300/440/550 Hard Starting?

[ezmoney]

My 550 has a primer but still seems to take a while to start. I am not sure how much fuel it needs to start, but this thing seems to flood easily. I usually prime it once, let it turn over a few times, then hit it again to get it going. Then once its warm, I give it full throttle and crank it. It rolls over and kinda coughs then goes. I have been told a Mikuni Super BN carb will give more power and start easier. What size is best for a 550? Also, do they fit the stock manifold?

Thanks,
Evan

 

[Conquistador]

I normally pump the primer 3 times, no more, no less. never did it with the 550 motor though, but I don't think it really matters.

 

[ezmoney]

It seems to take longer when I prime it more than normal. But I'll give it a shot when my new starter gets here. My friend's 650 w/ a Mikuni BN starts w/o a primer shot tho. I'll have to experiment.

Anybody know what size Super BN works best on a 550?

Thanks,
Evan

 

[ski33_scottie]

ya sbn are way better... but you will need a few things for the carb.
k i recomend a 44mm and depending on what mods your motor has the jets and all could vary.
you can use the stock 44mm mani but you will need a spacer to have the fuel pump not hit the block.. you can find them on ebay.. you will also need longer bolts.

 

[ezmoney]

fuel pump? Do the sbn's need fuel pumps? My motor is all stock. I was told 44mm by another guy too.

I'm thinking about just rebuilding the stock carb.

HOw many primer shots should it take to start it?