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Post by rpr851r on Aug 29, 2016 19:57:17 GMT -5
Hello all, Cleaning my rear hub revealed the cracks you see in the picture on the drive side of the hub. I can't see the cracks in the counter bore for the spokes though. Is this something that is seen routinely in these hubs or am I special and this hub is junk? Thanks, Rich  |
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Post by wayne on Aug 29, 2016 21:30:22 GMT -5
I'm in a bit of local community of old Suzuki owners (the bikes or the owners I hear you ask) from T20's, plenty of waterbottles, RE5's etc. I'm afraid I've not seen this problem before.
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Post by exsmokingbiker on Aug 30, 2016 1:26:50 GMT -5
not sure of your location
OR
if the same
I have a spare gt750 one in uk you would need to get it paint stripped as its gold powder coated or i can strip it for you and aquablast it afterwards
but first need the tech guys to let us kno if its the same
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Post by wayne on Aug 30, 2016 5:26:05 GMT -5
Yes, the RE5 and GT750 rear hubs (all models) are the same part number and the front hub is the same as the GT750 KLMAB models.
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Post by rpr851r on Aug 30, 2016 5:52:08 GMT -5
Thanks for the replies Wayne and the offer exsmokingbiker. I am in the US and will source a hub from here. Its strange that those cracks appear in more than half of the spoke holes on that side of the hub. It must be that I have the alpha rotary producing mega HP.
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Post by rpr851r on Sept 5, 2016 19:42:56 GMT -5
Wayne, I sourced another hub and it has the same cracks or casting flaws as my old hub. What do you make of it?  |
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Post by wayne on Sept 5, 2016 23:12:09 GMT -5
Let me pass that photo around. I'll get back to you with any comments.
Meanwhile, there are a lot of experienced people on this board. Has anyone come across this before ?
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Post by wayne on Sept 6, 2016 5:11:15 GMT -5
Here's a couple of comments back already. The casting mark idea occurred to me but they look like cracks. The M model RE5s often have what look like nasty cracks in the water pump covers but they really are superficial (look horrible though).
I've just gone down and closely inspected the hub on my GT750 using my reading glasses and a bright flashlight. I have about 5 fine cracks but only on one side of my rear hub (sprocket side). They are very hard to see, you would never notice them (as I have not done) unless specifically looking. How about that ! What Steve says below seems to be the case........more common than we know ?? I'll point out my own finding to these guys and see if anyone else can now find them. May be common and perhaps not really a problem (?)
Hi Wayne, Are they cracks or just casting marks ? John
Wayne, I’ve heard of the problem, but haven’t noticed it in any of my GT hubs….my 750 hub looks OK (at a glance).
I believe it’s more common in racing circles, but it may be more common than we realize, possibly a result of overheating from heavy use or a dragging brake show (my two cents worth anyway….) Steve.
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Post by wayne on Sept 6, 2016 5:54:23 GMT -5
Just heard back from John again who's racing goes back to the late '60's and early '70's for Suzuki. He says that other than a T20 that had a hub failure mid race, he's never heard of another Suzuki of that era having a hub fail. He also sold them into the mid '70's so I'd guess he'd have heard. If the cracks are real, it may be common and they may be superficial.
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Post by rpr851r on Sept 6, 2016 20:30:11 GMT -5
Hi all,
Mystery solved. I took a look at the cracks again on both hubs but this time with 10x power. They do seem to be casting flaws and in fact occurred on the same holes to the same degree more or less. I then took 120 grit sand paper on a block of wood and was able to sand them out on the original hub in about a little less than an hours time.
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Post by wayne on Sept 6, 2016 22:01:05 GMT -5
Okay, my hub is polished which probably explains why they were so difficult to see.
We can both sleep well.
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