July 8th, 2014, 03:26 PM | #1 |
ninjette.org member
Name: Quang Lu
Location: Atlanta
Join Date: Jun 2014 Motorcycle(s): None Yet Posts: 13
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Motor struggles when I give it throttle
My first bike ever so I don't know much about maintenance on a motorcycle, but I have worked on cars so mechanically. It's nothing new to me. Anyways, I got my 2008 ninja with 9,100 miles on it. The previous owner said he didn't do anything to the bike as far as maintenance or mods.
When I took it home. I changed out the oil and oil filter, cleaned out the air filter and coated it with motor oil. I poured Carburator cleaner into the tank. I'm assuming the guy never did a valve adjustment so I'm getting around to doing that this week. Anyways, the bike starts up without any choke and idles at 1,300-1,500 rpms and once it's warmed up I give it full throttle and it struggles as if I'm flooding the motor. Is there any reason to why it's doing that, that is maintenance related? Oh and side note, when I went to drain the old oil, there was metal shavings in the oil, not a lot, but there was some metal shavings. I know in cars thats a really bad sign, but is this normal? |
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July 8th, 2014, 03:28 PM | #2 |
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.
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You roll onto full throttle smoothly, or snap it to full throttle instantly? If the latter, you can get a small carbed engine to bog a bit.
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July 8th, 2014, 03:48 PM | #3 | ||||
Long Time Rider
Name: Blue
Location: Charlotte, NC
Join Date: Sep 2010 Motorcycle(s): 2009 Kawasaki Ninja 250R Posts: A lot.
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Quote:
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How much cleaner and what kind? Quote:
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And no it's not normal. You may what to inspect further into the metal shavings in your oil. Metal shavings usually means either you crank or something else is gone to shat. Does the motor make any loud clacking sounds? If so, check your oil screen, so you can rule out a crank bearing. For more info on this issue, see this thread. https://www.ninjette.org/forums/show...ght=oil+screen |
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July 8th, 2014, 03:48 PM | #4 |
ninjette.org member
Name: Quang Lu
Location: Atlanta
Join Date: Jun 2014 Motorcycle(s): None Yet Posts: 13
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I snap it instantly, and it builds it's rpms pretty slowly. Is that normal for these kinds of motors?
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July 8th, 2014, 03:55 PM | #5 | |
ninjette.org member
Name: Quang Lu
Location: Atlanta
Join Date: Jun 2014 Motorcycle(s): None Yet Posts: 13
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Quote:
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July 8th, 2014, 03:58 PM | #6 |
Long Time Rider
Name: Blue
Location: Charlotte, NC
Join Date: Sep 2010 Motorcycle(s): 2009 Kawasaki Ninja 250R Posts: A lot.
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There is a natural lag, because the carbs are vacuum operated, (but it's like millisecond or two) other than that, the engine will respond nicely when you twist the throttle (not snap it), provided it's well tuned and nothing is wrong
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July 8th, 2014, 04:00 PM | #7 |
ninjette.org member
Name: Quang Lu
Location: Atlanta
Join Date: Jun 2014 Motorcycle(s): None Yet Posts: 13
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okay, I'll record a video of the bike with the motor running. The motor sounds fine to me. No knocking, slaps or anything out of the ordinary.
Last futzed with by Alex; July 8th, 2014 at 04:24 PM. Reason: fixed video link: only put the video ID itself between the tags, not the whole URL |
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July 8th, 2014, 04:41 PM | #8 | |
CPT Falcon
Name: J.Emmett Turner
Location: Newnan, GA
Join Date: Apr 2009 Motorcycle(s): '08 CP Blue EX250J, '97 unpainted EX250F, 2nd '97 unpainted EX250F (no engine), '07 black EX250F Posts: A lot.
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July 9th, 2014, 04:49 AM | #9 | |
Long Time Rider
Name: Blue
Location: Charlotte, NC
Join Date: Sep 2010 Motorcycle(s): 2009 Kawasaki Ninja 250R Posts: A lot.
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Quote:
Double check that you don't have too much oil on the air filter. Too much oil can cause breathing problems. As a matter of fact you may want to replace the air filter if it has not been replaced. Kawasaki recommends replacement @ 2 years. You're also due for spark plug replacement. Some good carb info; How Constant Velocity Carburetors Work(see pages 14-20) |
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