Twitchy throttle control
 

Kev's latest mod.

As most of us know the XT660 is hard to control in traffic conditions, tight corners or traffic circles. So I have come up with the mod which can be applied to our XT's.

This is a very clever mod & works well if you want more throttle control, I found the idea on the net.

I lowered the cable by 1mm in the grip to try it out first, day 2 of testing I went a further 5mm around the throttle to 20mm, it now has so much better throttle control at low speeds.



http://i201.photobucket.com/albums/aa202/kevxtx/b-9.jpg

http://i201.photobucket.com/albums/aa202/kevxtx/c-7.jpg


http://i201.photobucket.com/albums/a...evxtx/bb-2.jpg

http://i201.photobucket.com/albums/aa202/kevxtx/d-6.jpg

My final depth is 2mm deap after testing.

http://i201.photobucket.com/albums/aa202/kevxtx/e-5.jpg

I used a 2mm drill bit to cut the groove, I used the edge of the bit to do the cutting not the tip, I rolled the grip along the side face of the drill bit to keep the circular angel of the twist bit.

http://i201.photobucket.com/albums/aa202/kevxtx/f-4.jpg

http://i201.photobucket.com/albums/aa202/kevxtx/g-4.jpg

http://i201.photobucket.com/albums/aa202/kevxtx/h-4.jpg

http://i201.photobucket.com/albums/aa202/kevxtx/i-4.jpg

http://i201.photobucket.com/albums/aa202/kevxtx/j-3.jpg

http://i201.photobucket.com/albums/aa202/kevxtx/k-2.jpg

On day 2 of testing I have now cut the grove 20mm along the grip to give me a reduced diameter up to 30% throttle opening.

http://i201.photobucket.com/albums/aa202/kevxtx/L-1.jpg

http://i201.photobucket.com/albums/aa202/kevxtx/M.jpg

http://i201.photobucket.com/albums/aa202/kevxtx/N-1.jpg

http://i201.photobucket.com/albums/aa202/kevxtx/o.jpg

http://i201.photobucket.com/albums/aa202/kevxtx/p.jpg

Looks like a great idea!

This mod does work on the XT, I found the throttle is less sensitive at low speed which gives you better throttle control.

I done this Mod this morning and it's a vast improvement over the standard bike especially with your O2 mod as well. I can't believe how different and better my bike is now compared to the standard bike. Many thanks Kev your efforts are appreciated.

Good news, thanks for your feed back. How many mm did you go down to?

Like me I can't believe how this mod has changed my bike when riding in traffic, this is got to one of the best kept secrets.

It would make off road riding so much more controllable.

I went down by approx 2 mm like yourself and was very impressed with the result. I can't believe more people havnt taken up on this mod it's so easy and quick to do !

Well done min. Good thinking.

Thanks for the feed back, I wish I came across this mod years back.

Silly question perhaps, but how hard is it to get the grip off? Is it stuck on there like crazy or will it just slide right off when you take off the bar end weights?

It's really easy to slide off as it rotates around the handlebar. I must addmitt it was alot easier than I was expecting, all becomes obvious once you take the cover off where the kill switch is. Kev's pics are a great help!

Great, thanks. Thinking I'll give this one a go. Maybe it will smooth out the jerk when going from closed to open throttle

Will do this when I get my bike back from the shop.

As much fun as it is to power slide in the dirt, it can make it a bit more than interesting in the tight stuff as it is.

Very simple cam action when you think about it, great Kev.

Hi Kev,

so if i get it right you used a 4mm drill to do the 2mm groove, or? Why do i need to measure it first (1mm measurement picture)?

I used a 2mm drill bit & lowered the cable height by 1 mm.

From the feed back I have got on this mod some riders are happier with lowering the cable height by up to 2mm. If you find your throttle still twitchy at 1mm go down a further 1mm to max 2mm depth.

I braved it!
 

Just tackled this mod, I was a bit skeptical as im not the most technically minded lad! but it was easy, even for me. It took no more than half an hour start to finish. I didn't measure the depth I drilled but would guess it was about 1.5mm. Only took the bike down the drive as its waiting on MOT but it seemed better already, Will post back later when I've crept through some traffic and tested it properly!

CHEERS KEV!

Did you drill on both sides?


OT: Btw how come I,am not a XT supporter, I have paid for it?

no, from what I saw on kevs pictures he just did the one side. However I may be wrong. I will wait on his reply to confirm this!

Kev proves once more that he is a genius, I must do this one next weekend....

You only drill the pull cable side, the reduced throttle cam raduis allows for better throttle control.:072:

this mod affects the full open throttle and the max speed of the bike,because it reduces the travel of throttle rotation?

It did not on my bike, even with the throttle cam reduced the throttle does not reach the throttle stop at 100% throttle. If you find on your bike that you do not have full throttle at the throttle body when the twist grip is at full throttle cut a bit off the throttle stop on the twist grip.

I did the mod yesterday on my bike. Just 1mm and it works great. The trottle is a lot smoother...

Oi Kev, this mod sounds great BUT as my technical skills are er limited, would you consider selling me the bit ready modified with the groove cut??? And I could then resend you mine to modify and resell to the next guy. What do you think????

Yep works great... :signthankspin:...
Have done it to both my bikes XTR & TTR250...

Was more noticable on the TTR which was quit
snatchy off & on the throttle , made it alot smoother...
better for slower tight stuff...

The problem is I have not owned a XT660 since 2011 & don't have a spare twist grip to modify, may be someone in your area could offer you a hand with the mod.

Simon - A genuine Yamaha throttle grip assembly is less than �15.

http://www.yamahamotorcyclespares.co...62400200&uid=0

At that price, just buy one and have ago at doing the mod yourself. What's the worst that could happen? At least if you buy one to work on you still be able to ride your bike if you bu99er it up, and if it works - well you could mod the other one too and sell it on and get your money back! :D

Hi,

Did this mod yesterday and I can say throttle reposnse is really smooth now.
Its really easy to do. This should be on Yamaha list how to make their bike better !

Thanks to all who invented this mod !

The mod works well on any bike with throttle cables.

Apologies for the bump of this topic but am I reading it correctly that all you are really doing is cutting a groove in the tube where the cable meet the cam ??

In a nutshell, that's it! Simple mod, but very effective.

I did this Mod a few days ago. Have to say it transforms slow riding between the cars. Great Mod and thanks to Kev.

No worries, I have just done the mod to my new MT09 works a treat on that bike as well.

Just completed the mod.. Do it do it do it! So simple so amazing. 25 mins (including 5 looking for a dropped screw)

Done !! That's another mod ticked off the list. I've got a feeling it may just give the Cush drive an easier time of it too.

Throttle
 

Hi All, Just done the mod to throttle, definately helped with jerkiness at low openings, I have my co adjusted up to 40 on the dash settings. Don't know if this is ok but seems to be lts better. Started at 15 and worked up with road testing each adjustment. Just to say I did mine easily with throttle in situ using a dremel with small rotary file. Just held Dremel still and rotated throttle. Just saves a bit of time thats all.:fish:

keeper hole?
 

Hi all,

Iv'e just done this throttle mod while I had the housing apart but I'm wondering if there is supposed to be something stopping the housing slipping towards the brake lever?

I swapped to a majura bar some time ago, it has a hole that i'm guessing accepts a pin from housing but the xt housing / the bar it came with doesn't seem to have one (pin in the housing or hole in the bar).

Just a heads up as well as when the grip slides towards the brake lever it jams the front brake on (i found out the hard way). I had a fall (over) that must have loosened the throttle grip and it later slid inwards, I never noticed until it did so while riding, jamming fast the front caliper : 0

So is there something I can do to stop the grip sliding in?

You can make yourself a locating pin out of a self tapping screw inserted into the switchgear and cutting the head off.

http://i95.photobucket.com/albums/l1...0/DSCN7788.jpg

Alternatively a bead of Loctite can give just enough extra sticking power to stop unwanted movement.

Thanks pleiades, I thought I was missing something, the loose throttle housing left me in a dangerous situation, only a simple slide and presto, front brake- full lock.

the majura bars do have a hole but it's not in the right spot (too close to the brake) however a grub screw will act to stop the housing from going near the brake lever. I might try some loctite as well to stop it turning.

Does one just cut the groove in the front end, or both sides where the cable is on top of the grip? - Just read page two, thanks

Just did mine, easy with Dremel, will test tomorrow