was about to go for a run today but when i started my bike to let her warm up i noticed there was a very metalic rattle noise. first thought was some thing like a stone sitting on top of my exhaust but when i looked there was nothing. left her to warm up and see if the noise went away but it never i have no idea what it is any help cheers.

 

could (hopefully) be a peice of your baffler that rusted off and fell down. pull your manifold off and shake it out to hope for the best. Sound clips?

 

https://cbrforum.com/forum/f2-tech-93/cct-replacement-fix-engine-rattle-good-91238/

 

i have had the exhaust off because i thought poss my daughter had put stones down the pipe(would not be the first time the little sh*t). also i hope its not the cct or the a.p.e tensioner i bought about 2 weeks ago and had installed by a garage is going back.

 

The APE cct needs adjusting?

 

The CCT does require adjusting, but not after 2 weeks... Perhaps the garage did not install it correctly or the locking nut has backed off.

Try setting the tension on the CCT again and see if that cures your problem

 

Well after getting a second ape tensioner and getting it checked twice. I have now discovered the problem. Where the down pipe goes 2 into 1 there was a bit of metal in there as part of the exhaust no idea what its meant to do but the weld on it broke and thats what was rattling about. Here is a photo of how i had to get it out and what the bit of metal it was. Its all welded back up now so just have to worry about getting the broken stud out the head now and get it back together.

 

Hah, I just pulled a snapped stud out of an F2 head... HAVE FUN is all I can say.

Buy about 3 sets of drill bits, because you're going to snap every single one of the bits that are smaller than 1/8"

Buy a heavy duty easy-out set, easy outs are the best way to remove the snapped stud, unless there is enough stick-out that you can manage to grab it with vise grips.

 

there is about 10mm sticking out so going to warm it up with oxycetelene torch and get my vise grips on it fingers crossed that will do the trick. i broke one when i changed my system but got that one out easy cause engine was still red hot.

 

I'd be careful with acetylene, it is much hotter than say a propane torch... If you have propane I would use that instead