triple pipes and rpms?

i have the aaen pipes. here's what you do for jetting and clutching, BUT YOU MUST UNPLUG THE VENT LINES TO THE AIRBOX THAT COME FROM THE CARBS OR YOU WILL BLOW YOUR ENGINE UP

jetting:

147.5 mains on pto/center
150 main on mag
needles stock w/stock position (washer underneath)
stock pilots (45's)
fuel screws @ 2-3/4 turns out from closed

YOU ALSO NEED THE SUPER-COOL HEADGASKET FROM HAUCK AND THE REAR HEAT EXCHANGER

clutching:

heavy hitters (48.5g base weight)
1/4 allen screw in heel
3/8 hex head bolt w/thick whasher in the middle hole
tip empty
stock 14.5mm rollers
heavy hitter black primary spring

stock 47 straight helix
yamaha green spring @70 deg

you'll be set with this clutch setup for 9000-9200 rpm
 
well its not the F-ing clutching, I wouldnt waste my time looking at that just yet. It should have overrevved the stock clutching mile high.
 
SpartaSXr said:
Umm I would double check that. a 165---->147.5 is a BIG jump. I never piped my Viper but something is not right here...
Click to expand...


no that is correct. you have to run the 165's w/carbs vented to the airbox because there is a vaccum created holding back fuel. when he unplugs the carbs from the airbox, the vaccum is no longer there....allowing the smaller mains (147.5 & 150) to be used. it seems like you are not richening it up, but trust me...you are.


whoever i'm trying to help out here.....what elevation are you at?
 
i pulled the cover off the powervavle servo and its not moving so i changed it and still nothing. what tells the servo to move?
my elevation is 158
 
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i got the thing running right but at the moment is dangerously lean. the carbs are set back to stock and im just gonna jet from there. so i think my main problem was my jets were WAY too big. the stock jets i took out of it and put back in it are 156.3 so im going to jump up to 160 about half way between too lean and too rich.
 
that sounds about right mopar called aaen today and thy e-mailed me the instructions and the specs and ill go with the 148.8 setup just because it gets so cold here
 
told you so:)

yeah you can run 148.8 pto/center and 151.3 mag to be safe for now.

you could probably drop down to 147.5 pto/center and 150 mag later, or for sure when its above 10deg ferenheit.

remember when you run the above jetting to disconnect the vent lines to the airbox and let the carbs vent to the atmosphere, or she will blow up.
 
Sled is running like a champ now. Thanks to everyone for there advice. Now i just need to let it get cold agian so i can really open it up
 
you have 150's in all 3 cylinders? pto/center cylinders are suppose to be 147.5 and the mag is 150. just order these jets from www.portyamaha.com

if you want to give it that little extra protection, run 148.8 in pto/center cylinders and 151.3 in mag.
 
Did he have his airbox unpluged with the larger jets? maybe thats why he wasn't pulling the rpms probably was. Everyone has their own setup but to say that was the problem (mains) it's not right. He said he was lean at stock how would he go leaner in jets and be perfect unless he unpluged the air box , I think he had the 165# in there with the airbox unpluged,then he went to stock jets which were leaner and attached airbox and said it was lean. All and all as long as it's running good but I think the guy with the airbox idea was right.
 
i left the airbox plugged in with the bigger jets then i put the stock jets back in to see if it would help but i left the vent plugged in so it was running lean with the stocks. so i unplugged them and put in smaller jets witch made it run richer when unplugged so i could go with the leaner jets. The way Aaen explained it to me was with the 165 (or larger) jets with the vents plugged into the airbox it creates a vaccum in the floats make it run much much richer. and as for the jetting im goin to buy 2 145's and 1 147.8 so i can run my sled in the 30's (mopar correct me if i am wrong) because its starting to warm up alot here but theres still 3ft+ of snow in the county and they just got dumped on the other day. but like i said it's only goin to get warmer and the 150's are too rich
 
yes, you can run 145's in the pto/center and 147.5 in the mag for 30 plus degrees ferenheit. I think you ment 147.5 instead of the 147.8 that you typed.
 
I'm not going to argue the point that with the 165# it would run rich or not I know that if the vent line was not put on with those jets it would run like you said. I myself was going to unplug vent and go leaner in 2003 but said the heck with it because it runs good like it was 162.5 across the boards my temp and elevation. What are you getting for mpg mopar1rules just wondering if it made that much of a difference I hope you don't mind me asking because I always wonder what if. THANX!!!
 
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