Hi everyone.
 

I’m new to this hole forum thing and hoping like hell someone can help me. After many years of raising kids I have finally gotten around to buy my high school dream bike. 1999 CBR900RR..
now to get to the point. I have a problem nobody seems to be able to help me with. My bike looses power around 4500rpm only when I’m riding. If I rev in neutral it revs up perfectly. The problem only happens while I’m riding.
I can’t get her to pass 120kph. I have had the carbs checked and equalized, new plugs, checked the coils and the resistance in the plug leads and made sure the firing order is correct. Compression is fine. I have tested the battery and the rectifier seems faulty as the voltage climbed as a revved up to 5000rpm. Voltage climbed to 18.9V at 5000rpm.
I’m also thinking It could also be a fuel supply problem and thinking to replace the petcock.
Any advice would be greatly appreciated.
David
South Africa

Yes get that Rec/Reg changed or you will kill your battery, also check stator

Thank you I ordered a new rectifier and will check the stator. Do you think this is what is causing the bike to Bog when riding?

Its a very good place to start

Thanks
 

Just want to thank you for the advise. New rectifier, starter solenoid and battery. Problem solved. Much appreciated

Well done matey glad you sorted it:)

Hey bud , congrats on getting the kids out to get the baby in lol
I recently did the same thing , about 3 years ago. Love the kids but couldn't wait till they were old enough to get along with out me should any thing happen while I was riding.

Glad you got it sorted out.
Enjoy the ride.

Glad to see a happy ending to the problem.
Welcome to the forum!