Rebuilding motorcycle after timing chain skip 62K Km

Claudiu said:
Tensioner blade plastic slide disconnected. I am chasing a rattle on hot start since four years. Will see if this was the cause when I will start the engine.
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Is the bike living in your car? I sure hope you remember how it all came apart...😁
 
Claudiu said:
For info the manufacturing orientation of the circlips securing gudgeon pins. It should be possible to slide in the gudgeons through the bottom scallops of the barrels. I am not sure how to fit the circlips though, it will be a narrow space and fingers are not pliers. Thimbles, custom made tools, any creative ideas? Pictures show the old pistons at 62K kms after pulling the barrels.
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You roll circlips in one spiral at a time, always had piston in my hand or on table when installing circlips.
 
3-D said:
Is the bike living in your car? I sure hope you remember how it all came apart...😁
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It moved into the garage, cupboards and boxes :). I built myself worksheets and instructions:). With pictures and hand notes. But the most annoying is that the bolts and nuts are together…
 
Gerald said:
You roll circlips in one spiral at a time, always had piston in my hand or on table when installing circlips.
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In this version of events I left the conrods on the crankshaft to avoid splitting the crankcase. I can install one circlip and the piston rings on the table, then the pistons go into the barrel and I lower the barrel to fit the gudgeon pins and the second circlip for each piston. I need three hands, a thin tentacle and a makeshift overhead crane… or more tentacles:)🐙
 
New pistons fitted with new piston rings are now into the new cylinder block. "Somebody", including me, machinist who reamed the seat or whoever, scratched the cylinder head. The marks are comparable with the marks left by the MLS gasket, no lips visible. Now thinking if I need to dress the head or not. DIY options considered including sliding it on a granite table with sandpaper glued on it (800->1200->2500) - that means full dressing under head's own weight. Or local dressing with sandpaper glued on glass plate - that means finger pressure calibration. Has anybody seen this before to judge? No profile meter available, visual inspection misleading. I have layout dye. I won't dismantle the head again. No copper spray on MLS gaskets.
 

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Claudiu said:
New pistons fitted with new piston rings are now into the new cylinder block. "Somebody", including me, machinist who reamed the seat or whoever, scratched the cylinder head. The marks are comparable with the marks left by the MLS gasket, no lips visible. Now thinking if I need to dress the head or not. DIY options considered including sliding it on a granite table with sandpaper glued on it (800->1200->2500) - that means full dressing under head's own weight. Or local dressing with sandpaper glued on glass plate - that means finger pressure calibration. Has anybody seen this before to judge? No profile meter available, visual inspection misleading. I have layout dye. I won't dismantle the head again. No copper spray on MLS gaskets.
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When I rebuilt the Roadster with Lush upgrade a friend who works on cars did the sandpaper on granite you described and I've seen it in other videos. Worked just fine for me. If you're asking if the local dressing would be OK, I honestly can't say. My opinion would lean toward the first method to ensure a more flat even result.
 
Claudiu said:
New pistons fitted with new piston rings are now into the new cylinder block. "Somebody", including me, machinist who reamed the seat or whoever, scratched the cylinder head. The marks are comparable with the marks left by the MLS gasket, no lips visible. Now thinking if I need to dress the head or not. DIY options considered including sliding it on a granite table with sandpaper glued on it (800->1200->2500) - that means full dressing under head's own weight. Or local dressing with sandpaper glued on glass plate - that means finger pressure calibration. Has anybody seen this before to judge? No profile meter available, visual inspection misleading. I have layout dye. I won't dismantle the head again. No copper spray on MLS gaskets.
Click to expand...
This far into it I wouldn't try patch work, take it to a machine shop and have milled. Lot of time and money wasted on taking a maybe chance if doesn't seal.
 

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