Super Jet Dome and cylinder pitting

[SJ 701X]

Hey guys I just pulled off my ada head, with less than ten hours on it, and found this. It's in the rear cylinder and on the exhaust side. Any idea what the problem could be? The pick marks are identical and are rectangular. I'm really hoping something in the crank didn't go. Is this still usable? There isn't any scoring on the cylinder wall thank god. Anything helpful I appreciate

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[TheBuzzard]

something went thru your motor. probably a crank bearing cage is coming apart. tear it all apart and find out. sand off the high points , stuff another crank in there and keep beating it. that is if the piston rings arent stuck in the grooves.i usually take a very small ball peen hammer and try and knock most of the aluminum back into the pits before sanding.

 

[SJ 701X]

Anybody else? I don't want to reassemble and have the crank go.

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[4SeasonsPower]

I think the buzzard just summed it up. Tear it down.

 

[SJ 701X]

Shlt alright. Thanks guys. Better to do it once and do it right.

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[b.lee]

Ya tear it down.. at least you caught it somewhat early

 

[SJ 701X]

Engine is sitting on the living room floor. Any other recommendations while it's out
And apart? I may paint it, idk. I may check the ports and what not too, and unfreeze the b pipe bolts.


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[SJ 701X]

Took her apart and didn't find much. Moved the bearings around and it all looked fine. Here's the pictures. I didn't split the cases. Should I just buy wrist pins and roller bearings for the pistons?

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[4SeasonsPower]

You need to split the cases and inspect the main bearings.

 

[hondamxracer]

I would split the cases for sure.

I had a similar issue after 9.4 running hours: http://www.x-h2o.com/threads/134673-Root-Cause-Help-me-diagnose-a-piston-cylinder-failure

 

[SJ 701X]

Well wouldn't you know it. What do y'all recommend for a crank. I'm thinking of hitting up JM for one

https://www.youtube.com/watch?v=AB6GFJ6OnCg&feature=youtube_gdata_player

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[Tyrant1919]

JM, that's where I'd consider going.

 

[SJ 701X]

I remember reading a post where sbt didn't use oem replacement koyo beatings and the sbt beatings had a higher rate of failing. Is this b.s. or am I better getting an oem crank.

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[OCD Solutions]

There has been several threads on that topic over the years. From what I remember, they went thru phases where they used different bearings and failures did increase. I believe they got this straigtened out though because I have only been hearing good things for the past couple years.

 

[SJ 701X]

Alright thanks ocd that's good news. Going to be getting one from Chris asap.

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[SJ 701X]

Well the engine and pipe were bead blasted and painted. Took two days to blast everything and one day to paint it all. She's sitting in the oven curing as we speak.

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