CBR 900RR SC33 loud engine noise at low rpm
Hello guys (Sorry for my poor English skills).
After reading a million threads in here and discovered that here are some very talented people, I hope there are some of you guys who might help me out here.
I have recently purchased a Honda CBR 900RR 1995 model SC28 which has been installed with a newer 1999 SC33 engine.
My problem is that the bike drives like crap between idle and 4K rpm. The engine is making a loud ticking/knocking/sputtering noise (really hard to explain) during heavy acceleration, and it has a lack of power too. The bike does this only between idle and exactly 4k rpm, in all gears, but only under heavy load (more than half throttle). After 4k rpm the bike takes off like a rocket and drives like a dream without any noises at all.
I have had the bike at tree difference mechanics , and none of them could tell what is wrong. only guesses like valve adjustments, wrong ignition timing, worn main bearings,
I have made these things recently:
The cylinder head has been removed and everything is measured and checked. Everything looked very fine. New head gasket, and the head are on again.
I have checked the chain tensioner and the cam chain guides which look pretty much like new and work fine.
The valves are adjusted.
Change the old 1995 sc28 CDI Box a SC33 1999 model.
Carburetor cleaned and synchronized.
Despite this the noise and lack of power remain the sameL
However; I just noticed that the carburetor is the old SC28 1995 model which is without TPS.
Before I spend a lot of $ on a new sc33 carburetor whit TPS I would like to hear your opinion. How do a Blade sc33 runs if you unplug the TPS? Is it possible that this is the problem or should I look elsewhere for this problem?
I really hope to solve this problem soon.