Bottom end bearings

[roadcapDen]

Cylinders need to come off to split the cases to replace the bearing and roller?
Or can I get at them without doing that?
Thanks all!

[Tim Allman]

Cylinders need to come off to split the cases to replace the bearing and roller?
Or can I get at them without doing that?
Thanks all!

You need only remove the bottom case to remove the crankshaft. However, getting the pistons back into the cylinders from the bottom will be difficult, assuming it's even possible.

[DJM]

Years ago I heard a story about the Honda S800 sports car engines. Apparently some of them had been fitted with suspect bearings or something on the crank, I suppose it could have even have been the pistons and rings. shells. They were subject to an official reccall for repairs
Apparently the repair procedure was to remove the crankshaft complete with bearings from underneath. To replace it was a case of getting all four pistons level and wriggling it about until they entered the bores, if there was a decent shallow chamfer on the bottom of the liners probably wouldn't have been that difficult.
Thinking about it, I believe these engines had roller bearing big ends like the road bikes of the day. If that was the case I can't see another way of doing the job, ideas anyone?

[LOUD MOUSE]

TO replace the chain roller (not the chain tensioner) does require the removal of the head and cylinder assy.
Two bolts hold the roller to the case top. ..................lm

[roadcapDen]

After a great conversation with "the guru" Ed aka emo aka lm, I'm doing a full service on this engine and will get into the bottom end in due time.

Many thanks

[Tim Allman]

TO replace the chain roller (not the chain tensioner) does require the removal of the head and cylinder assy.
Two bolts hold the roller to the case top. ..................lm

Good catch LM.