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Discussion Starter #1
I purchased a Dynojet kit for my Predator and before I attempt to install the jets and all I would like a breakdown of the carb. The only thing I have is the service manuel that I made a copy of from off of the Polaris site. I went to the mikuni site and they do not have anything on the 42MM BSR carb. Does anyone know where I can find any info????
 

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Mostly Harmless
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Did the Dynojet kit include any instructions? Heck, where did you get this kit, and what's the Dynojet part number? I want one!

I can give you a brief walkthrough on getting to the carb and changing the jets... I've done it twice on mine already. It's VERY easy... easier than any other quad I've ever worked on.

Rob
 

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Hi guys,

Just make sure that you have an impact tool to remove the screws from the carb bowl, and the vacuum diaphram on the top of the carb. The screw that holds the carb to the rubber intake boot is also very soft...as are all the carb related screws...Typical SOFT Japanese screws!!!

As many times as I've had this thing apart to try and get the jetting right, all of these screws are just about buggered up...even using the right tools and trying to be careful. So save yourself some time, and get a set of these replacement screws before you even start! I found a great place to get replacement screws for the carb, though...Try your local NAPA parts store...Part # 81661 is a 4mm x10mm .70 pitch metric hex head screw that should fit the carb bowl, and Part # 82057 is a 4mm x 25 .70 pitch screw, with standard phillips head, that should fit the carb clamp...I bought a bunch of them today for only $6.00....so now I have some spares...

Rob, I ordered the Dynojet jet kit yesterday...the reason I went with it was the fact they set it up to work with a slip-on K&N filter as a Stage III mod...and this is what I wanted to do from the start...It is far cheaper ($57.00)than what else is pending out there, and I like the fact they did a lot of R&D on the needle. I have always had good results with Dynojet on past jettings, even on multi-carbed 4's.

I'll let you all know how the next, and hopefully FINAL re-jet operation goes, as soon as I get it done...

JJ
 

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Mostly Harmless
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JJ:

What's the DynoJet part number for their kit? I'll have my dealer order one for me, since I have some credit there.

Rob
 

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Rob,

Sorry, I didn't even note the number...I phoned in the order directly to Dynojet...I have seen it posted by several people on some other forums...I just don't recall what the number is...It's so new it is not yet listed on the DJ web site, either... Maybe Jericho from the start of this thread has the #'s

JJ
 

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Discussion Starter #6
Dynojet. 1-800-992-4993, kit # Q518. I will be getting mine tuesday. That kit comes with a stage 1 and stage 3 kit. The guy told me the directions were clear and easy to follow.
 

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Hi everyone,

I got my DJ kit in today, and it seems to be a nice, complete kit. Has LOTS of jets to choose from, and a new needle. No modified slide spring, as they apparently found they don't need one....it may help some of you to read the info sections on the DJ website...it really explains the basics of the jetting process...

I'll put it in later tonight, and test it on Friday in the morning. I'll keep you all posted on the results....


JJ
 

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K&N part #RU-1770
Outerwears part #WR125-6T

I suggest ordering it from Summit Racing Equipment or any other dealer that carries K&N filters. Though Summit may not have the Outerwears, so then again, maybe Rocky Mountain ATV instead.

Rob
 

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My DynoJet kit arrived today and I just finished installing it. It went smoothly, since I had already removed the annoying screws from the bottom of the carb and replaced 'em with hex-head screws.

Per the instructions, I installed the DJ146 jet since I run a pipe and am between 3000-5000'. It said that for elevations 3000-5000' to set the AF screw to +3 turns. Since I ride between 4000-5000', I set it to 2.75 turns.

I think I'll order up that filter they recommend and give it a try too...

Rob
 
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