sxr carb rejet???

L

lextoy

i have a 98 sxi pro, pretty much stock except for aftermarket f/a's
just picked up a set of new sxr carbs intake manifold etc.
if i want to swap the carbs onto my 750 sxi pro and reuse the F/a's what jetting should i use???
the stock parts from the sxr???
or the current setup in the sxi pro carbs
currently
147.5 mains 1.5 turns out
72.5 pilots 1.25 turns out
2.3 N/S
95 gram springs
anyone swap the sxr carbs into a sxi yet???
 
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L

lextoy

btw they are prok f/a's and the original sxi pro carbs have choke plates removed and primer kit installed, i will be doing the same to the sxr carbs...
 
john zigler

john zigler

Vendor Account
Location
wisconsin
the SXI pro carbs, & SXR carbs are the same. the only difference is the jetting. are your pro carbs bad? if you are just needing to replace your pro carbs , just jet the SXR carbs the same as your pro carbs were. (as long as they were correct).

zig
 
L

lextoy

cant tell if the carbs are bad or not, but cant find anything else leaking, one carb is pumping fuel at idle, the other is not.
the ski had a hesitation of about 2 sec off idle, then runs fine to WOT.
also seems to run away on the trailer a bit at idle. like a lean condition or a leak.
carbs have been gone over 3-4 times already by me and several proffesionals.
but we still cant get the ski to tune properly.
so i'm going to try swapping in a known set(brand new set) of SXR carbs.
i dont know if the jetting on the current carbs is right or not, cuz the ski hasnt run properly with them on yet.
if i have PROK's and a promer kit installed, a cool head(stock compression)
and nothin else, does the jetting sound right???
 
L

lextoy

okay i got a new set of sxr takeoffs, new carbs intake reeds etc.
what carb jetting should i use if i bolt these onto my sxi pro???
only running PROK airfilters. chokes removed primer kit installed.

STOCK settings on a
SXR
mains 132.5
pilots 72.5
1.5 N/S
80 gm spring (black) 38psi

SXI PRO
mains 147.5
pilots 67.5
?????N/S ????????spring

not 100% on N/S and springs yet...
if i want to run PROK's and primer kit installed what should i run??
i am assuming as per LPW recomendations...

147.5 mains 1.5 turns out
72.5 pilots 1.25 turns out
2.3 N/S
95 gram springs

or should i just run the stock SXR setup cuz the sxr is an 800cc vs 750cc for the pro??? minor adjustments of course.
 
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Crab

Crab

thanks darin...noswad!
Location
Seattle
Mine run 75 low, 145 high, 1.5n/s, and 80 gram stock spring. Modded stock airbox, no chokes, crossover filled, single screens. About 3/4 on the low and high jet. Small pin with exhaust porting . They were way rich jetted for an SXR with wet pipe, but great now.
 
Crab

Crab

thanks darin...noswad!
Location
Seattle
Yes black spring, 38psi supposedly but I only got about 32-33. Any lower and it just blubbered like a baby. Remember with the crossover filled the signal is stronger and the jetting is a bit lower I think.
 
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kevbo

kevbo

Location
dfw
The SXI pro needs larger jets than the 800. I would use a 150+ main, 75-80 pilot and a 65-80 spring as a safe place to start.
 
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