smokinjoe73

So I have been jabbering about doing this for some time but finally did it & was laughing my butt off on the test ride.

I modded the throttle tube to be a quick turn for almost free.

It now feels like someone pimped my ride with a bigbore motor! It is WAY more HP at any given throttle position.

I always noticed this same thing when I swapped over on my racebikes but you notice it so much more on the street.

Here is how I did it, except in order to NOT make it permanent (so I could try different ramps) I drilled and threaded a screw to hold the ramp on.

Making your own quick turn throttle (WR250R) - ADVrider

I dare anyone to do this mod and just try to not laugh hystericly as you take off like its got nitrous. Makes wheelies way more controlable too.

jscobey

ahhh i like free mods. i bought on HRC racing throttle tube for an RC51 off a guy in japan from the speedzilla forums for $25.

it definitely shortened the turn (supposedly it is a 1/6th tube) but i double stacked 2 pieces of zip ties and glued those around the diameter of the tube for even quicker action. now its pretty short.

it is pretty great how awesome a short turn is. for me it had no drawbacks what so ever in terms of jerkiness or anything. i was immediately use to it.

id actually like something more aggressive. if no throttle at all on the stock tube was at 12 O'clock, then i think WOT was prolly around 7 O'clock. with the HRC tube, if no throttle is 12 O'clock, then WOT was 9 O'clock. with my double zip strip mod WOT is now 10 O'clock. id like to get WOT at 11 O'clock. it prolly seems to excessive but i ride with my bars swooped pretty far back and it makes it really uncomfortable to get to full open.

i tried swooping my bars forward more which made my throttle seem WAY shorter because much less effort was required to get to WOT, but i didnt like the way my inputs on the bars translated to the flicking of the bike. yes you have more mechanical advantage with wider more straight out bars, therefore needing less effort to get the bike to turn in at speeds, but it was exactly that mechanical advantage that i didnt like. made things feel "squirmy"

but i digress...

sailorjerry

That's a good idea! Nice mod Joe.


I also have the HRC throttle on mine as well, and I will say for the track I wouldn't mind a little less turn, but for cruising around town like I am most of the time the 1/6 turn is perfect.


I will say though that my fuel economy may have taken a drastic decrease for the first week when I found all this "hidden" power.


Definitely made wheelies easier to control, the throttle inputs with the shorter turn make it almost like as soon as you think about moving your wrist its already done. That goes for up shifts, down shifts, entering and exiting corners.




IMHO this is probably in the top 5 of my favorite mods that I have installed to date.

smokinjoe73

What I found while sanding the pvc ramp was that neutral throttle (cruising or some accel) doesn't even get onto the ramp yet, only when you get on it does it turn into pannigale(ish).

Yeah like I said for a my racebikes I would only trust a dedicated quick turn but this is awesome.

NZSpokes

I did this a couple of weekends ago. But i want more. So am getting a dremel to open up the body so I can glue more on.

Bwhahahaha

thedeatons

Can anyone provide the HRC throttle tube part number?


Thanks!
James

smokinjoe73

So NZ, you are going stage 2, I am not ready for that much HP yet.

pchrist

do you have pics of how it finished up? Interested in doing this!!! Seems simple enough. Could probably find a scrap piece of pipe here at work too. it seemed that the throttle was left open after the mod?

sailorjerry

Get on speedzilla forum and look up simonkobe, he sells the HRC throttle tubes for $30 shipped. That was the cheapest I could find.

sailorjerry

+1

I still ride my bike on the street so any less turn would just get annoying.

7moore7

I'm skipping the ramp and making a 90 degree corner. Instant power!

But this looks pretty cool, I'm on the train to try it once I get a free momement.

pchrist

I'm all in if the finish is clean! Would love to see some pics and the piece that people put in.

smokinjoe73

Pchrist, throttle left open? Maybe you are not ready for this kind of performance increase. LOL

I will open it and snap some pics today.

pchrist

No I meant that in the pic on the other forum it looked like the throttle area that the mod was done wasn't sealed back up? Is that not a concern? If I seen what it looks like on our bikes then I am definitely up for doing it. Especially if it is pretty much free!!!

smokinjoe73

Ok so here is what it looks like, THEN.... you put the cover back on the throttle housing, it looks stock, and the fun ensues.

I used PVC so if I glue it I would use epoxy but like I said I may want other "maps" so only screwed it to the throttle.

NOTE: This is with the throttle pushed unrealisticly forward just so you can see the ramp. It does NOT sit like this normally.

pchrist

Smokin thank you for the pic!!!!!!

so it's all hidden under the cover that seems ridiculously easy!!! What diameter pipe did you use. I work at a plumbing supply house. I will see if we have any "damaged" pipes I could sneak a piece off of. Then you just file down the one side to create the ramp for the cable to pull more as you turn. Seems super easy!

I wasn't sure if in the pic in other forum if this was considered put back together.

smokinjoe73

Thats a totally different throttle, its just for the idea I posted that thread. I used 1 inch inner diameter pvc connetor (I think made to connect two 1 inch OD pipes.)

Forget about that crappy thread, look at my pic. I disassembled the throttle to take it.

pchrist

Ok so then just cut the piece and then start the shaping process?? then screw or glue it down.

smokinjoe73

Yes but if you glue it you may want a diff profile later. (your call). Just be sure to cut it the exact width of the orig piece or it will rub and bind.

You will be shocked at the difference.

Oh, and take off your throttle sleeve & clean & lube it while your in there, and it wouldnt kill you to shoot some lubedown the throttle cables either.

NZSpokes

Yup, I can handle it. Fitting a Red powerband at the same time.

Will fill up my headlight oil too.

twist

please forgive my ignorance, how does this work, what does it do to produce the result? Am I asking the right questions?
It looks like it gives a little more pull to the throttle cables because of the "ramp".

pchrist

It creates an. Oblong shape where it pulls more cable with less turn. Hence why the shaping of the insert could be manipulated to create more or less. Good mod looking forward to trying this one out

thedeatons

I got the part number from simonkobe's ebay listing: 53141-mt7-000. Called my local honda shop and they ordered it for me, the 1/6th turn HRC throttle tube, for $21.77!

Thanks!
James

jscobey

It makes a much shorter turn of the throttle to get to full throttle. It adds at least 20 bhp. Plus I filled my tires with helium to get maximum lightness. I float over the road now.

thedeatons

That's because it's a sportbike...

twist

smokinjoe73

It basicly makes it more horsepower for any given throttle position, so it feels like riding a much faster bike.

Just awesome.

And its ironic that someone with the name twist asked that question.

twist

your modification is clever!

pchrist

That's pretty cheap going to check my honda store tomorrow. Seems like this would be a easy install too?

7moore7

Eff that then. How the hell do I get the throttle position to like 1/2 turn or full turn?! Grind away at the ramp? Add some in line mini block and tackle pullies for ultimate smooth throttle transition? I need this thing to float down the roadway like a tempurpedic blimp.