Throttle resistance / control

[Duster]

OK, so one thing I find that "I" and every person I let ride my KFX loves and also hates is the throttle.

Love how spunky it is, how instant the throttle response is, and how easy the thumb lever is.

But hate how easy/quick the throttle is when the going is a little rough or choppy.

Everyone I let ride it is surprised by it, but every one of them would rather give up the EFI response and keep their sluggish carb and easier throttle control.



Has anyone had all the throttle stuff apart or replaced it with aftermarket stuff?

I'm just wondering "where" the resistance/return spring or whatever is...

And I'm wondering if it is possible to change out to a little stiffer spring or a little slower throttle cam setup???


The reason I am bringing it up is I've ridden the same new area twice this week, and nearly 'throttle crashed' in the same few places both times... and actually a few more new places this second time since I went back with my stock-mod intake.... I think because I was having to pull a gear lower than before in more places which amplifies an accidental blip a little bit more.

And I think thumb fatigue from trying to hold as steady as possible is just as tiring as having to hold a stiff throttle.

[skitzo433]

Two ways too cure this:

1: Change your gearing.
I run 15/36 with 20" tires for XC woods and 22" tires when I get to the desert. These bikes aren't that quick and deffinately not fast, compared to what I'm used to! Oh and first gear is very seldom used in the woods.

2: Learn to ride! Smooth is fast! Blaming the throttle response for herky jerky riding is like saying guns kill people. There is a lever that your left fingers control called a clutch lever. This lever engages/disengages our clutch packs. By using this lever an operator can put a variable amout of power to the ground.

Hopefully this helps.

[kfx450r#490]

thats going to piss him right off!

[kfx450r#490]

duster have you ever though about switching to a twist throtle? ive never heard or even though about that, so im kinda confused. i know what its like to ride rocky terain and still no clue where your coming from. the more i think about it though mabe its time you you to invest in a stabilizer?

[Duster]

Well yeah, I need a stabilizer and shocks... but there's more to it than that.

See, you guys really don't know what throttle response is yet.
And I don't mean that in a smug way, but rather as a matter of fact.
I'm running several degrees of timing advance and so forth...
My throttle response is lightning quick.

This is why you don't understand I think.

It's pretty jumpy, and a small accidental throttle blip can land you in big trouble in some of the places I ride... like climbing one of the two trees you were supposed to go between, or missing the switchback turn straight in the bushes...

I think a little stronger spring would go a long way the more I think about it.



I agree (in some cases) a gearing change does help some... as does enough extra power to run a gear or two higher than before. When I'm running fully modded out it still happens, but doesn't lunge as hard under heavier load. But in lower load situations (other cases) where it can pull it the gearing makes it worse/faster.

Around here I think you'd have to have 60hp or a Rekluse to run 15/36 gearing.
We really don't need that either because there is nowhere open enough to get that fast.
I run 15/38 a lot and that seems like plenty of gear.

[skitzo433]

How many degree's advanced are you I'm at 4 right now? Just curious

[fastjunkie131]

there is a spring at the throttle body end under the black cover where the cable enters. nothing you can do with that. i here that older carb equipped yamaha 450s had stiffer thumb throttles and a lot of people switched them over to honda thumb throttles so that may be a idea.me i like my twist

[Duster]

Quote: Originally Posted by fastjunkie131

there is a spring at the throttle body end under the black cover where the cable enters. nothing you can do with that. i here that older carb equipped yamaha 450s had stiffer thumb throttles and a lot of people switched them over to honda thumb throttles so that may be a idea.me i like my twist

Thanks...

I have a honda so I can open and disconnect both to compare.

The YFZ was really stiff... too stiff.
I kind of have the opposite effect with the KFX.
The effort is to hold-off and steady on the KFX.

[Duster]

Quote: Originally Posted by skitzo433

How many degree's advanced are you I'm at 4 right now? Just curious

I keep playing with it on both logics...
I've been from -4 to +6 on both of them so far.

I'm still in the learning process and have both timing vs RPM and timing vs TPS to adjust, and learning on just how they interact with each other.

So far I have found that it is not so much in how much advance over stock you actually run, but how you bring on the curves that affects response and acceleration. This is dirt learning. Then on the dyno I will be able to figure out how adjustment affects max power and how it affects the power curve.

I am thinking that probably somewhere around +4 is going to yield the most peak power on some builds, while others will sail higher with more advance... while other builds will be more limited in how much advance they can actually stand before it causes loss and detonation.

[fastjunkie131]

walsh and myself were changing the timing and found that 6 degrees advanced worked best for me. any more and the power dropped off fast. we went all the way to 30 degrees advanced and everything in between and 6 degrees advanced at 5500 rpm is where its at.