air pilot jets

This board is for all the, '"Typical stuff" you should know.
jimcox145
Tricycles are Cool
Posts: 7
Joined: Sun Mar 05, 2017 11:18 pm
My Bike: 1997 Suzuki intruder 1400
Status: Offline

air pilot jets

Postby jimcox145 » Tue Mar 21, 2017 2:16 pm

I am rebuilding both carbs 97 1400 intruder. someone tinkered with it and had main jets reversed. so I checked all jets and found the rear air pilot jet is supposed to be 1.55 and it is in fact 1.65. with that have adverse effect ? all others are correct stock # specified.

old time rider
BIKE REPOED!
Posts: 2868
Joined: Tue Dec 09, 2014 5:07 pm
My Bike: 650Vstrom
Status: Offline

Re: air pilot jets

Postby old time rider » Wed Mar 22, 2017 6:27 am

Never had the carbs off my 1400 in 45,000 but did do lots of jet changes in ten years of drag racing.Leaner is meaner you learn fast at strip.Lots think the more gas you throw in the better.Intake and out let need to be more flow to need more fuel.It will help them sometimes on starting and other side of too lean is a burnt piston :eek: .As far as hurting it I don't think so but lots better wrenchs than me on this board by a long shot. Good luck. :cheers:

jimcox145
Tricycles are Cool
Posts: 7
Joined: Sun Mar 05, 2017 11:18 pm
My Bike: 1997 Suzuki intruder 1400
Status: Offline

Re: air pilot jets

Postby jimcox145 » Wed Mar 22, 2017 9:09 am

I bought bike used a month ago and knew from the start that there were issues. Everything is stock with the exception of that rear air pilot jet. I am keeping it all stock till next winter. I am adjusting floats today and reassembling bike this afternoon. Fingers crossed.

navigator
Joined a 450cc Club
Posts: 788
Joined: Thu Dec 29, 2016 12:33 pm
My Bike: VS800
Status: Offline

Re: air pilot jets

Postby navigator » Wed Mar 22, 2017 9:17 am

You know you will need a re-sync right?

User avatar
WintrSol
Passed the Circle Test
Posts: 392
Joined: Fri Feb 26, 2016 2:02 pm
My Bike: CB450 GL1500CT
Location: Near St. Louis, MO
Status: Offline

Re: air pilot jets

Postby WintrSol » Wed Mar 22, 2017 11:03 am

The rear carb is tuned richer than the front, probably because the rear will run hotter. Increasing the size of that air jet will make it a bit leaner in the throttle position between idle and where the needle jet takes control, except during hard decel, when it is cut off. I don't know why you would want it this way, as many complain about pops in the exhaust in this range, and leaning it should make it pop more. Unless it was tuned with an exhaust sensor on a dyno, I wonder why someone installed it?
Florissant, MO
CB450K3, GL1500CTValkyrie

User avatar
Fred
Joined a 950cc Club
Posts: 2300
Joined: Tue Dec 02, 2014 12:08 am
My Bike: VS 1400. Royal Enfield
Status: Offline

Re: air pilot jets

Postby Fred » Mon Sep 04, 2017 9:26 am

The Bs 36 Mikuni has 2 air jets, one of them is closed off by the coasting valves to richen the mixture to stop popping at overrun.
1.55 to 1.65 on one jet is nothing. These are agricultural fuel guzzling motors of 700cc per cylinder, competative economy was not in the eye of the designer.


Return to “General knowledge”

Who is online

Users browsing this forum: No registered users and 1 guest