what has been done so far?
i determined the combustion chamber volume: 32.5ccm (would give approx a compression ratio of 1:9)
this value was determined after the cylinder heigth was decreased by 0.4mm (ex valves had been set deeper by 2mm to clear valve to valve distance, 0.5 base gasket, 1.3 head gasket).
the camchain is too long at the moment. now i will decrease cylinder heigth by another 0.5mm, dito cylinderhead heigth. this will give 1:10 compr ratio, hoping a reduction of the camchain length will make it fit properly (from what i feel, it will take another 0.5mm heigth reduction, resulting in <1:11). next investigations will come soon.
the cyl head is half done. the pics show the eliminated inlet tubes(?), which will be replaced by bigger ones, suiting better to my 34er flat slide carbs.
the upper crankcase has got a primary chain guide (from cb900f), hoping this will reduce primary chain slack.
mec