Can any 1 tell me what the bolt is under the front sprocket looks like a drain bolt it as a copper washer 

 If it looks like a lower case bolt, that is also the drain.

Drain plug on a Bultaco should be in middle half of timing side crankcase. Bash plate usually has a hole for access.

I believe, and can check next time I drain the oil, that is a second drain plug.  If the Scorpa had a left side kickstand, you could remove that drain while on the kickstand, rather than use the lower one where the bike must be vertical to drain the oil.

The parts manual shows it simply as a straight bolt / plug.  No special detent or anything, just a plug.

Edited March 22, 20188 yr by pmk

Thanks handy to know 

On the clutch case there is a bolt that has a slightly larger head to it, this is to grain the clutch oil. My photo shows the gearbox drain plug. Detent plunger boss is shown left of pic.

Edited March 21, 20188 yr by section swept

section swept where talking about scorpa not bultaco.

On 3/20/2018 at 2:57 PM, lineaway said:

 If it looks like a lower case bolt, that is also the drain.

The drain on the Scorpa SY250 he is referencing, is nothing like a standard case bolt.  Case bolts are typical Allen head style, while the drain is a hex head bolt style with built in flange to help seal the copper washer.

He asked about a Scorpa, not a 25  year old Yamaha. I thought maybe he updated.

4 hours ago, lineaway said:

He asked about a Scorpa, not a 25  year old Yamaha. I thought maybe he updated.

Agree, but Bondy does have about half a million very recent posts about that old Yamaha engine in the French chassis.  Besides, is a modern Scorpa still truly a Scorpa, or rather a Sherco with different paint?  He certainly did not ask about Shercos or their granddads, the Bultaco.

Being they never had an engine of their own till now it is hard to say. But Scorpa today is doing well. More popular than ever.