1991 Indy 500 starting hard

[TYOUNGBL]

Hi, I have an indy 500 that won't start easy at all. I blew the crank out of it 2 weeks ago along with both pistons being badly scuffed. I have since put a rebuilt crank in it, all new seals, 2 used pistons, pto 120 psi. mag 100psi. all new gasline, rebuilt fuel pump, new filter, cleaned carbs twice. It starts very hard starving for fuel it seems, once I get it running it will idle (2400rpm) and works good with a slight bog up to 5500 then comes out of it. Shut it off and it starts hard all over again 1 minute later. Could the diff. in compression do this?

 

[xxx]

crank case is leaking
leak down test

 

[sled]

I also have a indy sks 500.My sled was great for starting but the last time I rode was hard to start then the bog at the same rpm as you.What I found was that the boots from the carbs to the engine were cracked with age.Had to do a field repair with some tape around the boot on the crack once I did this she start good and was able to make it back to my cabin.So I would check the boots on your sled.
SLED