Author Topic: Husqvarna carb 390xp 365xt 372xt info  (Read 1878 times)

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Offline Cut4fun .

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Husqvarna carb 390xp 365xt 372xt info
« on: May 11, 2013, 11:35:30 am »
The below was posted by Shep Farmboy and thought it should be saved somewhere safe and not get lost.

Husqvarna 390 365 xt  372xp xt

While doing a little carb research I came across sonething interesting on the 390.  Now uses a Walbro WJ-118 carb instead of the Tillotson HS.  WJ-118 venturi size is 17.46.  365XT and 372XT RWJ-4 venturi size is 19.05mm.  The RWJ-4 would be a direct swap.  Larger carb may work well with MM and WPort.
Shep

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Offline 660magnum

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Re: Husqvarna carb 390xp 365xt 372xt info
« Reply #1 on: May 11, 2013, 12:14:35 pm »
These carbs have a angled mounting bolt pattern and not horizontally straight across.

They will also adapt to the old style 372 if you use the 385 boot and 372XT filter elbow with the baffle removed but you best have some porting on a big bore.

The RWL4 was originally intended to have mainly plain air going through the top half of the throttle body above the butterfly for the strato charged setup on the XT.
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Offline SawTroll

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Re: Husqvarna carb 390xp 365xt 372xt info
« Reply #2 on: May 12, 2013, 01:29:37 pm »
Well known info as far as I know, but it is a good idea to save it. ;D

Of course it is possible to increase the stock venturies of the different carbs as well, but you really have to know what to do, and what not to do...

Btw, I am reasonably sure that no Tilly HS carbs have a larger venturi than 17.5mm.

Offline aclarke

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Re: Husqvarna carb 390xp 365xt 372xt info
« Reply #3 on: July 07, 2014, 06:48:06 pm »
Anyone have the 365xt carb model number, wanna try one on the 7900

Thk, Adam

Offline Cut4fun .

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Re: Husqvarna carb 390xp 365xt 372xt info
« Reply #4 on: July 07, 2014, 07:24:13 pm »
Anyone have the 365xt carb model number, wanna try one on the 7900

Thk, Adam

Check and make sure. Just throwing darts.  http://wem.walbro.com/walbro/product.asp?CategoryName=B156&Series=RWJ&partnum=RWJ-4-1&GroupName=Chain%20Saw&FamilyName=HUSQVARNA
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Offline farmboy

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Re: Husqvarna carb 390xp 365xt 372xt info
« Reply #5 on: July 07, 2014, 09:46:38 pm »
RWJ 4 is correct.  19.04mm venturi IIRC. 
Shep

Offline aclarke

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Re: Husqvarna carb 390xp 365xt 372xt info
« Reply #6 on: July 07, 2014, 10:48:02 pm »
Thanks a lot!

Offline 660magnum

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Re: Husqvarna carb 390xp 365xt 372xt info
« Reply #7 on: July 07, 2014, 11:22:35 pm »
The RWJ-4 has a divider in between the choke shaft and the throttle shaft. It is difficult to see. It is made that way for the strato. So one half the carburetor is dry.

But most people say to leave the divider in there when Using on a big bore old style 372.

The carb screws have a spline around their outside. This is the same spline as the splined screw driver for the small saws.

There is a spring loaded collar sleeve under the head of the screw that works as a limiter. The splined screw driver pushes this collar out of the way so you can adjust the carb as if there was no limiter.

You can also take the carb screws out and throw away the sleeves or you can mount the sleeves on a mandrel and cut the tabs from the sleeves so the limiter function no longer works and adjust the screws with a flat screw driver. 
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Offline KilliansRedLeo

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Re: Husqvarna carb 390xp 365xt 372xt info
« Reply #8 on: July 08, 2014, 11:33:38 am »
The last time I ordered an RWJ-4, I was informed by my distributor that Walbro no longer manufactures the RWJ-4! It is now manufactured by Tilly and is called RWJ-4-1. So I ordered one and it looks like the divider is no longer there. Perhaps I'll take it apart and post some pictures.
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Offline KilliansRedLeo

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Re: Husqvarna carb 390xp 365xt 372xt info
« Reply #9 on: July 08, 2014, 11:43:39 am »
660, you are correct, the divider IS still there, but it sure is hard to see. Does not look to be a big deal to remove it. Any suggestions?
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

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