View Full Version : jetting with psi quads
maxman
12-04-2005, 08:11 PM
can any body give me some idea's on jetting for psi quads, on a 750 and running at sea level. i have stock jetting for a 800 because i was running the 800 pipes but it is running way to rich. jet size and needle clip position? even with it running rich, big improvment with the quads.
mark the shark
12-05-2005, 12:01 AM
My documentation for my PSI Quads on my '93 750 says this:
YVX4-04-02 YAMAHA VMAX-4 STAGE II MOD QUAD PIPES
JETTING SPECS: SEA LEVEL
SAFE TO 10 DEGREES
PILOT 47.5
AIRSCREW 2 TURNS
NOZZLE 499 Q-4
NEEDLE 6GN14 3RD
MAIN 137.5
*For high altitude, lean 1 main jet (2.5 increment) each 1200-1500 feet above sea level
It is mandatory to use premium fuel 92 or better octane for these pipes! Our jetting specs were developed on a 1993 model.
I did not install my pipes. I had them done at a speed shop back in '94 by a guy who had been working on Yamaha sleds for 18 years at the time. I have a PDF document on my computer with all of the installation, tuning, clutching, repacking, etc. info. It's too large to post here, but let me know if you need any more info and I'll try to get it to you.
Shark
ghodder
12-05-2005, 07:55 AM
mark the shark,
I'd like a copy of that PDF. Would you mind emailing it to my email address zievopendulum@gmail.com ?
Thanks in advance
racer7x
12-05-2005, 11:18 AM
me toooooooooo !!!!!!!!!!!!
YAMMIEGOD 3:16
12-05-2005, 12:16 PM
TAKE THESE JETTING SPEC,s AND ADD A SIZE OR TWO TO YOUR MAINS. GAS SUCKS TODAY !!! WAY BETTER 10 YEARS AGO. 3:16 (tony)
Big Willie Style
12-05-2005, 08:05 PM
Mark the Shark if I could get a copy of that to that would be great!, you could email it to my93coupe@yahoo.com
Thanks, BWS
mark the shark
12-05-2005, 08:34 PM
I agree with YAMMIEGOD. I buy 93 octane gas and then add a little octane booster to it.
I was trying to send the PDF to KING OF THE LAKE from home this afternoon and wasn't having much luck. I'll try it from here at work a little later (they're making me work tonight). I scanned the individual pages before I left home, so you might get it that way.
Shark
Okay, I sent the PDF document to one of my own accounts and it worked, so I sent it out to you guys. Let me know if it goes through.
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