May 22nd, 2019, 08:27 AM | #1 |
ninjette.org newbie
Name: Juan
Location: Alexandria
Join Date: May 2017 Motorcycle(s): 2013 Ninja 300, 2009 GSXR 1000, 2005 American Ironhorse Legend, 1999 Honda Shadow A.C.E. Posts: 9
|
Ninja 300 dropping power at high RPM
Hey all,
Tuner has my bike and as he's doing runs, it drops 2 hp anywhere between 11K and 13K rpm. Very strange. It is sporadic, as to when it happens, 11K, 11.5K, 12K rpm, etc... But it drops the exact same every time. The A/F curve is constant, smooth and a thing of beauty. 2013 Ninja 300 Race bike. Supersport build. Pulled the Bazazz, no change, did it with clutch switch in and out, no change, disconnected quick shifter, no change. The whole thing is very bizarre. Anybody else seen this before? Gonna change the ECU today to see if it is a signal issue, but I can't think of anything else that would cause it. Any input would be appreciated. |
|
May 22nd, 2019, 11:49 AM | #2 | |
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
|
Quote:
Plugs, wires, coils, anything else ignition related. |
|
|
May 22nd, 2019, 01:25 PM | #3 |
ninjette.org newbie
Name: Juan
Location: Alexandria
Join Date: May 2017 Motorcycle(s): 2013 Ninja 300, 2009 GSXR 1000, 2005 American Ironhorse Legend, 1999 Honda Shadow A.C.E. Posts: 9
|
That's what we thought. Plugs are relatively new (one race weekend). The coils are good and wires from harness and Bazazz are good. Cams have been degreed and timing is good. Only happens in a very small rpm range.
|
|
May 22nd, 2019, 02:17 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.
MOTM - Jun '18, Oct '16
|
Can you isolate the problem to one cylinder?
It would be unusual for a plug to be bad, but it maybe worth changing plugs just to cross it off the list. |
|
May 22nd, 2019, 03:06 PM | #5 |
ninjette.org newbie
Name: Juan
Location: Alexandria
Join Date: May 2017 Motorcycle(s): 2013 Ninja 300, 2009 GSXR 1000, 2005 American Ironhorse Legend, 1999 Honda Shadow A.C.E. Posts: 9
|
That's fair, and I will check them, but if it were a plug issue, you would expect it across the entire RPM range. It is only dropping out momentarily and only in high rpm's.
|
|
May 22nd, 2019, 03:11 PM | #6 |
ninjette.org newbie
Name: Juan
Location: Alexandria
Join Date: May 2017 Motorcycle(s): 2013 Ninja 300, 2009 GSXR 1000, 2005 American Ironhorse Legend, 1999 Honda Shadow A.C.E. Posts: 9
|
Diagnostics didn't indicate any misfiring and voltage appears to be good. Battery is at 14.7v when running (li-ion).
My best guess is that there is a connection somewhere that is losing continuity when the harmonic frequency at that RPM range causes just the right vibration. I'll get the bike tomorrow afternoon, pull all the harness connections, make sure they are clean and have solid contact. Hopefully that solves it. |
|
May 22nd, 2019, 06:07 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
|
Post your dyno-chart with AFR.
Is chart same with and without Bazazz in place? When was last time valve-adjustment done? Air filter replaced/cleaned recently? Also verify secondary butterflies are working properly. |
|
May 22nd, 2019, 08:38 PM | #8 |
ninjette.org newbie
Name: Juan
Location: Alexandria
Join Date: May 2017 Motorcycle(s): 2013 Ninja 300, 2009 GSXR 1000, 2005 American Ironhorse Legend, 1999 Honda Shadow A.C.E. Posts: 9
|
New filter, no secondary butterflies, no recent valve adjustment, but we don't believe it is fuel or air since A/F ratio doesn't change. Drop occurs with or without Bazazz
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Ninja 250 power loss at high RPM | Blueninja2007 | 1986 - 2007 Ninja 250R Tech Talk | 10 | March 7th, 2018 05:24 AM |
'02 Ninja 250 - Little to no power in lower RPM range | MrMistyEyes | 1986 - 2007 Ninja 250R Tech Talk | 9 | December 16th, 2015 10:55 PM |
Just cleaned carbs - now stuttering at low RPM, fine at high RPM | Ohio | 2008 - 2012 Ninja 250R Tech Talk | 20 | August 5th, 2014 10:30 PM |
High handle bar vibration, hard to get into high RPM, is this normal? | jackliu239 | 1986 - 2007 Ninja 250R Tech Talk | 24 | September 19th, 2013 09:04 PM |
Power loss at high rpm | ///NR | 2008 - 2012 Ninja 250R Tech Talk | 4 | June 29th, 2010 09:34 PM |
|
|