Q/A Twist Grip

Don't know what will fit, but be sure to buy a wrist trainer at the same time. :D

Stock throttle action is already on the heavy side, using a quick-action spool makes it bloody heavy!

Most triple owners that fit these things throw them away after a couple of months...

piet
 
Probably can, many 70s and 80s Suzukis used the same switch clusters as Laverda.  Don't know what you want a second throttle cable for, no provision for one on the stock carbs.

piet
 
sfcpiet said:
Don't know what will fit, but be sure to buy a wrist trainer at the same time. :D

Stock throttle action is already on the heavy side, using a quick-action spool makes it bloody heavy!

Most triple owners that fit these things throw them away after a couple of months...

piet
Click to expand...

Piet i stil use Tomaselli , after your advice and shortened carb spring i dond shake my right hend so often . It works great .
 
Bob

You may be able to simply fit a Japanese dirt bike twistgrip drum inside the handlebar switch clamshell, the handlebar itself should keep everything aligned. Going to a increased diameter groove in the twistgrip drum will probably mean that the throttle cable will have a fairly large acute bend in it where it emerges from the 90 degree cable guide screwed into the bottom of the switch housing. You may be able to fix even this with a Dremel tool or similar to cut a relief groove for the inner cable wire, it will depend on how much larger you go in the twistgrip diameter.
There was a thread earlier on this, somebody mentioned a UK (? maybe Australian?) supplier that used to "expand" existing twistgrips to do what you're trying to do, bu whoever it was has long since moved on. Piet is right, unless you put the low tension return springs in the Dell'ortos, the pull on the throttle will be so hard that your right forearm will get almost as strong as your left one (if you still have the the standard clutch lever setup). Maybe a good idea when you finally dump the Dell'ortos and fit Mikunis, otherwise not so good.

Laverdaton, the dual cable Nippon Denso throttle you are looking at is probably an open/close throttle, one cable pulls the slides open (like the original Laverda one), the other one pulls the slides closed. Necessary for more modern carburetors like CVs or flatslides that can't use heavy slide return springs. You can use the GS550 throttle, just don't install the return cable; maybe plug the hole to keep funnelweb spiders out. I use a Suzuki GT750 dual cable twistgrip on my Jota, looks identical to the original one, but I do use the second throttle cable because I have RS36s.

Ken
 
Get a throttle tube from an LC,
                                          it`ll just fit in the Lav bit with a little fettling,
                                                                                                      you still have to wind it on loads though...
 
I have gone the QA route on both twins and triples using a Magura MX throttle and opening out the std Suzuki switch housing. It is an easy job with a die grinder but you cannot go back to the standard throttle piece after. You keep the original switching as it just sits over the clamp section of the Magura. It is barely noticeable, in fact on a production racing triple it was never picked up by the scrutineers. In both cases we cut down the springs (are lighter ones available it would be a better option) and the throttle action is fine. The bike feels suddenly twice as powerful as you actually open the slides when you give a bit of throttle, and can get full throttle when you want it without having to dislocate your wrist. Highly recommended.
 
one trick which does work - I've used it on things like GS1000's - is to cut a curved sliver of plastic or aluminium sheet.
ID curvature same as existing cable drum. OD curvature starting off as a point and expanding to be about 3mm high at the full throttle point. Epoxy in place in the cable groove.
Result is a progressive quick action - with usually no geometry problems with the cable inner - and cheap.....
 
I just noticed on MotionPro's web site that their Revolver throttle comes with 4 interchangeable "throttle reels" in 35, 40, 45, and 50 mm diameters. The generic picture (and installation videos) on the web site indicates it's a motocross style throttle that runs the cable parallel to the bars, so it won't look real original. And they're compact enough you can just squeeze them onto the right handlebar with the original NipponDenso switch block still in place to give starter switch/kill switch functions.
I don't know what the Laverda standard NipponDenso throttle drum radius is, anybody have an easily accessible one to check?

Ken
 
If you buy an RD Yamaha one then you need to attack it with a Dremel but it works fine and gives a slightly quicker action.
Got mine from Yambitz ?? I think.
 
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