08 Honda 420 timing issue?

Carolynskii said:

Retro you know darn well I don’t have any fancy measuring tools like that! Lmao
I did pull the head and did a backyard test by pouring gas over the valves to see if it leaked through and the compression valve poured gas thru it so I gotta lap that one.
I also noticed I had two marks on top my brand new piston which indicates that it’s definately out of timing so I’m gonna put another cam that I have laying around on it and see it that cures it.

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intake valve struck piston, timing is off ?, spacing for cylinder not right, allowing less clearance for piston to rise higher, herby letting valve hit piston ?. my money is on timing or both.

Carolynskii said:

I rebuilt this bike from mud junk that didn’t run. Now it will start but blows out the throttle body. Valves are adjusted tdc on compression stoke ok and cam is set correctly under front cover with a new timing chain.
Is it safe to say the cam is bad?

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from what I know, a bad cam won't let the valve hit the piston, but timing off will, or, a sticking valve. worn cams only mean no compression from what I've learned in my years. the only way a piston will hit the valve is if the valve sticks ?, or, the timing is off ?. worse case, the connecting rod bearing at the bottom is bad ?, or, the top of the connecting rod where the wrist pin is too far worn, and letting slack happen, then you have the piston hitting a valve.

Carolynskii said:

Cam wasn’t very worn but the face with the theeth were off. I replaced the cam readjusted valves because the new cam made em really tight and I lapped that valve. She purrs like a kitten now sounds quiet like a new one.
Thanks for the help y’all I got lucky on this one.

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sooooooooooooooooo..you had the timing off with the cam chain and cam chain sprocket then ?..lol. yep, you got VERY lucky !..lol.