Quick Pull Throttle

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vmxwinn
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Location: Danville CA

Quick Pull Throttle

#1 Post by vmxwinn » Sun Mar 16, 2014 4:13 am

I would like to change my stock throttle to a quicker pull. Currently I am running PWK 28mm's with a single cable. Anyone modded the stock throttle barrel to a quick pull? Please give details, thanks.
85 Y/B, Toomey pipes, PWK 28's, JJH Needle #2, 45 pilot jet, 145 main, Pods, VForce 4 reed blocks, +3 ignition, Milled head 1.1mm squish, R6 Shock, Progressive

Many Vintage MX Bikes, 03 ZRX1200R, 86 Moto Guzzi 1000 Le Mans MK IV, 86 VFR 750, 74 GT 550
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aaronmvrider
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Re: Quick Pull Throttle

#2 Post by aaronmvrider » Sun Mar 16, 2014 5:13 am

i have looked into this.. and decided on a domino quick action throttle dual line... 1/4 turn offers 36mm carb slide travel... from memory

i have 39 mm carbs... might be too aggressive for standard carbs ???? for road use...
1 x 4mm stroker rz 375cc 1983
1 x 7mm stroker rz 443cc 1984 (under construction)
1 x rz 500
1 x mv agusta 1000
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kpke
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Re: Quick Pull Throttle

#3 Post by kpke » Sun Mar 16, 2014 9:52 am

vmx, I have a quick turn on the bike below. It is a purchased assembly. I love it. The factory kill switch had to be removed and after market one installed. I am sure I have seen a mod for the stock tube tho. Did you google it?

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aaronmvrider
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Re: Quick Pull Throttle

#4 Post by aaronmvrider » Sun Mar 16, 2014 5:25 pm

there is a mod which involves wrapping/ ramping the cable guide on throttle tube but i still think it will be a long pull to get the 28 mm slides to full

you will also need to have some work done to the cable splitter housing as it wont allow full throttle... housing too short...

i guess it depend on what carbs you have.. ???
1 x 4mm stroker rz 375cc 1983
1 x 7mm stroker rz 443cc 1984 (under construction)
1 x rz 500
1 x mv agusta 1000
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vmxwinn
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Location: Danville CA

Re: Quick Pull Throttle

#5 Post by vmxwinn » Mon Mar 17, 2014 1:03 am

aaronmvrider wrote:there is a mod which involves wrapping/ ramping the cable guide on throttle tube but i still think it will be a long pull to get the 28 mm slides to full

This is what I want to do. Make the throttle tube cable guide a larger diameter which should quicken the pull. There are many different profile throttle tubes made for dirt bikes so the same idea just home made.

you will also need to have some work done to the cable splitter housing as it wont allow full throttle... housing too short...

If I twist the throttle all the way and look at the slides they are fully open

i guess it depend on what carbs you have.. ???
PWK 28's
85 Y/B, Toomey pipes, PWK 28's, JJH Needle #2, 45 pilot jet, 145 main, Pods, VForce 4 reed blocks, +3 ignition, Milled head 1.1mm squish, R6 Shock, Progressive

Many Vintage MX Bikes, 03 ZRX1200R, 86 Moto Guzzi 1000 Le Mans MK IV, 86 VFR 750, 74 GT 550
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South_Oz
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Re: Quick Pull Throttle

#6 Post by South_Oz » Mon Mar 17, 2014 3:55 am

Not sure where I got these pics from (another forum) but looks like a good idea.

Image

Image

Dave
RZ 250 85 (Waiting)
RZ 250 85 (Parts)
RGV VJ21 250, Australian Speed Record Holder, MPS/G 250, 140.5 MPH
BMW R1100S 99 (Its Red)
BMW R1200GS (Its BIG)


http://www.dlra.org.au/index.htm" onclick="window.open(this.href);return false;
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hondaror
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Re: Quick Pull Throttle

#7 Post by hondaror » Mon Mar 17, 2014 4:07 am

That's rather brilliant!
Rory
2 1984 RZ350s
1985 RZ350
9 1986-1990 RZ350s
2000 ST2
2005 749
2005 749 with 999 engine
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aaronmvrider
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Re: Quick Pull Throttle

#8 Post by aaronmvrider » Mon Mar 17, 2014 4:11 am

i mean originals...
1 x 4mm stroker rz 375cc 1983
1 x 7mm stroker rz 443cc 1984 (under construction)
1 x rz 500
1 x mv agusta 1000
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aaronmvrider
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Re: Quick Pull Throttle

#9 Post by aaronmvrider » Mon Mar 17, 2014 4:13 am

thats the info i was trying to explain... but if you have a cable splitter it will limit the amount of cable travel not allowing full throttle... as said it depends on what the original setup is...
1 x 4mm stroker rz 375cc 1983
1 x 7mm stroker rz 443cc 1984 (under construction)
1 x rz 500
1 x mv agusta 1000
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nokturnal
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Re: Quick Pull Throttle

#10 Post by nokturnal » Mon Mar 17, 2014 7:27 am

I have an R1 throttle tube from amy recent track gsxr part out... it changed the gix from 1/4 to 1/5... I wonder how it fits on the RZ.

I am going to try it... it even has the same grip!
:smt017
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two-stroke-brit
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Re: Quick Pull Throttle

#11 Post by two-stroke-brit » Mon Mar 17, 2014 1:46 pm

South_Oz wrote:Not sure where I got these pics from (another forum) but looks like a good idea.

Image

Image

Dave
thats neat. :smt038
350LC,Athena 392 big bore,stock porting,swiss cheese air box,stock reeds,spec11 pipes.(now TSA big bore pipes)
She might not be pretty but she will always be a fun ride


1982 YAMA RD350LC
98KDX 220R
1967 TRIUMPH TIGER
2001 TRIUMPH TT600
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pearljam724
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Re: Quick Pull Throttle

#12 Post by pearljam724 » Mon Mar 17, 2014 2:27 pm

You can perform the same mod only using a zip tie. Takes seconds to install and cost about 5 cents.
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two-stroke-brit
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Re: Quick Pull Throttle

#13 Post by two-stroke-brit » Mon Mar 17, 2014 6:17 pm

^^^not as cool tho
350LC,Athena 392 big bore,stock porting,swiss cheese air box,stock reeds,spec11 pipes.(now TSA big bore pipes)
She might not be pretty but she will always be a fun ride


1982 YAMA RD350LC
98KDX 220R
1967 TRIUMPH TIGER
2001 TRIUMPH TT600
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South_Oz
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Re: Quick Pull Throttle

#14 Post by South_Oz » Mon Mar 17, 2014 7:25 pm

I thought that was what you were on about Aaron, jogged my memory about these pics from a few years ago.

The black ring was part of some high pressure plastic pipe cut to suit.

Dave

South_Oz wrote:Not sure where I got these pics from (another forum) but looks like a good idea.

Image

Image

Dave
RZ 250 85 (Waiting)
RZ 250 85 (Parts)
RGV VJ21 250, Australian Speed Record Holder, MPS/G 250, 140.5 MPH
BMW R1100S 99 (Its Red)
BMW R1200GS (Its BIG)


http://www.dlra.org.au/index.htm" onclick="window.open(this.href);return false;
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tankslap
Posts: 235
Joined: Sun Oct 17, 2010 6:36 am
Location: cairns australia

Re: Quick Pull Throttle

#15 Post by tankslap » Wed Apr 16, 2014 6:28 am

Not a RZ but I fitted a 36mm Keihin to my Aprilia 125 and changed
the throttle assembly at the same time. The throttle ended up
so heavy that I went in search of a long pull throttle assembly
so that the twist grip pull was light enough to use.

Is this a common problem when going to a quick action throttle or is it
possible I have an issue elsewhere.
The quick action throttle has less leverage over the return spring so is this just
one of the trade offs with fitting a quick action?
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