August 17th, 2009, 09:55 PM | #1 |
ninjette.org newbie
Name: r
Location: vancouver
Join Date: Aug 2009 Motorcycle(s): ninja 250 Posts: 7
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power loss while accelerating hard
When I accelerate hard in first gear, my motorcycle loses power for a second. The engine will make less noise and I will slow down.
Does anyone know what could be the problem? I was reading the CDI thing but I only notice problems in first gear when I try to accelerate hard. If I accelerate slowly, everything seems fine. I'm worry it could my the clutch or the gear or something. But my bike is 09 and fairly new. I'm not sure that is problem. Any ideas would be appreciated. |
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August 17th, 2009, 10:26 PM | #2 |
ninjette.org member
Name: Nick
Location: SALT LAKE CITY, UT
Join Date: Jun 2009 Motorcycle(s): Red '08 250 Posts: 233
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Is your bike cold when this happens?
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August 17th, 2009, 10:32 PM | #3 |
Join Date: Nov 2008 Posts: Too much.
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how high is the tach reading when this happens?
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August 17th, 2009, 10:35 PM | #4 |
ninjette.org newbie
Name: r
Location: vancouver
Join Date: Aug 2009 Motorcycle(s): ninja 250 Posts: 7
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August 17th, 2009, 10:38 PM | #5 |
ninjette.org member
Name: Nick
Location: SALT LAKE CITY, UT
Join Date: Jun 2009 Motorcycle(s): Red '08 250 Posts: 233
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Ya give that a try, even on a warm day if i dont let my bike warm up for a bit that will happen to me
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August 17th, 2009, 10:51 PM | #6 |
ninjette.org member
Name: sean
Location: Sydney
Join Date: Dec 2008 Motorcycle(s): Ninja 250 09 Posts: 61
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Yup that happens to me when the bike is cold.
Not fun when trying to cross a intersection and the bike wont move fast to get through the gap. |
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August 17th, 2009, 10:53 PM | #7 |
ninjette.org member
Name: Nick
Location: SALT LAKE CITY, UT
Join Date: Jun 2009 Motorcycle(s): Red '08 250 Posts: 233
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August 18th, 2009, 10:25 PM | #8 |
ninjette.org newbie
Name: r
Location: vancouver
Join Date: Aug 2009 Motorcycle(s): ninja 250 Posts: 7
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thanks for the help.
i tried accelerating when my bike is warm. it is better. but it does seems like i have low power for the first little bit. I don't know if it is because the RPM is low or because it is the same problem. It still seems a bit slow in the first .2 seconds |
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August 18th, 2009, 10:35 PM | #9 |
Join Date: Nov 2008 Posts: Too much.
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so, the bike acts like it stutters or stalls for a few tenths of a second and then "catches" when in the lower rpms (idle to 4000rpm)?
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August 20th, 2009, 02:02 PM | #10 |
ninjette.org newbie
Name: r
Location: vancouver
Join Date: Aug 2009 Motorcycle(s): ninja 250 Posts: 7
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yes. it seems slower at first. but maybe it is in my head
I have an aftermarket exhaust. I don't think my bike has a jet kit. do you think that could be an issue? |
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August 20th, 2009, 02:04 PM | #11 |
Join Date: Nov 2008 Posts: Too much.
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lol... I'm still trying to get a clear picture of what the issue is.
mind starting over for a slow old guy? |
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August 20th, 2009, 02:18 PM | #12 |
ninjette.org sage
Name: Matthew
Location: Toronto
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aftermarket exhaust, has it been re-jetted? I only bring that up because if your bike was running lean, and was cold, I can certainly see this being an issue, (I'm no expert, but I thought I'd ask the question )
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August 20th, 2009, 02:23 PM | #13 |
ninjette.org newbie
Name: r
Location: vancouver
Join Date: Aug 2009 Motorcycle(s): ninja 250 Posts: 7
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no problem kkim.
I guess the only problem is that when i turn the throttle a lot in first gear, sometimes my engine gets very weak. So when i'm in first gear with no throttle and i crack it, instead of going faster, i kind of go slower. As Postiez said, it is probably because i didn't warm up my engine long enough. It kind sucks. I think i need to warm up my bike quite a bit before the problem is gone. |
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August 20th, 2009, 02:31 PM | #14 |
Join Date: Nov 2008 Posts: Too much.
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okay... gotcha.
these bikes do take a long while to warm up. I'd say on the order of 5-10 minutes. If not fully warmed, they can stall and sputter when trying to take off from a stop. The bikes come lean from the factory which leads to this cold blooded nature. Add to that the fact that the bikes are not always setup the same way when it comes to carb tuning (quality control) and you have some bikes worse that others when it comes to being lean from the factory. My advice is to shim the carb needles to richen up the mixture a bit. http://www.ninjette.org/forums/showthread.php?t=9465& You can also ride off with the choke partially engaged during the first 5-10 minutes to richen up the mixture... just don't forget to turn it off once your bike is fully warmed up on the road. |
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August 20th, 2009, 03:06 PM | #15 |
ninjette.org certified postwhore
Name: Sam
Location: Northern Virginia
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Many people think of a "choke" as a plate over the carb, which restricts the air intake; thereby causing a lower air/fuel ration....more gas in relation to the air.
On our bikes, the "choke" is just another jet, which allows gas into the carb. You might say it's like simulating "shimming" the needles. If it helps you to control the bike, prior to total warmup, why not do it (choke it). After the bike is warmed up and more responsive, turn the choke off. |
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August 20th, 2009, 04:01 PM | #16 |
ninjette.org sage
Name: Matthew
Location: Toronto
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Question, can you actually damage the bike if you left the choke on? (I don't... I'm just curious)
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August 20th, 2009, 05:36 PM | #17 |
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some believe you can... I'm not one of them.
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August 20th, 2009, 08:28 PM | #18 |
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Name: Sam
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August 23rd, 2009, 07:34 AM | #19 |
ninjette.org sage
Name: Greg
Location: central new york
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The choke is normally a plate that causes higher vacuum in the carb which pulls extra fuel into the mixture, so an extra jet that does the same thing would be a better idea.
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August 24th, 2009, 08:54 PM | #20 | |
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Name: Adzla
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Quote:
i won't spoil my bike with choking when cold... just leave her for 2-5 minutes while having a can of coke/stick of cigarette before making my journey. |
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August 24th, 2009, 09:26 PM | #21 |
ninjette.org certified postwhore
Name: Paul
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Hmmm, wonder if this is any way related to my bike feeling like it bogs when I grab a handful of throttle from a dead stop, no matter how warm or cold the bike. The first half second seems like the engine's not sure what's going on and rev's drop from idle a bit, then life on the 250 resumes as the engine tops ~4k (will have to try it a few times while really paying attention to confirm that number).
Of course, I'm not sure how the needles are shimmed atm, but I know they are the dynojet needles. Haven't messed with 'em since I bought the bike because, other than me trying to take off from a stop like a budding squid, bike seems happy. Will probably take a look at 'em soon.
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March 8th, 2010, 06:22 PM | #22 |
ninjette.org member
Name: Tim
Location: Ottawa
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This is the exact same issue that I am having as well. I am not trying to bring a thread back from the dead, but did anyone find a solution? I have shimmed needles 2 washers, no snorkle, clean carbs, drained tank, replaced gas
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March 8th, 2010, 10:20 PM | #23 |
ninjette.org member
Name: Kensai
Location: New Jersey
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Make sure your bike is warmed up before you try to go WOT from a dead stop. You can also try to rev the bike up more slowly at first and let the clutch out with the rpm's around 5-6k
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March 9th, 2010, 01:26 AM | #24 |
ninjette.org sage
Name: Chris
Location: Huntsville, AL
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One night when I took the bike out last summer, it was like I was hitting a dead zone in the rpm range. It was weird, it would pull hard until about 4k, then it would bog until 7k then take off again. It did that through out the whole ride, then never did it again.
I've had quite a few little quirks like that, such as my speedo not working properly one morning, an afternoon ride where the right turn signal was not working, ect. The issues always seem to resolve themselves though.
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May 17th, 2010, 07:29 PM | #25 |
ninjette.org member
Name: Alex
Location: Montreal
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bump on this thread
I'm having the exact problems, but it's happening every time I ride. It'll be more pronounced when I first ride off but it's less obvious as I ride along. This happens more notably in first and a little in 2nd... At around 4000 Rpm, the engine stops pulling even if I crank the throttle a little more. At this point, the tach goes up real slowly and at around 7000 rpm, it catches on again and gives me the usual power. So between 4 and 7000 rpm, i'm literally slowing down and cars are passing me... it's not good for starting from red lights.... After i get off the highway (engine fully warmed) I still feel that around these tach readings, there's a slight loss of power although less pronounced than the times i first leave my starting point. Maybe it's bc i put too much Seafoam in the batch of gas... someone in another post warned me abt this earlier today, but I don't know if that's the direct effect of putting too much Seafoam in a tank. I'll drain out the gas and put a fresh batch to see if that's the source of my problem. Somebody has insight on this? How did you fix your problem Redbike and Tim? Thanks everyone |
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May 17th, 2010, 07:50 PM | #26 |
ninjette.org member
Name: Kensai
Location: New Jersey
Join Date: Sep 2009 Motorcycle(s): Blue 2009 Ninja 250R Posts: 103
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I'm not quite sure its a loss of power in that RPM range more than a lack of power that the 250 makes. For me sometimes it seems like opening the throttle too wide in low RPMs makes it harder for the engine to rev up. I usually try to keep the engine running around 6000 RPM and rev to about 4000 while letting the clutch out to get moving from a stop.
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June 7th, 2010, 08:11 PM | #27 | |
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Quote:
Regarding too much Seafoam; if you just top off your tank it'll dilute the Seafoam and should fix the issue (if that's it) after a gallon or so, unless you put WAY too much in.
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June 8th, 2010, 08:21 AM | #28 |
ninjette.org member
Name: Alex
Location: Montreal
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problem solved... more or less
Hey Mo, sorry i haven't updated my reports yet.
I topped off the tank instead of draining it completely and the problems seems to have been solved (prolly too much Seafoam). However, I think i'll need to shim the needles since I get some hesitation when I cold start the bike and it wears off as the engine gets to riding temp. Lemme describe: when i start the bike after a long rest and start riding, it seems to want to choke when I get on the gas (esp when I give it more gas) AND it doesn't want to rev over 6-7K rpm, but this only happens after i start the bike. After 2-3 min, everything is back to normal. Needless to say, I do warm up the bike while i'm gearing up (abt 1 min or so). I'll shim the needles and remove snorkel and hope to resolve this hesitation after cold starts. Do you think this'll solve the hesitations or should i just let the bike warm up a lil longer? (I'll prolly shim anyways but just wanted to know the source of this prob) |
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June 8th, 2010, 10:53 AM | #29 |
Greenman!
Name: Jack
Location: South NJ
Join Date: Apr 2010 Motorcycle(s): 2009 Ninja 250 Posts: 109
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the same thing happened to my bike last night scared me when my headlights lost power. I thought it was because it was cold but 25 minutes into the ride it still did it
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June 8th, 2010, 11:25 AM | #30 |
ninjette.org certified postwhore
Name: Paul
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That sounds like a loose electrical connection to me, unless your bike was also acting strange. Even then, I'd suggest checking electricals.
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June 8th, 2010, 11:45 AM | #31 | ||
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Quote:
Quote:
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June 8th, 2010, 09:03 PM | #32 |
ninjette.org member
Name: Alex
Location: Montreal
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thanks for the tip! I'll prolly be doing that this week!
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June 28th, 2010, 05:00 PM | #33 |
ninjette.org member
Name: Scotty
Location: Brantford,ONT,Canada
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Riding with choke on will also foul plugs sooner, and possibly result in deposits in combustion chambers and on valves if done for long time.
Your issue could be fuel filter or kinked fuel line. Sounds like fuel delivery issue to me.
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