My Tourmaster came with Factory needles and 160 mains. I always had a
little trouble getting them dialed in just right, but... 39mm Flatslides
work great!
Vern
Gary Rathbun wrote:
>
> Calling all carburetor gurus! I'm having problems getting my TourMaster
> running right:
>
> It has titanium needles with C-clips (don't know the
> brand/model--whatever PCW uses), and .157 main jets.
>
> If I put the C-clip in the second slot, it runs fine in the low range,
> but very lean at cruising speed and deceleration.
>
> If I move the C-clip to the third slot, it's much happier at cruise and
> decel, but chokes and stumbles when easing away from a stop. I tried
> turning the idle adjustment screws in, but even at only 3/4 turn out
> from fully closed, it still stumbles. It's evident that the needle
> position has some effect on the low range.
>
> If I put it in the second slot and add a shim washer, I get a compromise
> of the two above: stumbles a little off idle, and pops a little at
> cruise.
>
> The carbs are properly synched, and the idle circuits have been blown
> out. It idles fine.
>
> Questions:
> - I have a set of .160 main jets; if I install them, might it help to
> richen up the midrange, as well as the full-open? It accelerates fine
> at wide-open throttle, no popping or hint of problems, pulls good up to
> redline.
>
> - I'm buying a set of needles and jets from Tyler Pennock, in hopes of
> finding needles with a steeper taper, since it seems like a steeper
> taper would solve both problems: i.e., let me adjust the needles for a
> smooth start at low range, yet richen up the midrange. Any thoughts on
> this?
>
> - How about tweaking some of the other jets/adjustments in the
> carburetor? I'm not very mechanical, but have a service manual and am
> willing to tackle a moderately difficult job.
>
> Any help much appreciated!
>
> Gary Rathbun
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