More Eagle 60 tidbits. The 1st Eagle, 1972 had only muffler lugs above and below the exhaust. The head had what looked like gang slotted fins, shallower and finer than later, and the circumference was polished, not as cast. 1973 was the same, but had a head with cast fins and circumference.
In 1974 the exhaust valve was eliminated, muffler lugs were added ends of exhaust stack and the bottom of the rod was bushed making it larger. If you look inside the 72 or 73 case, you'll see there is about no clearance where the bottom of the crank misses the case on the right side; in fact the cast may have been ground here. Now look at the case of the 1975 Tower Sport 60 ( a 1974 Eagle clone). You'll see a fillet has been added under the stack and into the right mounting lug. This allowed for space inside the case to clear the new larger rod end. Look at the 72 and 73 cases in this area and you'll see the fillet is missing.
Now look at the 1978 Export Eagle. The head is obviously changed with the plug vertical and moved toward the exhaust side. A picture shows the deeper protrusion for much higher compression for running on no nitro fuel. But look at the fillet area; the fillet is shorter and no longer intersects the lug. That is because the bottom of the case is thicker and larger in diameter. This change was actually made in 1977. This rear cover is larger and won't fit earlier engines. The 1980 Eagle, the last one, was like the Export, but had a little lower compression and Fox's new MK-X carb.
Topic: What Fox .60 do I have? (Read 3551 times)