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post #26 of 52 (permalink) Old 7-12-2012, 7:06 AM
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Re: Pilot screw adjustment

I am at 1.25 on mine after starting at 2.5. For my bike 2.5 was very rich from 2-3k with light throttle and I ride in that range a lot. I have not clue if I try to ride fast how it will run since I MPG is important to me.

Mine ran rough on part throttle down low. As I turned it from 2.5 to 2.0 to 1.5 to 1.25 it kept getting smoother. I have been tempted to go to 1 turn but I also don't want to tempt fate.

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post #27 of 52 (permalink) Old 7-12-2012, 8:09 AM
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Re: Pilot screw adjustment

Just out of curiosity, anybody know what the original stock setting was? 1.5 turns out?

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post #28 of 52 (permalink) Old 7-12-2012, 8:09 AM
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Re: Pilot screw adjustment

It almost certain you have something else wrong in your carbs, like float level of leaking float valves. Unless of course you drilled open you pilot jets larger.

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post #29 of 52 (permalink) Old 7-12-2012, 8:25 AM
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Re: Pilot screw adjustment

Quote:
Originally Posted by 00ninja
Just out of curiosity, anybody know what the original stock setting was? 1.5 turns out?
From the factory Mine was like 3/4 turns out on one side and 1 3/4 turns out on the other, they certainly don't match, and its wacky at best, makes no sense except to detune it for epa reasons.



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post #30 of 52 (permalink) Old 7-12-2012, 9:22 AM
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Re: Pilot screw adjustment

Quote:
Originally Posted by FloridaEX500
Quote:
Originally Posted by 00ninja
Just out of curiosity, anybody know what the original stock setting was? 1.5 turns out?
From the factory Mine was like 3/4 turns out on one side and 1 3/4 turns out on the other, they certainly don't match, and its wacky at best, makes no sense except to detune it for epa reasons.
Now that you mentioned it the jet closer to the "horn" was leaner then the other one on my bike.

Thanks!

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post #31 of 52 (permalink) Old 7-12-2012, 9:29 AM
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Re: Pilot screw adjustment

Its important to do this mod to any mc or scooter. I knew about this long before I came here to this forum. Fog did not invent pilot screw tuning. Its not just an ex thing.



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post #32 of 52 (permalink) Old 7-13-2012, 5:09 PM
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Re: Pilot screw adjustment

I'd like to tag on this post. I have a Muzzy pipe, stage 1 jet kit, and K&N exhaust. I have no bottom end under 4k. It sputters until I'm revving high enough. Once it launches, it rides great. Getting off the line is where I have the issue. I'm about 3 1/4 turns out and this is the best it has run. What else should I be looking at?
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post #33 of 52 (permalink) Old 7-13-2012, 5:38 PM
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Re: Pilot screw adjustment

The jet kit is dumping fuel in. your plugs are probably black and wet. i used to have a muzzy. i thought it was awesome at high speeds, my recommendation is to go with all stock carb jetting and needles then tune the pilot screws to 2.25 turns out. That's what i had to do to resolve the fuel dumping issue, and when i did i got pretty darn good performance out of it. My problem was with the continued loud noise all the time with no way to turn it off got on my nerves after a couple of years so i went back to stock and im happy with that setup especially because now i can use a centerstand. But im not trying to talk you out of it, just trying to tell you what i did to get it to run well. Your problem isn't the pipe its the jet kit.



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post #34 of 52 (permalink) Old 7-13-2012, 5:48 PM
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Re: Pilot screw adjustment

Thanks for the input! I'm changing to progressive springs this weekend. I guess I'll re-jet the carbs too! I'll let you know how it works out. I've yet to post pics but I guess it's about time.
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post #35 of 52 (permalink) Old 7-15-2012, 9:02 AM
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Re: Pilot screw adjustment


Quote:
Originally Posted by FloridaEX500
Remember the ex runs lean low and rich high. There is a fine line between too rich and too lean its around 2 turns out with stock exhaust and jetting. anything less than is too lean but if your goal is to save fuel then you may want to go lower than 2 turns. We all assume you want to go fast so go with 2- 2 1/4 turns, somewhere in there assuming your exhaust is stock. Then you should ride the bike different speeds and acceleration levels to test what you end up with, when you are happy with the performance then you're done. or fly fog over and he'll do it in your driveway in about 20 seconds.lol
+1 lol

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post #36 of 52 (permalink) Old 7-17-2012, 10:26 PM Thread Starter
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Re: Re: Re: Pilot screw adjustment

Quote:
Originally Posted by FOG
It almost certain you have something else wrong in your carbs, like float level of leaking float valves. Unless of course you drilled open you pilot jets larger.

FOG
OK so I finally did the float valve test with the carbs out shutting on a sheet of paper with a external fuel source and there was 0 leak. I let them sit for about 2 hours. Can you think of any other reason I would have such a strong smell of fuel coming out of the exhaust?

Could spark plug wires have anything to do with it?

Thanks in advance

Josh

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post #37 of 52 (permalink) Old 7-18-2012, 11:21 AM
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Re: Pilot screw adjustment

It wouldn't hurt to check the plug wires. I had a rather bad stalling problem at the beginning of the season caused by the wires. Check carefully inside the boot that goes over the plug. One of mine was cracked and the little metal ring was missing causing an intermittent spark problem.

Don't know if it's related to your problem but it's easy to check and rule out.

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post #38 of 52 (permalink) Old 7-18-2012, 12:14 PM Thread Starter
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Re: Re: Re: Pilot screw adjustment

Quote:
Originally Posted by 00ninja
It wouldn't hurt to check the plug wires. I had a rather bad stalling problem at the beginning of the season caused by the wires. Check carefully inside the boot that goes over the plug. One of mine was cracked and the little metal ring was missing causing an intermittent spark problem.

Don't know if it's related to your problem but it's easy to check and rule out.
I think I am going to replace the spark plug cables. Is there a set from amazon I can buy or do I have to use eBay. The local shop in my town only sells them separate and I don't know how to assemble them.

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post #39 of 52 (permalink) Old 7-18-2012, 2:36 PM
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Re: Re: Re: Pilot screw adjustment

Quote:
Originally Posted by jh_husker
Quote:
Originally Posted by 00ninja
It wouldn't hurt to check the plug wires. I had a rather bad stalling problem at the beginning of the season caused by the wires. Check carefully inside the boot that goes over the plug. One of mine was cracked and the little metal ring was missing causing an intermittent spark problem.

Don't know if it's related to your problem but it's easy to check and rule out.
I think I am going to replace the spark plug cables. Is there a set from amazon I can buy or do I have to use eBay. The local shop in my town only sells them separate and I don't know how to assemble them.

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There are sets on eBay but I'm not sure if Amazon has any (I've never used Amazon). The shop where I had my bike to diagnose the problem got a set of NGK wires. I'm not sure if they came assembled or not but they were only $20CDN.

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post #40 of 52 (permalink) Old 7-20-2012, 1:31 PM Thread Starter
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Re: Re: Re: Pilot screw adjustment




Can you think of any other reason I would have such a strong smell of fuel coming out of the exhaust?



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post #41 of 52 (permalink) Old 7-24-2012, 9:29 PM
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Re: Pilot screw adjustment

Josh,

Have you had the tops of the carbs? If one of your slides, or needles is being held up, this would cause a rich condition. If someone had it apart and was not careful about getting the needle into the needle jet, this could be the cause of the problem. Many years ago, I loaned a needle to a friend and it came back bent. Stranger things have been known to happen.

Take a paper towel, fold it like a handkerchief, and place it behind each of the exhaust outlets while you rev the bike up. If you see black soot, that is unburned gas. If it is only on one side, that side is the source of you fuel consumption. If it shows up on both, both sides are rich.

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post #42 of 52 (permalink) Old 7-24-2012, 10:23 PM Thread Starter
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Re: Re: Re: Pilot screw adjustment

Quote:
Originally Posted by PeterJ
Josh,

Have you had the tops of the carbs? If one of your slides, or needles is being held up, this would cause a rich condition. If someone had it apart and was not careful about getting the needle into the needle jet, this could be the cause of the problem. Many years ago, I loaned a needle to a friend and it came back bent. Stranger things have been known to happen.

Take a paper towel, fold it like a handkerchief, and place it behind each of the exhaust outlets while you rev the bike up. If you see black soot, that is unburned gas. If it is only on one side, that side is the source of you fuel consumption. If it shows up on both, both sides are rich.

PeterJ
Thanks so much for the feed back. I don't need a paper towel to answer this. If I rev the throttle hard I get puffs of black smoke coming out of both pipes. I have taken the carbs apart three times already so it is becoming very frustrating that I can't find the problem. I will check to see if the needle is bent. Thanks

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post #43 of 52 (permalink) Old 7-24-2012, 10:45 PM
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Re: Pilot screw adjustment

Josh,

Not just bent! Make sure the slides are going down all of the way and the needles are all the way down. Do the springs look O.K?

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post #44 of 52 (permalink) Old 7-24-2012, 10:48 PM
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Re: Pilot screw adjustment

Josh,

Check the carb parts diagram here. Are your needles (16009) under the plastic holders (16007)?

http://www.ronniesmailorder.com/fich...2004&fveh=8549

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post #45 of 52 (permalink) Old 3-29-2016, 5:10 PM
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Re: Pilot screw adjustment

Hi guys, sorry to bump an old thread but I am having difficulty finding any flathead screwdriver small enough to fit in the space. I am just using a flathead piece with my fingers, but it's a lot harder than a screwdriver to estimate how many turns and get any accuracy. Anyone know where to get a good screwdriver for this job?
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post #46 of 52 (permalink) Old 3-30-2016, 6:44 AM
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Re: Pilot screw adjustment

Sears sells a little finger driver, a disc like thing that holds any 1/4 inch bit, not only does it fit perfectly but you can make a mark on the outer edge so you can easily count the turns. It also fits in your pocket so you can make on the road adjustments if you want.

Other than that any small screwdriver should fit, they make it that way so anyone can adjust them easily with the smallest of tool sets





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post #47 of 52 (permalink) Old 3-30-2016, 8:58 AM
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Re: Pilot screw adjustment

I ground down the end of an Allen wrench into a flathead shape. The right angle makes it really easy to count turns, and I somehow always have extra Allens in sizes I don't need.

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post #48 of 52 (permalink) Old 3-30-2016, 5:49 PM
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Re: Pilot screw adjustment

finger held, from a bit set

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post #49 of 52 (permalink) Old 3-31-2016, 2:03 AM
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Re: Pilot screw adjustment

Quote:
Originally Posted by Kezzer
Hi guys, sorry to bump an old thread but I am having difficulty finding any flathead screwdriver small enough to fit in the space. I am just using a flathead piece with my fingers, but it's a lot harder than a screwdriver to estimate how many turns and get any accuracy. Anyone know where to get a good screwdriver for this job?
Like the ones Duc posted but instead, use the bits that are longer... the kind used in battery operated impact guns.

Wrap some electrical around the end to give you a little thicker grip and paint one side so you can count the turns.

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post #50 of 52 (permalink) Old 5-1-2017, 2:08 PM
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See if your fuel petcock's gaskets are in good shape. I had this same issue and couldn't find the cause in the carbs anywhere and eventually realized that fuel was getting pulled into the carb through the vacuum line to the petcock. Rebuilt the petcock with new gaskets and the fuel smell went away and the bike runs so much better.
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