98 sportster 1800 starting questions

[motocrosstar2004]

My boat runs great just installed both rebuilt engines and rebuilt carbs etc. They both run excellent but the problem is that one engine takes a while to start it cranks along time and then when it finally starts it seems u have to have it at full throttle and then when it fires it seems like its loaded up and and takes a moment to clear and catch up to itself. But once started it runs great with no issues. The other engine seems to start fairly quickly. I am haveing the same exact problem with my 94 spx. It takes a long time to start same exact problem. My question is what might be causing this and how quick should it fire?

 

[parrothd]

replace the needles and seats, they're leaking causing the engine to extra rich and hard starting.

 

[motocrosstar2004]

ok do you by any chance kno what size that needs for the sportster 1800 and what size for the spx? If not i guess i will have to take them apart and find out before I order.