S1 Piston size

Rumbelow · Post by **Rumbelow** » Mon May 31, 2010 8:51 pm

I just started to sort out my s1 project to check what I needed and whats useable or not the engine number on cases says S1 but when I took heads of to check condition all looked ok pistons on std but bore mesaured about 53mm does this mean S2 barrells + heads fitted and is this ok or will it cause problems thanks
Dave

kas750 · Post by **kas750** » Mon May 31, 2010 8:55 pm

Yep its a 350..How many fins does the barrel have? It could be that you have bored out early s1 cylinders.

Rumbelow · Post by **Rumbelow** » Mon May 31, 2010 8:59 pm

How many fins should it have will check when I get back out to garage thanks

Ståle · Post by **Ståle** » Mon May 31, 2010 9:52 pm

Think it's 6 on S1 and 7 on S2. If you look at the bottom of the cylinder, can't remember if it's left or right side of the engine, the cc is cast in the cylinder.

scouse · Post by **scouse** » Mon May 31, 2010 11:18 pm

I thought that early S1's where sleeved down S2's (hence the ability to bore them out )

Gary T

husson73 · Post by **husson73** » Tue Jun 01, 2010 9:19 am

scouse wrote:I thought that early S1's where sleeved down S2's (hence the ability to bore them out )

Gary T

right

Rumbelow · Post by **Rumbelow** » Tue Jun 01, 2010 5:55 pm

I have counted fins 7 on the middle cylinder + 6 and a half on outer cylinders but cant see any casting to say cc

simonh · Post by **simonh** » Tue Jun 01, 2010 8:22 pm

done back in the day then, will have ground the cc off

husson73 · Post by **husson73** » Wed Jun 02, 2010 8:56 am

Rumbelow wrote:I have counted fins 7 on the middle cylinder + 6 and a half on outer cylinders but cant see any casting to say cc

7 fins mean S2 barrels

6 fins mean S1

SAM · Post by **SAM** » Wed Jun 02, 2010 10:04 pm

Could be rare 325cc