Author Topic: Hidden Bling  (Read 977 times)

Offline Scout63

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Hidden Bling
« on: February 16, 2023, 09:31:45 PM »
I finally took the gearbox off in my v7 Sport build and found this lightened flywheel and ring gear.  Also a drilled oil pump gear.  Fancy.  What I don’t understand is why someone tacked the clutch pushrod end cap to the pressure plate.







a
Ben Zehnder - Orleans, MA USA

Online Dirk_S

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Re: Hidden Bling
« Reply #1 on: February 16, 2023, 09:37:43 PM »
Track bike in its previous life?
Current: '18 Guzzi V7 III Rough, '17 Guzzi V9 Bobber, ‘78 BMW R80/7, 1986 Sputnik sidecar

Previous: '16 Guzzi V7 II Stone, ‘15 Ural Gear Up, '11 Suzuki TU250X, ‘86 Guzzi V65 Lario, '78/‘80 Honda CX500, '77 Kawasaki KZ400 Special

Online Huzo

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Re: Hidden Bling
« Reply #2 on: February 17, 2023, 02:09:07 AM »
Why would you drill holes in the gear ?

Offline Scout63

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Re: Hidden Bling
« Reply #3 on: February 17, 2023, 06:54:37 AM »
Why would you drill holes in the gear ?

My question also Huzo. Maybe a PO bought and installed it when doing the flywheel.
Ben Zehnder - Orleans, MA USA

Offline cliffrod

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Re: Hidden Bling
« Reply #4 on: February 17, 2023, 06:59:29 AM »
Can do vs should do stuff.  Drilling everything to excess like that isn’t uncommon in older race/performance builds. When it was all analog seat of the pants dyno, perceived benefits couldn’t always be separated from reality. 






The difference between flywheel effect on my stock flywheel V7 Sport and this CX100 with seriously lightened flywheel is really noticeable- feels more like I’m riding/downshifting a Ducati when I’m on the CX100.  It’s not how I’m used to a Guzzi feeling. 

The welded-in pushrod cap is possibly a remedy to hasty transmission r&r activity like you may do when racing. If you don’t seat it properly during assembly and it then seats itself while you’re riding, you get so much free play that you suddenly have no clutch.   This scenario can also happen at home when you were usually drunk & working on your bike in a hurry….
« Last Edit: February 17, 2023, 07:06:09 AM by cliffrod »
1973 V7 Sport  "Now THAT'S a motorcycle!"-  Master Sculptor Giuliano Cecchinelli
1967 V700 Corsa Record
1981 Lemans CX100
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Online bmc5733946

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Re: Hidden Bling
« Reply #5 on: February 17, 2023, 10:42:07 AM »
I would bet that the few holes in the ring gear are final rotating balance requirements. I would make certain they returned to the same spot on the assembly. I have seen this before, but the memories are distant. Make your own insurance of balance or trust what others have done?

Brian
1989 MILLE GT 
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2004 BREVA 750     
1975 CONVERT

Offline Scout63

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Re: Hidden Bling
« Reply #6 on: February 17, 2023, 07:27:41 PM »
Like an idiot, I didn’t mark the flywheel and ring gear before removing.  I’ve looked for match marks but can’t find any.  I’ll set up the flywheel with a degree wheel and try to get the ring gear right.  Thanks for the feedback everyone.
Ben Zehnder - Orleans, MA USA

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