Torquing the cylinder to the bottom end with a proper torque wrench is impossible because of the limited space between the nut and the fins so I thought, why didn't Yamaha puts holes in the fins so you could reach a socket down and properly torque the nuts? I decided I would experiment with my cylinder and put 4 holes in the fins so I could easily torque the nuts. I'm not sure if I'm the only one to do this but looking around I couldn't find anything like it.
I first started off by drilling pilot holes from the bottom to the top, that way I knew the holes would be centered over the stud. I then enlarged the holes just big enough to get a socket through them. This is how they came out.
As you can see, the holes do not impact the head gasket mating surface and they do not effect any of the ports. These holes make it drastically easier to torque the cylinder down to the right spec compared to guessing with a wrench or using an adapter. The 2 front nuts which are normally very difficult to get to are a breeze.
I checked compression before and after the modification, 150 psi. I have no idea what this will do to cooling or durability. I made sure to install all the anti-vibration rubbers on the cylinder and the head to hopefully rule out any increase in vibration through the fins. As soon as I get the chance to run it I will post temperatures to compare to a normal set up. If anyone else has done this feel free to chime in. Thanks for reading.
I first started off by drilling pilot holes from the bottom to the top, that way I knew the holes would be centered over the stud. I then enlarged the holes just big enough to get a socket through them. This is how they came out.
As you can see, the holes do not impact the head gasket mating surface and they do not effect any of the ports. These holes make it drastically easier to torque the cylinder down to the right spec compared to guessing with a wrench or using an adapter. The 2 front nuts which are normally very difficult to get to are a breeze.
I checked compression before and after the modification, 150 psi. I have no idea what this will do to cooling or durability. I made sure to install all the anti-vibration rubbers on the cylinder and the head to hopefully rule out any increase in vibration through the fins. As soon as I get the chance to run it I will post temperatures to compare to a normal set up. If anyone else has done this feel free to chime in. Thanks for reading.