Jdeac Posted February 27, 2021 Posted February 27, 2021 Hi all. Been out for a blast today. And the motor/gearbox has developed a rattle in third gear. On power cant really hear it. But steady in third and deceleration you can hear it. Chain tension good, outputshaft bearing good. What could be the cause of this?? And should I be concerned riding it. Quote
TonyGee Posted February 27, 2021 Posted February 27, 2021 can't say ive ever heard a gearbox rattle in 3rd gear ? are you sure its not coming from the chain ? it could be the chain but only at a certain speed (3rd gear) try loosening or tightening the chain just to test the theory and see if it stops. Quote
Jdeac Posted February 27, 2021 Author Posted February 27, 2021 I shall try that. I had only adjusted the chain this morning. After the bike had a good cleaning. Quote
Jdeac Posted February 28, 2021 Author Posted February 28, 2021 So dropped the oil today. As the noise almost seems like third is partially engaged. Put a magnet in the drained oil. And see pic Quote
Jdeac Posted February 28, 2021 Author Posted February 28, 2021 What part has let/letting go hear?? Quote
TonyGee Posted February 28, 2021 Posted February 28, 2021 the only 100% way to know is to split the crankcases. you can leave the top end on though. Quote
clivegto Posted February 28, 2021 Posted February 28, 2021 6 minutes ago, Jdeac said: What part has let/letting go hear?? Sprocket bearing possibley. Usually it's 2nd and 5th that goes on the dogs. Quote
Jdeac Posted February 28, 2021 Author Posted February 28, 2021 @TonyGeeThat's was my thoughts. I've never stripped a motor before! @clivegto if the sprocket/output shaft bearing had gone/going surely it would make the noise in all gears Quote
clivegto Posted February 28, 2021 Posted February 28, 2021 As Tony says bottom end can be split with out removing the top end so you best take it to bits for a look see yourself, I would. Quote
Jdeac Posted February 28, 2021 Author Posted February 28, 2021 Ah crap. Hear comes a learning curve Quote
TonyGee Posted February 28, 2021 Posted February 28, 2021 just beware of the hidden top crankcase bolts, Quote
Jdeac Posted March 1, 2021 Author Posted March 1, 2021 Just been flicking through the manual on my lunch break. And looking at what needs to be done. Are there any specific tools I'm going to need. Clutch tool I know but anything else. Cheers Quote
TonyGee Posted March 1, 2021 Posted March 1, 2021 1 hour ago, Jdeac said: Just been flicking through the manual on my lunch break. And looking at what needs to be done. Are there any specific tools I'm going to need. Clutch tool I know but anything else. Cheers no not really, you dont need to take the starter clutch of but if you do you would need a special tool. just a clutch holding tool but be carful when refitting the clutch, make sure ALL the gears are engaged as they easily break if not !!!!! theirs a hidden bolt inside the genny hole. Quote
SiBag Posted March 1, 2021 Posted March 1, 2021 @fatblokeonbanditdid a nice writeup of how to change the gearbox without taking top end off. Off another form I think. Quote
Lachie04 Posted March 1, 2021 Posted March 1, 2021 TIP: there's a bolt hole at the back of the case an at recess at the front to fit a 5-6mm nut and bolt to help pry the cases apart. I don't think they tell you that in the manual (thanks to @fatblokeonbandit) Quote
Jdeac Posted March 1, 2021 Author Posted March 1, 2021 Thanks for the tips guys. I shall probably pull the motor out on the weekend. Just do small bits in the evening after work until its ready to drop. Pulled the exhaust of tonight and the sump for a little look. I know there is loads I cant see. But anyone see anything? The small lever part on the end of the selector drum has some material on it. Quote
TonyGee Posted March 1, 2021 Posted March 1, 2021 its hard to tell from the pick, but i think its defo in need of a strip down before things get any worse !!!! are the bits of metal steel or aluminium ? Quote
Jdeac Posted March 1, 2021 Author Posted March 1, 2021 I get what your saying. And the parts are magnetic so steel. As above I'm just going to pull it apart slowly. I've never done anything like this before. So took a couple of pics. To see if there was anything that stood out. After the sump was off I found a piece of metal about 2 ish mm long. Fresh metal one side and black in colour the other. I'll probably put the motor in out of my project build for now so at least I will have a bike to ride. Then this one will (hopefully) get built for the project Quote
Jdeac Posted March 1, 2021 Author Posted March 1, 2021 Also anyone recommend a clutch tool. As I dont have one Quote
TonyGee Posted March 1, 2021 Posted March 1, 2021 (edited) you can get cheap clutch tools on the bay. i wonder if a bearing has let go ? years ago i had a noise on my gsxr1100 so when i stripped the bottom end i found the output shaft inner needle roller bearing had collapsed and the outer roller bearing outer race had cracked in 2 places, just held together by the cases !!!!!!! it also fecked the inner bearing surface on the shaft. luckily i was working for a Suzuki dealer at the time so got my bits cheaper. i blame too many wheelies Edited March 1, 2021 by TonyGee Quote
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