Motorcycle Questions? Ask a Mechanic.
Hi and welcome to JustAnswer,
Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, this particular model for its choke uses a Starting Enrichment (SE) valve that is manually engaged when the choke knob is pulled.
Proposed first check would be for the smooth operation of this knob and the attached cable to the carb ass'y.
Secondary check would be on the SE valve at the carb itself.
Please post back results / observations of the above once checked and/or should additional information be needed.