I decided to look at my 4900 last night. I picked this saw up last October at the Mastermind GTG, had a bit of a strange whistle when you pulled it over. I did check compression (175 PSI) and good spark but I wanted to see if I could track down the strange sound. One thing led to another and...
View attachment 633179
To go any further I will need to remove that oiler worm gear, any suggestions?
View attachment 633180
The seals look good and compression is great, maybe I should just clean it up from here and put it back together? Opinions?
I will need at least a base gasket for the cylinder and the gasket for the reed block. I do have Modified Mark's scans, but would like to buy some gaskets if possible to same some time & effort.
Is there a case gasket if it go ahead and split it? Might as well get a case gasket too in that case.
Does anyone know the size of the seals? The list that Aaron prepared (I think it was Aaron) says OEM are 530019075, SKF 6904 or National 471466 are subs but are described as a tight fit on the shaft.
Finally I will need a clutch drum for this saw, preferably 3/8" pitch.
Mark