August 4th, 2012, 11:19 AM | #1 |
wat
Name: wat
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blown transmission #2
blew the main output shaft bearing. also the used ebay transmission i bought has a bent output shaft. so i'm going to combine parts from the two since i have a straight output shaft and the other one has good bearings. already cleaned everything out and had put the "new" transmission in which supposedly was in perfect condition (****ing ebay liars) and notice a slight click when rotating the two gear sets together so i examined it more closely and its just slightly bent.
anyway heres some pics of the damage... you cant really tell from this angle but inside the bearing the bal cage is completely destroyed and pretty much disintegrated luckily nothing else was damaged by the debris
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August 4th, 2012, 11:27 AM | #2 |
Jigglin' your Jiglets
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I envy your mechanical knowledge
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August 4th, 2012, 11:29 AM | #3 |
wat
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someone tells me its actually my lack of mechanical knowledge that gets me into these situations... sometimes i think that person might be right.
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August 4th, 2012, 11:31 AM | #4 |
wat
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oh i forgot to mention. one of my chain links had started to freeze up and i thought it was acceptable to leave it for a little bit longer. i guess i was wrong. pretty sure it was freezing up because i pressed the master link too tightly. so there you go... improper chain link pressing and boom goes your tranny. but then i have been known to jump to conclusions.
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August 4th, 2012, 11:33 AM | #5 |
Jigglin' your Jiglets
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Well your miles ahead of me, the most involved thing I've done is carb work
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August 4th, 2012, 11:38 AM | #6 |
RIP Alex
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Damn and I thought I had some bad luck! How much did the eBay tranny cost you? I'd dispute the transaction or recoup some money back if it were possible.
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August 4th, 2012, 11:42 AM | #7 |
wat
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it was like $50 and came with a new internal breather protector thing (mine was damaged) and crank balancer and some other parts besides the transmission... really the only thing damaged was the output shaft itself. i'll keep the set for parts in the future. maybe i can get a buddy to straighten the shaft or something.
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August 4th, 2012, 12:13 PM | #8 |
Daily Ninjette rider
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Sorry to see that, Alex.
Check that the outer ring didn't spin in the aluminum. I have seen that damage in bikes abused with wheelies and over-tight chains. Improper installation that introduces an axial load on the bearing can also destroy it, but I don't think this applies in this case. I doubt that the shaft can be straighten up, but I hope I am wrong.
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August 4th, 2012, 12:39 PM | #9 |
wat
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no intentional wheelies but plenty of quick starts and a -1 front sprocket added to the load. the chain was a bit too loose but the master link was binding a bit. i think i dun broke'd it
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August 4th, 2012, 01:18 PM | #10 |
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It is hard to believe that the binding link could add enough load as to be critical; before failure, it would have produced a lot of vibration and noise, I guess.
Time for autopsy: http://www.skf.com/portal/skf/home/p...nk=5_15_022000 http://www.skf.com/files/099926.pdf
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August 4th, 2012, 01:35 PM | #11 |
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I got ceramic bearings from World Bearings for my trans. They make a full
Set for the 250 ninja. The owners wife rides a 250 Ninja. |
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August 4th, 2012, 01:52 PM | #12 |
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so, how is this happening? So others can avoid doing, whatever it is, that you are doing
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August 4th, 2012, 03:21 PM | #13 |
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In my case I was on the dyno. I made a hard pull and turned off the motor. I wanted the talk to the dyno operator.The rear wheel was spinning and so is the chain and output shaft. Half the gear cluster is spinning when the engine is off and the rear wheel is turning. The problem is the engine oil pump lubricates the transmission as well as the engine. So turning off the engine cut the oil to the trams and it locked up.
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August 5th, 2012, 08:36 AM | #14 | |
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So is coasting engine off something you should never do? |
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August 5th, 2012, 08:49 AM | #15 |
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August 5th, 2012, 09:41 AM | #16 |
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If you tow a bike like that you should remove the chain. The shaft that has the output sprocket is turning on a ball bearing. But inside the gears are turning on the shaft. When I turned off my engine the fifth sprocket welded itself to the output shaft.
I don't think drifting a short distance will hurt anything. On the dyno there is a 1000 lb drum . It nearly slows down. When you. Shut off your motor on the street . The bike drifts to a stop quickly. |
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August 5th, 2012, 10:25 AM | #17 | |
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i know there is less friction with these, but will they withstand more load than the standard bearing? |
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August 5th, 2012, 10:45 AM | #18 |
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August 5th, 2012, 10:56 AM | #19 | |
wat
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Quote:
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August 5th, 2012, 10:59 AM | #20 | |
wat
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Quote:
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August 5th, 2012, 01:03 PM | #21 |
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Alex, you and me seem to have a bad habit of buying stuff from ebay that turns out to be crap.
Coasting a quarter mile may not be that good for it, but I have a hard time believing that it would cause the kind of damage you have. The tranny uses ball and roller bearings. Even with the oil pump off, I believe that there is still plenty of oil on the balls to run without out damage for 30 seconds or so with no load. In your case, I believe that its related to the constant pounding from the bad link and also possibly because the chain may have been too tight. This is exactly the kind of damage I would expect from an excessively tight chain. Anyhow, good luck with it. I know it sucks for sure.
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August 5th, 2012, 02:18 PM | #22 |
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I agree. A bad link will pound a ball bearing to bits. I really don't think coasting for even a quarter mile will hurt anything. What I did on the dyno was a fluke.
I don't think ceramic would be better. Maybe worse. But you should not have a stuck link in the first place. |
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September 11th, 2012, 03:53 PM | #23 |
wat
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she lives.
not a single trip to the machine shop, either. kinda funny. the engine right now is spotlessly clean while the rest of the bike is dirty dusty and covered in ****. thats kinda rare!
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September 11th, 2012, 03:57 PM | #24 |
Jigglin' your Jiglets
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Jesus ****! Finally!
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September 11th, 2012, 04:02 PM | #25 |
wat
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oh i forgot the best part.
i couldn't get the old remains of the bearing off with all the pullers and clamp presses i could get my hands on. i had a dream about it and i implemented the solution the dream gave me. the dremel cut the bearing race off in about 30 seconds. something i had tried to do "properly" the past month but failed. lesson learned: if it doesnt come off and you dont need it anymore, cut the ****er off.
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September 11th, 2012, 04:42 PM | #26 |
Fix It Till Ya Break It
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Alex's guide to owning a 250:
1. Blow transmission up 2. ????? 3. Profit! |
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September 11th, 2012, 04:43 PM | #27 |
Lays er down
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is that the same bike you crashed in ur avatar?
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September 11th, 2012, 04:51 PM | #29 |
Lays er down
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dam man. good job. wish i could do that stuff.
and very nice yoshi |
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September 11th, 2012, 06:30 PM | #31 |
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@alex.s - Just don't be tempted to put cheap Chinese bearings in there. They are half the price of European bearings, but only last a few weeks.
Glad its back up and running.
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September 12th, 2012, 09:17 AM | #32 |
wat
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I used a used oem bearing but something tells me ill be replacing it again at some point
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September 12th, 2012, 10:14 AM | #33 |
Wartown, USA
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Can you change out that bearing without splitting the cases and opening up the bottom end? Just curious, I looked at mine last time I had the sprocket off...looked like I would have to press it out from the inside. Assuming it was still intact.
Fortunately, mine is still good, but this would be good to know. |
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September 12th, 2012, 10:48 AM | #34 |
wat
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the bearing locks into the case, so the case has to be split. you cant get a good grip on the bearing without disassembling the outer transmission half on the output shaft, so that needs to be disassembled. and if the bearing itsself is shattered, you wont be able to grip the bearing to pull the pressed on sleave for the outer oil seal, so you will need to cut it off in order to remove the broken bearing race.
the easy solution is buy a new transmission output shaft with a new bearing. if you are cheap like me, the new bearing is only $15. instead of $100 for a used transmission its worth noting though there was other damaged caused by the transmission shaft knocking around, most notably the oil vent crankcase breather thingymabob on the inside of the case got all jacked up and had to be replaced
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September 12th, 2012, 11:42 AM | #35 |
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Does anyone know how the oil breather thing works? Seems like they could have just used a PCV valve which is simpler.
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September 12th, 2012, 11:51 AM | #36 |
wat
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umm, theres a metal box that gets bolted to the top of the case.... hes got something inside... and a tube that runs to the bottom of the case.... outside of that, err... well... i have one i can cut open
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September 12th, 2012, 11:54 AM | #37 | |
wat
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Quote:
1. Crash 2. Blow transmission up 3. Crash again 4. Blow transmission up again 5. ????? 6. Profit!
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September 12th, 2012, 12:16 PM | #38 |
CVMA #74 WSMC #750
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Wait...so does this mean you're in for September's round?
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September 12th, 2012, 01:18 PM | #39 |
ninjette.org certified postwhore
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I saw that thing in mine, but have no clue what it does to the oil or how it works. Seems like it siphons oil into that little tank somehow.
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