This Yamaha 200cc air cooled motor had mechanical noise from cylinder head. So, we checked and found the reason, here.
This motor made 19000 mile by street ride. It may happen but we never saw this part worn out like this. It is dented.
Not sure what the cause but probably multiple reasons. What we can do to avoid this trouble is just keep motor oil maintenance and valve clearance adjusted. We'd recommend oil change every 3000 miles or less (for street use).
Air cooled motor temperature will not be as stable as water cooled motor. That means little harder for oil. So, choose better grade oil for your motor.
We replaced valve adjust screw and adjusted clearance Intake and Exhaust side again. Good to go without noise!
Furuhashi Racing would maintain your street bike specializing in metric here in Indianapolis, IN. Let us know if you have any questions.
Have a nice ride!
My tw200 also has 19000 miles. My Intake valve bent breaking the guide my valve screw has the same damage so Im looking for a new head for rebuild Ive went with a wiseco piston and camshafts camshaft planing on buying your exhaust valve still no Idea what caused my demise you are great insperation for what this bike can do.
ReplyDeleteThank you for comment Codyy and sorry for this late reply. It's everything possible if motor made these many miles, cam chain stretch, cam chain tensioner defect, every gear worn, or bearings etc.. valve timing precision loosing by those factors. We hope you will motor back together and ride again!
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