3 thoughts.. there are different dampers for different applications. Are
they both the same?
next is the needles. Are they the same? 3rd is the jet ovalized?
DaveP
On 7/31/2016 2:33 PM, David Griffiths wrote:
> Hello all. I would welcome some advice on one of the carbs on my TR3, #15005.
> Itâ??s primarily the rear one that is giving me trouble.
>
> The car has been running too rich for a long while and I decided to sort it
> out on the weekend. I took the air filters off. The first thing of interest
> was a difference in the behaviour of the two pistons. Both carbs have damper
> oil in them. The piston of the front carb was pretty hard to push up - I
> pushed a good way, and when I let go it fell quickly down to the bottom with
> a satisfying metallic thud. The rear piston didnâ??t offer the same
> resistance to being manually displaced upward. It was easier to push up, and
> when I let go of it, it fell more slowly down and not with a metal to metal
> click - more a soft noise. However, when I removed the damper, it fell
> quickly and with the same â??clackâ?? as the forward carb. So itâ??s
> centering properly I think. I removed the chamber, spring and piston and
> cleaned them carefully, and put them back in, but still exactly the same
> behaviour. Both carbs have the same damper oil. So that is one thing that
> puzzles me.
>
> The front carb is running a bit rich - it shows yellow on the Gunson
> colortune, but the plugs are ok and the rpm does not increase to speak of
> when I lift the piston a little.
> The rear carb, judged by the thick, black layer of soot on the plugs, is a
> lot worse. When I lift the piston the revs increase noticeably and stay
> there. The trouble is, that even with the mixture adjusting nut screwed
> totally upwards itâ??s still far too rich. The car may be sucking a bit of
> air along the throttle shaft, but this should if anything lean out the mix.
>
> There is one more thing that might be important, but I havenâ??t researched
> it up yet. Just under each carb there is some kind of metal contact with the
> exhaust manifold, a kind of metal buttress or similar. It was hard to get a
> good look at it today. Well this is wet on the rear one and dry on the front
> one. I canâ??t say more just yet until I get a better look at this area.
> There is some smoke wifting up from that area after the metal heats up, but
> it doesnâ??t smell like burning fuel or oil.
>
> The car runs very well and I think that the rest of the motor is more or less
> properly adjusted. Valves are good, breaker gap is correct, plugs are new and
> gap correct. Timing is ok. Coil I have not checked, but the car runs and
> idles fine.
>
> So there it is. One problem - mixture too rich even with nut screwed up to
> the max. One maybe problem - piston of same (rear) carb falls slowly.
>
> Very grateful for any suggestions,
> Dave
>
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--
Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM
87107 505-352-1378 Go HERE: my world www.porterbikes.com/
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