Jet Sizes For Different Setup's

I acquired this 800 jet size guide from somewhere on the net a year or two ago, so I can't give them credit sadly as I have forgotten where .....


Stock pipes (baffles or debaffled) & stock airbox:
128 or 130 main, 30 or 32.5 pilot jet, dyno spring, dyno needle on 3rd notch, mix screw at 2.5 - 3 turns. Adjust idle knob as needed to reach 1100 rpm.

Aftermarket pipes (baffles or debaffled):
132 main, 32.5 pilot jet, dyno spring, dyno needle on 3rd notch, mix screw at 2.5 - 3 turns. Adjust idle knob as needed to reach 1100 rpm.

Aftermarket or stock pipes (baffles or debaffled) & Uni filter or K&N (airbox mounted):
150 or 155 main, 37.5 pilot jet, dyno spring, dyno needle on 3rd notch, mix screw at 2.5 - 3 turns. Adjust idle knob as needed to reach 1100 rpm.

Aftermarket or stock pipes (baffles or debaffled) & K&N (carb mount):
155 or 160 main jet, 40 pilot jet, dyno spring, dyno needle on 3rd notch, mix screw at 2.5 - 3 turns. Adjust idle knob as needed to reach 1100 rpm.

Aftermarket or stock pipes and Hypercharger airkit:
142 main jet, 45 pilot jet, dyno spring, dyno needle (for Thunder kit) on 3rd notch (Thunder says 2nd notch, but no one has had this work well), mix screw at 2.5 - 3 turns, plugged air jet. Adjust idle knob as needed to reach 1100 rpm.


Mikuni - DynoJet Size Comparison Chart

Left side is Mikuni, right side is Dynojet

140.0=149.3
142.5=152.0
145.0=154.7
147.5=157.3
150.0=160.0
152.5=162.7
155.0=165.3
157.5=168.0
160.0=170.7
162.5=173.3
165.0=176.0
167.5=178.7
170.0=181.3
175.0=186.7
177.5=189.3
180.0=192.0
182.5=194.7
185.0=197.3
187.5=200.0
190.0=202.7

after market pipes uuummm id like those but id really like carb mounted air filters good to dream ay

A lot of pleasure comes from dreams.

Yeah, especially wet ones

had to lower the tone but i dont seem to get many though

Well in Dave,this info will help a lot of people,and save them guessing or getting ripped off.

Agreed, this sort of info is a god send because it takes out the guess work and having to do the job several times until you get it right.
Jets are cheap so you can always buy a couple either way of what you think it might need but the bloody haste if keep stripping down when it's wrong is a serious pain in the arse and takes so bloody long.
Good one Dave