[187mustang]

I started my bike up today and when I revved it up I noticed that the Exhaust valve was much noisier than usual aroung 4K rpms and after that it quiets down again. Is This a sign that I need to replace it? IS it getting too worn out? Will it affect performance? or should I just forget about it and drive it? I know the bike is a known for noises but its pretty loud now and I dont like it. I let it warm all the way up too 217 and it didnt get any quieter. its olny when I rev it up even If I rev it slowly you can hear it start to rattle then it quiets down.

Thanks for all the help

[929Fregm]

Check the adjustment of the cables, maybe it has broken? Mine is somewhat noisy,so I adjusted it and it helped some,not much. If you need the manual, do a search on fireblades.org and you should be able to find it,If you can't email me and well work something out.You should have it to adjust it correctly. Good luck.

[Atomicpunk]

Looks like it's time for a new full exhaust

[Fastrr]

I've found a lot of times when a noise is present at only a certain RPM it's due to vibration. Possibly a cable that likes to now vibrate at 4,000 rpm Maybe a part on the valve assembly needs to be tightened a little. Just my best guess here. If your bike's problem ends up being a vibrating exhaust valve cable, try using a zip tie.

My airbox has a wicked vibration at certain RPM's - it rubs on the bottom of the fuel tank. I plan on adding some foam rubber to the bottom of the fuel tank next time it comes off for maintenance.

[187mustang]

Thx I have to do an oil change on it So I'll inspect closely when The time comes.