Rs 125 doesn't get into the redline...

[5v3d3b0]

I know I sound like on of those tittie revving chavs, but seriously now. Is it normal that it gets to the redline and doesn't get into the last 3000 revs?

[Kickstart]

Hi

Should get to the red no problem if it is a full power bike. Restricted it will go to sleep around 8000rpm.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[TUG]

same problem with my FZR i think its the restriction on the CDI it wont redline all the way when in neutral, but when on the move SOMETIMES it goes right to the end. but my bike is 19 yrs old. alot of factors can stop it revving all the way like worn carbs or incorectly set up carbs. worn engine?
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Haz ER-5, innit!

[5v3d3b0]

It is full power, and the egnine has about 7-8000 miles...I guess it IS time for a service...gonna cost a fair bit though... If i'm right I have to change piston now right?

[Kickstart]

Hi

Suspect the power valve has stuck then. Fairly common if they are used at low speed for too long. Marginally quicker like this than a properly restricted bike, but still goes to sleep a bit past 8000rpm.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[5v3d3b0]

Which would explain why I only got it up to 100mph exact indicated. I've seen people taking it to 180kmh. that's 20 more than me

[Kickstart]

Hi

Depends on how big you are, gearing, exact model, etc but they should indicate more than 160. I have had mine round to 185kmh on the flat, but I am fairly skinny and it is an early one running the larger carb as standard. And the speedo is a compulsive liar.

If the power valve was sticking then I would expect it to struggle to go past 140~150 kmh indicated.

On mine an incated 100mph / 160kmh would be about 10000rpm indicate. Only 750rpm off the red line. Far beyond the 3000rpm you say you cannot use.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[5v3d3b0]

I think I might have found the problem. When I did my top speed run my chain was knackered...Anything to do with it?
I now have brand new sprockets and chain with standard gearing

[prawny1]

People claiming 120mph from a 125 are just playing with their own plums, Just my opinion.

Much like the latest generation of cbr125 owners saying they can get 95-100mph from a 4 stroke but then refusing to say whether or not they were bouncing of the rev limiter down a hill.
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hellkat wrote:

Some people are only alive cos its against the law to kill them.

[Kickstart]

[5v3d3b0]

You got me wrong. It gets TO the redline, but doesn't go into the red revs (up to 14k revs) I was wondering if you can normally go all the way. I got it up to 10-11k

[Kickstart]

Hi

Red line is the point where it is safe to go on a regular basis. Going into the red is taking a risk of engine damage, and normally with no great benefit. Not sure on your but from memory of the older ones when they published a claimed peak power then that was at bang on the red line at 10750, and from the road tests power dropped off rapidly after that. Basically next to nothing to be gained by revving it into the red except the higher chance of blowing the engine up.

Doesn't matter where the red line ends. Where it starts is the important bit. Put it this way if they colourd the entire dial red from the start of the red line all the way back round to zero would you want to rev it hard enough for the needle to do a complete circle and get to the end of the red (say, 20000rpm)?

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Ben.]

[Kickstart]