Evo won't turn
Thread Starter
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Cruiser
Joined: May 2009
Posts: 111
Likes: 0
From: kent, OH
And BINGO was his nameo....exactly what it was. Good catch Dan, I did find the third one in the filter housing. Come to think about it I did just pull the carb off after unbolting the filter housing..should have rang a bell there but had things on my mind. Well a costly mistake on my part but only one thing to do now....wonder how much a big bore kit is.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Phew! Well done with your detective work. And commiserations. I looked into boring out my Evo and gave up as there isn't much spare room for a bigger bore, unlike the twincams. I stroked mine instead.
However these days the better tuners can do wonders with higher CR pistons, cam and ported heads. If you're interested contact HDF sponsor Hillside Cycle. Their website is well worth a look.
However these days the better tuners can do wonders with higher CR pistons, cam and ported heads. If you're interested contact HDF sponsor Hillside Cycle. Their website is well worth a look.
Stellar HDF Member
Joined: Apr 2009
Posts: 3,039
Likes: 11
From: Northern Ontario
I'm really glad for you that the problem stayed on the top end and not into the bottom end. Working on these are like a carpenter doing his work, measure twice cut once where as for us we just go everything twice to make sure there in place and tightened down.
Good call Dan.
Good call Dan.
Thread Starter
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Cruiser
Joined: May 2009
Posts: 111
Likes: 0
From: kent, OH
Okay here are some pics, if I can I would like to make this as painless as possible as I did some looking and it seems the cost of doing much would be too expensive right now. What are opinions on using this piston and head, maybe after some repairs to the damage if possible. I guess I should have the valves cleaned and new guides installed, what about the springs do you think 46000 justifies new ones? With installing new rings should I have the cylinders honed?
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Let's examine this, what appears to be the intake valve has taken a direct hit, so that is probably bent a little bit. The head has a good gouge in it too. This means the piston was on the other side of these impact. Below this the wrist pin bushing probably took a good lick too. I would replace the pistons because you may be looking at a future failure of any of these components. The head may be able to be repaired, but you just might be able to find a used set cheaper. That's what I would reccomend from the pictures if the bike was rolled into my shop. If you ride it and the piston comes apart then you will be spending a lot more to fix it. Hope this helps.
John
John
Thread Starter
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Cruiser
Joined: May 2009
Posts: 111
Likes: 0
From: kent, OH
Actually that is the piston miacycles, the valves seemed to have escaped any damage but I do intend to have them looked at. I will most likely get a new piston and have the damage on the head repaired, the questions I guess I need answered are should I just go ahead and do the valves and guides since it is open already? Do I need the cylinders honed for new rings? and what are the best gaskets for my engine. Then again do I get another new piston if I'm getting one already? Man this sucks, I have taken off and put back on that carb a dozen times and never forgot to tighten the bolts. I feel like an idiot. Thanks for the feed back guys.
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
OKNow I see it's the edge of the piston, it looked like an intake valve and head. New pistons for sure, I would have the glaze broken in the cylinders and new rings. Cometic makes quality gaskets and you can get the head gaskets in .040 for street use. Check the wrist pin bushing too!! Oh and blue loc-tite on the air cleaner bolts this time!!!LOL!!!
John
John
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Ultimate HDF Member
Joined: Aug 2012
Posts: 6,470
Likes: 4
From: on the road
A good friend of mine had a similiar issue happen on his way thru wichita Ks and took the bike to truett and osborne to get rebuilt with their setup.He later decided he didnt need to spend the money for wheels and they had the engine apart.On rod was bent out of tolerance and would of likely destroyed his patch job making him blame them on their work.He then decided to go all the way with the build and happily got a bunch of miles out of it.My thoughts are do it right once not a dozen times------these motors are getting to be a little harder to find in good shape unless you use after market stuff.When you do find one it will bring as much as a s@s thats been rebuilt
I need to add the piston pin bore was cracked and the piston was junk but not visible to the naked eye-------he was running down the road when his issue happened though
I need to add the piston pin bore was cracked and the piston was junk but not visible to the naked eye-------he was running down the road when his issue happened though