June 23rd, 2015, 01:02 PM | #1 |
ChocolateMilk Addict
Name: Maurice
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More carb questions?
This Ninja i have is outfitted with a muzzy exhaust system, and It hasn't been rejetted, any idea/recommendations as to what setup would be ideal?
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June 23rd, 2015, 02:22 PM | #2 |
Rev Limiter
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How does it run now? Are the idle mixture screws accessible?
If it runs decent now, I would start by fine-tuning the low and midrange. Typically, the idle mixture is set lean, so going to a setting of 2 1/2 turns out gets you better idle and transition to midrange. If you make a significant adjustment you will most likely need to move the idle speed back down to the correct setting of 1300 RPMs after making the mixture adjustment. The needles are usually also on the lean side, and adding shims to lift them slightly gives you better throttle response and acceleration in the 50% throttle range. If it pulls cleanly and strongly through the midrange (50% throttle opening) and continues to pull strongly into the WOT range the main jet is pretty close. Know that when you roll the throttle wide-open it takes time for the slides to lift, so you need to be full-throttle for a few seconds before you are actually "wide-open" and can determine if the main jet is the proper size. Stumbling, stuttering, or falling flat as you get into the main jet will tell you you need to make adjustments. Most often, too rich will give you a stumble/stutter/popping and too lean will give you a flat/bog/hesitation. You can also look at your spark plugs to give you some indication of your overall mixture. Optimum is a light tan color. |
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June 23rd, 2015, 03:03 PM | #3 |
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Jetting is also affected by airbox mods. Are you running a stock airbox?
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June 23rd, 2015, 04:02 PM | #4 |
ChocolateMilk Addict
Name: Maurice
Location: McDonough
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When I'm below about 6k there is a stutter, like jerkiness, but when i get higher she's butter on biscuits, and i am running stock airbox
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June 23rd, 2015, 04:16 PM | #5 |
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2.5 turns on idle screws . Balance the carbs from there
40 pilot 110 main 0990 air filter ,at least till your jetting is sorted. Maybe 108 mains Go one hotter on the plugs Ride see how it does
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June 23rd, 2015, 04:38 PM | #6 | |||
in your machine
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Keep OEM airbox, go get a K&N tune pilot screws per the write-up below,
Quote:
Quote:
Quote:
Jetting is a hit and miss unless you have access to an exhaust gas analyzer.
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June 23rd, 2015, 04:59 PM | #7 |
ChocolateMilk Addict
Name: Maurice
Location: McDonough
Join Date: Mar 2015 Motorcycle(s): '05 EX-250 "Kallie" 85 KLT 110 ATC "Murdock" Posts: 329
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Not sure, its got the 2 in 1 header on it. if that matters. i got the bike used so I'm not so sure of everything
Sidenote, oil puddles under the bike when left for a couple hours, nothing major. open to solutions though. |
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June 23rd, 2015, 05:15 PM | #8 |
in your machine
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Full muzzy system then.
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June 23rd, 2015, 06:07 PM | #9 |
ChocolateMilk Addict
Name: Maurice
Location: McDonough
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Ok, thanks for the info bro
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June 23rd, 2015, 07:26 PM | #10 | |
Rev Limiter
Name: Jay
Location: WI
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Quote:
As far as carb adjustments go, you need to think in terms of throttle opening - not RPM. You can be at 9,000 RPMs and 1/4 throttle or 4,000 RPMs and full throttle. The carb is operating on completely different circuits, and the RPMs are not the deciding factor. To cure what you are experiencing, do what I suggested in my previous post concerning idle mixture adjustment and needle shims. |
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June 23rd, 2015, 07:33 PM | #11 |
in your machine
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I agree with Jay, just follow the guides above, and then see if a jet kit is needed, the washers under the main needles is a cheap and easy modification, less than $1.00 for 4 = 4mm washers
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June 23rd, 2015, 08:21 PM | #12 |
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June 23rd, 2015, 08:25 PM | #13 |
in your machine
Name: Scott
Location: Summer Shade, Ky.
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I picked mine up at my local Ace Hardware, I even got the stainless steel ones
The size needed is 4mm.
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September 21st, 2015, 07:26 PM | #14 |
ChocolateMilk Addict
Name: Maurice
Location: McDonough
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Sorry for the bump, but my issues persist, i took it for its first ride above 45mph today. While riding i noticed if i hold the throttle still, the bike'll jerk a little, like uneven throttle response or something, I'm gonna make this my main vehicle, so i gotta get her running fine. also, how would i get under the carbs to adjust the screws while its running? i can't seem to fit anything I also only noticed this higher up in the rev range, also, as previously stated, i have a muzzy full system if that point to anything. Need all the help i can get, thanks guys.
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September 21st, 2015, 07:52 PM | #15 |
in your machine
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Adjusting the idle mixture only effects the throttle position to about 1/4 open,
If you look at this write-up, http://faq.ninja250.org/wiki/How_do_...dle_mixture%3F pay attention to the bottom of it, they have some ideas about tools to fit. Another thing to check is the chain adjustment, if too much slack, it will cause the feeling of surging sometimes. If your in need of carburetor services PM @ducatiman
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September 21st, 2015, 07:54 PM | #16 |
ChocolateMilk Addict
Name: Maurice
Location: McDonough
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ok, thanks Ghostt, does he give tips for free?
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< ATGATT > Sweat you can wipe off, Road rash you can't. Burn Rubber, not your Soul. |
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September 21st, 2015, 08:08 PM | #17 |
in your machine
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Depends, PM him you also could be in need of jetting, and/or shimming the needles.
Here's some more information about the subject, http://faq.ninja250.org/wiki/How_to_...roper_main_jet. http://faq.ninja250.org/wiki/Intake http://faq.ninja250.org/wiki/Why_wou..._my_jetting%3F But if you don't access to a exhaust gas analyzer then it's just a guessing game, fortunately the modifications that have been done to the bike I'd fairly common, so someone has the proper information about the jetting.
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violente et ignorantia ZX-2R BLOG Twitter and Instagram = Ghostt_Scott I'm not here to change your mind, just to inform. |
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September 22nd, 2015, 06:49 AM | #18 | |
Rev Limiter
Name: Jay
Location: WI
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Quote:
Did you shim the needles? What main jet are you running? Do you have pod filters? Isolating the issue will depend on the throttle position where it occurs - is it 1/4, 1/2, 3/4? Surging and flattening-out is typical of a lean condition, but a stumble/stutter or popping usually indicates rich. Chances are it's lean if you haven't shimmed the needles. |
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September 22nd, 2015, 07:52 AM | #19 | |
ChocolateMilk Addict
Name: Maurice
Location: McDonough
Join Date: Mar 2015 Motorcycle(s): '05 EX-250 "Kallie" 85 KLT 110 ATC "Murdock" Posts: 329
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Quote:
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< ATGATT > Sweat you can wipe off, Road rash you can't. Burn Rubber, not your Soul. |
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September 22nd, 2015, 09:07 AM | #20 | |
Rev Limiter
Name: Jay
Location: WI
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Quote:
The Idle Mixture Adjustment won't help in that range. It's only controlling the mixture during idle and slightly above. When you are experiencing what appears to be carb problems, think in terms of the throttle opening and not RPMs. We need more info. Are you using pod filters? What Main Jet is in it now? What are the mixture screws set at now? Have you shimmed the needles? Are you sure the fuel is good? What fuel do you run? |
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September 22nd, 2015, 09:15 AM | #21 |
ChocolateMilk Addict
Name: Maurice
Location: McDonough
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i've never been wide open, mostly near 3/4 and thats where it is
Stock Airbox Stock Main Jet 2.5 turns fresh fuel 91oct from bp up the street (i know i know, no benefits, i feel like there is, probably the placebo effect to jack a poor teens money)
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< ATGATT > Sweat you can wipe off, Road rash you can't. Burn Rubber, not your Soul. |
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September 22nd, 2015, 09:18 AM | #22 |
ChocolateMilk Addict
Name: Maurice
Location: McDonough
Join Date: Mar 2015 Motorcycle(s): '05 EX-250 "Kallie" 85 KLT 110 ATC "Murdock" Posts: 329
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Could i take off the dual inlet plate on the airbow to increase air flow? that seems like it would help if I'm running rich....
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< ATGATT > Sweat you can wipe off, Road rash you can't. Burn Rubber, not your Soul. |
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September 22nd, 2015, 10:13 AM | #23 | |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
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Quote:
You really need to know how it's running wide-open to make a decision on what needs to be done, but for starters i would search around to find what others have settled on for a Main Jet with your set-up. Have you shimmed the needles? Run regular 87 - no ethanol if you can get it. Changing from gas with ethanol to gas without ethanol will make a bike with carbs run richer. |
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September 22nd, 2015, 11:16 AM | #24 |
ChocolateMilk Addict
Name: Maurice
Location: McDonough
Join Date: Mar 2015 Motorcycle(s): '05 EX-250 "Kallie" 85 KLT 110 ATC "Murdock" Posts: 329
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Ok, ill try that, and no needle shims, i thought that'll run richer, and i figured that could be my issue, but i just got grounded ( i know **** me right?) so ill get back to you in a couple days
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September 24th, 2015, 11:39 AM | #25 |
EX500 full of EX250 parts
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http://factorypro.com/tech/tech_tuni...m_engines.html is a good guide for the basics of carb tuning. It'll show you which parts control fueling in which ranges, and what order to tune them in (so you're not going in circles changing things after you change other things).
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October 2nd, 2015, 12:04 PM | #26 |
ChocolateMilk Addict
Name: Maurice
Location: McDonough
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Ok, update time, i yanked the snorkel, and she still runs rich, i got in a couple full throttle runs and pulled the plugs afterwards (hot as hell, watch your fingers) and found they were wet and black, also, she smells like a ATV, so I'm sure of its richness, how do i make it run leaner?? new jets i suppose??? where do i even find jets??
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< ATGATT > Sweat you can wipe off, Road rash you can't. Burn Rubber, not your Soul. |
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October 2nd, 2015, 01:33 PM | #27 | |
Rev Limiter
Name: Jay
Location: WI
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Quote:
You need to pull the carbs and go through them carefully. Is it smoking? Does it use any oil? Is the airbox oily? Something isn't right, and I don't think it's the jetting. |
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October 2nd, 2015, 02:00 PM | #28 | |
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Quote:
Main and pilot jets should be marked with numbers. Stock needles are non-adjustable, kit needles use e-clips. Starting point...establish *precisely* what jetting is in the carbs, how far and where it deviates from stock settings. I'd also advise checking the fuel levels as well, make sure the float needles are, in fact, sealing. While you've got them out, confirm the pilot passages are clear....are the orings dried out?...Check slide action...etc etc etc. Always good to have carb "consumables" on hand before pulling carbs of unknown origin. Kits containing orings, float valves, etc. Eliminates downtime waiting for parts. |
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October 2nd, 2015, 02:35 PM | #29 |
ChocolateMilk Addict
Name: Maurice
Location: McDonough
Join Date: Mar 2015 Motorcycle(s): '05 EX-250 "Kallie" 85 KLT 110 ATC "Murdock" Posts: 329
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Well ducatiman, I've seen your work, and will say its tempting, so lemme ask you this, could you jet my carbs for me? and maybe a cleaning, PM with prices
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< ATGATT > Sweat you can wipe off, Road rash you can't. Burn Rubber, not your Soul. |
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October 2nd, 2015, 03:08 PM | #30 |
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pm sent
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December 12th, 2015, 05:51 PM | #31 |
gokartmozart
Name: randy
Location: land of corrupt govt-illinois
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CV carbs (stock 250R)
I will soon be tearing down my carbs for ultrasonic soak (been sitting for about 5 years) , Who would be the "go to" person for info and advice ? Also will need a good source for carb parts & gaskets.
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December 12th, 2015, 05:53 PM | #32 |
in your machine
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PM @ducatiman
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