Not yet. Been pretty busy and haven’t had a chance to tear it back down yet. I’ll post an update here for anyone interested once I figure it out.

 

Got it pulled apart today. Definitely had the pushed rods switched and the intake valves are bent. Did a “poor man’s leak down test” and shined a light through the intake runner and could see light around the intake valves. And they had marks on the front of them from contacting the piston. It doesn’t appear they made a lot of contact though. Just a kiss. So I dropped it off with my local dealer. They think they can just replace the valves. We will see.

 

Is this the first engine work done on your bike, any warranty on the bike ?

 

Yup, first engine work in 22k miles. Warranty expired a year ago.

 

Oh by the way, here’s the original head gasket that was leaking.

 

If I wanted to go with a Cometic gasket, which one would I get? I know the stock bore size is 3.937”... but there are two thickness sizes. + 0.030 and + 0.040. What would be the benefit of going thicker?

 

slightly lower compression? edit, you said benefit, I read 'difference' at first..

 

I think the 0.030 would be better for a tighter squish area giving more turbulence and less chance of preignition vs the 0.040. I don't know what the stock thickness is though.

 

Are you doing both heads? If not, you need to stick with a stock gasket to match the head you haven't pulled.

If you have pulled both heads, going with the .040 gaskets probably won't require a different tune. It only increases the compression to 10.1:1. The .030 gaskets will get you to 10.3:1 compression which could be enough to require a different tune. Someone with more tuning experience than I have could really answer this question better than I can. If you were going to install a cam while you were doing the heads, then I would for sure go with the .030 gaskets. The increase in compression and the tighter squish will make a performance difference.

 

Right on. Thanks for the info. I was thinking about it last night and figured I might have issues going with a different head gasket unless I replaced them both. I’m only doing the one head. But knowing my luck I’ll get it all buttoned up and the rear one will fail 500 miles later.