Expanding power band
Thread Starter
|
Junior Member
Joined: Sep 2009
Posts: 5
Likes: 0
Expanding power band
Hi
I have a new to me 1993 CBR 900. I am not new to bikes just new to sport bikes.
This bike has a very strong power band starting at 6,500 rpm. Below that it doesn't have much juice at all. My question is do these bikes normally have that prominent power band charicteristic ?? Can it be modified to expand the power band and get a little more power across the lower rpm range ??
I have never done it but I would like to try it out on a track day and it seems once in that power band the bike is to powerfull to controll and below it it's not powerfull enough.
As I said I am new to a sport bike and maybe this is all normall. Thanks For any Input. Tom
I have a new to me 1993 CBR 900. I am not new to bikes just new to sport bikes.
This bike has a very strong power band starting at 6,500 rpm. Below that it doesn't have much juice at all. My question is do these bikes normally have that prominent power band charicteristic ?? Can it be modified to expand the power band and get a little more power across the lower rpm range ??
I have never done it but I would like to try it out on a track day and it seems once in that power band the bike is to powerfull to controll and below it it's not powerfull enough.
As I said I am new to a sport bike and maybe this is all normall. Thanks For any Input. Tom
Senior Member
Joined: Apr 2008
Posts: 2,492
Likes: 0
From: Northern Michigan
what type of bike are you use to?
A 900RR should have power all over the place. Granted, its torque and hp are much higher in the rpm range than say a Harley, but by no means should it have no juice at all below 6500. It will pull much stronger once it s above 6500, but should still have plenty below that as well. But its hard to say, Im not sure what your definition of lacking is.... it could be different than mine as I've rode sportbikes for a long time and I am use to the power characteristics of them.
You may have a carb issue. I would get the carbs synced and possibly inspect and adjust the pilot jets. A carb cleaning may be in order. The condition your describing can be because of any of these things.
As far as expanding the power band. there really isnt anything you can do short of swapping transmission gears to widen the gears apart. You can swap sprockets, but that is either going to give you more power sooner, or let the power come on later. Putting the power on later will control your wheel from lifting as easy, but will make your low end worse... you can make your low end better, but will make the front end come up that much easier and that much harder to control. From the sounds of it, I don't think thats what your after.
If the bike is running correctly, the main thing you need to learn is throttle control. The 900RR is a wheelie happy bike. But make sure its running correctly before making changes.
A 900RR should have power all over the place. Granted, its torque and hp are much higher in the rpm range than say a Harley, but by no means should it have no juice at all below 6500. It will pull much stronger once it s above 6500, but should still have plenty below that as well. But its hard to say, Im not sure what your definition of lacking is.... it could be different than mine as I've rode sportbikes for a long time and I am use to the power characteristics of them.
You may have a carb issue. I would get the carbs synced and possibly inspect and adjust the pilot jets. A carb cleaning may be in order. The condition your describing can be because of any of these things.
As far as expanding the power band. there really isnt anything you can do short of swapping transmission gears to widen the gears apart. You can swap sprockets, but that is either going to give you more power sooner, or let the power come on later. Putting the power on later will control your wheel from lifting as easy, but will make your low end worse... you can make your low end better, but will make the front end come up that much easier and that much harder to control. From the sounds of it, I don't think thats what your after.
If the bike is running correctly, the main thing you need to learn is throttle control. The 900RR is a wheelie happy bike. But make sure its running correctly before making changes.
Thread Starter
|
Junior Member
Joined: Sep 2009
Posts: 5
Likes: 0
Thanks for the reply
Like I said maybe i'm just not used to it. I am sure my Gold Wing will keep up with it untill it hits 6,5oo rpm then there is no competition.
The carbs are good I just cleaned them, the bike sat before I got it. It runs fine. I'll put in some more saddle time before I start changing things.
Thanks Tom
Like I said maybe i'm just not used to it. I am sure my Gold Wing will keep up with it untill it hits 6,5oo rpm then there is no competition.
The carbs are good I just cleaned them, the bike sat before I got it. It runs fine. I'll put in some more saddle time before I start changing things.
Thanks Tom
Thread
Thread Starter
Forum
Replies
Last Post
