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Warkton Tornado No.1 wrote:The JJH needle full geometry is listed somewhere, but I do not have details to hand. However, I managed to buy a few genuine Keihin type from a dealer for Sherpas (no! Not the van ) that seemed unaware of their true value. Ha!
Also got a few drain plugs the same way because I wanted to fit a miniature drain tap, envisaging that there would be the requirement for lots of jet changes. That's simply not been the case, but a useful addition IMHO if only to avoid a mess on our silky smooth Queen's Highways.
The pilot jet on my 34 mm PWK has been made accessible without bowl removal via slotting the threaded portion where the drain plug fits. It is simply to allow access with a slotted screwdriver. I saw that many fans of PWK's advocate this simple modification, & it is really worth doing. The drain plug has a 'O' ring fitted so there is no loss to the sealing ability.
As you are running piston ported, you might later wish to try a power jet. As my appeal for recomendations on Forums met with little response about sizes of jets etc, I have grafted on an adjustable miniature needle jet valve atop the opening to the Venturi (bell-mouth you might refer it as) but it's not yet in use as the carb is temporarily adorning a reed valve motor.
BTW. This may be teaching grannie how to suck eggs, but a kill switch fitted in easy reach of the right hand whilst holding set throttle openings is extremely useful. It can, say, be a toggle switch grafted on or proprietary kill button. My favourite is to use the horn button via having a changeover switch fitted elsewhere (my SX has a key operated threeway switch with adequate amperage in the legshield toolbox top) so that I can select 'Legal' or 'Not so Legal but testing, Officer'
I'll get main jet setting on here later.
Oh. I should mention that I think it worthwhile fitting a good fuel filter, in line if necessary, as the screen mesh of Lambretta type are fairly crude plus the majority have a hole in the top! Probably good practice whatever carb is used....
Adam_Winstone wrote:
Yes, this is the common (Dellorto'esque) chart that is readily available on lots of sites... just odd that it doesn't list the JJH needle, which actually seems to be quite commonly quoted! I'd rather not make any assumption re: what the JJH might be as it would be just my luck that it doesn't fit the pattern.
Thanks
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