Another of those 'for what it's worth' experiences.

Following my post about the kinked hose on the Ruby causing overheating and lost horses I have now found a new way lose 'get up and go'...

My '34 Special runs with an S.U. carb and for some while now has displayed a marked reluctance to propel itself at anything more than about 45mph. Last season 60mph was perfectly possible whenever bravery overcame common sense. Last weekend I decided to have a real go at finding out what was wrong. Made all the usual checks of ignition and fuel - nothing apparently amiss. In the ensuing 'Hamlet' moment I suddenly thought - what if the butterfly isn't opening fully?

Whipped off the intake trumpet - peered inside - lo and behold I found that the butterfly was only 2/3 from the horizontal when the throttle was fully open. The accelerator linkage clamp to butterfly shaft had loosened and allowed the shaft to rotate a little. Reset the position, pinched up the nut - and found on test that 60+ came up without miraculous ease!

A friend of mine had a similar experience on one of the continental runs that the Brooklands Centre of the 750MC organised in the 1970s. His Chummy refused to do more than about 35 mph; investigation revealed that the accelerator pedal was hitting the carpet before the throttle was fully open. Re-setting the accelerator lever on the throttle shaft transformed it!

David