September 7th, 2018, 03:11 PM | #1 |
ninjette.org newbie
Name: Johnny
Location: Phoenix, AZ
Join Date: Sep 2018 Motorcycle(s): 2012 Kawasaki Ninja 250R Posts: 4
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Bike starts fine first time, won't idle or rev subsequent times.
Hello all,
I bought a 2012 Ninja 250R (first bike!) and have been working tirelessly to get the darn thing to run smoothly (to no avail). Here's what's happening. If I let the bike sit overnight (or at least a couple of hours) with the fuel switch set to PRI/prime, I can get it to start almost no problem. It takes a little bit of throttle for it to catch, but then it will rev as it should. However, as soon as I let off the throttle, the bike dies. Any further attempts to start still require the throttle, but the engine will no longer rev. It caps at somewhere <1,000RPM (I can't tell exactly, the tachometer doesn't work) even with the throttle maxed. This is still a slight improvement over the condition the bike was in when I bought it . So, here's what I've done in an effort to correct this problem.
Now, some notes about the bike in general (to provide context b/c it could be useful?).
I've now just about exhausted my knowledge of how to work on this bike and would love to avoid taking it into a shop. I spoke to a fellow rider at a Cycle Gear (great guy) who thinks it could be a blown head gasket, the way it dies on idle. Does anyone have any ideas what could be the root of the symptoms? I'm willing to do it myself, I just don't want to set out on a crusade until I'm at least 50% certain I need to . Thanks in advance for any replies. |
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September 7th, 2018, 04:13 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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Hi Johnny, welcome to the board. My money would be on the carbs still not being truly clean. Another possibility is restricted fuel flow, since after sitting it seems nearly OK for a little while.
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September 7th, 2018, 06:29 PM | #3 |
ninjette.org newbie
Name: Patrick
Location: SC
Join Date: Jul 2018 Motorcycle(s): 2010 250r 2016 ZX14r Posts: 5
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I would check to see if the slide diaphragm's are seated correctly or torn. 1.5 turns is super lean on these bikes I bet something else is causing your fouled plugs like float height or way too big main jets.
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September 7th, 2018, 08:59 PM | #4 | ||
ninjette.org newbie
Name: Johnny
Location: Phoenix, AZ
Join Date: Sep 2018 Motorcycle(s): 2012 Kawasaki Ninja 250R Posts: 4
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Thanks for the replies!
Quote:
I've also thought it could be restricted fuel flow, so that's my next direction I think. Quote:
Again, thank you both! |
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September 8th, 2018, 03:02 AM | #5 |
"a legend in my own mind"
Name: maverick9611
Location: Augusta,Georgia
Join Date: May 2017 Motorcycle(s): 2015 moto guzzi norge(brownie),2020 aprilia dorsoduro, Posts: A lot.
MOTM - Feb '18
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check petcock. u should never need prime to get it started. remove cover plate, check diaphragm, sometimes the spring over time or not running often will need a slight pull to lengthen spring a bit. my green bike that sat for 8 years needed max choke to stay running. i flushed fuel tank, clean carbs(not a deep cleaning) and it fired right up, everything normal. pilots jets had lots of crud in them. many on the board will say if ya don't have the proper equipment it's impossible to get carbs back to a factory new state. one of the members does run a carb rebuild/ cleaning service. he is very good at his trade. his handle is ducatiman. custom carb services
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"trying not to get old" |
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September 8th, 2018, 03:14 AM | #6 |
"a legend in my own mind"
Name: maverick9611
Location: Augusta,Georgia
Join Date: May 2017 Motorcycle(s): 2015 moto guzzi norge(brownie),2020 aprilia dorsoduro, Posts: A lot.
MOTM - Feb '18
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their is also a very small inline fuel filter that sits inside the inlet connection. sometimes it will hidden or up is your fuel line near connection. check and clean
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"trying not to get old" |
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September 8th, 2018, 07:09 AM | #7 | |
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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Quote:
Maybe "hardly ever" would be more correct than "never". |
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September 8th, 2018, 09:46 AM | #8 | |
ninjette.org newbie
Name: Johnny
Location: Phoenix, AZ
Join Date: Sep 2018 Motorcycle(s): 2012 Kawasaki Ninja 250R Posts: 4
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Quote:
EDIT: Found it in the carb diagram right after posting, haha. Part 49019, why have you forsaken me? EDIT 2: Found another issue. That particular filter is missing from my bike. Pretty soon I'll be rebuilding the petcock anyway, so I'll check the filter on that fella as well. Last futzed with by overtninja; September 8th, 2018 at 10:16 AM. Reason: Updated with more information. |
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September 8th, 2018, 12:24 PM | #9 |
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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Rebuilding petcock is good start. Sounds like vacuum diaphragm is not working properly to stay open and let fuel flow. Also check main jet, very common for people to go up in jet size rather than clean/floss the hidden fuel passasges in their carbs. Please review this thread and linked threads within on proper carb-cleaning procedure. https://www.ninjette.org/forums/showthread.php?t=323737
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September 14th, 2018, 07:56 PM | #10 |
ninjette.org newbie
Name: Johnny
Location: Phoenix, AZ
Join Date: Sep 2018 Motorcycle(s): 2012 Kawasaki Ninja 250R Posts: 4
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Hello everyone!
Just wanted to update this thread in case anyone else ever has a similar issue. Took the Ninja to a local mechanic and had them diagnose it. Although I was correct that my jets were stock, it turns out the previous owner had drilled out the pilot jet to be larger. This was causing the engine to flood, thus no idle. Thank you to all for your help! I now have a running bike! Cheers. |
1 out of 1 members found this post helpful. |
October 11th, 2018, 06:40 AM | #11 |
Ninja 250 and beta 300
Name: Matty
Location: Chocolatetown USA
Join Date: Oct 2018 Motorcycle(s): 2004 Kawasaki Ninja 250 Posts: 14
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the jet needle may need to be cleaned sounds like its rich tho from the black spark plugs you could try adjust the needle
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check out the youtube ninja 250 motovlogshttps://www.youtube.com/watch?v=CO4vg6W69cs&t=81s |
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October 11th, 2018, 07:16 AM | #12 |
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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October 11th, 2018, 10:36 AM | #13 |
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Name: -
Location: -
Join Date: May 2009 Motorcycle(s): - Posts: A lot.
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October 11th, 2018, 04:58 PM | #14 |
ninjette.org certified postwhore
Name: Kerry
Location: Ventura, CA
Join Date: Jan 2016 Motorcycle(s): Ninja650 Posts: A lot.
MOTM - Apr '18, Apr '17, Apr '16
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"More is always better" - guy here posted in a local forum about a guy who bought a new bike, KTM, I think, and came in three weeks later, livid because the bike was spewing white smoke. Guy had filled the oil to the tippy top because "the more oil they have, the better they run."
Got to wonder about some people. |
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