View Full Version : Bleh my WR450 06 died.....:(
nitronaf
10-07-2009, 05:23 PM
So yeah im testing out my new gearing on the freeway.
and im going about 140km and the rear locks up and engine cuts out........
pull the clutch in
rear still locked.
fishied for about 200 meters before coming to a stop
after many swear words.
i tried to put it into neutral...gears are select 1st to 5th but no neutral???
after a few minutes i could disengage the clutch and move the bike.
i started it. runs fun. but when i went to take off the rear is still locked
im thinking i blew the transmission
just pulled the outer side covers off and checked, clutch basket, clutchplates, pressure plate, starter clutch, starter motor, stator and all seems fine.
even the oil had no metal chunks or milkiness to it.
and now i cant select gears after taking the covers off.......
lol i had to hide the bike in the bushes and hitch hike in full leathers CUZ MY FONE DIED TO. some good people out there!
FrenRob
10-07-2009, 06:04 PM
unlucky bloke..Yamaha's huh..:D
mr_tyreman
10-07-2009, 06:23 PM
hittin the skids at 140km/h....glad to hear your still in one peice :)
shame bout the motor tho.....and that poor tyre.
nitronaf
10-07-2009, 06:26 PM
unlucky bloke..Yamaha's huh..:D
over 30,000km i aint complainin ^_^
nitronaf
10-07-2009, 06:29 PM
hittin the skids at 140km/h....glad to hear your still in one peice :)
shame bout the motor tho.....and that poor tyre.
yeh it was on a wet road thank god
guess all the backing it in practice paid off? lol
the tire is pretty screwed. one big flat spot.
musta looked hella cool from behind tho!!!
kakoii
10-07-2009, 06:31 PM
'I once did a skid for two weeks' comes to mind :D
mr_tyreman
10-07-2009, 06:39 PM
hahaha good times ^^^^
Wobbly
10-07-2009, 07:19 PM
Bugger :(. Yep, it's gearbox, will most likely be either a few teeth off one of the gears causing lack of synchro or broken dogs getting jammed. Did the same on my drz. Coincidently after about 30k kms :)
Fazio
10-07-2009, 07:21 PM
reminds me of when the rm motor seized, that was a good skid as well!
best of luck fixing her mate
yamaha gearboxes are fairly weak, i just had to get a new selector fork and 3rd and 5th gears, after nearly 5000km on my 06 model.
when i did my gearbox the bike ran fine and there was no metal in the filters etc.
id recommend you split the cases and check out the gear selectors, they may be bent and trying to select many gears at once.
nitronaf
11-07-2009, 01:19 AM
yamaha gearboxes are fairly weak, i just had to get a new selector fork and 3rd and 5th gears, after nearly 5000km on my 06 model.
when i did my gearbox the bike ran fine and there was no metal in the filters etc.
id recommend you split the cases and check out the gear selectors, they may be bent and trying to select many gears at once.
wow i hope its only that! YAY YOU GIVE ME HOPE!
bandy
11-07-2009, 04:38 AM
I'll be interested in the outcome nitro.
The gearbox going bang is in the back of my mind all the time
on my 05' 450.
Hope the rebuild goes well.
nitronaf
11-07-2009, 05:01 PM
where's Jov :)
wat?
Ash007
11-07-2009, 05:45 PM
I think if you get 5000k's out of a gearbox that is essentially in a race bike your doing well. 30000km's is an awsome run.
motardboy
11-07-2009, 05:54 PM
man that sucks! I guess a ride 2moz is out of the question!
I think if you get 5000k's out of a gearbox that is essentially in a race bike your doing well. 30000km's is an awsome run.
yeah thats what i thought. i did give the gearbox hell though in those 5000km, so it was expected. they seem pretty disposable in the yamahas, the old man said he never got a season out of the yz 's one when he raced mx, and hes not tough on gear.
nitronaf
11-07-2009, 09:57 PM
just got the topend off
wow topend looks great. still has cross hatching!!!!!!!!!! no scratches, no blueing, nothing out of the ordinary.
haha i knew my babying the bike would pay off!!!
after inspecting my balance shaft the female square hole for the waterpump shaft has been rounded about 350 degrees. bloody hell these are expensive :(
thats about the only problem ive found so far. however i did run out of tea....hmmm
With the YZ boxes, i think your either really lucky or really unlucky.
My bike will be geting new selector forks in 3rd & 4th aswell as getting th gears back cut and polished shortly due to jumping out of gears......
But a Mates bike which is the same year and has done almost exactly the same amount of work is perfect......
All at just on 20 hrs too.
Ash007
12-07-2009, 01:08 PM
With the YZ boxes, i think your either really lucky or really unlucky.
My bike will be geting new selector forks in 3rd & 4th aswell as getting th gears back cut and polished shortly due to jumping out of gears......
But a Mates bike which is the same year and has done almost exactly the same amount of work is perfect......
All at just on 20 hrs too.
Are you running a slipper clutch?
nitronaf
12-07-2009, 03:39 PM
id go for a WR tranny if i were u! :D
Yeah and i even clutch for downshifts......
I spose i'm just one of the unlucky ones.
bandy
15-07-2009, 02:32 AM
you haven't pulled the donk down any further yet nitro ?
I'm real keen to find out what happened mate,No doubt your self too , hey.
Gonzo
15-07-2009, 10:27 AM
Are you running a slipper clutch?
Or even a cush drive?
oldskool640
15-07-2009, 10:45 AM
this was related to me by a yamaha mechanic back a couple of years, about the virtues of a wr450 over the kato lc4.
his assesment was the wr450 was a weapons grade engine and bike package with an important weak link in the drive train - the gearbox, prone to detonation due to a weak design.
one of the problems as he saw it was the lack of a cush drive rear hub. (rubber blocks that fit inbetween the sprocket side of the hub and the wheel side of the hub to absorb those snatchy gear changes and smooth out things for the weak transmission. although not so much a problem on dirt, cause of the opportunity for the rear wheel to spin in the mud/ dirt, a conversion to a 'tard using a standard wr450 rear hub would eventually stress out the transmission with the constant gear changes and general mayhem that a 'tard pilot gives his steed on the tar.
he had seen several gearbox failures at the time we had our chat.
the kato lc4 on the other hand isnt inhibited by this lack of design engineering for the gearbox and also has cush drive rear hub. i bought a kato. 8)
maybe your bikes problem, maybe not :confused:
MarkeeMark
15-07-2009, 11:18 AM
its a yamaha thing
Like gold wheels, hey Jov? :D
Muzzard
15-07-2009, 12:06 PM
So am I now safe with black wheels on a red bike Jove :confused:
nitronaf
15-07-2009, 04:09 PM
i dont have gold wheels >_<
just hubs :D
nitronaf
15-07-2009, 04:10 PM
you haven't pulled the donk down any further yet nitro ?
I'm real keen to find out what happened mate,No doubt your self too , hey.
nah mate waiting for a case splitter from marty :D (good lord hes affordable)
nitronaf
22-07-2009, 04:31 PM
Ok so i got my case splitter today and split the cases
at first i was confused as nothing looked like it was wrong, no metal chunks, no shavings, nothing out of the ordinary. however whilst moving the case half with the transmission in it, a small metal tooth fell out.
So after inspecting closer i found that the 5th gear pinion was missing a tooth.
i pulled the transmission out and inspected both pinions that have the possibility to mate with the broken pinion. found nothing. Inspected with magnifying glass. Nothing.
So i think i got off pretty easy. if that tooth un-jammed from its position i'd hate to see my repair bills. :eek:
Basically what had happened is a tooth from the 5th gear pinion broke off and jammed itself between the next tooth (there is a tooth shaped indent) and the mated pinion gear on the other shaft effectively becoming a "gear jammer" and locking the rear wheel :down:
other damage seems to be only a rounded out keyhole for the waterpump shaft,
I've attached a couple of pics of the broken gear. and a shite blurry one of the broken tooth next to a ten cent piece
so none of the selector forks were bent? mine must have got bent because i was riding the wheels off the bike that day...
nitronaf
22-07-2009, 04:49 PM
naw not that i can see
i've still to check everything with my vernier and micrometer
ah thats cool then.
i could tell mine were bent because there was nice wear marks on them from the gears rubbing on the wrong angle.
Wobbly
22-07-2009, 08:00 PM
Have a look at the faces on the teeth and see if you should replace some of the gear clusters pre-emptively. They're normally not too deadly, prob around 100 bucks a gear...
bandy
23-07-2009, 02:00 AM
Shit hey , So is that the drive or driven 5th gear that failed.?
Yeah, could a been a lot worse.
how many k's you got on it nitro?
jeez, seems like you got off pretty lightly on that one!
nitronaf
23-07-2009, 12:55 PM
Shit hey , So is that the drive or driven 5th gear that failed.?
Yeah, could a been a lot worse.
how many k's you got on it nitro?
i have over 30,000 km on it
well yamaha calls it the "5th gear pinion" and the gear that it meshes with is technically the "5th gear"
thats the one that gets power from the crank shaft.
the meshed gear is the one that drives the front sprocket shaft.
jeez, seems like you got off pretty lightly on that one!
yeh its gonna cost more to fix problems i stumbled across while having the engine apart (waterpump) than to fix the main problem lol
nitronaf
23-07-2009, 01:22 PM
Bugger :(. Yep, it's gearbox, will most likely be either a few teeth off one of the gears causing lack of synchro or broken dogs getting jammed. Did the same on my drz. Coincidently after about 30k kms :)
god hes good got it 100% right
bandy
12-08-2009, 02:57 PM
Done anymore on the rebuild lately nitro ?
nitronaf
12-08-2009, 03:34 PM
nah waiting for more parts.....
oh i forgot to update this thread! haha
Well i found, after much head scratching even with an expert motor builder that the 2nd gear wheel was seized to the countershaft which is most likely the ORIGINAL problem and the 5th gear just shat itself cuz that was the gear i was in.
I just thought the gear was not supposed to spin haha!
And so i ordered parts off marty a few weeks ago however Yamaha AUS does not have a countershaft in stock.
Now im holding my genitals waiting for parts! yay......
Gonzo
12-08-2009, 03:59 PM
Now im holding my genitals waiting for parts! yay......
I know the feeling.
Looking like I might not get the KTM back in time for this weekends track day.
Track day on the XR? why not :up:
MarkeeMark
12-08-2009, 04:46 PM
Bring it Gonz! You coming to Marulan?
Gonzo
12-08-2009, 05:02 PM
Once I work out how to tell my wife I am :D
come on gonzo the honeymoons over ,just lie like the rest of us do,and yes he is going to marulan ill kidnap him if i have to.
playwme
16-08-2009, 10:21 PM
nah waiting for more parts.....
oh i forgot to update this thread! haha
Well i found, after much head scratching even with an expert motor builder that the 2nd gear wheel was seized to the countershaft which is most likely the ORIGINAL problem and the 5th gear just shat itself cuz that was the gear i was in.
I just thought the gear was not supposed to spin haha!
And so i ordered parts off marty a few weeks ago however Yamaha AUS does not have a countershaft in stock.
Now im holding my genitals waiting for parts! yay......
Same thing happened to me in my Sandman. Had just hit 3rd gear at about 70kph and suddenly the back wheels lock up and the car starts going sideways. Got it restarted and the only gear working was 1st. Turns out the 1st gear had siezed on the mainshaft. Funnily enough it didn't break anything in the gearbox. Still haven't fixed it (9 years ago) . Just put in a toploader and a 9 inch instead.
did it have an aussie 4 speed in it before? they are like plastic compared to the ford gear, even if its ford haha.
sounds like a beast of a pano mate.
playwme
18-08-2009, 09:35 PM
Yeah, it had an M21 which had $600 worth of new cluster gears and stuff only 6 months before. Pretty sure they fucked something up. 2 days after it went in and there was oil pissing out the flywheel cover. 3 of the bolts holding the plate over the input shaft were sitting in the flywheel cover and the 4th was barely fingertight. That was the last time I took anything to a mechanic. Now if I can't fix it I buy another and replace it myself.
The M21 held up pretty well though, considering the sudden stop it received. It's still sitting in a plastic tub out the farm. Have to try and press the gear off one day and see if it's fixable.
Martyd
18-08-2009, 09:42 PM
Nitro.... your stuff was couriered - you should see it soon...
nitronaf
19-08-2009, 10:22 PM
Nitro.... your stuff was couriered - you should see it soon...
yep cheers got em
thanx for the extras!!! :D
nitronaf
19-08-2009, 10:26 PM
Got the cases back together. she shifts into neutral now. everything is going smoothing and im taking my time.
Got the head/cylinder/piston and new rings on, clutch assembly, idler gears, new counter balance shaft and timing chain + guides.
and im charging my battery with my new oxford battery optimiser! THAX MARTYLICIOUS!!!
nitronaf
21-08-2009, 12:39 AM
finished my rebuild. all went well
started on first try.
now to run in my new rings & brakes :(
bandy
21-08-2009, 01:08 PM
Top stuff nitro,You obviously pretty handy with a spanner hey. :up:
Be interested in the cost of all the parts too? Pm me if you wish.
This is what worries me with my wr.
MAL
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