Hi guys,
Hello from sunny, at the moment, Sydney Australia.
I'm trying to hopefully get some info on the FZS600 cylinders, rods and pistons for an overbore project on a 3TJ1 FZR400.
I'm trying to avoid ending up with a workshop full of parts just for the purposes of taking measurements, especially when many bits will need to come from OS.
As an outline, because it's essentially de-stroking a YZF600/FZS600 from 49.6mm to 40.5mm, I'm trying to avoid removing bulk material from the cylinders to maintain the gasket mating surface.
What I know for certain - Yamaha in their wisdom built an incredibly versatile crank, with many dimensions which are maintained across many many bikes.So the conrod big ends go onto the FZR400 crank - no issues. Conrod little ends are 17mm bore, so compatible with YZF600 pistons if necessary.
Regarding the FZS600 rod and piston measurements, this is only if someone has either an engine in parts or can point me in the right direction to a service manual or the like for the dimensions on the internals.
I have some of the details from another forum where the FZR600 crank was used to build a stroker YZF600, but as you can imagine it's a very old post.The measurement details are missing, however in that case they built a spacer plate.
Ideally I'm looking for just the height of the FZS600 cylinder block to begin with because the OP just says that they're 2cm (must be a typo), likely meaning 2mm shorter than the YZF600 cylinder block, the height of which I don't yet know either.
Past that he mentions that the FZS600 conrods are 3mm shorter than the YZF600 conrods.So eye to eye conrod length measurement of the FZS600 rods if available/possible.
Then there is the last element, the compression height of the FZS600 pistons.
If anyone has a reliable source for the info, or can take the basic measurements I'd very much appreciate it.
Glenn
