Phil67
Well-Known Member
- Joined
- Nov 6, 2012
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- 1,254
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Ok, had my cases bored, got all new parts and reassembled the engine. Had the head ported and chamber polished etc, port matched the manifold all good to go. Got a new shift drum and forks cause the ones that came out had a fair bit of wear. Engine went together really easy, they really are simple. Whilst I had the cases apart I cleaned up all the oil returns in the cases which had heaps of burs, one was even fully closed with casting, one of the ones next to the crank bearing. I de burred all the oil areas on the head as well, was gonna paint the internals aka the old boat race engines but thought that was wayyyy overboard. So engine is back in let's fire it up. First kick, this has some serious compression, can barely move the kick starter. Second kick it backfired and almost broke my leg. Third kick it fires, nice. It needs a decomp for sure, you just can't kick it, too much comp. so with the kickback I will have to do the flywheel mod to retard it a litte, should give more bottom end grunt as well, I doubt losing a bit of top end will matter with 201cc. Now the best thing, went to put it in gear and it got jammed, awesome, cases are split again now to Suss out what shimming it needs.
So if your thinking of going 67mm, do it, but MUST have decomp, either cam, button or lever. I will get the lever I reckon. Oh also leave out the base gasket, the piston is wayyyyy down the bore, doing this gives you heaps more bang too.
So if your thinking of going 67mm, do it, but MUST have decomp, either cam, button or lever. I will get the lever I reckon. Oh also leave out the base gasket, the piston is wayyyyy down the bore, doing this gives you heaps more bang too.