My 2F has low compression. About 7.24 bar or 105psi. Part of that is my altitude. Vacuum is also low, again, altitude. Between 80 kmh (50 mph) and 97 Kmh (60mph) the 2F is really sweet. 4.11s, 215/75R15 treads, 1:1 gears. It is basically a scrap-yard engine. I keep getting performance gains as I tinker. I really like the smallish tires, as it keeps my leaf springs original, and I get good off-road articulation, and slick road traction with that compared to my previous 40 with curvy springs and 33" tires.
Early on, I observed a groove on the part of the rocker arm that pushes the valves. I figured that it was about .003" deep, and I adjusted my valves with less than .003" lash because a feeler gauge would bridge that space anyway. It approximates a factory setting accounting for wear. Plus, it keeps the valves opening up as much as possible. Also, the amount of baked on oil on the top of the intake valves is certainly a restriction. So, I installed new valve stem seals, and I'm using a valve-cleaning formula pump gasoline. Almost one year of street driving, and the 40 feels really confident in traffic. Just got a new OEM carb for non-USA, which has improved things on the low end, maybe highway as well. Non-USA vac advance distributor. Headers. Original coil with igniter - 1mm spark plug electrode gap.
Your compression seems good. I bet that you could work on air/fuel delivery, or quality of spark to get more power.
Early on, I observed a groove on the part of the rocker arm that pushes the valves. I figured that it was about .003" deep, and I adjusted my valves with less than .003" lash because a feeler gauge would bridge that space anyway. It approximates a factory setting accounting for wear. Plus, it keeps the valves opening up as much as possible. Also, the amount of baked on oil on the top of the intake valves is certainly a restriction. So, I installed new valve stem seals, and I'm using a valve-cleaning formula pump gasoline. Almost one year of street driving, and the 40 feels really confident in traffic. Just got a new OEM carb for non-USA, which has improved things on the low end, maybe highway as well. Non-USA vac advance distributor. Headers. Original coil with igniter - 1mm spark plug electrode gap.
Your compression seems good. I bet that you could work on air/fuel delivery, or quality of spark to get more power.
