Chainsaw Repair

It appears that there is an updated version of the RWJ-4 from Walbro. I think the carb is now called RWJ-4-1. Anyone got the poop on what has been changed or where I could find out?

More info just came in from a buddy who is a distributor for Walbro, Zama and Tillotson........the new Walbro RWJ-4-1 is a direct replacement for the RWJ-4 but..............it is made by Tilly!

I changed it to the 385 Tilly (IIRC HS-296A) just to see if it made a difference, it did but not in the way you might think. The Walbro was a little taller than the Tilly and would cause the HD filter to contact he high top filter cover and crush the back of the filter when everything was buttoned up.

As far as performance went, the Tilly has a tiny bit larger venturi but I could not tell any difference. I have not done anything to the porting of the saw as of yet so things may change when I do that.

Shep, Merry Christmas and may God bless you and your family!

Tim

That is true I am sure. I may not have quoted the correct carb ID, I will check in the morning because I have tw 385 carbs on my bench. Sorry if I misled you!

I looked up the HS296=17.46 venturi HD12=17.46 venturi RWJ4=19.05 venturi.
Merry Christmas and God Bless You & Family †,
Shep

Yes, that is correct, so the difference he experienced was no surprice!