June 12th, 2017, 04:05 PM | #1 |
james250ninjette.newbie
Name: james
Location: cherry hill, nj
Join Date: Mar 2010 Motorcycle(s): 1986 ninja 250 Posts: 276
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Larger pilot jet
I have a stock 08 ninja 250s
Was wondering what would happen if i went size larger on the pilot jets only..rather than go larger on main jet. Everything stock on my bike |
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June 12th, 2017, 04:18 PM | #2 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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What's your goal? Pilot jets are active only down around idle, and your mixture screws should have enough range to get your idle mixture correct without changing the jets.
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1 out of 1 members found this post helpful. |
June 12th, 2017, 04:22 PM | #3 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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The factory main jet is actually too rich. With my Tyga exhaust, the DynoJet kit actually has a smaller-than-stock main jet for a 2-3hp gain. Remember that '60s hot-rodder slogan?
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June 12th, 2017, 05:38 PM | #4 | |
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:
Comparing actual specs (internal measurements) would give you a comparison, but that's the only way to know how much richer or leaner it is. That's why I prefer Factory Pro jet kits over Dynojet. |
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June 12th, 2017, 05:42 PM | #5 | |
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.
MOTM - Jun '18, Oct '16
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Quote:
https://faq.ninja250.org/wiki/How_a_...arbs_explained |
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June 13th, 2017, 12:52 PM | #6 |
ninjette.org sage
Name: Kevin
Location: Portland, OR
Join Date: Oct 2013 Motorcycle(s): Ninja 250R, Tiger 800 XRT Posts: 828
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I have a Keihin 95 main jet in mine with an AreaP full exhaust. Stock is 98, so stock is too rich on some specimens at least.
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June 13th, 2017, 03:40 PM | #7 | |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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Quote:
Only way to know actual AFR and when to go richer or leaner is with dyno or wideband-O2. So far from our empirical data, going to leaner mixture at WOT gives more power with factory and aftermarket exhaust. |
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June 15th, 2017, 02:56 PM | #8 | |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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Quote:
https://www.ninjette.org/forums/showthread.php?t=50337 https://www.ninjette.org/forums/showthread.php?t=55927 |
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June 15th, 2017, 03:15 PM | #9 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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I would perform a correctly done plug chop before going to leaner main jets.
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