I have noticed underneath my 88 TY 250 s there are 2 drain bolts.

The first is in the middle at the rear of the engine, the Gearbox Drain Bolt. I have used this to drain the oil from the clutch and gearbox.

The second bolt is smaller and underneath the crank. www.tytrials.co.uk list is as Crankcase Drain Bolt. What is this for? Does the crank have it's own oil, or is it for draining fuel oil which has found it's way into the crankcase?

Finally I am pretty sure my rear shock has started to leak oil, is this servicable or should I look for a new unit.

Thanks in advance

 The crankcase drain bolt usually is never used, but should the bike ever be submerged it sure is useful!.

I stored a TY for a few years and filled the crankcase with oil to prevent corrosion.  The bolt was useful when it came time to revive the bike.

Thanks All.

I've drained the oil in the clutch/gearbox twice, as it was milky. I assumed this was condensation in the crankcase.

I'll take the crankcase bolt out to check there isn't anything lurking in there.

Cheers