I have a a 4900 and I am trying to find a new Carb for it.
From the online parts diagrams there are two Tillotson carbs listed: HS-168A and HS-176A.
What is the difference and can they be interchanged?
Yes, The saw sat in the basement for about 20 years and the tank HAD gas in it, now it is liquid gunk!!
If I get the tank cleaned out I might try to rebuild the carb, the P & C look great.
The saw was the first one I started logging with out in Montana back in 1980. I ran it for about 10 years before I switched to buying Stihls.
I would like to clean it up, probably just set it on a shelf but I like them all to run.
A new carb might be a lot easier and cheaper in the long run considering the how much gunk might be in the old carb.
Looks like the HS-168A is going to be hard to find but the HS-176A is still available.
Well I used Berrymans Chem-Dip to clean out the gas tank and wow did it work great.
Based on the results I ordered a carb rebuild kit.
Now I just have to wait till it arrives then put the stripped carb in the utlra sound tank and see if I can get the saw running. I'll let you all know how it goes..
From what I could find out the difference between the two carbs (Tillotson HS-168A and HS-176A) seems to be the 176A has a governor valve and the 168A does not, does that sound right?