Splitting a P200 crank

[mushroom]

I need to change the big end bearing but can't find anything online that shows you how to do it
Is it that hard a job that it's easier to buy a crank and conrod complete ?

[mickymidas]

Take a look at Scooterhelp .com ....Might be of some use.

[mushroom]

I had a look on there and he reckons you need to take it to a mechanic to split the crank

[Ivan_200]

you have to press out the pin and realign the halves, almost impossible to do on your own without proper tooling

[mushroom]

OK fair enough, looks like I'll just get a new one complete then

[gaz_powell]

to split a crank you need a hydraulic press, correct size drifts and correct size wedges to block the webs I can split them at work wouldnt attempt to rebuild them as you need a v block/dial gauge and experience

any good motorbike engineer can do it - i use a local shop he charges £15-20 (labour only) to split, rebuilt and balance

i wouldn`t change the bearing without changing the rod - when the bearing goes it usually takes the inner surface of the big end with it

a rod kit is around £35.00 + so still cheaper than a good crank - if it is piaggio webs and the threads and tapers are good i would rebuild if not buy new

[mushroom]

to split a crank you need a hydraulic press, correct size drifts and correct size wedges to block the webs I can split them at work wouldnt attempt to rebuild them as you need a v block/dial gauge and experience

any good motorbike engineer can do it - i use a local shop he charges £15-20 (labour only) to split, rebuilt and balance

i wouldn`t change the bearing without changing the rod - when the bearing goes it usually takes the inner surface of the big end with it

a rod kit is around £35.00 + so still cheaper than a good crank - if it is piaggio webs and the threads and tapers are good i would rebuild if not buy new

It was in a seized engine that's now been stripped.
I tried moving the conrod round the crank but it felt stiff and notchy
It's moving easier now but I'm not sure I can rebuild it like that and trust it to be OK
For piece of mind I'll change the lot

thanks for all the advice