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Opinions as to which Main Jet to try with my JD: #160,#162, or #165

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I was able to pick up a red 'high altitude' JD needle from a TT member(thanks btw)... and now I am trying to decide which Main Jet to install for my setup. I would hope to only have to try one.

Here are the main jet options I need to choose from: #160, #162, and #165

Current Bike Specs:

I ride a 2001 DRZ-400E.

Snorkel Removed

Stock Pilot Jet

Kientech Fuel Screw

White Bros E-Series slip on muffler without the quiet core

I live in Utah at 4500 ft and ride from 4500 - 9000 mostly.

The JD instructions suggest with the Red Needle "Install the #160 Main jet for riding for riding 6000ft to 9000ft elevation AND use the RED marked needle in the middle clip position (#4)"

There is another note on the JD instructions "A 165 Main jet is provided for more open exhaust and any other airbox modifications"

So I am somewhere between 160 - 165. but it seems the clip position stays the 4th

I would hope Eddie chimes in... but I am open to people who have dealt with a similar setup in the similar altitude.

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I have originally planned on the #160 Main... since the White Bros E-series slip on isnt too much of an open exhaust with its baffle system.

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150 main jet.

Not to question your expertise, but more to help educate me on jetting, why did you choose the 150... I think the instructions even suggest a 155 for riding over 9000 with the clip in 3rd position. Please dont take offense... I just like to know the reasonings behind things.

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becuase you need to have a 10% leaner main jet for your altitude.

keep in mind i tune bikes for a living at high altitude.

but as usual,do what you feel is best.

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becuase you need to have a 10% leaner main jet for your altitude.

keep in mind i tune bikes for a living at high altitude.

but as usual,do what you feel is best.

I feel best with your suggestions Eddie... I just sometimes like a little reasoning so I can get a little education myself. Thanks for your reply.

I hope to have this done by next weekend. I'll post up my results when I do.

My bike/carb specs should then be:

2001 DRZ-400E

typically riding 4500 - 9000ft

Airbox Snorkel Removed

150 Main Jet

stock Pilot Jet

JD Red Needle 4th clip (middle position)

Kientech fuel screw 2.5 turns

White Bros E series Slip on muffler

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