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Old October 22nd, 2021, 10:27 PM   #1
Vansaki
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Clutch friction plate thickness

I recently purchased a 2007 Ninja 250r with around 6500 miles on it. The bike is in great shape. I've cleaned the carbs, air box and adjusted some things. I plan on taking the clutch apart when i change the oil. Does anyone know what the friction plate thickness should be ? I probably don't need to do this but I'd rather check it now rather than in the spring when I want to ride and possibly have problems (I live in NE Ohio and our weather will be getting crappy soon). Kinda like a preventative maintenance thing. Also I am 6' and weigh around 212. Would replacing the clutch springs with ones that are a little stiffer be better for me since I'm not a small rider ?

Thanks for any input! Glad to be a part of the Ninja Community !
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Old October 23rd, 2021, 06:04 AM   #2
Triple Jim
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The manual says the service limit for clutch plate thickness is 2.8 mm, and the service limit for spring length is 31.7 mm.

I have a 2005 with 20,000 miles or so and have never had a problem with slipping. Your height and weight don't have anything to do with the clutch's ability to resist slippage.

Welcome to the board Van!
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Old October 23rd, 2021, 08:09 AM   #3
Vansaki
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Thanks Jim!

I'm sure the clutch is fine but the weekend mechanic in me wants to tinker... lol
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Old October 23rd, 2021, 03:19 PM   #4
Bob KellyIII
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Welcome Vansaki in Ohio !
something to do on the Ninja ? I got one for you... Adjust the Idle jet screws
in the carbs PROPERLY....not just a certain number of turns out, adjust them to the fastest idle while the engine is running !
... it's near impossible to get your hand and tool under the carb after you've removed the plugs covering the idle air mixture screws,but if you can figure it out you'll be rewarded with a better running engine and better response off idle.
the engine should be warm/operating temp when you do this....
99% of us just leave the screws set at a certain amount of turns out from their stop which you adjust on the carbs when their off... it works, but it is not optimum. getting that mixture correct at idle really helps the over all performance of the bike !....if you figure out how to accomplish that task please let us know ! LOL
it's not as easy as it sounds...there is no room !!!
.....
Bob........
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Old October 25th, 2021, 08:16 PM   #5
Vansaki
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Quote:
Originally Posted by Triple Jim View Post
The manual says the service limit for clutch plate thickness is 2.8 mm, and the service limit for spring length is 31.7 mm.

I have a 2005 with 20,000 miles or so and have never had a problem with slipping. Your height and weight don't have anything to do with the clutch's ability to resist slippage.

Welcome to the board Van!

I checked my friction plates. They are 3.01 mm . The steel plates look good. Their thickness was 1.95 mm. Now the springs...the biggest was 31.51 and the smallest was 31.40. I see I need to replace the springs. Should I go ahead and replace the springs and the friction plates ? If so, can you recommend a brand?

Thanks Jim !
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Old October 25th, 2021, 10:50 PM   #6
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Quote:
Originally Posted by Vansaki View Post
I checked my friction plates. They are 3.01 mm . The steel plates look good. Their thickness was 1.95 mm. Now the springs...the biggest was 31.51 and the smallest was 31.40. I see I need to replace the springs. Should I go ahead and replace the springs and the friction plates ? If so, can you recommend a brand?

Thanks Jim !
just put it back together , it's fine !
...if ya want to do something...pull the carbs and clean them !
LOL....
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Old October 25th, 2021, 11:59 PM   #7
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Quote:
Originally Posted by Vansaki View Post
I checked my friction plates. They are 3.01 mm . The steel plates look good. Their thickness was 1.95 mm. Now the springs...the biggest was 31.51 and the smallest was 31.40. I see I need to replace the springs. Should I go ahead and replace the springs and the friction plates ? If so, can you recommend a brand?

Thanks Jim !
OEM stuff works fine. Even cheaper eBay or Ali will work. This isn't fire-breathing monster. Unless you're racing and your paycheque depends upon placing in top-3 finishes, I wouldn't worry about brand-name too much. Quality of assembly process makes much bigger difference.
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Old October 26th, 2021, 05:37 AM   #8
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Your worst spring is about 0.3 mm (0.012") shorter than the service limit. Your clutch plates are 0.2mm over the service limit each, so they way more than make up for the slightly short springs. I'd put it back together as-is. If I really felt the need to do something I'd probably shim the springs 1/2 a millimeter.

It's too bad you didn't ride if for a while to see if the clutch slips. If it doesn't, there's no need to mess with it. It doesn't have to be exactly by the book, it just needs to do its job without slipping.
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Old October 26th, 2021, 08:38 AM   #9
Bob KellyIII
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EXACTLY ! well said !
Bob.....
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Old October 26th, 2021, 08:39 AM   #10
Bob KellyIII
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like the spring that is the shortest put a washer under it and go for it

.... Bob
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