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October 21st, 2014, 01:16 PM
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#1 |
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ninjette.org member
Name: julio
Location: houston
Join Date: Jul 2013 Motorcycle(s): 2012 ninja 250r Posts: 49
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popping noise
My bike makes a single pop when it starts cranking usually after its been sitting a while. I'm curious is that because of valves or what
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October 21st, 2014, 01:18 PM
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#2 |
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The Corner Whisperer
Name: Chris (aka Reactor)
Location: Northern KY
Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much.
MOTY 2015, MOTM - Nov '12, Nov '13
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A backfire?
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Goal: Shake A Million Hands | Look through the corners | Track Day Prep | Closest track? | The Mid-Ohio School |
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October 21st, 2014, 01:42 PM
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#3 |
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ninjette.org member
Name: julio
Location: houston
Join Date: Jul 2013 Motorcycle(s): 2012 ninja 250r Posts: 49
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I guess
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October 21st, 2014, 01:55 PM
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#4 |
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ninjette.org sage
Name: Brian
Location: Orange County, CA
Join Date: Apr 2012 Motorcycle(s): '12 ninja 250r Posts: 762
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It couldn't hurt to do a valve adjustment, when was the last time? Carb cleaning? Are there any mods on your bike?
My bike backfires too from time to time. Totally random, at different states of modifications, different temps, different waiting periods. |
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October 21st, 2014, 02:02 PM
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#5 |
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ninjette.org member
Name: julio
Location: houston
Join Date: Jul 2013 Motorcycle(s): 2012 ninja 250r Posts: 49
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Bike is stock except for k&n filter and I haven't cleaned the carbs and I'm at 14k so I'm going to get it checked out
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October 21st, 2014, 02:04 PM
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#6 |
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ninjette.org sage
Name: Brian
Location: Orange County, CA
Join Date: Apr 2012 Motorcycle(s): '12 ninja 250r Posts: 762
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No valve inspection/adjustment at that mileage? Definitely get that checked out.
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October 21st, 2014, 02:12 PM
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#7 |
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The Corner Whisperer
Name: Chris (aka Reactor)
Location: Northern KY
Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much.
MOTY 2015, MOTM - Nov '12, Nov '13
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Try a simple fix first;
Do you use the choke when cold starting? No? Try it next time. You might want to consider shimming your needles.
__________________________________________________
Goal: Shake A Million Hands | Look through the corners | Track Day Prep | Closest track? | The Mid-Ohio School |
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October 21st, 2014, 02:16 PM
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#8 |
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ninjette.org member
Name: julio
Location: houston
Join Date: Jul 2013 Motorcycle(s): 2012 ninja 250r Posts: 49
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I had the valves inspected at 7.5k and. I do use the choke on cold starts
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October 21st, 2014, 02:35 PM
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#9 |
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Inline 4!!!
Name: Danny
Location: MA
Join Date: May 2014 Motorcycle(s): 2008 CBR600rr, 1987 KLR 250 Posts: A lot.
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My slipon "pops" when I decel, I love it ^_^
__________________________________________________
Be careful. Remember you are invisible |
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October 21st, 2014, 03:27 PM
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#10 |
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The Corner Whisperer
Name: Chris (aka Reactor)
Location: Northern KY
Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much.
MOTY 2015, MOTM - Nov '12, Nov '13
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Ok cool, let's at least start by which area this pop comes from. Exhaust or carb? Does it pop from the tailpipe or does the sound come from under the seat/somewhere in the middle of the bike?
__________________________________________________
Goal: Shake A Million Hands | Look through the corners | Track Day Prep | Closest track? | The Mid-Ohio School |
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October 21st, 2014, 03:53 PM
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#11 |
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ninjette.org member
Name: julio
Location: houston
Join Date: Jul 2013 Motorcycle(s): 2012 ninja 250r Posts: 49
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Sounds like the tailpipe
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October 23rd, 2014, 09:46 AM
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#12 |
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Hello Moto
Name: Alex
Location: Ft. Myers
Join Date: Mar 2013 Motorcycle(s): 1975 RD350; 2001 KX125; 2003 Z1000; 2003 KDX50; 2009 ZX6R; 2011 Ninja 250R; 2014 KX250F Posts: 352
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Popping from the exhaust is unburned gas igniting in the pipe. Might sound cool- but it's indicative of a bad air fuel mix.
If it only happens at start up after sitting for a while my guess is that the carb bowls are filling up too much and fuel vapor is getting in to the cylinder and messes with the ratio only at start up. Clean or replace the needle valves in the carbs if the float level is within spec. |
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October 23rd, 2014, 10:14 AM
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#13 |
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Participant
Name: Dave
Location: South of Seattle
Join Date: Oct 2012 Motorcycle(s): '94 K75 std Posts: Too much.
MOTM - Aug '15
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If it only happens once in a while (after sitting for weeks) at start-up and it's not an ear-shattering "kaboom", why even worry about it?
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October 25th, 2014, 03:30 PM
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#14 |
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ninjette.org dude
Name: 1 guess :-)
Location: SF Bay Area
Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much.
Blog Entries: 7
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