new cylinder time
Posted August 20, 2011 - 10:26 PM
my 426 went bang last night so i stripped it down and took it apart this morning to find a smashed up piston and a cracked cylinder. the cause of the problem was one side of the selector fork in the gearbox breaking off and making it's way up to the crankshaft. now i need a new piston and cylinder.
Who makes cylinders for these bikes (big bore or standard)? what's the bore and stroke? and are the YZ cylinder and pistons the same?
any help would be appreciated, i want to get this bike back in the dirt as soon as possible.
Posted August 21, 2011 - 10:05 AM
Posted August 22, 2011 - 10:17 PM
I managed to find a good second hand barrel and the gearbox parts here in australia, (lucky me). can't wait to have the bike back in the dirt
Posted August 23, 2011 - 06:44 AM
I have another question. i sourced all the bits that i should need to put the bike back together except a new crankshaft. i am fairly sure the crankshaft is fine, it has seen a few knocks from the bits of gear floating around but i doubt it has been knocked out of balance. i ran my vernier callipers around the outside of the two counterweights and got measurements within 0.1 mm at all points on the counterweights.
are these acceptable measurements?
is there anything else i should check/measure to see how my crankshaft is?
are these cranks known to be fragile at all or can they take a bit of a beating?
thanks everyone for your help