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sounds like it may need the carb clening out, but it could be the auto choke not closing when cold. there was an issue with some of the early auto chokes on the gcv135/160 engines so check to see if the choke flap is in the closed position when starting from cold, run the engine for approx 10-15 minutes and see if the choke flap has opened fully.leave it to go cold and see if the choke flap has returned to the closed position
If the bike has been in storage for any length of time, more than a year or so, the carburetor is plugged up and needs to disassembled and cleaned. If that's not the case do a compression check. You need to see at least 140 psi of compression for it to start reliably. If the compression is low, adjust the valve tappet clearances (tight valves will cause low compression).
Other than that, make sure the choke is functioning properly and that there are no air leaks between the carburetor and the engine.