70deg valve clearances

sico · Apr 3, 2016

Hi guys.

Just checked my clearances on a 2012 FE390 @ 115hrs.
Both intakes are in middle of spec at 0.13mm (0.10 - 0.15 spec).

Exhaust valve on cam chain side is at 0.15mm and exhaust valve on header side is at 0.20!! (0.12 - 0.17 spec).

Should I change the shim on the exhaust at 0.20?
It is out of spec, but I generally thought they tighten up as they go out of spec..

Thanks in advance for any advice!

HusaBELGfs570 · Apr 6, 2016

Both my exhaust where around .19-20 after rebuild now they are. 16+- changed shims.
Had zero issues with my bike over 230hours before I changed shims.

sico · Apr 7, 2016

Good to hear.
I changed the shim, put bike back together and fired it up.
Has yours had piston and rings done yet?

Palle · Apr 7, 2016

Just checked mine at my 2011. Cant imagine its been checked for The Last hundreds of hours. This is my competition bild as well. But all was in Good clearance.

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HusaBELGfs570 · Apr 7, 2016

sico said:
Good to hear.
I changed the shim, put bike back together and fired it up.
Has yours had piston and rings done yet?

At 230hours my piston and cylinder looked like new had them mic,d cylinder still perfect piston was at minimum (99.92mm) new one is 99.95 rings did have some wear on them I bet if I Just changed the rings first piston would easily passed 300 hours but I changed everything

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70deg valve clearances

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