Post
by JerryL770 » Wed Apr 03, 2024 10:01 am
Thank you for your advices again, guys.
I'm afraid my postings have illustrated my ignorance at the workings of the carbs and choke system, caused by my casual scanning of the data looking for a dimension for the lifting of (what I now know is) the fast idle pushrod. I have now read the service manual more carefully.
Simon, I'm sure the reference to 5/8" (16mm) in the service manual does refer to the dashboard choke lever but I can confirm that the screw at B in my picture lifts ~9.6mm on my centre carb.
So, my thought that the pushrod had any bearing on the choke mechanism moving the main jet down was completely wrong. So I lifted the dashpots from my carbs and measure the main jet positions, choke off and on. There is variation in the main jet positions below the bridge R 1.67, C 1.78, F 1.56mm (choke off) and drop of R 4.31, C 3.67, F 2.86mm (choke on).
I don't know if these need evening up or how to do so but if it means adjusting the choke control rods below the carbs - it won't happen because its impossible to get to the clevis pins!! Reckon I'd have to take the carbs off with the manifold.
So, I'll live with the lazy starting if filling my carbs with fuel the day before starting after a lay off does not help.
Thanks again for advices.
Jerome Lunt
1970 S2 FHC - Dark Blue, Red Interior, MX5 Seats
2008 MX-5 NC PRHT