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  #1 (permalink)  
Old 08-22-2016, 08:23 AM
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Join Date: Jul 2007
Location: Medford, Ma
Bike Year, Make, Engine: 07' Custom Pro Street w/127" El Bruto
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Evo engine tear down beginning

I began the tear down today because of a bent pushrod and encountered a few problems. I'll be posting pics with questions and hopefully some good info as to why/how/what the fuck to do now/etc! I'll post pics when I get home as I'm on my phone now. Hopefully this goes as easily, but we all know how that turns out!
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Old 08-22-2016, 02:17 PM
beerman1378's Avatar
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Here goes it...

- Bike shit the bed on me and after getting it home, I noticed the rear cylinder exhaust pushrod was bent to hell. Couldn't even get it started.

- I have a brand new lower end that was sent to me from Midwest because I had an oil leak from day 1 but didn't feel like pulling the motor at the time. That time has come!

- Got the Ultima 127 out of the bike and started to break it down. Here are the results so far of what I have done



One of the front or rear lifters in the tappet



Another view of the lifters chewed to hell



Here is the bent pushrod (Believe it or not with all 4 lifters torn up, only 1 pushrod was bent)



First shot of the cam (which is also very hard to turn while attached to the nose cone)



2nd shot of the cam



Now this is where all the metal shavings were found! They ONLY seemed to be in the lower left part of the nose cone



This is where the breather gear goes. Is the rear of that seat supposed to look like that?


With all this said, What the hell went wrong? I'll be breaking the rest of it down soon to inspect the valves, cylinders, pistons, everything else pretty much.

Also, I'm lost when it comes to the "lift", "duration", etc. I just need an an answer on that cam and lifters I should be looking at (spec wise)

I appreciate the help in advance!!
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Old 08-22-2016, 07:00 PM
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Bike Year, Make, Engine: 88" ACM Rigid Bobber
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The hardening on the cam or lifter rollers or both was the issue, luckily you have a new bottom end but I'm sure your valve tips aren't real happy after all of that pounding, your doing the right thing by checking everything. John at Scooters can recommend a cam to suit your engine and riding style, I'd be curious to see if anyone else had an issue like this on one of these engines. I had Lunati cam that did that in a race engine years ago, it had a hardening issue and wore out in a few minutes. At least you have a good, clean bottom end ready to go.
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Old 08-23-2016, 04:36 AM
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Offshore manufacturing at its finest
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