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Dynojet jets vs mikuni jets

By canadasax,
in DRZ400/E/S/SM

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canadasax

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I was reading through some old posts and this one confuses me a bit

https://www.thumpertalk.com/forum/showthread.php?t=494496

I always thought that the mainjet number was a universal number, such as a mikuni 150 mainjet was the same as a dynojet 150 mainjet.

I need to get a 150 mainjet for my dynojet stage1 kit. Can I just phone up the local suzuki store and order a 150 main jet for a 2008 DRZ400s.

Sorry if this information has been beat to death, but I couldn't find anything except for the post a made a link to.

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canadasax

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I guess you did.....It just seemed that the post preceding your answer was contradicting what you were saying.

You are saying that regardless of the hole size, the airflow will be close enough to the same with the same number.

I really do appreciate the information that you have given this forum.

Ken

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OzWizz

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Hey...no fair...you changed your answer :worthy:

(Well, yeah, obviously you need the DJ one)

And I still didn't get it right!?

I meant "yeah, IF you need the DJ one"!!

Please excuse the brainfart - I've crawled back in my box now!:banghead:

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PBMW

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thats right,more to jets than just the hole size.

but as it pertains to mikuni vs dj jet they can be interchanged.

There certainly is more to jets than the dia.

A quick question though...

Are you talking about DJ jets being near identical to Mic jets in A/F in regards to DRZ motors or in general?

I have a bit of experience tuning FZR1000 motors and have found the opposite. I had not known there was a "conversion chart" from DJ to Mic.

In fact, I've measured DJ 124 jets from one model specific jet kit to another different kit that calls for a DJ 124 jet and found them a different dia.

Interesting thread though....

Your thoughts would be appreciated.

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PBMW

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Thanks for that.

I haven't played with DJ jets in a long time. There are others that are much better.

In my experience, DJ kits make a big Japanese four cyl run falling down pig rich.

early dynojet jets were horribly in consistent.

a modern dynojet 150 jet will have the same actual measured a/f ratio as a mikuni 150 main jet.

the conversion chart is bunk.it only compares hole size which isnt really the whole story.length of the hole,taper in and taper out affect the flow.

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PBMW

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I've run both.

I have a 95 that has a 1040 kit, ported heads, +1mm Manley valves, stage one DJ, K&N in a stock airbox and a SSR2 slipon.

DJ said to use the air correctors in the pilot air jet. I've found you should not. Runs "ok" with the smallest jets in the kit, and the needle in #1 or #2 depending on elevation and temps.

I advance the EXUP valve three turns on the adjuster also.

Mine made 128 stock and 152 after on Mike Valasko's dyno.

I had him make me a 4/2/1 header with a Graves can on it, Web long course cams, springs and shim stacks, 41mm FCR's, a set of coils, and made some more port work made 178 on Mikes dyno.

It ran 9.84's @144 pretty consistantly with 1.3 short numbers

I'm hopeing it will get into the 9.3's.

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