New 450 is turning out to be a bargain purchase but the throttle is very spikey in the slower sections. I achieved total lift-off on the rideout with Wheely yesterday.
I have seen the G2 throttle tamer. Looks like it does a good job.
Key question- what is your reaction to the throttle tamer- is it worth the £80 quid or so. Also has anyone tried re-profiling the cam in the standard throttle to achieve a similar result.
A few views but not too many comments (zero) so I am going to have a go at modifying the twist grip . The grip currently turns through just 75 degrees from closed to full open- thats not even a quarter turn- great for the track but tough to control in the woods.
The diameter of the surface that pulls the throttle cable is 36.5mm so using elementary maths dear watson 75/360(proportion of circle) x 3.142(pie)x 36.5(Diameter)= 23.9mm which is the length of the throttle cable drawn
I can reduce the diameter of the surface that pulls the throttle cabe to 27.5 mm. so 1 full turn of the throttle would draw 27.5 x 3.142 = 86.4mm
I only need to pull 23.9mm which means that the tthrottle will turn 23.9mm/ 86.4mm x 360degrees= 99 degrees- nearly a third more than now. so it should be softer In Short Im going to cut some bits off and see if it makes it any better . Ill post a picture when its done (if it works). Otherwise iI will go into hiding. cheers
After coming off a XR to a 450 KTM engined Beta is going to take some adjustment by any standard.
One thing to bear in mind is the amount of movement required by your wrist and this may get uncomfortable after a while making you drop you elbows a lot. Top riders use accentuated cams for this very reason so it makes it easier to ride with your elbows up!
Still it's worth giving it a go, so long as you can get hold of an original throttle tube.
I am planning to profile the twist grip like a cam. This will tame the effect for the first few degrees of twist and maintain the current level for the rest.
Should keep my elbows good and high
At the moment the cable drawing surface is just flat, a smoot groove will help centre the cable and improve matters hopefully.
I modified my 450 and now 400 just as you plan to and it works a treat. Just deepened the opening cable groove from the base of the nipple hole to just beyond the end of the side flanges. This gives a slow initial throttle action which quickens the more the throttle is opened. The G2 does a does a similar thing in varying degrees dependent on the Cam used, nice bit of kit but very expensive. Hope this helps, Cheers, Neil.
wot they means is.... basically the twist grip diameter is large in circumference and a smaller circumference is required, so that the amount of "twist "reqired to open the throttle from closed to full bore is larger, giving more controll over throttle openings.
Dont think "profileing the twist grip cam will make a lot of difference It's all in the "wrist action"... as they say!!!
Similar to the on/off switch problems that the KTM scrambler I had + 2 stroke minimalistic power band and fast throttle... ideal for track racing but not much good for our sport!!!!
Mike, as you know I have a G2 throttle cam on my 450 EXC and am using the middle of the three cams provided. ( I believe the number 100 is the same as standard) I am very pleased with it and think it makes a real difference on the technical stuff. Expensive yes but very well made, its a pity its hidden! For anyone not following do a google for G2. A LOT of people have fitted them to fuel injected KTM's to take out the 'snatch' in the fueling at low speeds. So succsessful was the cure KTM now sell them as a KTM Hardpart.
-- Edited by Landyman on Tuesday 6th of October 2009 06:04:51 PM
Similar to the on/off switch problems that the KTM scrambler I had + 2 stroke minimalistic power band and fast throttle... ideal for track racing but not much good for our sport!!!!
I so wish I had had a go!!! as Rossi said GO!!!!!!!!!!!!!!!!!!!!
It was an initial conversation with Landy that started this. He was obviously well in control of his 450- unlike me. and the G2 looks like a superb piece of kit.
I have deep pockets and short arms (yorkshire blood tha knows) and was looking for a more economical fix. Chris made a good point about not overdooing it and Neil has already done it .
So yer tiz
and here
All this fuss over such a little cut as gran would say. You can see the groove cut into the twistgrip surface. This was cut sanded and finished with some 800 wet and dry and a bit of wd40 to make it smooth. This effectively reduces its circumference of the first part of the twist but maintains the normal circumference for the rest.
On the bike it gives 11 degrees more turn. Doesnt sound much but if- as planned-most of this change is at the start- it should give -as Neil puts it- a slow initial action which quickens later (obviously a man of considerable experience )
OK, here's my two-penneth worth... The G2 throttle tamer (I've just ordered mine from the US of A for the SM-T) has several profiled cams instead of just a round tube.
If you look at the attached drawing you will see that the throttle cable nipple is attached at point A and normally goes around the cam in a clockwise direction following the Blue outer line. When you re-profile the cam and shave off the bit between the blue circle and the red line it has a reduction in diameter and therefore doesn't open the throttle as quickly. The distance between 'A' and 'B' is shorter on the red route! The advantage is that you get a more controlled opening (not so much snatch) and you still get a real handful where it matters in mid-range. If you order direct from G2 in the US of A you can just order the 'Throttle Tamer' version without all three cams. I ordered mine yesterday and it cost £72.03 inc fast delivery. I had an e-mail this morning from UPS saying it was on it's way. I used one on the RC8 and it was fabulous in smoothing out the fuel injection at low throttle openings.
I did as Mike shows on the RC8 at first but it allowed the reinforcing around the nipple hole to become too flexible and the throttle would rotate forward when it shouldn't have done as the plastic distorted. Not so bad on a trail bike but not good on an RC8!
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I do know where I'm going, but the track it will decide, It's not the destination, It's the glory of the ride!
Hope I havent Bu**ered it up then. I didnt cut where the cable nipple fits- that should be pretty much as it was- I just flattened the route of the cable after that.
I have tried double sided tape and impact glue, but the grips still rotate on the bars / throttle
any suggestions?
and the drum rear brake on the CRF... not very good on unmetalled surfaces.........................! either has a minor slowing action or locks the rear wheel!!
Similar to the on/off switch problems that the KTM scrambler I had + 2 stroke minimalistic power band and fast throttle... ideal for track racing but not much good for our sport!!!!
I so wish I had had a go!!! as Rossi said GO!!!!!!!!!!!!!!!!!!!!
As in Valentino?
Want one of these for "laneing" !!!
but at a tad over £1/2K maybe not
will have to continue to look like "Lawnmower / Strimmer Man!!"
First short run up the road with the "tamed throttle"- Now smoother than a smooth thing.
Managed to bimble along at a very slow pace and speed up nice and gently. Still plenty of ooomph when you want it but a nice bit of extra control at slow speed.
My G2 throttle tamer arrived today from the US of A after ordering it on 6th - 3 days from Rock Falls, Illinois! i fitted this afternoon and it is much smoother than the original plastic job from KTM.
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I do know where I'm going, but the track it will decide, It's not the destination, It's the glory of the ride!
but the throttle is very spikey in the slower sections
. I achieved total lift-off on the rideout with Wheely yesterday.
