Oh boy!.... I know something SP don't!...
You can run your old pet,... on Prime... but, you must have that vac line blocked...
That is your problem... your vac line is leaking fuel into the engine...
Be sure that you block it at the pet... so fuel don't pour out of the tap...
... and at the carb,... so air don't get sucked in...
And,... you'll need fresh oil and filter... to get rid of the fuel that your engine has consumed...
Then,.. you can ride... 'till your Raptor comes...
Thank Yamaha... for saving out booties...
...