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Old 06-19-2014, 09:53 PM   #1
holycost
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jetting problem seeing if anyone has any effin idea

Ok so I have an 02 Kawasaki zr7. I added a d and d muffler, k and n filter, and irridium spark plugs. I took it to a shop to add the dynojet kit. Before jetting I could go about 180-195 before hitting reserves and the plugs all had the same amount of build up on it.

At first we put the weaker springs, went a size bigger on main jets, two washers on the 3rd setting on the jet needles. Was running waaaaay to rich. All the plugs were black and was only geting around 100 miles before deserve. Took it back they put original springs back in the car a and was better. Got around 120 miles before reserves. The plugs in 3 and 4 were slightly black and 1 and 2 were pretty black.

About a month ago I left the two washers and moved the jet needles up a notch to lean ot out. Plugs 3 and 4 were a good color acceptable color but 1 and 2 were black but not enough tk foul them out. I am now getting about 140 miles before deserve. What can I check to see why those two plugs are still black? They are not kn the same circuit so I don't know why those both are still black. I don't wanna moves the needles as I think 3 and 4 would be too lean. I'm thinking about switching the needles in 1 and 2 with 3 and 4 just to make sure the needles weren't machined right and having my air fuel mixture adjusted as I haven't since leaning the carbs out a little. Was also gonna replace the idle jets in 1 and 2 to see if it would work. There is a slight hiccup when giving it a little gas. Maybe at like 10-15% throttle which makes me think its the idle jets either up or too big. The shop did not change idle jets I believe.

Any ideas would be appreciated. Also my muffler is nice and black.
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Old 06-19-2014, 10:12 PM   #2
Patrick
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What's your fuel screws set at? 2 turns out is a good beginning base line.
With a K&N and a slip on you should be at 104 mains, 3 notch from the top on the needle and no washers.
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Old 06-19-2014, 11:00 PM   #3
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I'll have to ask it was maybe 3 or 2.5 getting a lot of popping right now. Also I thought the washers were a half step so having two washers and second notch from top would be the same as no washers and 3 notches from top ill have to ask what mains they put in. They kinda just followed dynojegs recommendations which is why it was so rich the first time
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Old 06-19-2014, 11:38 PM   #4
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I get what your saying about the needles and mains but why would only one carb on different circuits be rich? Shouldn't the inside carbs run richer than the outer ones?
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Old 06-20-2014, 07:35 AM   #5
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Could be a lot of things including; improperly adjusted fuel screws, a dirty air jet circuit or a synch issue.
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Old 06-20-2014, 08:04 AM   #6
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kinds sounds like its bot synced correctly
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Old 06-20-2014, 10:23 AM   #7
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Well the fuel screws could be out of adjustment since I did adjust the needles and I did not resynch carbs either, gonna swing by there later and have them adjust a few things and pick up a screw driver so I can adjust those screws myself. If my idle is steady at 1100 though and no noticeable lagging or dropping below 1100 when I rev, doesn't that mean the fuel screws are still ok?
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Old 06-20-2014, 12:07 PM   #8
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No, it doesn't.
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Old 06-20-2014, 03:52 PM   #9
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Ok ill resynch and update
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Old 06-23-2014, 09:38 PM   #10
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Carbs wefe already synched, fuel screws are out 3 turns which was good before I adjusted needle jets.

The needle jets were originally at 3 from top with no washers with 104 main jets.

Bike was way too rich so they kept the main jets, put the washers in and I adjusted needle jets to second notch.

Bike is still rich on 1 and 2 and exhaust. I'm thinking of going back completely stock with new idle jets and main jets just to see what is going on.
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Old 06-26-2014, 01:50 AM   #11
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Anyone have anything? Figured there would be someone knowlefable on this stuff on here
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Old 06-26-2014, 05:34 AM   #12
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Take it apart order another head gasket check and see if ant valves were bent and redo it again. Triple check everything. Or better yet save up a little coin and take it to a shop.
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Old 06-26-2014, 06:40 AM   #13
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Now that you've verified your jetting let's move to other possibilities
If it's just 2 plugs getting black than more than likely the issue is isolated to those two cylinders.
Check your float height.
Check you spark plug wire connection as it goes into the cap. Is it corroded? Is it tight?
Measure the caps resistance.
What plugs are you running?
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Old 06-27-2014, 01:01 AM   #14
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Dr9ea I believe the ngk irridium, float level is 17.5mm which stock spec is 17mm. I'll have to check the wires as they are probably original and have about 23k on them as far as the caps. What are you referring to?
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Old 06-27-2014, 08:00 AM   #15
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Spark plug wire caps. Basically what screws into the wire and then connects to the spark plug.
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Old 06-28-2014, 02:30 AM   #16
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K ill have to check it out
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