Club 80-90 Forums

Trying to set my Carburettor (CT )PICT 34/4 fuel mix. The haynes manual says 0.3 to 0.7. Seriously! i cant it any where near, do i have excessive fuel pressure? My lowest is about 6%.

I probably havent made my point clear

Have you calibrated it, mine has to run for about 20 minutes to get it to stabilise properly. Is everything else tuned on your engine, timing, idle, etc.
Once the level had stabilised in air to 2.0 it worked fine, should then stabilise when running on the engine. Make sure you have the clear tube running downhill to the drain pipe at the back, if it fills with water it gives false readings.

I set mine up, and the mot agreed with the value I had set to, so it does work.

I ll leave it a little longer in the exhaust but the thing is ,even the MOT man laughed at the prospect of running at 0.6 co%, i was wondering who is right him or the manual.

1st off go read the instructions again, carefully... what I am about to say is in there but with the added benefit of experience...
No... you dont leave it in the exhaust..... take it out, leave power connected to the battery (usually a good idea to have a good second battery or another vehicle to have it connected to) for 30 mins on a nice flat stable surface right where you are going to use it.. ie near the tailpipe... they need time to settle BEFORE you use and if you have been using it a lot then you need to allow it to "clean" itself... adjust the "calibration" to the 2.0% let it stand for 2 or 3 mins after each adjustment, tiny tiny adjustments on the cal... make sure the 2.0% or near is stable....

make sure your engine is up to temp, pref take it out for a run and give it a bit of stick (this is where its ideal to have the co meter connected to another battery or vehicle...)
then pop the tube in the exhaust up as far as poss... reading should come up real quick.. adjust the co screw on the carb to get it below 3%.. (limit could be 3.5% IIRC depending on age... 0.6 isnt realistic and I suspec the haynes is wrong...) should be poss if air filter clean fresh oil, timing correct, etc etc..... unless its all worn out....
After use leave it connected to the power for another good 20 mins to allow it to burn off any deposits....

They are cheap (yes they really are cheap) for a reason, they need time to settle...

I guess im gonna have to do it properly now
Thanks all.