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 Topic: NSR250 MC18 R5K Engine Rebuild 







philup_7@hotmail.com

 
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philup_7@hotmail.com » Tue Mar 10, 2026 2:58 pm

RC Valves Removal
Removed the RC valves while in situ to make like easier (If that ever happens!!).

The Cylinder & Cylinder Head Nuts were slackened off prior to RC Valve removal, you don’t need to do it this way round, just wanted to try out T2Racing special Cylinder Nut Tool to see if it worked without any issues LOL.



Probably didn't need to use the special Cylinder Nut Tool if I took the RC Valves out beforehand, but most probably will need during assembly as it's easier (well I think it is) to assemble the RC Valves whilst the Cylinder is on the Bench (well that's my excuse m'lud).


The RC Valves were sprayed with some KROIL penetrating oil thru the Exhaust Port and left overnight with the hope it would help the extraction process. However, it was still a struggle extracting the RC Valves as the Seals & ‘C’ Clips refused to budge & had to be extracted separately afterwards with my trusty Seal Remover Tool.








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