Motorcycle Repair: 1999 DYNA LOWRIDER, intake leak, rpms

Question
QUESTION: WHEN I FIST START MY BIKE NO MATTER HOW LONG I LET IT WARM UP IT WILL SPIT FART AND BACKFIRE FOR THE FIRST MILE OR TWO THEN WILL RUN NORMALLY IT CAN BE WARM OR COLD OUTSIDE I HAVE CHANGED THE PLUGSAND WIRES THE BIKE IS A 1999 DYNA LOWRIDER I BOUGHT ITLAST YEAR

ANSWER: Are you leaving the choke out the whole time its warming up?
Mike

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QUESTION: i leave the choke on untill the bike stays running

ANSWER: take the bike out and run it for about a mile with the choke about half way on and let me know what happens
Mike

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QUESTION: i warmed up the bike tonight andleft the choke out about half way i pulled out of my drive onto the road and it spit and backfired the whole mile it did not matter if i put the choke in or out after about 3 miles the bike run normally

Answer
It sounds like you have a intake leak and once the motor warms up the leak seals from the expanding of the engine. Check it with some carb cleaner. Spray a little around the intake with the motor running. If the RPMs go up, then you have a leak
Good luck and happy riding
Mike