Author Topic: More Walbro RWJ-4 Stuff  (Read 269 times)

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Offline KilliansRedLeo

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More Walbro RWJ-4 Stuff
« on: December 18, 2013, 04:47:26 pm »
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!
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

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Offline farmboy

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Re: More Walbro RWJ-4 Stuff
« Reply #1 on: December 20, 2013, 10:53:47 am »
Thanks for the info.  I do have a question on one of your 372 BBK's you put a RWJ4 on it and changed it for the 385 Tilly.  Why?
Thanks,
Shep

Offline KilliansRedLeo

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Re: More Walbro RWJ-4 Stuff
« Reply #2 on: December 20, 2013, 11:05:37 am »
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
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline farmboy

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Re: More Walbro RWJ-4 Stuff
« Reply #3 on: December 20, 2013, 09:51:32 pm »
I looked up the HS296=17.46 venturi HD12=17.46 venturi RWJ4=19.05 venturi.
Merry Christmas and God Bless You & Family ,
Shep

Offline KilliansRedLeo

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Re: More Walbro RWJ-4 Stuff
« Reply #4 on: December 20, 2013, 10:11:35 pm »
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!
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
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Offline farmboy

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Re: More Walbro RWJ-4 Stuff
« Reply #5 on: December 23, 2013, 08:03:33 am »
Actually I was suprised on the HS 296 I thought it was larger than 17.46.  Tilly HS service  pdf doesn't show 385-390 HS299 so I don't know on it.  Having found the venturi  on HS296 is same as Walbro HD12 why change em on the 372.
Shep

Offline SawTroll

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Re: More Walbro RWJ-4 Stuff
« Reply #6 on: December 23, 2013, 02:18:12 pm »
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!

Offline SawTroll

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Re: More Walbro RWJ-4 Stuff
« Reply #7 on: December 23, 2013, 06:18:37 pm »
Actually I was suprised on the HS 296 I thought it was larger than 17.46.  Tilly HS service  pdf doesn't show 385-390 HS299 so I don't know on it.  Having found the venturi  on HS296 is same as Walbro HD12 why change em on the 372.
Shep

It looks like the only difference between the HS-296 and the -299 is the adjustment limiters (on the -296).

The difference is the same with the -298 vs. the -300, on the 395xp. The venturi also is the same (nominal) 17.46 mm on all those carbs.

 

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