Lambretta Throttle Cable Replacement
This section shows a quick step by step of replacing a throttle cable on a series III Lambretta. The one in the photos is an LI125 Special which has a similar headset to the TV and SX, but the images will work for an LI once you've removed the slightly different headlight rim.
Remove the upper 2 small
screws that hold the headlight trim to the headset. The lower ones can
stay in place or you can remove them too for easier access once the
headlight is removed.
On the underside of each side
of the headset you'll find a single flathead screw that needs to be
removed. This will allow the headset top to be removed.
Disconnect the small light for
the speedometer which is a friction fit, and then push the speedo cable
up from the front fork to get enough space to unscrew the speedo cable
from the speedo housing.
Remove the left side panel to
get access to the carb. The throttle cable is the cable shown above
with the red arrow. Now remove the inner cable by cutting one end or
the other and pulling it out through the cable outer which will remain.
New cables come in a variety
of ways, but you'll need to have a removable part at one end or the
other. I choose a cable that has a soldered nipple for the carb end,
and a removable nipple at the headset end.
Thread the new cable in from the carb end after lubricating it in oil. You should have a fair bit of extra cable poking out at the headset end.
Connect the soldered nipple to
the carb slide, and be sure the outer cable housing is well seated in
the throttle adjuster as shown.
At the headset end you should
have the inner cable sticking up at the throttle pulley. Your pulley
may be a cast metal piece but should function in the same way as these
later plastic ones. Try pulling on it to make sure the carb slide
Find the top of the throttle
cable outer and make sure it is seated in the metal stop where the
arrow is shown above.
Fit the removable upper nipple
in to the throttle pulley and thread the inner cable through the
Turn the throttle twist grip
back to its stop and pull the inner cable tightly but not enough to
move the carb slide. Then tighten down the upper nipple and test to see
if the carb responds. If it is a little sloppy it can be adjusted at
the carb adjuster, but if there is major slop in the response, you may
need to do the previous steps again and tighten the upper nipple once
The final step is to clip the
remaining inner cable at the nipple and use some grease on the cable
and nipple where it touches the pulley . Replace the headset top being
sure to reconnect the speedo light and speedometer cable, and you
should be good to go.