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Old 08-04-2010, 05:25 PM   #1 (permalink)
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Question Losing power (bogging) on Freeway High RPM. Scary, Help Please!

Hello all,

this is my very first motorcycle and yes I am a newb so I apologize for any ignorance in advance.

i tried searching many a times for an answer here but to no avail.

Here's the deal. My bike runs great while riding around town in streets. When i get on the freeway and go ~80 mph and above my bike will run a couple of miles great. But after a while it will suddenly lose power (bog down) and start dropping speed down to 65. I will give it full throttle but the bike will keep dropping speed or just hold the speed at ~65mph. If I happen to release the throttle the speed will drop and if given more throttle it will stay at that lower speed and not go faster till I pull over.

I have to get off and the engine will sometimes die when coming to a stop. I wait a few seconds and restart it with the choke and it goes fine and will ride the streets no problem.

What is wrong with my bike????? Is it the engine, fuel system, is it overheating??? Is it a fixable problem??? Am I not letting it warm up long enough???

Is this normal since its a 250cc and isnít built to ride at 80 mph to 90 mph for a long period of time (Iím guessing)???

HEEEELP!

I have not experienced this problem while going 65-70 mph for long rides on the freeway. Only when I ride higher speeds for an extended period of time ~5-10 miles.

bike specs
2008 ninja 250r stock
bought it used with 1800 miles on it

Other examples to be more specific. All separate days.

1st time Happened (Orange county, ca. 6:45 am)
started my bike, let it warm up, road onto freeway. started going average 85 - 90 mph. about 8-10 miles down the freeway, it suddenly started losing power and dropping speed. I gave it w.o.t. and still slowed down and engine wouldn't speed up. it stopped dropping to 65mph then it maintained there unless I slowed it down then it would stay at that lower speed 50 mph. Scary when 18 wheelers are passing you lol!

exited and turned off the engine, let it cool down for 1 minutes, started fine and ran fine street wise. so got back on and SAME THING HAPPENED AGAIN going 85 mph only at a shorter distance ~4 miles. It wouldnít start unless I put the choke, then rode fine in streets again.

2nd time. (Orange county, ca. 6:45 am)

Same thing happened only I was going average 75-80 mph. It lasted a little longer, but same situation happened only the engine did turn off when coming to stop.

3rd time (Orange county, ca. 5:50 P.M.)
Same as 2nd time, engine died coming to a stop.

4rth time (Orange county, ca. 2:00 AM)
Same thing, only going average 75 mph bout 8 miles down freeway. Engine did die when I was coming to a stop.

I just wait a minute or little less, put the choke on, then it starts and run like a beauty in streets.

Any help would be appreciated, if need any more specifics please ask.

Thank you!
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Old 08-04-2010, 07:07 PM   #2 (permalink)
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You say you bought it used. Give us the history. Mods? Condition?

Do some basic maintenance on it: Drain out the bowl, clean out carb, check that the vacuum diaphragm is not pinched/ripped, spark plugs are not fouled, etc.
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Old 08-05-2010, 09:46 AM   #3 (permalink)
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You may have a clogged breather in the gas tank gas cap. What happens is it lets air in as the gas goes out, if it is clogged then you develop a vacuum that can be strong enough to prevent gas from getting into the carbs, or slow down the rate at which it gets into the carbs. Which would either kill the bike or limit its speed depending on how fast it was getting in there. The best test for this is to actually ride the bike until it dies/bogs like you were saying and when it happens pull over, rip off your helmet and pop the gas cap. If you hear a "whoosh" noise like air being sucked into the tank then you'll have to clean out the breather.

Other possibilities include the wrong size mainjet or an improperly installed one. Or a vacuum leak at the carbs.
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Old 08-05-2010, 08:32 PM   #4 (permalink)
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I was actually going to suggest the whole gas cap thing, when I had my old bike I stalled for no reason and I couldn't figure out why and after sitting on the side of the road trying to get the stupid thing to start and calling the dealership, I popped the gas cap to make sure there was enough gas in the tank and voila! The bike worked just fine! I felt really stupid but was really grateful that it was as simple as that.
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Old 08-05-2010, 08:39 PM   #5 (permalink)
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Originally Posted by arcin226 View Post
I was actually going to suggest the whole gas cap thing, when I had my old bike I stalled for no reason and I couldn't figure out why and after sitting on the side of the road trying to get the stupid thing to start and calling the dealership, I popped the gas cap to make sure there was enough gas in the tank and voila! The bike worked just fine! I felt really stupid but was really grateful that it was as simple as that.
What year bike was this on?

That's never happened to me: Old gen and not.

But if that's the case wouldn't that suggest one of the evap lines are plugged, when they shouldn't be?
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Old 08-05-2010, 08:50 PM   #6 (permalink)
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Quote:
Originally Posted by bmiramontes05 View Post
Is this normal since its a 250cc and isnít built to ride at 80 mph to 90 mph for a long period of time (Iím guessing)???

HEEEELP!

I have not experienced this problem while going 65-70 mph for long rides on the freeway. Only when I ride higher speeds for an extended period of time ~5-10 miles.


Thank you!

Mine runs great and strong at 80-90 MPH+ @ 11,000-12,000RPMs for 3 hours on the highway during my trips up to my cousins house on the weekends! :P

250cc is built for highways.



Aside from the vaccum possible issue, does your bike poof smoke behind you while riding it?

could also be the valves need adjusting. how many miles on your bike ATM?
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Old 08-06-2010, 09:32 PM   #7 (permalink)
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@Devilrey

The bike is stock for what i know, it was dumped once but not to bad.

@ Sev

I will test it out the gas thing tank this weekend.

  • I have never worked on a bike (my first bike) so it should interesting to take it apart and work on it .
  • Are these tasks hard to do (wrong size main jet or an improperly installed one. Or a vacuum leak at the carbs, valve adjustment)???
  • Any suggested links with steps for these procedures?

@ ScorpianNinja

It has 2543 miles and i only put 671 since buying her from a motorcycle shop. 1873 miles when purchased

  • No Smoke comes out of the tail pipe at all

Thank you for the advice people, i will follow up with you when i test the gas tank tomorrow! Pray for the best for me please!

Much appreciated and God Bless
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Old 08-06-2010, 10:36 PM   #8 (permalink)
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Quote:
Originally Posted by Devilrey View Post
What year bike was this on?

That's never happened to me: Old gen and not.

But if that's the case wouldn't that suggest one of the evap lines are plugged, when they shouldn't be?
Yes, that's exactly what I suggested.

Quote:
Originally Posted by bmiramontes05 View Post
@ Sev

I will test it out the gas thing tank this weekend.

  • I have never worked on a bike (my first bike) so it should interesting to take it apart and work on it .
  • Are these tasks hard to do (wrong size main jet or an improperly installed one. Or a vacuum leak at the carbs, valve adjustment)???
  • Any suggested links with steps for these procedures?
The gas cap bit is easy. The rest... well it's complicated but not difficult, there are write ups all over the place. Just be methodical and you'll be fine.

I won't be valves, valves don't cause that problem.
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Last edited by Sev; 08-06-2010 at 10:38 PM.
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Old 07-27-2011, 05:35 AM   #9 (permalink)
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Sooooooo did anyone figure this out.... cause im still having this problem!!!! I heard it might be gas cap but I can smell gas so its rather leaking out instead of sealing it all in right?
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Old 07-27-2011, 06:33 AM   #10 (permalink)
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Quote:
Originally Posted by Sev View Post
You may have a clogged breather in the gas tank gas cap. What happens is it lets air in as the gas goes out, if it is clogged then you develop a vacuum that can be strong enough to prevent gas from getting into the carbs, or slow down the rate at which it gets into the carbs. Which would either kill the bike or limit its speed depending on how fast it was getting in there. The best test for this is to actually ride the bike until it dies/bogs like you were saying and when it happens pull over, rip off your helmet and pop the gas cap. If you hear a "whoosh" noise like air being sucked into the tank then you'll have to clean out the breather.

Other possibilities include the wrong size mainjet or an improperly installed one. Or a vacuum leak at the carbs.
This is very interesting , and altough I recon that it probably won't be safe , could you just keep an extra key on the gas tank and pop the gas tank cap open when just when it happens to see if it corrects?
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