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I have a STRONG suspicion I know what bike these Ti intake valves originally come from...
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The reddish hue is from running MMT through the engine, it's nothing more. This stuff, when I know I'm going to push the bike hard:
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Nope. Stripping the head tomorrow in preparation to go bigger and better. Will know more when I pull the valves, I need to see the back side on the valve, where it seats, to see if the DLC is still present.

Knowing where these valves came from will make this a lot easier, and I'm quite confident I know precisely what they came out of and from where. More tomorrow when I get them out and measure stem diameter and overall length.

Not impressed with certain choices in the valvetrain, so time to do it right instead of to a price point.
 
Chambers came out to 76cc and valves are still quite sealed. .1" or 2.5mm, decked off head.
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Curious what tolerance spread there was between the three of them?

My Dad was a master tool & dye maker & designer. He always said: "If ya want it done right - do it yourself."
 
75, 76, 76 but hey human error in measurement can be that 1 easily, and I'm not about to do it 9 times and average each hole lol.

I agree with your dad. It helps to have a guru whispering sweet nothings in my ear lol and my dad to bounce questions off of once in a while.
 
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