After putting new pipes on my bike does not idle well now,give it gas and it falls on its face. Spits and backfires???

 

oh it's a 2000 road king fi

 

You have an exhaust or an intake leak, OR you need to tune the bike. My initial guess would be an exhaust leak because that was what was most recently worked on.

You have the Magneti Marelli fuel injection system on your bike, and this is a topic for a different time, but those systems are prone to issues without reason. I hope this isn't the case in your situation!

 

no leaks ran fine with stock pipes no issues soon as I switched it started...

 

As stated previously,"You've got a leak".

 

Explain please

 

Start your bike and let it idle, then spray some brake cleaner around the pipe where it meets the head, if the idle changes at all, you have an exhaust leak and either need to tighten the nuts on your exhaust studs, or need to replace the exhaust gaskets. You can also do this around the intake seals where they meet the head, look for the same change in idle; no change, no leak, if the idle does change, you have a leak there and need to replace the intake seals...

 

We'll I checked exhaust studs all tight I replaced gasket last spring, I did find a Crack in the header pipe rear cylinder on the inside,right side at the bend, and some carbon build up around the joint of the slip on the right side. I welded the crack I found last spring on the outside of the header pipe and it ran fine with it prior to welding it?

 

Baffles??

 

yes there is