Scooterbrain
XS650 Enthusiast
Good evening follows.
I have my 650 on the bench with the top end fully assembled and adjusted and I just noticed something that I overlooked. With the plugs Out, it takes far more effort to rotate the engine than I expected. It seems obvious that since I can rock it a degree back and forth that the tension is between the rings and the cylinder and not involved with the mains or rods.
I measured my standard bore to be Well within spec and I mean really close to stock despite the 18k on the odometer and the pistons measured out in a similar fashion. I Ordered Standard Rings from MikesXS.
Unfortunately I failed to measure and evaluate ring gap vs cylinder bore. I honed the bore and slid the cylinders down over the ringed pistons with some effort.... pretty tight but they slid on down. I assembled this with some but minimal lubrication so as to facilitate seating of the rings !
The torque does not register on my old cheap Torque wrench when I rotate the engine by that method so its less than my wrench will measure. Feels like about 30 ft lb from what I remember. and it does roll around fine without obstruction. What I am Fearing is that I have ZERO ring gap and I will have to tear this thing back down again so I am asking if anyone here has seen the same thing in one of their builds and what the recommendation is. Its just really stiff when turning over by hand.
Regardless of the crank position I cannot turn the engine with just my Hand on the Alternator Rotor which is well you know, something like 6 in in diameter but with considerable effort it turns fine with 3/8 in ratchet.
Thank You all !
I have my 650 on the bench with the top end fully assembled and adjusted and I just noticed something that I overlooked. With the plugs Out, it takes far more effort to rotate the engine than I expected. It seems obvious that since I can rock it a degree back and forth that the tension is between the rings and the cylinder and not involved with the mains or rods.
I measured my standard bore to be Well within spec and I mean really close to stock despite the 18k on the odometer and the pistons measured out in a similar fashion. I Ordered Standard Rings from MikesXS.
Unfortunately I failed to measure and evaluate ring gap vs cylinder bore. I honed the bore and slid the cylinders down over the ringed pistons with some effort.... pretty tight but they slid on down. I assembled this with some but minimal lubrication so as to facilitate seating of the rings !
The torque does not register on my old cheap Torque wrench when I rotate the engine by that method so its less than my wrench will measure. Feels like about 30 ft lb from what I remember. and it does roll around fine without obstruction. What I am Fearing is that I have ZERO ring gap and I will have to tear this thing back down again so I am asking if anyone here has seen the same thing in one of their builds and what the recommendation is. Its just really stiff when turning over by hand.
Regardless of the crank position I cannot turn the engine with just my Hand on the Alternator Rotor which is well you know, something like 6 in in diameter but with considerable effort it turns fine with 3/8 in ratchet.
Thank You all !