zdenekhanz píše:Ahoj,tak ty valce a pisty se nedaji pouzit jelikoz je tam jinej zdvih a to nelze vyresit bez vymeny kliky.Do takhle velky upravy samozrejme nejdu.....me bude stacit to puleni kvuli razeni...tak se nezlob a nabizej dal....diky Zdenek
Tak to te musim zklamat, ale ten clovek co ti tohle rekl, nema pravdu... sice to ma jiny zdvih, ale na upravu na 800ccm to funguje

, das totiz tyhle pisty a valce
Jinak trochu vice informaci je napriklad zde:
http://www.xtz750.com/index.php/super-t ... 800#p23012
http://www.xtz750.com/index.php/super-t ... =800#p8264
detaily:
850 piston:
little end bearing dia, 19.88mm
center of bearing to crown, 27.16mm
skirt height, 4.5mm
gudgeon pin offset, 1mm
piston dia, 89.42mm
engine, 89.5x67.5 mm (bore x stroke) 849.3cc
750 piston:
little end bearing dia, 19.88mm
center of bearing to crown, not sure.....
skirt height, 4.7mm
gudgeon pin offset, 1mm
piston dia, 86.92mm
engine, 87x63mm (bore x stroke) 749.1cc
if you re-bore a 750 barrels to take the 850 pistons you would get a theoretical 792.8cc engine however this doesn't take into account the skirt or crown height!....i don't think you could safely take the 750 barrels up to the 89.5mm diameter you need (think the OEM liner is only 3mm and you would need to remove +1.25mm of that) especially when manufactures normal wear limit on these engines is about 0.1mm over OEM only!