Hard starting whan hot?

[Hydro-Thunder]

I have a BBF 460 .060 over with flat tops and am running MSD ignition. It starts very fast when it is cold but if it is warm it wants to crank a while before it starts? Also if I hold the throttle open it seems to help?
Any ideas?
Jesse

[kceballes]

You might want to try and retard the timing.
I had the same problem last season.

[78Eliminator]

Hard starting when hot is a symptom of a lean carb.
78Elim

[Hydro-Thunder]

I checked the plugs, They look good? kceballes, It cranks fine so I dont think it is too much timing.

[78Eliminator]

Before you checked the plugs did you:
Hammer it and leave it wide open for 30 seconds and then immediately shut off the motor? If not, your reading might be wrong. If you let it idle for a while, your reading IS wrong. Reading plugs is a bit of an art...
78Elim

[Hydro-Thunder]

No I did not do that way, but I will.
Thanks
Jesse

[HammerDown]

I'm thinking possible vapor lock...When ya try to crank it over put the pedal all the way down...try it.

[sandsucker]

carb may be dumping fuel when hot take off flame arester & look in carb when hot see if its driping fuel if it is its loading engine spacer block between carb & intake manifold will help

[Kona Jet]

If you hold the throttle open all the way it starts easier? Could be your engine is getting flooded. Maybe the choke is closing and needs to be adjusted. I had this problem with a 750 double pumper carb with electric choke and the choke was set to close too early. Good luck