Did you check that pipe yet ? I had trouble with the JP2 pipe at the pressure fitting . If this is ok , then you need to finish running in the engine first .
If it has really good pinch this is a good thing . Get the engine started and ajust the low end so it has decent idle and throttle resonse, decent now not deadly !!! Now your ready for some break in time . Next you need to ajust the tope screw so when you sqeeze full throttle the engine will go VERY RICH ! And acctually slow down ,and pick up as you let off. At this point it should be faster at half throttle than at full throttle!! Run it like this for 20 or more tanks !! That will equal almost a gallon of fuel. You will notice the engine will get faster and faster as you go through the tanks of fuel , when it gets to a point where the engine doesn't want to idle, turn it up and start to lean out the top end ,only lean it a tiny bit at a time !!! AND ONLY AJUST IT AFTER IT IS AT 200+ degrees of temp ! Or you are sure to get things too lean . The longer it takes to run in the engine the longer it will last! I get an average of 14+gallons with only a slight pinch and a rod change at 10gallons.
You always want to SNEAK UP on a race tune !!
Oh and you can race the buggy all the time your running it in , just remember that you DON'T WANT TO RUN OUT OF FUEL ! And you must not try to lean out the engine yet . IT will come around when it is ready TRUST ME !! I've been doing this for over 20 years !
As the tank gets low the engine will of course go lean , this is ok as the entire time you are heat cycling the engine