Originally Posted by
John_M_
Thats what I expected, the intake valve opens later on the rear cylinder... works in a similar way to exhaust blow down, but instead improves the induction velocity / cylinder fill... the rear cylinder is the stronger of the two,... the front cylinder absorbs a bit more power, but the two cylinders balance out across the 720 degree engine cycle.
The front cylinder is the right hand cylinder ( starboard side )... and the rear cylinder is the left hand cylinder ( port side ) when viewed from sitting in the cockpit... that's how its described in the RCM Saito 4 stroke handbook for the saito twin cylinder engines...it has some useful information, but unfortunately that book was published before the inline twins were released... I did see someone uploaded a scanned copy in pdf format, but I don't recall where it was posted... it only really matters to the person standing in front or from behind, as long as you have the cylinder parts relationship understood, thats all that really matters.
Yes sir. The 200ti however is documented in the inverted mounting orientation, that's how Saito designed it to run. So once flipped over inverted the rear cylinder is the right, the front is the left. Tricky!
That threw me at first too.
I would agree that the cam profiles could be slightly different, however this is a preowned engine with different wear patterns on each tappet. One of them is worn into a domed shape and two of them have flat spots at the edges.
As it is, the opening and closing events are measured from just off the base circle of the lobe, so irregularly worn tappets could easily account for a few degrees of crank angle variance when measuring. The only way to be 100% sure is to measure using new parts and zero valve lash.