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 Topic: MC21 Rebuild in memory of my brother 







fasteddy

 
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fasteddy » Mon May 23, 2016 5:38 am

Home at last and it didn’t take long to strip the fairings, tank and ducktail. I then began on removing the exhausts and carbies along with any other accessories to facilitate the removal of the engine. Surprisingly this all went very smoothly and it wasn’t long before the engine was sitting on my work bench.

For now, I left the bike and concentrated on stripping down the engine to assess the condition of the cylinders, crank, clutch and gearbox. I am currently in discussions with Andy about having the crank rebuilt along with their signature SP tune on the engine. To make the most of this, I’m looking at finishing the engine with a list of tyga parts my brother had noted in his wish list.
Always open to hearing people’s thoughts and ideas, they are always greatly appreciated.
So first thing last, remove cylinder heads and barrels. Everything came apart well considering how rusty some of the studs were.
Rear cylinder, the barrel appears to be in good condition with hone marks still looking clean, the piston does have some score marks which thank god weren’t replicated on the cylinder, the pistons and rings will all be replaced. The cylinder head I think may be a write off due to extensive corrosion (when the bike was stored it didn’t have its cooling system drained). Is this head salvageable?





The front cylinder is much the same as the rear cylinder and appeared to be in good condition again with clean hone marks although not as good as the rear cylinder. The head was also a write off which doesn’t bother me as I already have another rear head to go on the front cylinder.





Once I had removed the cylinders and pistons I moved on to remove the clutch and gearbox. Being that the engine has less than 13000km I was expecting everything to be in pretty good condition but when I pulled the clutch plates out I was a little surprised to see both the basket and hub looked pretty flogged out. Is this normal wear for a dry clutch with less than 13000km?
And next but more importantly where am I able to source the hub and basket?


With the clutch removed, I then pulled out the gearbox. Finally nice to open a part of the engine and find everything in pristine condition, even the gearbox bearings feel like new ones. Would it be ok to re use the gearbox bearings? The oil that was drained was close to pristine, I know my brother replaced gearbox oil every 4000km or after every race day.
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