Blackjack 48mm + jetting

[Polish jet pilot]

Hi All!

I want to install a 48mm carb on my custom 550 pp Kawi (full modded engine, ported, westcoast pipe and waterbox, hi -comp head, ported L&S cyl, etc) I ride sweetwater at sea level. Need your professional help here..looking for bottom punch..

 

[crammit442]

Hi All!

I want to install a 48mm carb on my custom 550 pp Kawi (full modded engine, ported, westcoast pipe and waterbox, hi -comp head, ported L&S cyl, etc) I ride sweetwater at sea level. Need your professional help here..looking for bottom punch..

That's a LOT of carb for a 550. It will probably work, but any carb that size may be a bit temperamental on that little motor. Email Art at Jetworks and see what he says.

 

[SuperJETT]

I ran a single 44 sbn on my 550 with very similar mods plus MSD total loss, and it ran perfectly clean/strong.

 

[crammit442]

I ran a single 44 sbn on my 550 with very similar mods plus MSD total loss, and it ran perfectly clean/strong.

I did too w/o MSD and it ran very well. I was just thinking that a 48 is a really big carb and might be somewhat unforgiving on a motor that small.

 

[Foximus]

It might be a bit big but I think it will work fine. A lot of people run dual 44s, I think that removes all the snap to the motor that a 550 should have in the mid range. So a 48 shouldnt be any worse.

 

[Polish jet pilot]

Exactly what I was thinking.. running dual 44's or even 46's it's a lot of carb too... anyways how should I start with that carb? What should I do first? Get it to idle? Next..?

I was also thinking that the pulsation could not be strong enough - do you think an external fuel pump could be useful??

Thank you...

 

[Big Kahuna]

I would just stick with a 44.

 

[Polish jet pilot]

What settings you guys would recommend? What pop off, needle size (Mikuni book says the smaller the better)... what pop off range should I am for? Am I making any sense here?

 

[iptamenos]

big carbs for small engine