Acceleration Loss Mid-Flight - Honda Motorcycles - FireBlades.org
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post #1 of 36 Old 04-26-2009, 12:10 PM Thread Starter
 
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Acceleration Loss Mid-Flight

This morning while on my way to work on the freeway, i kinda lost hp to my bike, i think. I was doing about 85 at the time and was about to pass a car and click it into 5th when suddenly my bike slowed, engine got quiter, and throttle became less sensitive, and it kinda was jumpy. Usually i experience these symptons when im about to run outta gas and need to switch to reserve. But seeing as how i filled up before i got on the road this wasn't the case. I thought the bike was over heating but the temp gauge was dead center (and working). But it never shut off, i jus lost acceleration power. The engine got quite, my pipe gave a more deeper rumble, and the throttle was loose. I slowed down to about 65 and tried to accelerate back up and it took me a while to get to 75, and i had to almost twist the throttle all the way. this isn't normal for me cause my throttle is really sensitive; i barely have have to move my fingers normally to get going. Well i keep moving and about 5 miles down, the bike jumped back to "normal". Acceleration picked up, pipe voice was normal, throttle was senstive again... then .... about 30 secs later it slowed again, back to the low engine noise and deep pipe sound. When i arrived at my destination, i noticed the engine was kind of sputtering. I felt the gas coming from the pipe and it was choppy. No idea what the problem could have been, never seen this before.I've been having minor issues at start up with the choke and air-mixture, but never and in-flight issue. Worried and broke. Please advise
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post #2 of 36 Old 04-26-2009, 10:11 PM
 
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Re: Acceleration Loss Mid-Flight

sounds like maybe fuel pump going out or pressure regulator.....

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post #3 of 36 Old 04-26-2009, 11:14 PM
 
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Re: Acceleration Loss Mid-Flight

Have you modified the electrical system in any way? All stock ignition, plugs, coils, plug wires, etc? How many miles do you have on that stuff?
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post #4 of 36 Old 04-27-2009, 10:01 AM Thread Starter
 
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Re: Acceleration Loss Mid-Flight

everything is stock... no mods. its got about 24k on it. Funny thing is, when i started it up it was still acting funny. I got about 5 miles down the road then it jumps back to normal. Since then i've probably been about 10 more miles on it with no problems.
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post #5 of 36 Old 04-27-2009, 11:52 AM
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Re: Acceleration Loss Mid-Flight

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Originally Posted by Knewz View Post
I thought the bike was over heating but the temp gauge was dead center (and working). But it never shut off, i jus lost acceleration power. The engine got quite, my pipe gave a more deeper rumble, and the throttle was loose. I slowed down to about 65 and tried to accelerate back up and it took me a while to get to 75, and i had to almost twist the throttle all the way. this isn't normal for me cause my throttle is really sensitive; i barely have have to move my fingers normally to get going. Well i keep moving and about 5 miles down, the bike jumped back to "normal". Acceleration picked up, pipe voice was normal, throttle was senstive again... then .... about 30 secs later it slowed again, back to the low engine noise and deep pipe sound. When i arrived at my destination, i noticed the engine was kind of sputtering.
You say it felt like it was overheating - have you checked the coolant?
Check the fuel pressure regulator as well. Can you smell petrol in the crankcase?

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post #6 of 36 Old 04-28-2009, 1:09 PM Thread Starter
 
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Re: Acceleration Loss Mid-Flight

i did smell something. It wasn't a strong petrol smell but kinda faint sweet/burning oil mix scent.
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post #7 of 36 Old 04-28-2009, 1:18 PM
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Re: Acceleration Loss Mid-Flight

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i did smell something. It wasn't a strong petrol smell but kinda faint sweet/burning oil mix scent.
I can't smell so I can't clarify that for you but I believe burning coolant has a sweet smell.
Is the radiator full of coolant?

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post #8 of 36 Old 04-28-2009, 1:21 PM Thread Starter
 
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Re: Acceleration Loss Mid-Flight

full? doubt it. probably should look into fixing that.
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post #9 of 36 Old 04-28-2009, 2:57 PM
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Re: Acceleration Loss Mid-Flight

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full? doubt it. probably should look into fixing that.
Why do you doubt it? Surely if you have reason to doubt the radiator is full you'd top it up before riding it next?
If the level is lower than the temperature sender in the thermostat housing the gauge will read fine despite the engine overheating.
Let us know how much coolant is missing when you check it.

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post #10 of 36 Old 04-28-2009, 5:04 PM Thread Starter
 
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Re: Acceleration Loss Mid-Flight

so i checked the coolant reservoir ... and .....unless i'm blind, it is completely empty. Just to be sure i checked the right thing, it's on the right side of the bike and has a cap labeled "coolant" right? Which leads to a off-white reservoir behind/under the gas tank ( or in that general area)
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post #11 of 36 Old 04-28-2009, 11:37 PM
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Re: Acceleration Loss Mid-Flight

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Originally Posted by Knewz View Post
so i checked the coolant reservoir ... and .....unless i'm blind, it is completely empty. Just to be sure i checked the right thing, it's on the right side of the bike and has a cap labeled "coolant" right? Which leads to a off-white reservoir behind/under the gas tank ( or in that general area)
I'm not really concerned about the reservoir.
Is there coolant in the engine and radiator?

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post #12 of 36 Old 04-29-2009, 1:22 AM Thread Starter
 
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Re: Acceleration Loss Mid-Flight

didn't see any in there.
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post #13 of 36 Old 04-29-2009, 1:35 AM
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Re: Acceleration Loss Mid-Flight

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didn't see any in there.
Then I guess it overheated :-)
Maybe you should try filling the system up with coolant and see if it runs okay?
Since it appears to have sucked the reservoir dry as well it must've been very hot indeed.
Does it still run?

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post #14 of 36 Old 04-29-2009, 2:58 AM Thread Starter
 
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Re: Acceleration Loss Mid-Flight

yeah it runs. but if it idles for more than 2 minutes the temp. gauge goes straight H. If i can get on the highway, it naturally cools and will remain between C and H respectively. I looked into some coolants: prestone, supertech, and another brand i can't remember who makes SuperCool. prestone was silicate free, not sure about the others but all could be used in all Al engines. I'm guessing since there's no coolant in there now there's none to change, so i can just add.
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post #15 of 36 Old 04-29-2009, 3:01 AM
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Re: Acceleration Loss Mid-Flight

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yeah it runs. but if it idles for more than 2 minutes the temp. gauge goes straight H. If i can get on the highway, it naturally cools and will remain between C and H respectively. I looked into some coolants: prestone, supertech, and another brand i can't remember who makes SuperCool. prestone was silicate free, not sure about the others but all could be used in all Al engines. I'm guessing since there's no coolant in there now there's none to change, so i can just add.
When you fill it up keep an eye out for white smoke and watch the coolant level in the radiator. If you start losing coolant you may have done damage to the engine.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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