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I know it's a pain in the butt, but you could pull a plug and see if its wet and while it's out check for spark. Lastly if you have one check your compression, I highly doubt tht is the issue. How old is the fuel?

Also what is normal compression for you guys. I'm getting 40-70 with oil in the cylinders. Seriously a sad day here with snow coming in 2 months.

What would be the equivalent piston with just 1 head gasket.

Just curious what psi can be ran with a 10:1 running e85? Local area has it all over in case if I want to have a field day.

I'm going to stay boosted with 91-93 octane since that is readily available. I believe I have a tune that I can choose to run e85, however that requires screwing around even more. So essentially you are saying if my cylinder walls are screwed up it is cheaper just to get a whole new top end.

I confuse myself on compression. With lower compression pistons can't you fit more air/ gas mixture in there meaning more power at same amount of octane?

So after rebuilding my sled after 3 years of it breaking (see my long list of threads on here if you want a good story) I found out that I may need new pistons. In a previous post I mentioned I did a compression test which came back 30, 30, 120, 30. Then used a bore scope to check if the valves...

Can't recall what is normal for boosted sleds again.

I was also thinking this. Anyone near you have a 180 kit?

Let us know how the fuel pressure looks. Got a video of what it is doing by chance?

You forgot the getting mad at it and swearing at it. Careful doing it while it is up on stands in case it tips over off of the stands.

This is WOT right? I'm presuming the injectors can handle it and i would guess if it was the fuel pump it wouldn't right right ever right?

lots of parted out sleds in the F/S section!

90% of the exhaust on the apexes are under the tunnel. you have your expansion pipes under the gas tank, y pipes under the tunnel and then it comes back up at the end of the tunnel. 9 times out of 10 it is hard to get to the pipes above the track so I recommend just taking out the suspension, 4...

Doesn't look too bad. My guess it would be normal since sometimes Yamaha's reverse doesn't lock in 100% of the time and it grinds.

It's been a long journey. The sled hasn't run in 3 years. Last time it ran I had a quarter size hole in the exhaust before the turbo. I'm assuming I ran way too rich, the. I proceeded to shut the sled off and let it sit for a long time. Attached is a pic of one of the intake valves. It's pretty...

Did a compression test on the apex and got 30psi on cylinder 1, 2, and , 4 and 120psi on cylinder 3. This to me seems like an intake/ exhaust valve problem. I assume I just have to pull the head off and soak it with some carb cleaner and put it back together. Anything I should know before...

It is possible trying to start the sled so many times has worn down the rings a bit since there would be a lack of oil. I did put some 2 smoke oil down there just to lube things up a bit. Haven't done the compression test with oil though. Just going to pull the cam cover off and see if those...

New battery, just a little drained from trying to start. Charges up and winds much faster. Compression test is telling my stuck valves. 3 cylinders at 30 and 1 at 120? No way it's rings in 3 and not 4.

Looks like I'm out for the year again...time to drain the tank...again.