October 31, 200619 yr Hi, Searching for a work shop in the UK who offers the same knowlegde and machining as B&J Racing US. Need to optimise my squish band and port the cylinder. Im even interested of data for correct squish and head cc, so I can send it to a work shop closer to home. About porting, guess only encreasing width gives benefits. My TY250R-84 set up Engine Boyesen #663 Sammy pipe Tot rebuilt engine Pilot 44(have tested 35 and 40, but RON105 dont cover the pinging)The marks on ign.plate/crank case matches. Main 122.5(mikuni) Extended clutch lever Twin air, same as TYZ Single grade W30 Synt 2-s, 1.4% Chassie Extended shock(no leaking) and encreased pre-load set up GasGas-04 front wheel Stainless for rear brake (instead of the stupid wire) Chain wheels from B&C Lovely Michelin Thinking of: Engine Dismantle the fly wheel weight, running with clutch all the time any way Rebore and port cyl Machining squish Wiseco for IT Mikuni VM28 Alloy repackable middle- and end silencer Maybe an TYZ-like pipe Alloy kick start Chassie New front end springs, fresh stock Nm/mm Lower the foot pegs 25mm and modern wide New rear wheel, unbelivable the hub has been welded before I bought it, could coop with a used stock hub A smaller tank unit Maybe lower the air box Mini clutch lever Edited October 31, 200619 yr by Pat
October 31, 200619 yr Hi Pat, The exhaust port needs raising quite a lot and widening a touch, I have the required dims somewhere which I'll try and dig out, the later pistons also have shaped crowns. I think I took about about 10mm off the flywheel, again I'd have to check. The inlet tract/manifold was shortened by apprx 12mm which then moves the carb and airbox down and forward, this makes BIG difference especially bottom end. Finally I advanced the ignition 3-4mm. You end up with a quieter, smoother and more poky motor which is far usable in sections. There was a brand new ally kickstart on ebay this week . I'll try and find all the Dims and PM you with them
November 1, 200619 yr Author Hughesy, Interesting reading, thanks for great info! Allright, so they adapted the piston for the head about -88? Do you think I
November 6, 200619 yr If you fancy reading French I have an article on how Burgat and Schreiber modified their bikes which I could scan.
November 7, 200619 yr Author My..french Please scan if you got the time. Hope my woman could translate.. Thanks Edited November 7, 200619 yr by Pat
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