crank rebuilds

[ADG]

As I cant get to do any work on my bike I was wondering about the practicalities of an engine rebuild.

Can FZR400 and 600 cranks be reground, or do they need welding up before returning to standard journal sizes?

[Evilchicken0]

Welding cranks can be difficult the heat can warp them - I was told this when I was looking for a way to pack out a 3he crank to take s 4jh flywheel.
I'd say to see if you can get the shells first. The cost might be a lot more than another engine though.

[ADG]

Yeah and crank regrinds can be a bit costly to start with.

Anyone selling a crashed low milage 600?

WRT your engine project, could the tapered end of the crank have been done really slowly just laying a bit of weld at a time whilst clamping it in some sort of heatsink? If its possible to use weld to build up the journals for stroker cranks how do they avoid warpage?

[Evilchicken0]

Don't know its a specialist job and for my project the tapered end would still need machining and you can't hold a crank to turn it in a lathe etc.
Do you need a 600 crank ? I've got a 4jh one

[rockTJ]

Don't know its a specialist job and for my project the tapered end would still need machining and you can't hold a crank to turn it in a lathe etc.
Do you need a 600 crank ? I've got a 4jh one

Of course you can hold a crank in a lathe. Was excellent watching my old mini's crank being cross-drilled, having the webs bladed and then balanced. Well the first 5 mins anyway. It's nice seeing where your money goes.



Chris

[Evilchicken0]

Probably just didn't want to do it on mine then