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flyingcbf |
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 flyingcbf Nova Slayer
Joined: 23 Aug 2021 Karma :     
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to v or not to v |
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 to v or not to v World Chat Champion

Joined: 24 Nov 2020 Karma :   
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redeem ouzzer |
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 redeem ouzzer World Chat Champion

Joined: 06 Oct 2015 Karma :  
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Ste |
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 Ste Not Work Safe

Joined: 01 Sep 2002 Karma :    
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stinkwheel |
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 stinkwheel Bovine Proctologist

Joined: 12 Jul 2004 Karma :    
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 Posted: 15:39 - 12 Nov 2024 Post subject: |
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Sounds like an expensive way of fixing a non-problem as well as significantly increasing the rotating mass in your transmission and as a result, strain on your primary drive and transmission componants.
If you're badly notching the basket on a 250, you are almost certainly being ham-fisted with your gearshifts. Bought my VFR with 16k miles on it and the clutch basket was horribly notched. I dressed it up with a file, put another 40k miles on and there's barely any notching. Not sure what the previous owner was up to with it because I hardly take it easy and do clutchless shift a lot. I suspect their rev-matching left a lot to be desired. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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flyingcbf |
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 flyingcbf Nova Slayer
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flyingcbf |
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 flyingcbf Nova Slayer
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flyingcbf |
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 flyingcbf Nova Slayer
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stinkwheel |
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 stinkwheel Bovine Proctologist

Joined: 12 Jul 2004 Karma :    
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flyingcbf |
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 flyingcbf Nova Slayer
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stinkwheel |
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 stinkwheel Bovine Proctologist

Joined: 12 Jul 2004 Karma :    
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 Posted: 12:10 - 14 Nov 2024 Post subject: |
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Baskets notch for two reasons. One is the friction plate tabs impacting the fingers of the basket. This tends to happen more if the power is applied and released abruptly or if the clutch basket and centre are doing very different speeds as the clutch is let out. The other is wear of the tabs against the fingers as the clutch is let in and out with the clutch under load.
You can minimise both by trying to ensure the clutch hub and basket are doing a similar speed as the gear is selected or the clutch is let out. One is rev-matching, like double-declutching a car or dipping the revs appropriately for a clutchless shift. The other is slipping the clutch through the change so the basket (which is attached to the engine) doesn't abruptly accelerate or decelerate relative to the clutch hub (which is attached to the transmission).
At the end of a gearshift, the clutch basket rev speed (a function of engine rev speed) HAS to match the gearbox mainshaft rotation speed. The more difference there is between the two, the more load you put on the clutch basket fingers. The more the clutch slips as it's let out, the more gradually the difference between the two speeds is taken up.
Basically the smoother the gearshift feels, the less load on the basket. If you manage to slip it through the gears almost like it was an automatic so you get a steady, smooth acceleration, you're doing well. If you've ever ridden with a pillion and find you have to modify the gearshifting to stop them repeatedly banging helmets with you when you change gear, that's what you're looking for. If I was putting it into words I'd say I preload the lever slightly then dip the revs and half pull the clutch so it slips into the next gear almost by itself, then gradually let out as I increase revs. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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RhynoCZ |
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 RhynoCZ Super Spammer

Joined: 09 Mar 2012 Karma :     
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 Posted: 19:25 - 17 Nov 2024 Post subject: |
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stinkwheel wrote: | flyingcbf wrote: |
I need to learn the clutchless shifting.  |
Not really, it's probably worse for the clutch. Work on your rev matching. Slip the clutch more. |
This +1
You say it's (2019?) Suzuki V-Strom 250. A fairly low torque engine, with not many miles on the ODO I assume. Unless Suzuki did something horribly wrong, what you (OP) describe is a user error. I worked on 40+ years old motorcycles that still had the original factory fitted clutch basket, without any notching as seen in your photograph.
Also, just a thought, I think aluminium is the material of choice for a clutch basket as steel would be too heavy, turning the basket into a secondary flywheel. Titanium would be the best, I guess.  ____________________ '87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor |
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