Hey everyone im Shane I have a 99 CBR 900RR which I love. I have always been in love with CBR's just never came across the right deal on one until the other day. Which is the 900RR I speak of lol I couldn't pass it up but it has 200 miles on the rebuilt engine and the previous owner couldn't figure out what the knocking noise is so now its on me to figure out....lol he was riding it and out of nowhere it just started knocking I checked the cct and valve clearance and its all good and working properly could it be a bad rod bearing or something else?

 

I thought you said it was a rebuilt motor? What all was done? Any oil in the airbox?





Welcome to CBRF, btw! I'm sure you'll get it sorted. Maybe post a video of it (using photobucket links). That'd help. If you're certain it's some sort of motor noise, the best thing to do would be to get an automotive stethoscope and pinpoint where the noise is actually coming from. They're $13 at Harbor Freight.



I guess you'd need to know how it was rebuilt before you go guessing. It could be a rod, it could be piston slap, it could be a stuck/bent valve

 

yeah it was rebuilt before I bought it the guy I bought it off is getting me the shop info so I can talj to them ges not sure what all was done

 

Welcome.

Knocking noises are bad. Hopefully its not the motor coming apart.

 

And also, check into the shop yourself. I find it funny that the guy had the motor rebuilt, and then sold it to you for a real cheap price. Who knows what's wrong with it. It could be anything. It could be something that a mechanic at the shop forgot to do even - or a missed torque spec..

Try to post a vid. of it running. Demon is a really knowledgeable mechanic - and we have a few others on the forum too. I'm sure they can help.

 

Welcome to the CBR Forum Shane,

Is the knocking noise a deep rumble (bearings) or a more higher pitched tap that goes away with acceleration (piston slap), or rattle that goes away when the engine warms up (tensioner) or none of the above?

Good luck solving the problem.

Cheers, SB

 

Welcome to CBRF...

 

Welcome aboard!

 

hi and welcome

 

I just wanted to let everyone know that I figured out what was wrong with my bike.....come to find out its a rod bearing and in the box of spare parts that came with it I have 3 sets of them like brand new so awesome so hopefully by next weekend I will be riding again thanks for all your input I really appreciate it.