i just bought a set of 38's from a mach-z. im looking for a starting point for these carbs. they have no jets in them at all. granted i will be running these in the summer, but winter info is somewheres to start. 
staggs65
Moderator
i forwarded you a pm with VALINs recommendations for a starting point on my 780 with stock pipes/no case work. might help some
valin
Active member
We need more details in order to help you.
Is your motor case ported? What is the compression ratio? Are you running the 835 pipes? What year of a Mach Z are those carbs from? What needle jets are inside of them? What needles?
Is your motor case ported? What is the compression ratio? Are you running the 835 pipes? What year of a Mach Z are those carbs from? What needle jets are inside of them? What needles?
ok, case ported = yes
835 bender pipes = yes
what year mach z carbs = dont know ? how can i tell or find out ?
compression ratio = not sure, squish is .47 13:1 ish...
needle jets = godda buy em, empty carbs.
needles = there again... dont know ? how can i tell or find out ?
835 bender pipes = yes
what year mach z carbs = dont know ? how can i tell or find out ?
compression ratio = not sure, squish is .47 13:1 ish...
needle jets = godda buy em, empty carbs.
needles = there again... dont know ? how can i tell or find out ?
bufalobob
Member
w/.47 squish you should run about 25% c-12 & 75% hi octane pump gas.
summer jetting w/ K&N filters or gutted air box w/ top cut out:
mains: summer-390 all; winter 470 all
needle: 8ADY-1; middle clip
needle jet: O-2
pilots: 40 all
the flipper has a shorter throw w/ the 38's so watch the oil cable adjustment!!
bob
summer jetting w/ K&N filters or gutted air box w/ top cut out:
mains: summer-390 all; winter 470 all
needle: 8ADY-1; middle clip
needle jet: O-2
pilots: 40 all
the flipper has a shorter throw w/ the 38's so watch the oil cable adjustment!!
bob
ia am also going to premix, ratio ??????
thanks bob, thanks valin. now that you guys have givin the fuel, how about the clutching ?????? to much $$$$$ to test these days. 3-4 helixes, 2-3 springs on and on and on...... i have 8bu00, 8bu10, 8dn20, and heelclickers. and probably others that i cant think of off the top of my head.
valin
Active member
On the grass.....run heel clickers. Good luck with the testing.
not on the grass, gave that up back in 02' only asphalt (bracket racing) nothing heads up. wuz hoping not to have to "test" to be faster than the OTHER brands. at least start with something that works well with what i have. I am not sponcered by anyone, i dont have anyone giving me parts. my sponcers are you guys !!!!!!
valin
Active member
What distance? I'd still run heel clickers, with OEM springs, and probably in the neighborhood of a 53/43 helix, pretty stiff in the secondary.
1320. for stiff in secordary, i have a hauck silver, or a bender red. i usually wrap the silver to 80 ???? up front i have either a heelclicker red or a hauck orange. they are calling for rain here on saturday. %^&* first day of test and tune at our track
valin
Active member
Wrap it no further than 70 degrees on the stiffer springs. Stay away from the long heelclicker springs.
bufalobob
Member
primary:
heelclickers w/ red h.c. spring - check heel to sheave clearance @ full shift!!
4.7gr tip;6.4gr inner;2.8gr heel
15.6mm rollers
secondary:
53/45
bender red @ 30*
bob
heelclickers w/ red h.c. spring - check heel to sheave clearance @ full shift!!
4.7gr tip;6.4gr inner;2.8gr heel
15.6mm rollers
secondary:
53/45
bender red @ 30*
bob