Pistons and Valves in Sync?

Rockitdoc

Rockitdoc

Hero member
Location
Fort Collins, Colorado
I'm putting the head back on my RGS1000SFC after a long hiatus, so my memory is fading regarding how I took her apart.  It seems like  I remember someone saying or reading somewhere that with the valves indexed in the correct position the number 1 piston (the one on the clutch side) should be at TDC.  Is this correct?

 
 
On a 120 with #1 (clutch side) at TDC the cam lobes should be facing somewhat together and down.  If viewed from the left side and taking the head face as being at 9 o'clock and 3 o'clock, the exhaust lobe should be roughly 4 o'clock and the inlet 8 o'clock.  Very roughly.

A 180 is assembled on the opposite stroke, #1 lobes facing away from one another.
 
breganzane said:
On a 120 with #1 (clutch side) at TDC the cam lobes should be facing somewhat together and down.  If viewed from the left side and taking the head face as being at 9 o'clock and 3 o'clock, the exhaust lobe should be roughly 4 o'clock and the inlet 8 o'clock.  Very roughly.

A 180 is assembled on the opposite stroke, #1 lobes facing away from one another.
Click to expand...

My cams are lined up, thusly: 
S-120CamLinedUp_zps9a5f73cd.jpg
  Is this what you meant?

 
Sorry, I misunderstood you.  Yes your photo shows exhaust cam correct for #1 cylinder at tdc, assuming F1 cams and all other things being correct.  The description I gave above is a gross error check to make sure you're in the ballpark.  In the event your sprockets have been removed from cams it's possible to install sprockets to cams 180deg out.
Cheers
SteveB
 
breganzane said:
Sorry, I misunderstood you.  Yes your photo shows exhaust cam correct for #1 cylinder at tdc, assuming F1 cams and all other things being correct.  The description I gave above is a gross error check to make sure you're in the ballpark.  In the event your sprockets have been removed from cams it's possible to install sprockets to cams 180deg out.
Cheers
SteveB
Click to expand...

I never took the head apart.  I just removed it from the barrels to inspect valves/condition.  Motor has 3200 km on it.  Everything looked fine, so I'm just reassembling as disassembled.  Should be fine, assuming it ran ok before being parked.

 
You must log in or register to reply here.
Back
Top