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Help Me Fix ItA great place to post any problems you maybe having while working on your motorcycle. Most of us are do-it-yourselfers so this is a great way to share any information pertaining to fixing something or adding something on.
Noise #1 is apparent between 2500 and 3500 RPMS only, it dissipates as it gets above 3500 RPMS. It is a slight ticking sound, and sounds like it is coming from the head area. It isn't detonation and it is RPM dependant, so it is not transmission issues. The only catch is it is LOAD dependant. If it isn't under load, and being freely revved at 3k RPMs the noise is barely heard, almost unnoticeable, but gets louder when in gear. Loudest when in WOT. Safe to assume it could just be valve lash?
Noise #2 is audible at any RPM in any gear, but ONLY when under acceleration. Gliding in gear the noise is not there at all, only when accelerating. It is a whirring/whining sound coming from the left side transmission case, most specifically around the front sprocket area. The noise almost, ALMOST sounds like an air leak on the intake, but I would assume it would make the noise all the time when WOT, in gear or not. It has an unhealthy almost grinding sound to it, like scraping rusty bearings together under water. Unfortunately, because the noise is only made in gear under acceleration, it is hard to pinpoint from the riders seat. It is definitely sprocket side, and lower case. The noise appeared today after a 6th gear pull all the way to redline on a Dyno. Any ideas?
Noise one is the Cam Chain Tensioner a known Honda POS. I have posted numerous times on how to fix this item for $1.50 or you can replace it for $70. Your choice.
Noise #2 could be a bad bearing on the out put shaft (lets hope not). Jack up the rear and spin the rear wheel by hand and listen for noise.
When was the last time you cleaned and lubed the chain?
How many miles on the chain and sprockets?
That's quite possible, I was checking the sound in each gear and it remained fairly constant. I will check the tension on it, it did bounce around a bit as he was shifting. Maybe I am hypersensitive, but I swear I never heard it before, and it is loud enough I think I would have. It sort of sounds like what an automatic car transmission sounds like when it is dieing...that high pitched stressed sound.
Dammnit! When you say its load-dependent I immediately think a bad exhaust header gasket. I can't really offer more than that. It might be a cheap way to troubleshoot and eliminate that possibility.
For a $1.50 you say, ehh? How to do...I never read any of this cheap fix, sorry
I'll do the spinning of the rear tire tomorrow. I'm assuming I'm listening for crunchy sort of sound from the output shaft?
I have given this idea to a local motorcycle shop and the technician has used it on numerous bikes with great results. You can use this idea with other bikes as well as long as they are build like the Honda CCT
Here it is again
Honda Cam Chain Tensioners, yes they suck big time but there is a $1.50 fix for the later Hondas, F3 and up. If the CCT has a plug (bolt) at the outer end remove it. Buy a 6X1X30mm bolt and nut. Thread the nut on the bolt and install the bolt into the hole that the plug was in. Gently (fingertip pressure only) rotate bolt until it makes contact with the piston. Hold bolt with wrench and tighten nut against the CCT case. Your CCT will now be silent. Why does this fix work? The CCT in the Hondas does not have a ratcheting mechanism. It depends on a left handed threaded shaft that is spring loaded. Due to the locking pitch thread design this shaft cannot back up. Sounds good so far. Unfortunatly the shaft stays in one place so long that the constant vibration wears out the shaft or the nut that the shaft rides in. The shaft gets sloppy and does not exert enough pressure on the chain pad so the chain starts to rattle at high rpm. The bolt fix exerts just enough pressure on the threaded shaft that it prevents the shaft from vibrating and backing up thus eliminating the chain noise. There is a F4I that has been using this fix for 60k miles so far with no issues.
CBR900RR noises, both new.
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