Engine become less powerful between 7k and 8k rpm
#1
Engine become less powerful between 7k and 8k rpm
Hi there,
since I have bought this bikes few months ago, I notice that the power delivered by the engine in the bike varies a lot depending on the revs.
I understand that at low revs, engine will deliver less power since that's usual on 4-strokes engines.
From 9k rpm on the engine will deliver the maximum power.
BUT, I notice that between 7k and 8k the engine flattens a bit. Like a power loss.
It is a bit annoying, because 7k-8k is a usual cruising range of revs when going on non-urban roads.
Someone came across the same issue?
Thanks!
Thanks
Angel
since I have bought this bikes few months ago, I notice that the power delivered by the engine in the bike varies a lot depending on the revs.
I understand that at low revs, engine will deliver less power since that's usual on 4-strokes engines.
From 9k rpm on the engine will deliver the maximum power.
BUT, I notice that between 7k and 8k the engine flattens a bit. Like a power loss.
It is a bit annoying, because 7k-8k is a usual cruising range of revs when going on non-urban roads.
Someone came across the same issue?
Thanks!
Thanks
Angel
Last edited by hebbo; 09-14-2011 at 08:16 AM.
#2
Is that a stock exhaust? The power band is all about fuel delivery and
moving the maximum air through the engine. Think of a giant pump.
The exhaust (in part) controls how the air flows out of the engine.
Usually, following a change in exhaust system, the fuel-injection will need to be tweaked.
Yours might not have been. The F4i guys will be more authoritative in their comments.
I'm still a carberated guy (F3).
But, ideally you should be pulling through in a smooth
curve of HP. My bike starts to pull hard at 5-6k and by 7-8k and beyond, you better be definetly settled to the bike. My flat point is in the 4-5k+ -ish part of the band.
Being sane and on the street (not to mention gas milage), I seldom peek over the 12-14k band.
I'm not sure how you change the programing on a fuel-injected bike, but there is a way.
Other-wise, possibly run some Seafoam (or similar additive) to the fuel for a
couple of tanks, see if that clears out anything.
Ern
moving the maximum air through the engine. Think of a giant pump.
The exhaust (in part) controls how the air flows out of the engine.
Usually, following a change in exhaust system, the fuel-injection will need to be tweaked.
Yours might not have been. The F4i guys will be more authoritative in their comments.
I'm still a carberated guy (F3).
But, ideally you should be pulling through in a smooth
curve of HP. My bike starts to pull hard at 5-6k and by 7-8k and beyond, you better be definetly settled to the bike. My flat point is in the 4-5k+ -ish part of the band.
Being sane and on the street (not to mention gas milage), I seldom peek over the 12-14k band.
I'm not sure how you change the programing on a fuel-injected bike, but there is a way.
Other-wise, possibly run some Seafoam (or similar additive) to the fuel for a
couple of tanks, see if that clears out anything.
Ern
#3
#4
Thanks for your replies.
I know absolutely nothing about what has been done in te bike since I am the 6th owner! XD
The exhaust is the factory one, but looks like it was fit just before I got the bike from a dealer. I can notice this power loss since I got the bike, but really did not pay it too much attention. Now I am suffering it a bit more since I am more confident with the bike. (My first big bike)
At least, I wanted to know whether this is normal in these big 4-stroke bikes, or this model. My guesses were:
- Faulty spark plug not working properly at this range of revs
- Faulty injectors not working properly at this range of revs
- Faulty fuel pump?
- I would dismiss faulty exhaust although yeah, maybe the electronic commander is misconfigured.
Any thoughts?
Cheers
I know absolutely nothing about what has been done in te bike since I am the 6th owner! XD
The exhaust is the factory one, but looks like it was fit just before I got the bike from a dealer. I can notice this power loss since I got the bike, but really did not pay it too much attention. Now I am suffering it a bit more since I am more confident with the bike. (My first big bike)
At least, I wanted to know whether this is normal in these big 4-stroke bikes, or this model. My guesses were:
- Faulty spark plug not working properly at this range of revs
- Faulty injectors not working properly at this range of revs
- Faulty fuel pump?
- I would dismiss faulty exhaust although yeah, maybe the electronic commander is misconfigured.
Any thoughts?
Cheers
#5
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lanceam24
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02-21-2011 11:45 AM