Cracked Swing Arm

[Anonymous]

Is it a known fault that WR450 swing arms crack?

I noticed that mine has a hair line crack on the RHS top where the chain slider is.

I will take it off and get it welded, but was wondering if antone else has heard of this happening to WR’s or have I just broken my toy?

[RoyMember]

Can’t say that I have heard of any. Not saying there hasn’t been any though.

[ChrisMember]

Bloody Yamahas better get yourself a KTM.

Chris

[dennis da menaceMember]

its a common yamaha thing Dan,

it cracks in the exact spot where the bikes previous owner used to whack it with a stick once he had finally realised yamahas were shite :laugh: :laugh: :laugh:

see the light Daniel, the big orange light…..

folllllowwww it :laugh: :laugh: :laugh: :laugh:

[Anonymous]

Thanks for the advice Menace and Chris. NOT

I will stick with blue and just get it welded

[GregMember]

Dan are you 100% sure its cracked not a fabrication casting and if so where on the swing arm is the crack?

TB

[dennis da menaceMember]

just stick a blue flame sticker over it :laugh: :laugh: :laugh:

she’ll be right

[TrentMember]

I reckon that’s what caused it to begin with, the bike got pissed off and said “I want a new owner this bike molester ain’t riding me again!”

[Anonymous]

chris72a wrote:

Quote:

Bloody Yamahas better get yourself a KTM.

Chris

Hahaha, listen to him!!

Wouldn’t have happened on a 2 stroke though

I can’t say I’ve ever heard anyone complain about a broken swingarm on here, on any bike for that matter.

At least it’s in a position where it can be easily welded.

[Bruce CurtisMember]

This is not a common fault on any modern bike Dan, like TB said casting mark or fault maybe?

BC

[alanMember]

must be riding it to hard dan :laugh:

[Eric SmithMember]

Never heard of that one Dan. Closest I have come is seeing a Gas Gas lose all the rear sprocket bolts and chew a 1-inch tear right through the swingarm as it rotated and quickly destroyed itself!

As TB said, are you positive it is actually a crack? Seems like a weird place to let go – not the most stressed point of the part.

[Anonymous]

I pulled the swing arm out this arvo and it definately has cracked. Not a big open gaping crack, just a small hair line, not even wide enough to get a stanley knife blade in. I think some of the problem has been the chain slider has been rubbing on the swing arm which has eroded a bit of the swing arm and the crack has appeared.

Tony came around this arvo and took the swing arm with him to weld it up. I dont think that the crack would of ever been a problem and it could of been there for ages???? for all I know.

I think with a bit of weld on it, it will be right, I hope :huh:

I did find that I had a seized bearing in the bottom link bearing which I have since re-greased and put back together.

[Bruce CurtisMember]

I wouldn’t worry if it’s a longitudinal crack Dan, sounds like an internal casting flaw has surfaced with a little wear.

a good vee groove with a grinder and a competent TIG operator and like new again.

BC

[Anonymous]

Are you gonna weld it cold? it might be ok, but I’d be doing a bit of investigating first…. you don’t want to make it brittle.

[Author]

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