well here you go guys,   found what demolished the spark plug.  talk about a silent death.  cut out all quiet.  hit the starter button and there was a grinding noise.  hit again and just click,  hence why original thoughts were starter.   other than that grinding noise there was nothing.

surely that valve could not have been bouncing around in there for long ?   those holes were made just by one or 2 strokes ?

.....   more pics in a thread in the sporty section if interested.

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Killerchef
Whats the head look like mate ?

hey hb.  here it is mate.  the 2nd pic i lightened up heaps.  it looks like the valve has just come awy from the stem.

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here are just some other pics i took  .....

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Fella that looks like a re-bore and new heads. Plus what is in the bottom end. Gravity would have sent the broken piston parts to the case. Do the sums and see what is the better option, rebuild both top and bottom ort a swap motor.

Hell better the devil you know.


Mate I feel for you.

Is the piston still attached to the rod or has the pin gone

head will be able to be repaired no worries would pull motor down ya gunna have heaps lil shit in cases me thinks if bore is ok should be able to put new slugs in i think mmm nope got 883 an twincam pistons here think i got set evo heads but they dont got front bracket holes in they been ported an are ready to go ..also got some stainless valves here too mate if ya need anything give me a call or pm
0450511192 cheers ron

 when you do  a 883 to 1200  you must re check the valve too piston clearance  because the 1200 piston has the valve reliefs cuts  in ther piston crown out further than  the 883 head .  e.g. 883 piston 3 inch dia -1200 piston 3,500 inch dia  that is 1/4 inch different each side inlet & exh  the 883 valves are more inboard than a 1200 head , you have too cut new valve pockets in the piston 0.250" inboard for valve too piston clearance , but depends on the brand as well , but buy the pic's looks like  that was not done , + give a little bit extra clearance on the top ring-end gap does not hurt , most 883 too 1200 are not done proper i have found  as comp ratio  set up + on stock cams =  not a long lasting donk,                                                   i have  a couple of sets of 883 heads left over if you need them as i use too race in the 883 twin sport class , the old roaring sporty's  race series          i use too do the heads for quite a few race teams  inc John Allen , robbie Hermens , Lenny Willing  all top aussie  champ riders