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Old 11-12-2007, 03:18 PM   #1
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Default Ninja 21 on-road engine - Maintenance for long life?

I know some people have had some issues running these engines - spending money hand over fist just to keep them running and have it break again and again. I know this engine has fantastic compression, but I also know people that run it with the two original break-in shims in place.

How often do you change the bearings - what other good maintenance can be done? Especially to protect the conrod etc...?
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Old 11-13-2007, 11:04 PM   #2
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I would suggest to use high quality after run oil like : JP, Novarossi, Mugen Seiki, they all clear type oil. Don't forget to clean engine internal with electric motor spray, cotton buds, brush teeth, clean clothes and metal polish, to clean the engine's internal & external after use.

Give couple of drops to : rear ball bearing, conrod to crankshaft joints, conrod to piston joints, piston sleeve, carburator opening.

I would also suggest to increase the shim thickness ( another 0.3mm perhaps ? ) to reduce the compression during break in period. This way the conrod has less intense pressure, and hopefully longer lasting.

Nice choice bro.
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Old 11-14-2007, 03:03 AM   #3
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Originally Posted by bozla View Post
I know some people have had some issues running these engines - spending money hand over fist just to keep them running and have it break again and again. I know this engine has fantastic compression, but I also know people that run it with the two original break-in shims in place.

How often do you change the bearings - what other good maintenance can be done? Especially to protect the conrod etc...?
Conrod - I change it after first 5L and then every 8L.
Bearing - I change it when I rebuild the engine (piston/ Liner/ conrod)
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Old 11-15-2007, 01:08 PM   #4
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Can you get a good supply of reasonbly cheap bearings online?
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Old 11-15-2007, 10:29 PM   #5
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Can you get a good supply of reasonbly cheap bearings online?
http://www.tkocompetitiondev.com
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