We're working on a similar problem with Chris's MkIII. As he just
wrote! (good timing Chris!)
According to "Original Sprite & Midget", 2.5-3.0 psi or 56 pints per
hour is the pump output.
More later we hope.
Dave W.
Burlington WI
59 :{)
Dave G. wrote:
> Continuing the saga; a never ending series - starring me and the many
> DPO's.
>
> Still not able to hold the engine speed abobe 2500rpm without
> spitting back, I decided to strip both cabs at the same time and
> compare the parts from both back and front catbs at the same time (I
> hadn't done that before!)
> Lo and Behold (Poetic - aint I?) the spring from the rear carb was
> 2.4" longer than the front one! (Insert choice of obligatory swear
> words here!)
> So I took the bits of 4 carbs - both from 1275 motors, and proceeded
> to match the springs, piston drop rates and needles (spring or swing
> type) re-assembled and reset them, then went through the basic tuning
> procedure.
> Result??
> Good idle at 800rpm, pistons rise at the same rate, no miss or
> stumbling, nice pick up when I 'blip' the throttle, runs nice at
> 2000rpm.
> *BUT*
> If I try to hold the rpms anywhere above 2500, the carbs still spit
> back!!
> No manifold leaks, timing spot on, etc., etc., etc..
>
> I'm beginning to suspect low fuel flow at higher rpms is causing it
> to lean out....
> Is there a simple test I can do to check how much the stock pump can
> flow??
> How many ounces of gas in how much time is what I'd ideally like to
> know...
>
> Sorry to be a pest.. and Thanks ;-))
>
> --
> Dave G. KK7SS
> '65 MK III Sprite in Richland, WA
>
> If I wake up in the morning, and I hurt, it means that I'm still
> alive !!
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