Fossil, can you list what applies to which model? My knowledge is limited to the 5400 has something larger/thicker (bar studs? crankshaft??) than what's on the 5200 & 8500.
The info is spread around this thread, but I never copied it into a document
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My knowledge is limited as well but, here's what I
think I remember from what I've read in the past. Modified Mark, Eccentric and others could list them off easily and more accurately.
5200
As time went on two extensions were added to the front of the saw case with three caps screws through the extensions. The old case has a flat fron like a 3400.
The the top cover was secured with a single nut with spring washer and this was changed to three screws. I have seen a pic of a slot screw instead of the nut.
An improvement was made to the starter cover spring anchor.
The 5200's all have 5/16" bar studs.
A top cover hand guard.
5400.
A larger tank with a hand guard (foot pad to some) on the rear handle was added. This also increased the distance between the handle bars. A new throttle linkage was required.
3/8" bar studs replaced the 5/16" bar studs but since the IPL for the 5400 shows both stud sizes and clutch covers I suspect they may have been a running change during 5400 production.
The front handle bar was changed (5400 and 8500 the same). A new spike design was introduced.
Both a top cover and handle bar mounted hand guards were used.
8500
New top cover and air filter system + the 5400 changes. More black in the paint scheme.
The top cover hand guard was used.
Chain brakes were available on all three models. I'm not sure when it was first available. There are two styles. One has the steel tube flag and the other is diecast. I have a diecast model.
The list is incomplete I feel and maybe one of the guys that know all three varieties can chime in.
The engine, crankshaft, piston, rod and cylinder, oil pump and clutch, are common to all three models, believe the ignition is the same as well
I believe they all wore the Tillotson HS 176A carbs.
Mine has an HS 168 carb which is the same carb minus the governor. It was used on the 4200 and may have been swapped out at some point.
For those of you that have not run one, They are all that folks say about them.
They make the 5 cube Pioneers and the 925 Homelites look slow although those saws are among my favorites.
I took mine to the Genius Fest GTG in Aug of this year where almost all of the attendees were new saw guys. It opened a few eyes. There is definitely a wow factor that is hard to find in other stock saws.
They are well worth the wait to find one. The 4200 is a great saw but does not come close to a 5200. Having said that, it is a very strong 70cc class saw.
There is also a 77cc version (4900 and 7700) which I have not run but those who have say they are comparable to the 85cc version.
Considering that the saw was introduced in 1975, I don't think there was anything in it's class that would run with it for another 10 years or more.
YOU GOTTTA GET ONE!