Pick the best carb for MS260 Pro...

[Black Dog Chainsaw]

I don't got a 260. haha I was joking.

I was just making the challenge real for you.

 

[Black Dog Chainsaw]

Me neither but I want one

a couple of you need to go back and read my 029/039/290/390 carb statement...

 

[bikemike]

 

[bikemike]

a couple of you need to go back and read my 029/039/290/390 carb statement...

Got pics and measurements of those carbs

 

[Black Dog Chainsaw]

Got pics and measurements of those carbs

they are a direct replacement fit from one to the other. If you are asking venturi size... no I don't have that info. Considering the 029/290 carb can feed a 64cc 039/390 top end without a problem... I'm sure you'll feed more fuel/air mix than the stock wt194 50cc carb.

 

[bikemike]

they are a direct replacement fit from one to the other. If you are asking venturi size... no I don't have that info. Considering the 029/290 carb can feed a 64cc 039/390 top end without a problem... I'm sure you'll feed more fuel/air mix than the stock wt194 50cc carb.

IL look into that

 

[Windthrown]

029/290 carbs come with smaller jets than the 310/039/390 carbs. Better off with the larger jet 310/390 ones.

As for the OP, the Walbro 22C is second only to the Walbro 194 in quality/performance on the 026/260 line. Fully tuneable, and it will run it just fine. And if you want to make that 260 cut faster, put a Picco/low profile B&C and rim on it. With the new Stihl Picco PS full chisel non safety chain it will rip through the wood. That is what I have on my 026 now. Not easy to find those bars and rim drives in the US though. They sell them as a kit for the 261 in Europe (but not here).

 

[Black Dog Chainsaw]

029/290 carbs come with smaller jets than the 310/039/390 carbs. Better off with the larger jet 310/390 ones.

As for the OP, the Walbro 22C is second only to the Walbro 194 in quality/performance on the 026/260 line. Fully tuneable, and it will run it just fine. And if you want to make that 260 cut faster, put a Picco/low profile B&C and rim on it. With the new Stihl Picco PS full chisel non safety chain it will rip through the wood. That is what I have on my 026 now. Not easy to find those bars and rim drives in the US though. They sell them as a kit for the 261 in Europe (but not here).

I have a NOS 3/8LP bar in the shop hanging on the wall waiting on my 026pro with heated handles build. I bought it online by accident thinking it was 3/8 standard. Happy mistake!

As for the 290/390 jetting difference... meh.. they are still jetted bigger than the 194 and 22b/c. And either of the farmboss carbs are readily available AM or OEM. The question is if the AM 290/390 carbs are jetted to the 290 size or the 390 size??? They only make one for all three saws so which jetting did they go with?

 

[stihl saws]

The 194 is my favorite carb for these saws. My 260 had a wte 827 that I've never seen anyone mention.

 

[Black Dog Chainsaw]

870?? Haven't seen that one myself.

 

[huskihl]

I have a NOS 3/8LP bar in the shop hanging on the wall waiting on my 026pro with heated handles build. I bought it online by accident thinking it was 3/8 standard. Happy mistake!

As for the 290/390 jetting difference... meh.. they are still jetted bigger than the 194 and 22b/c. And either of the farmboss carbs are readily available AM or OEM. The question is if the AM 290/390 carbs are jetted to the 290 size or the 390 size??? They only make one for all three saws so which jetting did they go with?

Nathan, I have a couple 026, as well as an 039 carb. What is normally done to accommodate an air filter?

 

[Black Dog Chainsaw]

good question. I think some have machined velocity stacks and put a conical K&N or green foam filter on it. I think Treemonkey ran his ported one bare with no AF but it was a cookie cutter not a production saw. I think some of those modification threads are lost to the AS server problems. Other members that have done this mod can probably chime in. I just know what carbs will swap. Haven't had the time to try this myself yet.

 

[stihl saws]

870?? Haven't seen that one myself.

No. Just double checked. It's definitely a wte-827. Fully adjustable and had a high limiter.

 

[Windthrown]

I have a NOS 3/8LP bar in the shop hanging on the wall waiting on my 026pro with heated handles build. I bought it online by accident thinking it was 3/8 standard. Happy mistake!

As for the 290/390 jetting difference... meh.. they are still jetted bigger than the 194 and 22b/c. And either of the farmboss carbs are readily available AM or OEM. The question is if the AM 290/390 carbs are jetted to the 290 size or the 390 size??? They only make one for all three saws so which jetting did they go with?

I do not waste my time on aftermarket carbs, or much Chicom stuff on saws for that matter. So I cannot answer that question. All I was saying is that the 310/390 carbs are jetted bigger than the 029/290 carbs, and since you want to shoehorn in a larger carb, it would seem that the larger jetted carb would be the better choice of the 1127 series OEM carbs.

 

[Black Dog Chainsaw]

I do not waste my time on aftermarket carbs, or much Chicom stuff on saws for that matter. So I cannot answer that question. All I was saying is that the 310/390 carbs are jetted bigger than the 029/290 carbs, and since you want to shoehorn in a larger carb, it would seem that the larger jetted carb would be the better choice of the 1127 series OEM carbs.

That would depend on whether you are ported well enough to need the higher fuel and air volume.

 

[Windthrown]

That would depend on whether you are ported well enough to need the higher fuel and air volume.

Well, in either case I do not see why you would bother upgrading and messing around fitting a carb designed for a 55cc saw (the 029/290) vs. just keeping the stock 50cc 026 carbs. The idea here being that if you need more fuel and are going the larger carb route, you would be better off with the larger jetted 310/390 carbs. O/w you may as well stick with a Walbro 194.

 

[Terry Syd]

The 029-039 carbs are 16.67mm venturi. They are all jetted exactly the same - as an EPA carb. Take a look at the extra jet for the low speed circuit. It is a .25mm jet (standard EPA). Drill it out to .3mm to get some torque down low.

Another mod is to block the circuit joining the High and Low speed circuit. The low speed circuit gets its fuel from the main nozzle tunnel. Push out the nozzle and block off that tunnel, put the nozzle back in. That mod gives the carb more fuel/air ratio consistency. However, you have to drill an access hole from the wet side to just in front of the low speed needle so that you can tune the low speed flow.

Now the low speed circuit will flow well and develop some torque down low. Unfortunately, with the low speed circuit flowing at a higher rate, the high speed circuit will probably be running too rich. You will not be able to lean out the high speed needle - NO PROBLEM, block off the auxiliary high speed jet with a bit of GB Weld.

Tune and cut wood.

 

[drf256]

I ran an 044 carb yesterday in a very well done ported 026 by another member. Stock combustion chamber. Widened intake and exhaust. Widened transfers. Muff mod and 205 psi compression. Timing advanced.

I'd have to say, meh....

Didn't run much different rpm or have much power difference than one of the Chinese 194 carbs with the Venturi opened up .010.

The above saw now has its chamber cut flat and it's piston cut flat. The transfers will be raised today.

I will have nearly identically built saws for cutting by next weekend. One will have a 194 026 carb, and the other an 044 carb.

Not sure that the 044 carb is worth the PITA of nearly no choke. My point is that unless the engine is designed where it really needs the additional airflow, the bigger carb does very little.

 

[drf256]

Sent from my iPad using Tapatalk

 

[stihl_head1982]

Reading and observing.