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(Snip)... The car has 45 DHLAs on it and in looking at the recommendations in the forum it seems over jetted on the cold start and pump jetting. I think it may be overfuelling so that's likely my next stop.
What size chokes are in your 45DHLAs?
Are the carbs properly mounted with 'Soft Mounts', and without over-tightening and crushing the O-rings?
Are the carbs properly 'Balanced'. And, "Well, I tried" isn't the same as "Yes". Have you accurately balanced the carbs? The engine will run like crap when the carbs are out of balance.
On each carb, under one of the screws that secures the Top Cover, there should be an oval, aluminum tag with a 4-digit number and a letter (A or P) stamped on it. What are your carbs' two Tag Numbers?
What is the current jetting set-up in your carbs?
Jensen-Healey
. . . . . . . . . . . . . . . . . . . NON- . . . . EURO
. . . . . . . . . . . . . . . . Emissions . . Emissions. . . Yours?
Throat. . . . . . . . . . . . . . . 40. . . . . . . 40E . . . . ___ (45, or 45E ?)
Choke . . . . . . . . . . . . . . . 35. . . . . . . 35. . . . . 36
Aux. Venturi. . . . . . . . . . . 8011.1 . . . 8011.1 . . 8011.1
Main Jet . . . . . . . . . . . . . 130. . . . . . 130. . . . . 158
Main Air Corrector . . . . . . 160. . . . . . 160. . . . . 230
Main Emulsion Tube . . . 7772.5 . . . . 7772.5 . . . 7772.5
Idle Jet (4 Spd). . . . . . . . . 50 . . . . . . 55L . . . . 58
Idle Jet (5 Spd). . . . . . . . . 50 . . . . . . 52L . . . . ___
Idle Air Corrector . . . . . . 7850.1 . . . 7850.5 . . . 7850.9
Pump Jet . . . . . . . . . . . . . 45 . . . . . . 45 . . . . . 60
Starter Jet . . . . . . . . . . . . 70 . . . . . . 70 . . . . . 95
Starter Emulsion Tube. . . 7482.1 . . . 7482.1 . . . 7482.3
Float Weight . (gm) . . . . . 8.5 . . . . . . 8.5. . . . . ___
Float Height. . (mm) . . 16.5-17.0. . 16.5-17.0 . . ___
Needle Valve . . . . . . . 7180-15. . . 7180-15. . . . ___
Mixture Screw . . . . . . 3 1/2 to 3 3/4 Turns Out . ___
Note: Standard jetting specs presume Sea Level (ie, standard atmospheric pressure). The higher your location is from Sea Level, the less air will be ingested on each stroke, and the richer the mixture will become... to the point of chugging and blowing black smoke. The factory setting should work up to about 2500' ASL, depending upon how fussy you are. Over that, plan on re-jetting the carbs for your altitude.
Regards,
Tim Engel
Last edited on 04-22-2023 05:01 am by Esprit2