Home made throttle cam.

Here be mechanigeeks. Anything technical that is not a teething problem.
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kevxtx
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Home made throttle cam.

Post by kevxtx » Thu Jun 02, 2011 11:55 am

Not my invention but have done this mod on my Yamaha XT660X before to get rid of the twitchy part throttle openings & throught I would apply it to my SMR. It works rather well & now have better throttle control at part throttle openings & it costs nothing.

You basically regrove the cable guide down by 1 to 2mm from the cable nipple to the first 30% of the total opening distance, this allows for better control at small throttle openings.

Carry out this mod + 16T front sprocket & turn off the O2 sensors & you will see who smooth this bike can be.

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Re: Home made throttle cam.

Post by Rangoonruns » Thu Jun 02, 2011 7:34 pm

Thats exactly what my dealer does rather than fit a new throttle! Well done :D
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Ultra54
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Re: Home made throttle cam.

Post by Ultra54 » Fri Jun 03, 2011 2:05 am

I like the way you think brother. I'm going to do it this weekend but might use my dremmel tool to cut the groove.

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Re: Home made throttle cam.

Post by phanson » Fri Jun 03, 2011 8:09 am

Ultra54 wrote:I like the way you think brother. I'm going to do it this weekend but might use my dremmel tool to cut the groove.
If anyone can - Dremmel can.

(Not sure if that TV advertisement ever went to the US.)

This mod seems to be the new 'must have' for these bikes.

I can't think of a viable reason why you wouldn't want to do it.

For those that have - just how far extra do you need to twist the throttle, to get the beast really accelerating?
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Re: Home made throttle cam.

Post by kevxtx » Fri Jun 03, 2011 10:39 am

I have taken the mod a little further, I have build up the throttle cam with (plastic epoxy that sets rock hard) from where the cable comes out the drilled groove that I made & raised the level by 1mm all the way past full throttle point, this has made the power come on quicker after half throttle.

Now I am happy, easy throttle control low down & the power feels like it comes on quicker after half throttle.

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Ultra54
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Re: Home made throttle cam.

Post by Ultra54 » Fri Jun 10, 2011 2:06 am

So I did this mod today and it made a big difference and I mean in a good way, thanks again for the idea.

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Re: Home made throttle cam.

Post by dave1100xx » Wed Sep 21, 2011 5:13 pm

There are some classics like this mod that should be pinned so it doesn't get lost!
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Re: Home made throttle cam.

Post by Stormin » Mon Sep 03, 2012 6:32 pm

After having been touring last week and finding that the snatchy throttle that I always tried to work round was a real pain in the arse on wet roundabouts I am gonna give this mod a go. However when you say that this along with a 16t front(which I have) and the 02 sensors turned off really smooths it out my question is Can I turn off the sensors with a standard exhaust. Thanks

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Re: Home made throttle cam.

Post by Ultra54 » Mon Sep 03, 2012 10:02 pm

No, you need them because your stock canisters contain catalytic converters within them.

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Re: Home made throttle cam.

Post by thegidds » Mon Sep 03, 2012 11:53 pm

Hmmm. I thought it was ok to turn off O2 sensor with a stock exhaust but SAS must be left alone.

I was thinking about doing Kev's throttle mod soon, along with the O2 sensors. Maybe I will hold off until I ditch the stock exhaust

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Re: Home made throttle cam.

Post by kevxtx » Sun Sep 09, 2012 12:03 pm

I run no O2 sensors + SAS connected & cats in my Leovince pipes when I am not mapping.

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Re: Home made throttle cam.

Post by PastaPesto » Sat Feb 15, 2014 9:29 pm

Mine had a metal cam when I opened it up to modify it. Is this a powerpart or original on a 2012 SMT? By the looks of it it is quite like you guys modify it, only it looks better...

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Re: Home made throttle cam.

Post by kevxtx » Sat Feb 15, 2014 10:03 pm

Can't see any photo's to know if it is a power part of aftermarket part.

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Re: Home made throttle cam.

Post by PastaPesto » Sat Feb 15, 2014 10:51 pm

I will make a picture. There was KTM with a number on the cam.

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Re: Home made throttle cam.

Post by PastaPesto » Sun Feb 16, 2014 2:11 pm

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Re: Home made throttle cam.

Post by ztevansmt » Wed Jun 12, 2019 10:49 am

kevxtx wrote:
Fri Jun 03, 2011 10:39 am
I have taken the mod a little further, I have build up the throttle cam with (plastic epoxy that sets rock hard) from where the cable comes out the drilled groove that I made & raised the level by 1mm all the way past full throttle point, this has made the power come on quicker after half throttle.

Now I am happy, easy throttle control low down & the power feels like it comes on quicker after half throttle.
quick question, even though this is an older topic.

Did you raise it untill the return cable?
Or only raise the pick up from the pulling cable and stop where it stops touching the throttle tube?

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