Carburetor: Adjustments

Fig. 9 Choke linkage adjustment. First stage:

Fig. 10 Choke linkage adjustment. Second stage:

Fig. 11 Choke linkage adjustment. Third stage:

1. Remove choke cover.
2. Hold choke blade closed, then open and close throttle to allow fast idle cam to set.
3. Disconnect choke opener hose from thermovalve A, connect check valve in line with hose, Fig. 9, then pressurize choke opener with compressed air (15-85 psi) to hold bleed valve closed.
4. Press choke opener lever towards opener until the opener rod seats against the closed bleed valve, pull choke drive lever down against opener lever to remove free play from linkage, then measure clearance between choke blade and carburetor bore.
5. If 1st stage clearance is not within specifications, adjust by bending tab D, Fig. 9
6. Remove check valve and reconnect vacuum hose to choke opener.
7. Hold both levers together and push then toward the diaphragm until they stop, and tab A on opener seats against carburetor, Fig. 10, then measure the choke blade clearance.
8. If 2nd stage clearance is not within specifications, adjust by bending tab A, Fig.10.
9. Continue holding opener lever tab A against seat, release choke drive lever and ensure tab C on drive lever remains seated against spring loop, Fig. 11. If not, repeat step 2.
10. Measure choke blade clearance with tab A held against seat and tab C against spring loop. If 3rd stage clearance is not within specifications, adjust by bending tab C, Fig. 11.