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KZ clutch basket rivets 28 Feb 2024 08:33 #895695

  • asphalt900
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Didn't know that? I know Matchless/Norton and others shared British tech before they went defunct. The Snorting Norton, here's a Commando 750 gearbox i'm finishing up for a 1973 restoration. Sooo different than the Asian bikes! Think i have all the Andover tools and Whitworth tools for just a one-off endeavor i'll ever need again, but ya never know ha.
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KZ clutch basket rivets 28 Feb 2024 15:57 #895721

  • Southpaw
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Well that didn't go as planned, got the rivets welded in but I got hairline cracks, tig welded it with ER80 S. Anyone know the secret to welding these? Hoping Jay might chime in and share his process??
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KZ clutch basket rivets 28 Feb 2024 16:27 #895722

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Welds look burnt.
Probably not enough sheiding gas which has led to excess oxygen causing overheating, over expansion and enbrittlement.
Maybe to many amps too.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





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KZ clutch basket rivets 28 Feb 2024 16:46 #895723

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Tig was set at 25 lpm, furick #10 pyrex cup

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KZ clutch basket rivets 28 Feb 2024 20:16 #895728

  • Nessism
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Welder friend used silicon bronze type welding rod on my 750 basket.  He welded each rivet in segments, working his way around the basket.  

P1020585 by nessism , on Flickr
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KZ clutch basket rivets 29 Feb 2024 10:33 #895754

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Hmm, never thought about Tig Brazing them in........

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KZ clutch basket rivets 29 Feb 2024 10:46 #895756

  • asphalt900
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Who got nutty with the drill bit lightening the basket? That's probably where your hairline cracks came from, no dispersion material to relieve the byproduct of heat when welding. 
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KZ clutch basket rivets 29 Feb 2024 13:41 #895761

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In the Suzuki GS world, drag racers would sometimes scatter clutch assemblies because the backplate would shatter, and/or the basket, although this was much less common.  That clutch assembly full of holes throws a red flag to me, although, admittedly, I'm not a draw racer, and I don't know big KZ's very well.   

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KZ clutch basket rivets 29 Feb 2024 19:19 #895770

  • Vinsky
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I used 304 ss to weld my clutch basket. Sil Brz would be a good choice too.
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KZ clutch basket rivets 01 Mar 2024 08:16 #895783

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I don't think you need to be worried about some tiny cracks, you mentioned your planned engine build was going to yield about 140 HP.

It takes a lot more HP than that to rip apart a KZ clutch hub. I was told stock KZ stuff starts to break at the 400 HP level.

You also need to remember the weld material is now stronger than the material it is bonded with. It would take some crazy power to rip that assembly apart even with the lightening holes.

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KZ clutch basket rivets 05 Mar 2024 09:23 #895999

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That would be me that lightened the clutch assembly, It's not unusual to do that, I doubt it has anything to do with the cracks, 

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KZ clutch basket rivets 06 Mar 2024 06:55 #896034

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I have never heard of a KZ clutch coming apart at the drag strip. The main carnage happens to pistons or drive chains, I have seen some drive chains break and it can cause case damage in front of the drive sprocket.

I got rid of the stock chain guard at the front sprocket, I made a stronger thicker steel guard in case the chain lets go (grey strap) This protects my fuel pump and lines but also the lower case.



The stock trans door cover casting breaks too easy when the chain comes apart. This is on a 650 but you can do the same thing on a 900/1000.
 
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