, jeez no wonder you want it quicker, all the bikes I've had have been 90deg or less.

imdying's suggestion is good for a little bit quicker turn, I'm picking you've just got your degrees mixed up and currently have a 1/4 turn and want a 1/5th or 1/6 turn.

[sinfull]

Seen what Imdying suggested done but with plastic milk bottle caps that had been cut and shaved !

The zip tie sounds good but instead of going once around, cut it into progressively shorter strips and glue em on to build a lump of them or a cam effect on the throttle tube !

What will happen is that you will still have the smoothness you have now at the start of your turn for feathering in corners etc but when the cam starts rising you only need a slight twist of the wrist to reach full throttle !

[imdying]

If you want to make a proper cam, here's what I do:

- Get two hole saws, one for the OD of the cam, the other for the ID of the existing throttle tubes cam
- Get a sheet of suitable material, persepx or whatever
- Cut the inner hole
- Cut the outer hole
- Take your donut, then cut a groove around the OD to give the cable a guide
- Cut the donut/circle into an arc to fit your tube (will be obvious when you look at it)
- Glue the donut into place
- Profit?

Domino sell many throttle assemblies with replaceable cams so you can tune it to what you like best. They're not expensive either.

Altering the carbs linkage is a cunt of a job... best avoided.

[davebullet]

2008+ speed triples have a 1/4 throttle - maybe get one from a wreck?

[MarkE]

Thanks for all the responses folks.

I have a correction - it does actually only travel 1/4 turn (90 degrees) - should have actually measured before writing! That said it doesn't change the fact that, to me, it feels a lot of movement when I'm on the track. I'm going to have a go at making it quicker - maybe a 1/5 or 1/6 as suggested below.

I'll update the thread with results after the next track day.

[mossy1200]

Thanks for all the responses folks.

I have a correction - it does actually only travel 1/4 turn (90 degrees) - should have actually measured before writing! That said it doesn't change the fact that, to me, it feels a lot of movement when I'm on the track. I'm going to have a go at making it quicker - maybe a 1/5 or 1/6 as suggested below.

I'll update the thread with results after the next track day.

r1 throttle tube 1/5
r6 throttle tube 1/6

both should fit and will be under 10usd plus freight on Ebay.

[DEATH_INC.]

Just learn to 'overgrab' the throttle...it's a technique I learnt for MX ages ago...it allows you to keep your arms up at full noise. It's pretty simple, just before you wind the gas on let go of the grip, rotate your hand forwards over the grip a bit then grab it again and twist, at full throttle your hand won't be as far back. Bloody simple eh? Don't forget to let the grip slip back when ya grab the brake tho...
I've ridden big roadbikes with quick throttles and I'd rather a stock one thanks.
Edit; Also fwiw MX bikes usually have quick turn throttles...prolly too quick for a roady, but you could try one...

[FROSTY:Me]

If the throttle is close but not quite there why not just wind up the idle to 2.5k.