catrike16 Posted February 12, 2017 Share Posted February 12, 2017 Hi All, I went out for a short run yesterday, as I came to a stop I noticed a loud knock, loud enough to make me stop and look for a second, it came from the front forks area. I now have a noticible knocking sound when I use the front brake and the forks compress. I hadn't noticed it before, the bike is still in its run in period. My past few bikes have been BMW so this sound is alien to me, it may not be to others though! Any thoughts, normal? Anyone else experience this?? Cheers ? Link to comment Share on other sites More sharing options...
Premium Member wessie Posted February 12, 2017 Premium Member Share Posted February 12, 2017 I hear it too when coming to a standstill at lower speeds e.g. at a red light in town. My theory is that it is the floating disk moving - you have the brakes applied and the suspension dips as you stop. Once fully stopped you still have the brakes on but the suspension recovers to the static position. This changes the load on the floating disk so it moves and you hear it knock as it reaches the end of the movement range. My bike has done it since new and has 16500 miles now so it is not something I worry about. This signature is left blank as the poster writes enough pretentious bollocks as it is. Link to comment Share on other sites More sharing options...
xlxr Posted February 12, 2017 Share Posted February 12, 2017 I usually ride with ear plugs, but did a short ride last week without ear plugs. I did not hear any such knocking, maybe you should check rotors for excessive play. I would also check all bolts in the fork and steering head bearings for proper torque. Link to comment Share on other sites More sharing options...
koth442 Posted February 12, 2017 Share Posted February 12, 2017 Stem nut inside the triple could be loose. '15 FJ09 Link to comment Share on other sites More sharing options...
fj09chris Posted February 12, 2017 Share Posted February 12, 2017 Stem nut inside the triple could be loose.This Link to comment Share on other sites More sharing options...
eeetea Posted February 14, 2017 Share Posted February 14, 2017 You should not be getting any knock sound. And it sounds as if something isn't right. Check it out and resolve before riding again. Check that the caliper bolts, and fork yokes (you colonists call it something else I think... Triple widget or something?). Yes these bikes do have floating discs, but I have never heard them clunk, but imagine they could if they are worn....so even if it is from the disc I would get your dealer to check it out. Honda SS50, Kawasaki Z200, Honda 400/4, Yamaha TDM900, Yamaha XT660Z Tenere, KTM 990 Adventure, BMW R1200GS, Mr Stevens, and my favourite of all: Yamaha MT-09 Tracer...a bit like FJ-09 only properly named :¬P Link to comment Share on other sites More sharing options...
Premium Member keithu Posted March 7, 2017 Premium Member Share Posted March 7, 2017 I sometimes here a clunk from the rear brake when I first start to slow. It has done this the whole time I've had the bike. I've inspected and reinspected; everything is tight. I'm sure it's just the brake pads clunking in the caliper. Link to comment Share on other sites More sharing options...
Premium Member keithu Posted March 7, 2017 Premium Member Share Posted March 7, 2017 Another possibility is that the rear shock is making the noise as it extends under braking. Could be stiction or something. I'm still running the crappy stock shock. Link to comment Share on other sites More sharing options...
stuna Posted March 7, 2017 Share Posted March 7, 2017 steering bearings Link to comment Share on other sites More sharing options...
rocky5000100 Posted March 7, 2017 Share Posted March 7, 2017 Mine has been making a noise since new. It makes a small clunk noise if you are stationary and push down on the front end, while holding the front brake. Can't tell if it is the forks or steering, but I've always had it. I'll have someone push for me sometime while I listen for the area it's coming from. Link to comment Share on other sites More sharing options...
kimofj Posted March 9, 2017 Share Posted March 9, 2017 ABS kicking in Link to comment Share on other sites More sharing options...
catrike16 Posted March 10, 2017 Author Share Posted March 10, 2017 Had it in for the first service, the dealer says it's the floating disc's thoughts? Link to comment Share on other sites More sharing options...
catrike16 Posted March 10, 2017 Author Share Posted March 10, 2017 As I brake, usually when stopping But I have also had it driving along at 50 and then braking. Surely if it's the floating disc/caliper why doesn't it happen all the time? Link to comment Share on other sites More sharing options...
catrike16 Posted March 11, 2017 Author Share Posted March 11, 2017 It had it first 600 mile service on Wednesday, the dealer says everything is fine. I am confused though as they definitely said it's the floating rotors. If the bike doesn't have floating rotors, surely they should know? Link to comment Share on other sites More sharing options...
desertfjr Posted March 11, 2017 Share Posted March 11, 2017 piotrek, sorry to burst your bubble, but the discs are floating. If you look closely the disc is "attached" to the wheel via 6 (I think) little round button looking devices. The inner portion of the disc support has "half of the moon" that goes around that item, the rotor itself, the other half. That joint allows for expansion and contraction and helps with rotor alignment through the caliper. 5 fasteners bolt the inner mount to the wheel. It can and has become worn on other Yamaha models. Replacement can often get rid of any noise. Link to comment Share on other sites More sharing options...
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