October 22nd, 2021, 10:27 PM | #1 |
ninjette.org member
Name: Van
Location: NE Ohio
Join Date: Oct 2021 Motorcycle(s): 2007 Kawasaki 250 Posts: 30
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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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October 23rd, 2021, 06:04 AM | #2 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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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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October 23rd, 2021, 08:09 AM | #3 |
ninjette.org member
Name: Van
Location: NE Ohio
Join Date: Oct 2021 Motorcycle(s): 2007 Kawasaki 250 Posts: 30
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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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October 23rd, 2021, 03:19 PM | #4 |
Retired motorcycle Mc.
Name: Robert
Location: Weed, California.
Join Date: Jul 2021 Motorcycle(s): 2012 Kawasaki Ninja 250R, 2021 CSC TT250, 1977 Triumph Bonneville 750cc,2001 Honda XR650L. Posts: A lot.
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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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October 25th, 2021, 08:16 PM | #5 | |
ninjette.org member
Name: Van
Location: NE Ohio
Join Date: Oct 2021 Motorcycle(s): 2007 Kawasaki 250 Posts: 30
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Quote:
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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October 25th, 2021, 10:50 PM | #6 | |
Retired motorcycle Mc.
Name: Robert
Location: Weed, California.
Join Date: Jul 2021 Motorcycle(s): 2012 Kawasaki Ninja 250R, 2021 CSC TT250, 1977 Triumph Bonneville 750cc,2001 Honda XR650L. Posts: A lot.
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Quote:
...if ya want to do something...pull the carbs and clean them ! LOL.... Bob........
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Its too late when you've gone too far ! |
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October 25th, 2021, 11:59 PM | #7 | |
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Quote:
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October 26th, 2021, 05:37 AM | #8 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
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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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October 26th, 2021, 08:38 AM | #9 |
Retired motorcycle Mc.
Name: Robert
Location: Weed, California.
Join Date: Jul 2021 Motorcycle(s): 2012 Kawasaki Ninja 250R, 2021 CSC TT250, 1977 Triumph Bonneville 750cc,2001 Honda XR650L. Posts: A lot.
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EXACTLY ! well said !
Bob.....
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Its too late when you've gone too far ! |
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October 26th, 2021, 08:39 AM | #10 |
Retired motorcycle Mc.
Name: Robert
Location: Weed, California.
Join Date: Jul 2021 Motorcycle(s): 2012 Kawasaki Ninja 250R, 2021 CSC TT250, 1977 Triumph Bonneville 750cc,2001 Honda XR650L. Posts: A lot.
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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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Its too late when you've gone too far ! |
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