Kevin
New Member
1985 FZ 750/87 FZR1000 FR/RR suspension
Posts: 49
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Post by Kevin on Oct 3, 2010 20:25:08 GMT
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Post by tomster on Oct 3, 2010 20:58:40 GMT
Please see my reply to your other post
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Post by Graham on Oct 8, 2010 15:50:31 GMT
Kevin I was thinking I have seen something similar on at least one of my linkages but couldn't be sure. Having looked a the two I have to hand, one on my bike & one I have kicking about they are both showing signs of cracks! I was hoping it was just an imperfection in the casting but having cleaned one up so I can see it properly, it's definitely a crack. The one on my bike isn't nearly as bad but still has a feint line showing on one side. What's a man to do???
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Kevin
New Member
1985 FZ 750/87 FZR1000 FR/RR suspension
Posts: 49
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Post by Kevin on Oct 14, 2010 22:54:20 GMT
Just what I didn't want to hear! I hope everyone here takes the time to look so we can get an accurate idea of what is going on with the relay arms. Has anyone ever heard of a failure? This is getting a bit weird, wouldn't you say? I'm going to take a pencil grinder and see how deep the crack goes then decide if its worth getting it (them) welded up. Keep you posted.
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Post by fz750horse on Oct 15, 2010 13:10:49 GMT
I haven't noticed this on any of mine but from previous experience with engine mountings etc. I'd guess that it's caused by poor maintenance. I'd guess that the alloy around the steel bushing has corroded, expanded and being unable to compress the bushing, has cracked?
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Post by tomster on Oct 15, 2010 16:34:33 GMT
If it corroded internally, the bush would become loose and the arm would then wear inside, I wouldn't have thought it would necessarily crack but without getting one into my hands and looking at the stress lines, it's difficult to ungderstand why the parts are failing
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Post by fz750horse on Oct 15, 2010 17:53:55 GMT
I have chucked a couple of these linkages away because of the corrosion effect I mentioned - what happens is that the alloy corrodes to a white powder which has a larger volume than the uncorroded alloy and nips the bush up tight. I've never seen it on the bushes that the dog bones connect to but I've had the universal joint type bearing that the shock attaches to seized in there so tight I've destroyed the linkage trying to get it out (these are not available from bearing factors and are an arm and a leg from Yamaha BTW - keep 'em well lubed!). I've also had to drill out the 10mm front mounting bolts from two engines due to the same thing - I first tried welding a bar at 90 degrees to the bolt for torque and had it glowing cherry red but it wouldn't move. It might not be what's causing the cracking but it's certainly a possibility.
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