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Does not run well at 5500-6000rpm

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Does not run well at 5500-6000rpm
« on: June 09, 2013, 10:42:05 AM »
 

berra

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Hi everyone im just woundering if anyone else is having problem losing power at 5500-6000rpm it runs good at all other rpms but seems to be missing some power just there.Have anyone had the same problem and what did you do to fix it ive had the bike for 6 years and its always been like that hope for some good advise from all you pros out there/berra
 

Re: Does not run well at 5500-6000rpm
« Reply #1 on: June 09, 2013, 18:45:33 PM »
 

robvangulik

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Hi Berra,
That sounds like the little holes in your emulsion tube are clogged, that is the little brass pipe that holds the main jet in the carburator.
I wouldn't be surprised at all if your carbs could do with a little cleaning on the inside anyway, at this age.
If I remember well you're in Sweden, and I suppose your bike doesn't come on the road for several months every winter, and modern fuel doesn't keep as well as it used to do.
Did you find a cdi, you were looking for one, weren't you?
 

Re: Does not run well at 5500-6000rpm
« Reply #2 on: June 10, 2013, 00:09:58 AM »
 

Connor

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Hi Berra,
That sounds like the little holes in your emulsion tube are clogged, that is the little brass pipe that holds the main jet in the carburator.
I wouldn't be surprised at all if your carbs could do with a little cleaning on the inside anyway, at this age.
If I remember well you're in Sweden, and I suppose your bike doesn't come on the road for several months every winter, and modern fuel doesn't keep as well as it used to do.
Did you find a cdi, you were looking for one, weren't you?

Wow Rob, they should slice up your brain as a pin up example of how memory works! smile1004up
 

Re: Does not run well at 5500-6000rpm
« Reply #3 on: June 10, 2013, 00:36:54 AM »
 

robvangulik

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I'd rather they didn't, it doesn't work anymore afterwards smile1004gross
 

Re: Does not run well at 5500-6000rpm
« Reply #4 on: June 10, 2013, 19:17:16 PM »
 

berra

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Wow u really have a Great memory and yes i got hold of a cdi it work exept for the rpm problem but i Will try to follow your surgestion and rinse the carbs even if i know the workshop Did it few years ago and it still runned crappy but workshops can fail as well thx for the tip
 

Re: Does not run well at 5500-6000rpm
« Reply #5 on: June 11, 2013, 01:07:29 AM »
 

robvangulik

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Let us know the results, and try to take some pictures, 1 pic says more than a 1000 words :thumbs:
 

Re: Does not run well at 5500-6000rpm
« Reply #6 on: May 02, 2018, 21:00:22 PM »
 

Dawid

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 smile1004kno behind your tachometer you have a second small Cdi  unit its charging the timing of your spark after 5.500 rpm...if it has a problem you will fell like its working with 2 cylinders after 5.500 rpm.I hope I helped!!!
 

Re: Does not run well at 5500-6000rpm
« Reply #7 on: May 03, 2018, 15:10:19 PM »
 

robvangulik

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smile1004kno behind your tachometer you have a second small Cdi  unit its charging the timing of your spark after 5.500 rpm...if it has a problem you will fell like its working with 2 cylinders after 5.500 rpm.I hope I helped!!!
Hi Dawid, I think you mean the restrictor that for the Japanese market limits the topspeed to 180km/h, unfortunately that is actuated via the speedometer, and has nothing to do with the number of revs the engine makes.
 

Re: Does not run well at 5500-6000rpm
« Reply #8 on: May 04, 2018, 02:06:35 AM »
 

xpd153

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In this case, rob is right. There is no sub cdi in the gauge.
The speed restrictor is designed for Japanese market model and all CBR750s are basically JDM(Japan Domestic Model).
  If your car or motorcycle is gray imported one, it may have similar speed restrictor. Even it is Nissan Skyline GT-R(R32,R33,R34).

 However, low powered vehicle which can not reach 180km/H, does not have such restrictor. Like K-cars, single cylinder motorcycles. I think.

Anyway, I guess original topic starter does not have this problem and RC27 any more.
 

Re: Does not run well at 5500-6000rpm
« Reply #9 on: May 04, 2018, 11:36:15 AM »
 

robvangulik

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Maybe, maybe not, Berra, the TS, lives in Sweden, and the riding season is short there.
So in the 5 years since posting he had only some 25 months to ride, he still might have his Hurricane winkywinky
I still have the CBR i bought in 1989....