Thrown chain advice?

[noobi]

my bike threw the chain today.
jammed up against the case pretty well, i needed the rescue quad. thanks to the staff who got me out.

anything to check specifically. im already aware of the possible gearbox damage.
btw, i wasnt riding slowly at the time

thanks

[cheese]

Shit, did the link break? Not like your bike is super powerful!

[Pedrostt500]

Post some pics of your chain and sprockets, if they are getting worn then it may be time to replace them. it is best to replace chain and sprockets together, so they wear in together.

[flyingcr250]

Post some pics of your chain and sprockets, if they are getting worn then it may be time to replace them. it is best to replace chain and sprockets together, so they wear in together.

the chain and sprockets are fine, its the bike thats the problem:girlfight:


ha ha i couldnt resist, sorry ha ha

[cheese]

the chain and sprockets are fine, its the bike thats the problem:girlfight:


ha ha i couldnt resist, sorry ha ha

LOL!!! Tui is taking over Gas Gas marketing?

[Rupe]

my bike threw the chain today.
jammed up against the case pretty well, i needed the rescue quad. thanks to the staff who got me out.

anything to check specifically. im already aware of the possible gearbox damage.
btw, i wasnt riding slowly at the time

thanks

ouch, had you not replaced hem after the 2-man??? You checked the casings for cracks yet? need some pics really

[noobi]

the link didn't beak, it came of the rear sprocket cleanly.

The sprockets and chain are less than 5 hours old.

It didn't damage the case, due to the hydraulic clutch slave cylinder being in between the sprocket and the case.

After removing the stuck chain, the front sprocket is history, I'm not sure about the chain, but the gearbox seems to move freely when moved by hand. there's no disturbing noises. even when the kick starter is used to turn over the gearbox in every gear
I'll drop the oil and check for broken teeth tomorrow.

I thought about drinking my 2man tui after today. but i didn't

I have one pic, taken off the helmet cam footage.

[vazza]

Oh sheet. Thats not good, better buy my ktm :P

[jt119]

put the vid up of you before it did it

[B0000M]

sounds like youve probably gotten away with it.

have you figured out how you derailed your chain? was the wheel straight- eg chain adjusters set evenly

[Taz]

Where's your rear chain guide?? The one that mounts to the swingarm before the sprocket?

[YellowDog]

The 5 hour old sprokets may be a clue!

[Danger]

Likely your chain was too loose and check your rear wheel was installed straight, don't rely on the adjusters, they are often not accurate. Your better of to install your chain and sight how the links are lining up on the rear sprocket as you rotate the wheel backwards, if the links are rubbing on one side or the other you need to adjust the wheel until the chain runs onto the sprocket evenly.
If you bought a cheap chain and sprockets it could stretch enough in one ride to be too loose. Also if the rear guide is worn or you went smaller on the rear sprocket these could be factors as well.
Could have been worse if you had been running one of those so called case protectors, they tend to jam up chains real well and cause more breakages than they prevent in my opinion.
Actually on looking at your pic I can't see a rear chain guide at all?

[telliman]

somones bike is in need of some tlc me thinks

[IIIRII]

somones bike is in need of some tlc me thinks


*Cough*
We have both done a lot of riding in the last 12 months / almost every weekend
This is the Gasgas's second dnf / the first was when it fowled a plug and we didnt have a spare.
The chain didnt break , it just fell off, which indicates to me it was not correctly tensioned.
I could have been misaligned / but I doubt it.

[L Rider]

Sometimes shit happens!!:Oops: Think you were with us Dale when my bike threw its rear sprocket? For some reason it sheared a couple of bolts which had only just been checked & tightened.

Hope you've got away with minimal damage

[gasmonkey]

Chain guide Noobs,where is it?It's a hardcase bit of gear but they work.Still,a well placed log or rock will flick a chain easy.

[Geemsee]

I had a chain jump the sprockets on an old z650, it actually bent the swing arm somehow... might be a problem if yours is alloy!

[kezzafish]

no chain guide... bad idea... Did it break off? cos that could cause the derailment... Or was it not on before the derailment?

[noobi]

it could have been wheel misalignment.
the chain tension was fine sunday morning, so it must have stretched a fair bit.
the chain is a regina o ring. it cost $180
the front sprocket is a factory yamaha YZ125. and the rear is a jtc gasgas...

as for the rear chain guide, the bike has never had one. it was as it is now when i got the bike, guideless.

[gasmonkey]

Well Noobs,youve answered your own question in your last sentance.Go buy one.

[Keithf]

might take a moment to load

http://www.dirtvideo.co.nz/oops.mp



put the vid up of you before it did it

g

[jt119]

might take a moment to load

http://www.dirtvideo.co.nz/oops.mp




glol you guys have a shit load of fun up ther

[Taz]

Fit a guide before you break your cases fool........

[Zuki lover]

So? how far did the bike throw the chain? was it a good throw or not? sounds abit like a spoilt child throwing the toys out of its cot. But guess you won't come back with a sensible answer................. :rofl: :rofl: :laugh: :killingme

[Zuki lover]

Fit a guide before you break your cases fool........

You tell em. Prevention is half of the cure - just like condoms ha ha ha:yawn:

[barty5]

So? how far did the bike throw the chain? was it a good throw or not? sounds abit like a spoilt child throwing the toys out of its cot. But guess you won't come back with a sensible answer................. :rofl: :rofl: :laugh: :killingme

Roadies.. on yah:scooter::wavey::wavey:

[theblacksmith]

I arrived at the trail blazer on Sunday - went to pay -took bike off trailer and went to open fuel tap - HELLO _ only 7 teeth on my front sprocket (Out of 14)? 5 mins of swearing. I then tightened the chain and went on the middle trail - followed by flyingCR250. Amazingly i made it around, then I got really cocky and did the long trail and then came back and did 2 middle and 2 shorts. I felt the chain jump a tooth twice throughout the day. At least i got my 40 bucksworth.Utterly amazed that I could carry on though.
Get a chain guide noobi - end of chain throwing rigmarol.

[barty5]

I arrived at the trail blazer on Sunday - went to pay -took bike off trailer and went to open fuel tap - HELLO _ only 7 teeth on my front sprocket (Out of 14)? 5 mins of swearing. I then tightened the chain and went on the middle trail - followed by flyingCR250. Amazingly i made it around, then I got really cocky and did the long trail and then came back and did 2 middle and 2 shorts. I felt the chain jump a tooth twice throughout the day. At least i got my 40 bucksworth.Utterly amazed that I could carry on though.
Get a chain guide noobi - end of chain throwing rigmarol.

Your day sounds like mine at kuratua a few months back when i got back to car park only had 3 on the rear left still seamed to go alright though lol..

[noobi]

So? how far did the bike throw the chain? was it a good throw or not? sounds abit like a spoilt child throwing the toys out of its cot. But guess you won't come back with a sensible answer................. :rofl: :rofl: :laugh: :killingme

not far enough it would seem, as your still here to be useless

:Pokey:

ill probably just make a chain guide, and use 2 universal rollers instead of a moulded slider piece.

[Rupe]

not far enough it would seem, as your still here to be useless

:Pokey:

ill probably just make a chain guide, and use 2 universal rollers instead of a moulded slider piece.

Sounds good, take some pics.

[tommorth]

not far enough it would seem, as your still here to be useless

:Pokey:

ill probably just make a chain guide, and use 2 universal rollers instead of a moulded slider piece.

a set up similar to a mtb chain tensioner works well had similar setup on an xr once rollers tend last for ever and the chain will rearly if ever need adjusting wont stop sticks getting between chain and sprocket though

[noobi]

can someone with a CR 125 or 250 please measure the distance between the 2 bolt holes that hold the chain slider on

thanks

[B0000M]

you're lucky im bored! and its 3 bolts. the 2 front ones are long and go right through with a nut on the back side, the rear one simply threads in to the lug on the swingarm

[noobi]

you're lucky im bored! and its 3 bolts. the 2 front ones are long and go right through with a nut on the back side, the rear one simply threads in to the lug on the swingarm

thanks :2thumbsup

gasgas have few random parts which come straight off of CRs. fork guards, air filters, brakes, engines so i thought maybe the slider might go straight on. theres an aftermarket one on tm, which only has 2 mount holes. but its not for an 06'

[krad_nz]

Wait wait wait... so your bike has the heart of a Honda?!! :clap:

[B0000M]

sorry i dont have anything older around to have a look at. they should be the same from 03-07 , but LVN CR250 has the previous generation - he's just signed up. he might be able to help you out

[LVN_CR250]

Il go and measure it when it stops raining

* had a look, 99% sure my 2000 model one is the same as boooms

[noobi]

cheese measured that it was 33mm from the two front mounting holes.... which matches on my bike perfectly....

[oldskool]

I might have a chain guard on the KX125 '97 roller that might adapt?

[oldskool]

This any use? The other pix are for Krads benefit should he spot them!

[krad_nz]

Heheh. You always were subtle.

[noobi]

well the CR slider nearly went straight on. only needed some minor modification.......angle grinding.

not sure how long it will last though...
but if it wears through, like what appears to have happened to the one the bike did have judging by the remains, ill make one using rollers like i wanted too

honda part count up to: air filter, fork guards, piston + ring, chain slider, front and rear brake pads, probably the brake assemblies....

[B0000M]

honda part count up to: air filter, fork guards, piston + ring, chain slider, front and rear brake pads, probably the brake assemblies....

might as well just do the upgrade to a honda! :2thumbsup

[vazza]

might as well just do the upgrade to a honda! :2thumbsup

Thats what I was thinking, scarp the gg dale, buy my orange wonder!

[IIIRII]

ill make one using rollers like i wanted too

Who will ?

[IIIRII]

dam doouubbllee ppoosstt