Replacement Throttle Tube

RetroRacer

RetroRacer

Junior member
Location
London
Any ideas where I can get a throttle tube replacement that doesn't cost crazy money and fits OEM switchgear?

Mine is all mangled.
 

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You can adapt many throttle tubes - a bit of grinding and filing may be necessary. I used a Japanese MX barrel (Kawasaki KX250 I think) and ground it down and drilled a new cable nipple hole so it had a rising rate, ie normal operation at low throttle settings and lifting the slides more quickly as the twist progressed. Fitted into the std ND housing. Combined with lighter carb springs it worked really well.
 
They sell kits where there are different shaped cams that vary that affect Q, they also sell bilt-knurled alloy tubes with integrated bearings if you're really keen.
 
piranha-bro2 said:
You can adapt many throttle tubes - a bit of grinding and filing may be necessary. I used a Japanese MX barrel (Kawasaki KX250 I think) and ground it down and drilled a new cable nipple hole so it had a rising rate, ie normal operation at low throttle settings and lifting the slides more quickly as the twist progressed. Fitted into the std ND housing. Combined with lighter carb springs it worked really well.
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Thanks so much!
 
No, why. They make those Generic Throttle housing cam kits for all kinds of bikes as an accessory, especially for powerful race bikes to vary the way your power can be applied. If it isn't helpful then ignore it.
www.g2ergo.com

Shop | G2 Ergonomics

Shop | G2 Ergonomics
www.g2ergo.com www.g2ergo.com
 
Retro
If you go down the Suzuki route be aware that for example the GT380 will not have starter button but a GT550 will although the switch units look the same.
 
Paddy said:
Retro
If you go down the Suzuki route be aware that for example the GT380 will not have starter button but a GT550 will although the switch units look the same.
Click to expand...
Thanks Paddy, I’ve been looking at the GTs as well, since I know some share the controls.
 
Paddy said:
That is a fly by wire Panigale V4 throttle at about £450 ? Thats not going to work with any Laverda
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The first one is, but if you scroll down they make dozens of kits for all kinds of bikes. Yes, there are no specific Laverda ones but there never are. You can adapt one with 3 or 4 various cam shapes you can swap into its housing that changes the ramp for the throttle cable just like Q did, they allow a slow or fast progression to tame aggressive acceleration. One of the local Oz race engineers, Phil Talon who ran the Suzuki race program in oz offered the same service by glueing bits to the plastic tube where the cable ran, I got that done to make my 3c throttle into almost a 1/4 turn when it ran Dels. Great easy mod.
 
RetroRacer said:
Any ideas where I can get a throttle tube replacement that doesn't cost crazy money and fits OEM switchgear?

Mine is all mangled.
Click to expand...
In fact, there doesn't seem to be anything wrong with yours. I often grind that last "ring" off since it doesn't allow me to fit the grips I like.
They can be replaced with a "washer" that stop's the grip rubbing on the switch block.

Paul
 
Paddy said:
Retro
If you go down the Suzuki route be aware that for example the GT380 will not have starter button but a GT550 will although the switch units look the same.
Click to expand...
Suzuki GT 750 is a straight fit. Some even use a twin cable push pull setup than can be useful for some carbs.
Paul
 
All that takes is a bigger diameter where the cable runs, obviously it still needs to fit inside the cover but there is usually plenty of room to go a bit bigger and it's really helpful, std is maybe 2 rotations to full throttle. I remember Batto's race bike had one that was humungous, maybe 100mm in diameter.
 
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