5hp briggs problems

#1
on my chopper mini bike i just took off the 3.5 horse briggs and upgraded to a 5hp its a newer 5hp motor that dosent have any points in it(under the flywheel got the flywheel set the same as other 5hp b&s on my speedway that has points) i have to open the choke and open her all the way open to get it to start once its warmed up it starts first pull is there a different adjustment for the flywheel then the older motors or any other ideas so ill start easier
 
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