Saw builds

[jmssaws]

They'll feed a ported 395 or 390.

2 out on the low and 3 on the high.
It wouldn't run a 372 I had it on.
It's brand new one

 

[jmssaws]

At the end of the cut I start pulling hard and the clutch gives up.

 

[blsnelling]

2 out on the low and 3 on the high.
It wouldn't run a 372 I had it on.
It's brand new one

Then I suspect there's something wrong with it. I've run them on quite a lot of saws with no issues getting them fat.

 

[Deets066]

Only time I've Ran an RWJ was on Mikes Solo. That thing was temperamental and always lean. Even at 2-3 turns out

 

[jmssaws]

Only time I've Ran an RWJ was on Mikes Solo. That thing was temperamental and always lean. Even at 2-3 turns out

The 3 I've tried to use were exactly the same as what you experienced.
3 turns out and starving after a cut

 

[Mastermind]

I Don't know if you've done this before. After drilling the hole you can use a larger bit to bevel it. When doing this I hold the bit very straight by hand and spin it in reverse direction so the cutters don't bite and ruin it. It doesn't take very much at all. To finish it off I'll sharpen a round toothpick to match the shape of the metering pin. Then I chuck it up in the handpiece to high speed polish with it. I use wd-40 type stuff for compound.
There's no going back with this mod. I've ruined one good HD carb doing this and that's because I didn't know what I was doing at first. Those metering seats are made of a softer material and drill bits fly through em with little to no resistance.

One example of a small carb used to pump a higher volume of fuel is on the Poulan Pro 325. Its a 50cc saw with a little itty bitty wt walbro carb on it. The intake and bore of this carb is 15mm, with a tiny venruri. If I have to guess I'll say 10-12mm. But the metering passage is damn near large enough to put my finger through. AND...Lol... it still has a flood limiter under the little brass plug on the side, just like the older big tilly carbs.

I've got a pile of carbs I've ruined Jim.

If you wanna make an omelet....ya gotta break some eggs.

 

[jmssaws]

I've got a pile of carbs I've ruined Jim.

If you wanna make an omelet....ya gotta break some eggs.

I ruined about a dozen wj walboro trying to bore them out.
I gave up finally.

 

[Mastermind]

I ruined about a dozen wj walboro trying to bore them out.
I gave up finally.

What was the problem you were having?

 

[jmssaws]

What was the problem you were having?

Idle problems.

 

[huskihl]

The rwj is like this because it's original intention in an xtorq is to provide 20 or 30% (or 40) more air than normal, correct?

 

[Mastermind]

You fellers that are having trouble with the RWJ.........are you pulling the divider?

 

[drf256]

Why would idle issues occur from boring out the Venturi?

I thought the idle fuel outlets were in front of the throttle plate.

 

[huskihl]

You fellers that are having trouble with the RWJ.........are you pulling the divider?

My issue is more about running one on a 7900 or old school 372xp

 

[Mastermind]

My issue is more about running one on a 7900 or old school 372xp

As delivered......or with the divider removed?

 

[TreeLife]

Are you referring to boring the throttle bore/barrel or the jets?

 

[huskihl]

As delivered......or with the divider removed?

In either of those, I wouldn't have a divider. I'd be using it for bore and venturi diameter if it could provide enough fuel

 

[P.M.P.]

My issue is more about running one on a 7900 or old school 372xp

For the 7900 just get a hold of @Poleman

 

[huskihl]

Are you referring to boring the throttle bore/barrel or the jets?

I'd guess their piles consist of a good mix of both

 

[Chainsaw Jim]

View attachment 64413

WJ 69 on an 024

WB beeeoooootch! Lol

 

[Mastermind]

In either of those, I wouldn't have a divider. I'd be using it for bore and venturi diameter if it could provide enough fuel

Without the divider it will never be able to provide enough fuel. The low pressure signal would be weaker than it is calibrated for.

The divider is not an airflow restriction in any way though.