Giday Guys

I have a nova +4 with 41021man and 9901 pipe
I have trouble starting when hot it is fine starting when its cold.
Real hard to start if i give throttle when trying to start or if pit guy put finger over pipe to try give more fuel.
I find the only way to get started when warm or hot is to trim throttle 3 or 4 clicks and bump start on box 2 or 3 sec at a time for 10 or more times. But this still takes lots of tries to get it going (if flames out in race it pretty much allover as it take forever too get it going again)

If you know what i mean. (i am fairly new to this rc game)

and i am using rb5 plug as cant get nova plugs from LHS.

So can anyone out there able to help me with this problem
P.S would odonnell 97t be better?

cheers thanks in advance.

Dave