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View Full Version : Stiff Thumb Throttle???



BUCK442
02-26-2004, 07:26 PM
I hear that some of the Top Dawgs are making a mod to the throttle and making it easier without replacing the stock housing.

Anyone know how to make it easier. Thanks!:cool:

Quad18star
02-26-2004, 08:29 PM
I hear lots of people saying the stock thumb throttle is stiff , but I dont seem to have any problems with mine . I thought it was one of the lightest on the market .... guess I was wrong . :confused:

BUCK442
02-26-2004, 09:55 PM
What did you ride before a Quadzilla??? Or do you just work out?:p

jlhughes750
02-26-2004, 10:30 PM
My YFZ throttle is not too bad but I have felt some that need work. I see alot of people using the EX set up. Its not that expensive, and there easy to find.

psd1
02-26-2004, 11:38 PM
Jump on a Shee for a weekend...:(

Davids440ex
02-27-2004, 01:11 AM
i am running my honda throttle body, the stock one os just to hard to hold in on a rough track, i havnt had enough time yet to pull my carb and look at the spring, once i do i will probley shave some off to make it easier

Hammer trx450r
02-27-2004, 03:34 AM
we used to shave the banshees springs too but look out for the fcr it needs big springs or your TORS will start working

EvilJester400EX
02-27-2004, 01:36 PM
My thumb would cramp really bad on my YFZ after only a few laps on the mx track. After doing some research, I decided to try out the Cascade Innovations thumb throttle (banshee/blaster model). Works like a charm! I was able to ride Birch Creek for a long time without even stopping because of my thumb. For 35 dollars, you can't beat it.

seatec
02-27-2004, 02:09 PM
i tried the cascade and because its longer than stock you have more leveareg and thus easier pull however, if you have bigger hands you scrape the bottom of you knuckles. usesless to large hands. bummer cause i really liked it.

660bigdaddy
02-28-2004, 07:13 AM
I hear that some of the Top Dawgs are making a mod to the throttle and making it easier without replacing the stock housing.
talked to east coast atv about this issue, and they suggested trimming up the return spring in the throttle housing to make it easier to pull.

BUCK442
02-28-2004, 11:23 PM
Thanks.

Hammer trx450r
02-29-2004, 06:20 AM
after you shave it stretch it alittle so it fully seats. DONT take tooo much off at one time

660bigdaddy
02-29-2004, 06:53 AM
this weekend i took the cover off and lossed the nut on the top of the assemble and moved the thumb in a little bit to decrease the reach. i think for me the cramping is coming from reaching back so far to pull the throttle. if you do this, make sure the slide on the carb is opening up all the way.
i went out and rode w/ it and it seemed to help a lot. jmo

Aussiequadrider
02-29-2004, 11:26 AM
To anyone that gets thumb pump try putting a thick rubber band or two around your thumb and and hold the other end with your other hand.
Place both hands down say on your desk in front of the computer and separate your hands enough to put some resistance on your thumb as you simulate the throttle.
Do reps of over 20, while your reading stuff of the computer.

Geoff.

Davids440ex
02-29-2004, 09:50 PM
i think the honda throttle body helps alot i practice alot this weekend and it didnt cramp or nothing.

chad cavagnaro
03-01-2004, 11:45 AM
i think the problem is not in the thumb throttle but in the carb, if you take and remove the cable from inside the
throttle housing, then press the thumb lever it is then very easy wich tells me it is in the carb! i dont know what to do in the carb to fix it and dont want to mess with the expensive parts in there so im trying to order motion pro twist, although would rather have thumb that is feather light.:confused:

BUCK442
03-02-2004, 08:09 PM
I guess some of the GNCC'rs are not releasing the info huh?:(

Hush Hush.

Wingnut
03-03-2004, 07:27 AM
Originally posted by BUCK442
I guess some of the GNCC'rs are not releasing the info huh?:(

Hush Hush.

:devil:

Bean
03-03-2004, 03:42 PM
well, if you pulled the cable out the carb, that would be why it is so easy, duh, lol


i had a warrior throttle on my bars, it worked good till i broke it at the ajustment screw from overtightening it, now i just a fully lubed stock R one, works fine with my 38mm carb

chad cavagnaro
03-03-2004, 05:08 PM
Originally posted by Bean
well, if you pulled the cable out the carb, that would be why it is so easy, duh, lol


i had a warrior throttle on my bars, it worked good till i broke it at the ajustment screw from overtightening it, now i just a fully lubed stock R one, works fine with my 38mm carb


didnt say anything about pulling cable out of the carb, i said
"throttle housing" pay attention... lol. everybody is tryng to replace the thumb throttle with another when the throttle is not stiff the spring in the carb is stiff!!!!

Wingnut
03-03-2004, 06:28 PM
Yes, the spring in the carb is stiff. What the Honda throttle does is give the throttle a shorter throw. You won't have to reach as far for it or push it as far. It also makes the engine feel more responsive. The slightly longer arm in the Honda throttle means that it actually takes a little more effort to push it, but the benefit of the shorter throw out weighs that in my opinion.

BUCK442
03-03-2004, 08:21 PM
Originally posted by Wingnut
:devil:

I am going to find that joker riding that #216 and park right next to him on the start and check his throttle!;)

Just got the news from the Dr this morning not 1 but 2 kidney stones are on their wayout! I am still racing GA though! :mad:
Stone or no stone!

See ya'll there!

660bigdaddy
03-07-2004, 06:54 AM
hate to say it, but my throttle kicked my butt this weekend in georgia. after pulling the holeshot and looking at a possible good finish, i couldn't push the thumb thingy any more. i spent 75 % of the time pulling w/ my fingers over the bar, which caused me to sprain my thumb. also my wrist and back of my hand is swollen. heard you have to trim the return spring. only way to make it easier. i guess i'll be working on that this week.
anyone suggest how many coils to trim?
thanks:D

Hammer trx450r
03-07-2004, 07:19 AM
welcome to Yamaha!! I've delt with my banshee for yrs

Out_Sider
03-07-2004, 07:23 AM
thats why i like a twister :o

EvilJester400EX
03-07-2004, 03:16 PM
I would not trim the spring inside the carbeurator. I've heard this can cause your throttle to stick open.

cjpoole1
03-07-2004, 06:26 PM
Originally posted by 660bigdaddy
heard you have to trim the return spring. only way to make it easier. i guess i'll be working on that this week.
anyone suggest how many coils to trim?
thanks:D
If your talking about the spring in the thumb throttle, I took mine completely out about 4 months ago and could tell a little difference and haven't had any problems out of it.

Davids440ex
03-07-2004, 07:35 PM
if you put a nohda throttle body on it it makes it so much easier, the angle of the yamaha sucks, i have been riding every single day sence monday and my thumb hasnt gotten sore at all.

cjpoole1
03-07-2004, 07:41 PM
Originally posted by Davids440ex
if you put a nohda throttle body on it it makes it so much easier, the angle of the yamaha sucks, i have been riding every single day sence monday and my thumb hasnt gotten sore at all.
Which honda throttle?

Davids440ex
03-07-2004, 07:44 PM
any they are all the same 250r,250ex,300ex,400ex

Wingnut
03-07-2004, 07:54 PM
Originally posted by Davids440ex
any they are all the same 250r,250ex,300ex,400ex

I'm using one off a 1987 Fourtrax 125. It has an adjustable throttle stop!

cjpoole1
03-07-2004, 09:02 PM
Originally posted by Davids440ex
any they are all the same 250r,250ex,300ex,400ex
Not exactly I know a 250R and 300ex are different.

CatMostFeared
03-08-2004, 12:19 AM
Motion Pro Vortex Twist is the way to go.:macho

03-08-2004, 08:40 AM
Thge stock YFZ throttle is not that stiff. The problem that is making everyones thumbs so tired is the angle of the throttle. You can lighten the springs all you want but if you don't have Huge hands you are going to continue to have the problem.

A 400ex throttle will work just fine. The cable will screw right in and it does open the throtle all the way!

Out_Sider
03-08-2004, 08:59 AM
Originally posted by CatMostFeared
Motion Pro Vortex Twist is the way to go.:macho

Dayum Right!!! ;)

Davids440ex
03-08-2004, 04:17 PM
they are all the same basic setup they have differnt shape but the internal parts are the same.




Originally posted by cjpoole1
Not exactly I know a 250R and 300ex are different.

NTPRacing#19
03-08-2004, 04:38 PM
how do you take the spring out? i want to clip it but i have no idea how to take the damn spring out. ive been in my carb many times now and ive tried removing that tiny little silver nut but i can get a grip on it. i doubt thats the way it comes off but it has to come off! i aint riding with a stiff spring.

BUCK442
03-12-2004, 07:37 PM
Ask Wingnut? He knows!;)

Wingnut
03-12-2004, 08:10 PM
The wheel the throttle cable connects to can't be removed from the shaft as far as I know. You have to go to the opposite side of the carb, where the TORS is connected. Remove that cover and you will see the a nut. You have to remove that nut to free up the shaft. Then take the cover off for the top of the slide. You will see where there is a screw that connects the shaft to the slide linkage, remove that screw. At this point, you should be able to pull the wheel and shaft out that covers the spring. Be VERY careful with the spring! I don't think you can get another without buying the whole carb. If anyone trys this and screws something up, don't blame me!

EX 80
03-12-2004, 09:14 PM
Originally posted by GNCCer
Thge stock YFZ throttle is not that stiff. The problem that is making everyones thumbs so tired is the angle of the throttle. You can lighten the springs all you want but if you don't have Huge hands you are going to continue to have the problem.

A 400ex throttle will work just fine. The cable will screw right in and it does open the throtle all the way!

My thoughts exactly. The spring is alittle stiffer than my 400ex with an FCR, not a big deal, I'll just get a stonger thumb. My problem was the angle and where it was. I have a 400ex throttle on my YFZ and wow way better. Just like i am used to on my 400ex.

NTPRacing#19
03-13-2004, 06:18 AM
well then maybe ill get a 400ex throttle body on there.

03-13-2004, 09:13 PM
Ok I am going to sound like an idiot asking this questioin after I have already posted in this forum. But what do you do with the wires that are going into the stock throttle? what are they for? do you need them?

RiPPiNiTuP7
03-14-2004, 08:13 AM
Originally posted by GNCCer
Ok I am going to sound like an idiot asking this questioin after I have already posted in this forum. But what do you do with the wires that are going into the stock throttle? what are they for? do you need them?

those are for the tors system. if you put a new throttle on your yfz all you need to do is connect them together ;)

03-14-2004, 07:09 PM
Thanks rippin!

Pappy
03-29-2004, 07:52 AM
Well i took a spin on a YFZ this weekend equiped with a honda thumb throttle. The real secret to making this switch is using the actual Thumb Lever from a TRX90 on the 400ex throttle housing:eek: Its a 1/2 inch longer and offers just a bit better leverage ration and man does it feel great!!

RiPPiNiTuP7
03-29-2004, 09:34 AM
i got a 400ex throttle the other day, we will see how it does:cool:

cjpoole1
03-29-2004, 10:37 AM
Originally posted by Pappy
Well i took a spin on a YFZ this weekend equiped with a honda thumb throttle. The real secret to making this switch is using the actual Thumb Lever from a TRX90 on the 400ex throttle housing:eek: Its a 1/2 inch longer and offers just a bit better leverage ration and man does it feel great!!
Thanks for the tip pappy

slofords
03-29-2004, 09:05 PM
How much is a 400ex throttle new? Where can I get a new one? I have been searching on ebay, but they all look beat up to me, I want one that looks nice. Is there a place that sells honda parts discounted?

cjpoole1
03-29-2004, 09:38 PM
a little over $50 if you buy all the parts to assemble one off service honda

powerstroke
03-30-2004, 04:57 PM
buck, its olson!!!!! how are ya man??? I am feeling your pain....I love my yfz but the thumb throttle sucks *** bad! anyway drop me a pm sometime. talk to ya later man. Matt (big number 13 in the MHSC! :blah: )

gncc533
03-30-2004, 09:06 PM
i was gonna post this 4 buck but i'll tell u 2 powerstroke PUT A TWIST ON IT you'll be faster.HA HA

powerstroke
03-31-2004, 07:40 PM
would u give that same response to ballance or duvall??:blah: lol

CatMostFeared
04-01-2004, 03:25 AM
Montion Pro Twist:D

gncc533
04-01-2004, 08:36 PM
i was just yankin your chain olson.:D

haydug
04-05-2004, 02:05 PM
Has anyoe tried getting a carb spring from a dirtbike to lesson the pull yet?

04-05-2004, 02:28 PM
Has anyoe tried getting a carb spring from a dirtbike to lesson the pull yet?

this comment is not intended for you doug but everyone!!!

No Matter how soft you make the throttle, the ergonomics is still wrong for MOST people. it does not allow you to keep a firm grasp on the grip and have your thumb in a good position on the throttle. I agree softing it up is a good idea. but I think most people will still more comfotable with a different throttle. jmo

haydug
04-05-2004, 02:49 PM
Well, I just put a Honda throttle on mine, but haven't ridden with it yet. I rode this weekend for the first time with the stocker, and let me say it SUCKED. My arm pumped up so bad, and my thumb slipped off on a big double causing me to case pretty hard. I am going to try the bike spring as well, it was only a couple bucks, so couldn't hurt anything, along with the honda thumb. I'll let you know how it works out.

04-05-2004, 02:55 PM
i think to do both would make it real nice. doug if you have the time try it without the spring first and then try it with the softer spring. I am eager to see how that affects it. you wouldn't be able to tell us how much the springs alone helps if you do them both at the same time.

jlhughes750
04-07-2004, 12:57 PM
the Honda housing alone was well worth the switch.

What a difference it made. This week i'm going to try a trx90 lever or a 200X lever.

powerstroke
04-08-2004, 08:59 PM
gncc533--i know you were kiddin bro :D anyway i took my carb apart and trimmed the slide return spring waaaay down. I pretty much cut it in half. After that modification I have had no trouble with "thumb pump" even with the OEM yamaha thumb throttle. I will probably switch to a honda thumb eventually just because the ergonomics on it is a tad better however the stiff return spring is the main problem. Matt

skrib21
04-08-2004, 09:36 PM
Dont bother messing with your spring just buy the 400ex thumb throttle I bought one after messing with every thing I could on the stocker . Trust me the best money Ive ever spent. I feel 199% better riding no sore thumb, even after 5 days of riding in the dunes last week. If i sold these I would put a 150% money back guarantee on this fix!!!!!!!!!!!!!!!!!!!!!!!!!:D :D :D :D :D :D :confused: :D

powerstroke
04-09-2004, 10:32 PM
I agree the honda thumb throttle is a bit more ergonomically comfortable however switching to the honda unit alone does NOTHING to reduce the amount of pressure it takes to hold the throttle open. We put a honda thumb throttle on a friends bike without trimming the spring and it was about 10% more comfortable to ride. we trimmed the spring on my bike and used the stock yamaha thumb throttle and it 90% more comfortable to ride. Switching to the honda thumb throttle is a good switch but if you really want a good comfortable thumb throttle then cutting the slide return spring in the carb down is really where its at. if you want the ultimate do the spring and the honda thumb throttle... just my 2 cents. Matt;) ;)

BUCK442
04-14-2004, 09:29 AM
Matt you going to Lorettas?

I checked out your handy work on D's bike and it did feel better, maybee you can work on mine! Everyone else has....

:devil:

powerstroke
04-14-2004, 01:41 PM
whats up buck!!!!!!! not too much here. Yes me and gaylon are leaving for lorettas friday morning. dave parton is the one who told us how to trim that spring down. it makes a big difference. Me and dave both worked on em but dave did most of the internal carb stuff while i was fixing other crap. Dave is also coming down friday night. Im sure we can get a look at yours somewhere along the line. Cya down there. Matt

Imapro
04-19-2004, 02:19 PM
ok question.

The 400ex throttle will fit the YFZ...sodoes that mean the YFZ throttle will fit the 400ex?

I HATE the YFZ ergonomics- IF they are interchangeable I can switch my throttle with my fathers 400 and he wont care.

Anyone know before I get my bike all set up and then my father can ride his?

powerstroke
04-23-2004, 10:22 PM
yes they are interchangeable