Additionally the diiference was the thin and thick ring. I have two Craftsman saws 3.7. One is thin ring and one thick ring(3.8). Both are red, so I really think you need to check the piston to see which is which.Craftsman offered both, first the 3.7 and then the 3.8. The 3.7 was red, and most 3.8's gray and black, but I've read a few 3.8's were also red - probably using up old cases in the transition.
The only difference between the 3.7 and 3.8 seems to be what was chrome plated, the cylinder or the piston. My theory for the change is this was a cost saving move and it must be cheaper to chrome a piston than a cylinder. Also from what I've read, the 3400 always had an alum cylinder and chromed piston like the 3800/3.8
Got the 245 running again. A few weeks ago while helping a neighbor cut up the trunk of a maple, it ran out of fuel then would not restart after the tank refill. Next day, same thing - would not start. I popped off the carb cover (pump side) and sprayed some carb cleaner in it. I did notice one of the screens was pretty gunked up. Reassemble, +gas in the tank, pull the rope a few times, and off she went.
That wasn't to prime it, but to clean it. And yes, clean tank, new filter. I do run a splash of carb cleaner in the fuel. I wonder if it worked better than expected and what it loosened up clogged the screen.Bobby, be careful using spray to prime your saws, next time spray mixed fuel to prime, I thought all was new? Fuel filter etc? Tank cleaned?
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My brother told me today he saw that saw come off a guys truck right before it got crunched. Said the guy made two trips to get it all up.
Steve
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