why is it that raptor carbs have 2 different sized main jets(ex145/150) in my shee they are both the same, is it supost to be like that or should they be different. please explain,[img]i/expressions/face-icon-small-confused.gif[/img]

mini

 

It is because one of the carbs has the job of providing fuel to two (2) intake ports. The Raptor has five ports, three intake and two exhuast. Hope that answered your question. [img]i/expressions/face-icon-small-smile.gif[/img]

 

so the shee's are suppost to be the same??

mini

 

Since the Banshee is a twin cylinder the fuel supplied will be the same
for each cylinder.

 

ok, thx
i understand now hehe

mini

 

miniblaster,

here is a picture of the raptors combustion chamber and 5 valve setup

 

wow, that is kewl.
thx

mini

 

YEA, what he said!!!!!!!!!!!!!!!!lololo

 

I thought it was due to different intake track lengths. Some of the old Honda XR350s (and other bikes)had twin carbs with different jet sizes. I thought the air velocity was different between the two carbs due to different lengths from the valves to the filter. The venturi principle says with a slow velocity, you pull less fuel, so that one will need a bigger jet. I may be wrong though.