A Barrett brother with a Creamsicle?? The heck you say!

[RIDE-RED 350r]

So my lil Creamsicle is as assembled as I can make it today. I'm missing a half dozen more parts including a coil so I wasn't able to fire it up. I put it together 100% bone stock for now, just to get a feel for it as designed. Compression test yielded a whisker over 150psi. Happy with that.

Here's the pics: old cylinder, pretty confident it is salvageable
New cylinder.

Case going back together

 

[RIDE-RED 350r]

More assembly

 

[RI Chevy]

What did you think of it Joe?
Alot different than those Hooskies, huh? Lol
It is nice and clean. Nice job. [emoji106]

 

[RIDE-RED 350r]

Couple more.

Look at those open transfers on the old cylinder. Haven't seen open transfers quite like that before.


As she sits now. Cute lil Creamsicle


Many thanks to my good friend @PA Dan for the parts! Just a few more to go

 

[RIDE-RED 350r]

What did you think of it Joe?
Alot different than those Hooskies, huh? Lol
It is nice and clean. Nice job. [emoji106]

Yessir, in some ways, particularly the coupling of the intake to the carb box. Not bad, just different.

 

[PA Dan]

I'll have a couple parts in my stash! I'll be home in a couple hours and check!

 

[RIDE-RED 350r]

All good Dan. You have done plenty, so if you have some of the stuff I need and are willing to part with them, you will be getting some coin for them.

 

[XP_Slinger]

Looks good all put together Joe. Cleaned up really well too.

 

[RIDE-RED 350r]

So I've been puttering with this 024 and chasing my tail a bit concerning an issue of fuel supply not being able to keep up with demand. Runs ok on initial startup but goes lean rather quickly.

So, after pressure and vac testing the saw and finding that to be good to go, I started trying different things to narrow down the cause. Firstly, all new OEM fuel and impulse line. So I pulled the carb and verified impulse at the fitting with the carb and then old buddy Dan reminded me that I was supposed to drill the fuel line hole in the tank to 7/16" to properly fit the new OEM fuel line. I thought bingo, problem solved! So I do that, and still the thing goes lean after initial startup. What the hell.... So I pull and disassemble the carb for the fourth time, looking for any little smoking gun I may have missed and have a head slapping moment.... I'll post a pic of what I found and see how many of you pick up on it. I know it's a lesson I won't soon forget... You guys already in the know, don't comment yet. I'm gonna bet I'm the biggest idiot in the room and everybody will catch it right off the bat! Lol!

 

[RI Chevy]

Nice and clean at least.

 

[PA Dan]

I know but you had to tell me....so you have company in the idiot room!

 

[RIDE-RED 350r]

I know but you had to tell me....so you have company in the idiot room!

Lmao!!

 

[RIDE-RED 350r]

Ok so the problem was that there should be little flapper check valves in the triangular cutouts in the pump diaphragm. Without them, there is nothing to keep the fuel moving in the right direction, and incidently, nothing to keep it from going the wrong direction. Essentially, the carb would draw enough fuel to run OK with the choke applied, but once the choke was switched off, the pump diaphragm would basically just be juggling fuel wherever as opposed to drawing it from the tank and pushing it through the metering valve. Basically all pumping action would pretty much cease.

No idea how or why those flapper valves are absent from the diaphragm, the carb is exactly is it was when I rescued the saw from the dealers junk pile. I can't think of any other time I've seen a pump diaphragm absent those flapper valves.

So, I await the arrival of a carb kit and then I'm certain my little 024 will run like it should.

 

[PA Dan]

Everyone must be napping....[emoji42][emoji42][emoji42]

 

[RI Chevy]

LOL

 

[RI Chevy]

Maybe the flaps get sucked so the carb flows more fuel and doesn't lean out and pass air?

 

[RIDE-RED 350r]

Maybe the flaps get sucked so the carb flows more fuel and doesn't lean out and pass air?

Those flappers are essential to the pumping of the fuel from the tank to the metering side of the carb. They are basically a one way check valve. When the diaphragm moves up fuel is drawn into the pump diaphragm pocket. When it move down, it pushes that fuel into the metering valve cup. Those flappers keep the fuel moving in the right direction.

 

[RI Chevy]

Kinda like what I was getting at, just in my language. LOL

 

[PA Dan]

...

 

[RIDE-RED 350r]

Borrowing a diagram Dan posted in another thread awhile back. The top section above the Venturi is the pump side. You can see the flapper valves represented at the fuel inlet and metering valve.