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RJC — adjusting needle.

For the RJC.

Procedure

  1. Start engine and allow it to warm up. Push in on gov-
  2. Set idle adjustment screw for even operation (so en-
  3. Release governor mechanism to allow engine to ac-
  4. With no engine load, turn idle adjustment out until
  5. Apply a full load to engine. Carefully turn main ad-
  6. Remove fuel line, governor linkage, and electric choke
  7. Remove two carburetor mounting nuts and pull off
  8. Remove air cleaner adapter and choke from
  9. Remove main fuel adjustment needle (begin Spec R)
  10. Lift out float valve and unscrew its seat.
  11. Remove no-load adjusting needle, load adjusting
  12. Remove throttle plate screws and plate, and pull out
  13. Remove choke plate screws and plate and pull out

Source: manual:967-0757_Onan_RJC_MJB_MJC_Gas_Engine_Service_Manual_11-1986.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.