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PostPosted: Fri Mar 31, 2017 4:14 pm 

Joined: Sun Sep 01, 2013 10:52 pm
Posts: 1223
Location: South Dakota
I finished the S1C today and fired it up. It ran great for about 5 minutes and when I shut it off as the engine was spinning down I heard what sounded like a circlip going through a cylinder. It sounded like the left cylinder so I pulled the head and there was a few impact marks on the top of the piston. I tried to pull the jug but it would hang up on the rings. I pulled one circlip(they were both in place)and the piston pin and then I saw the bottom ring was shattered in about 10 pieces. I don't know how but the cylinder is unscarred and the piston has a few burrs near the top so it should be okay. I ordered a new ring set but I considered checking the old rings to see if one was in spec so I wouldn't have to wait but I don't like the thought of having a used piece in one of my builds. I'm going to make sure the ports are chamfered acceptably before it goes back together. The cylinders were in spec so they got honed and new pistons and rings installed when the engine was assembled so the old rings would probably work. By the way it was $70 for a single ring set. :( Also, did the ring pieces all go out the exhaust or are they in the bottom end?

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1969 H1, 1971 G3SSA, 1974 G5, 1973 H2A, 1975 S3A, 1975 H1F, 1973 Z1, 1988 HD FLTC, Captain America chopper, 2000 Excelsior Henderson, 1965 Bridgestone BS90


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PostPosted: Fri Mar 31, 2017 7:44 pm 
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Joined: Mon Jun 13, 2011 7:14 pm
Posts: 936
Location: Martinsburg, WV
The problem with ring pieces in the engine is you pretty much can't guarantee you got them all out leaving the engine in place. I learned the hard way on an old DT1. I'd pull the engine, wash out the crank area of that bore, flip it upside down, spray air in there to make sure it's clean, make sure the crank spins freely, then load it back in and try again. :thumbup: You'll probably find most of it in the exhaust pipe. Check the exhaust port at the top. That's usually where they like to grab the piston. Check the piston and make sure the arrow is pointing to the exhaust.

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74 H2B with reeds and 34mm carbs
75 S3A Ram Air with reeds and 30mm carbs
73 S2A (wife's bike)
71 Yammi RT1B
83 HD Sportster
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06 Kaw 750 Vulcan (wife’s bike)
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PostPosted: Fri Mar 31, 2017 8:46 pm 

Joined: Sun Sep 01, 2013 10:52 pm
Posts: 1223
Location: South Dakota
Yup, I was talking to Dave earlier and he agrees, send the crank back to Charlie for a real inspection. I already have the engine out and apart on the bench. The lucky thing is that Charlie prepared two cranks for me because I am restoring a KH250 after this one so I have a new crank handy to throw in. I also have the complete top end of the KH250 to use for parts for now so hopefully it should be running again by tomorrow evening. :)

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1969 H1, 1971 G3SSA, 1974 G5, 1973 H2A, 1975 S3A, 1975 H1F, 1973 Z1, 1988 HD FLTC, Captain America chopper, 2000 Excelsior Henderson, 1965 Bridgestone BS90


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