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Discussion Starter · #1 ·
this is what i have 07 660 rhino/clutch sheave/cdi box/k&n air filter no lid/slip on biggun. at low rpms iam getting a pop though the intake. there is a 55 jet and a 170 in it right now with 2.5 truns out on a/f screw. what to do? its driving me crazy when putting a round camp and all you here is pop pop!!!!!
 

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The 55 is the choke jet...it is irrelevant...

Did you jet it yourself...and did you get a dynojet kit...and does it have the stock needle or a dynojet needle...

Or is that 170 a mikuni that you or someone else put in and that is the only main jet you have...
 

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One question why mess with the air screw why not just play with the jeting
 

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He is correct for adjusting the idle a/f screw...which is a fuel adjustment...2.5 turns out is okay for stock pilot jet with stock needle but not as good as larger pilot jet...

A 45 pilot jet in place of the stock pilot jet will allow someone to not have to unplug and adjust the idle a/f screw and is way better than the stock pilot but not the best one IMO...

We sell the correct and best jet kit for the 660...and pilot jets...mini jet kits...individual mikuni jets...
 

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Hey hillbilly...

What brand CDI do you have...

You know that problem can be caused by exhaust leak, valve adjustment, and bad ignition...

But most of the time it's jetting...and if you have the stock pilot jet with a dynojet needle that is 99% likely the problem...

Our complete jet kit is what you need imo...and best if you have the stock needle...
 

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stock is 40...my kit includes a 45 and a 50...

if you didn't tune the carb yourself who picked your 170 and is it the only jet you have...
 

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Just order the jet kit and you will be fine...

It will have everything you need to properly jet the carb...

Then only way it doesn't fix the problem is if you have something like a cracked head pipe or something...

99% of the time it's jetting...

You have a high flow intake...that is good...
 

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Hillbilly, when you say there is a washer on top and bottom of the needle what thicknesses are they. As memory serves me there was a thin and a thick. When the engine is popping through the intake it is generally a lean condition. Low speed jetting can also be controled by the needle height. See if the thick washer is under the needle clip. If not, try swapping it so it is there. Also hitting on the jets that are in it, How did you come to these settings. Was it like that when you got it? If you are unsure of the setup I would verify the jets that are in it (including weather they are Mikuni or Dynojet as the sizing is different). Once you know that go to engine forums section and find the sticky on jetting. It has a ton of good info to help you set up your carb.
 

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Discussion Starter · #19 ·
the thin one is on the bottom fat on top . i will switch them. i got it with the jets in it already. idk how to tell them apart .
 

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It can be hard to distinguish the jet maufacturer, but I want to say the Mikuni jetshave a small M stamped on them. One question would be, is how does the motor run when wide open? If that is good I wouldn't worry too much about the main and focus on the needle setting.
 
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