Carb Settings MS460 Mag

[Steck]

Hey guys. I’m throwing a new walbro HD16 on the 460. I always start with 1 turn out on high and low. I always get the high setting right because I have a tack. Where do you guys start the idle adjustment screw to start? I think that is what has gotten me screwed up in the past in setting the low. My stock carb came with a .68 main in it, so I will verify that’s what the replacement has in it. Also, I opened up the muffler and have a maxflow air cleaner set up on it. Are there better air filter options out there and if you have a similar set up, what main jet are you running.

 

[FederalQ]

 

[FederalQ]

I‘m running a .76 in mine with an open dual port muffler. From what I‘ve learned the .68 was for USA emission regulations. The 046‘s apparently had a larger main jet.

 

[huskihl]

I‘m running a .76 in mine with an open dual port muffler. From what I‘ve learned the .68 was for USA emission regulations. The 046‘s apparently had a larger main jet.View attachment 471153

Doesn’t really matter as long as the adjustable jet adds plenty of fuel in addition to the replaceable fixed yet. Only difference between .68 and .76 is about 1/8 of a turn

 

[Steck]

Ok thanks guys. I have been able to get the fuel I need on the high side in the past without a ridiculous amount past 1 turn. When I get the new one, I will verify the main jet size. Hopefully it’s the same but it’s a quick swap if not. Now to open up the 076 super to see what’s wrong. Think it needs a coil

 

[SawAddictedFarmer]

Where do you guys start the idle adjustment screw to start? I think that is what has gotten me screwed up in the past in setting the low.

I would just do it in plenty far and then turn it down when it starts. The low just turn the idle in screw until the chain starts creeping and adjust the low for fastest chain speed, and then back of just a hair, then you can turn down the idle.

 

[Steck]

Got the new carb today. After removing the limiter caps and verifying the .68 jet, I set low on 1 out and high on 1 1/2 out. And that’s where she stayed. Wow! The old carb was rebuilt before but the saw never ran like this. It popped on the first pull on choke and ran on second with no choke. Throttle response is great. Just had to turn up the idle from where the factory setting was at almost fully closed. This thing never idled well, and would load up and smoke on me. It also would take 10 pulls to start it. No smoke and no loading up at idle now. The new carb made all the difference. In all, I should probably have a bigger main jet in it but I’m ok with 1.5 turns out. Any more than that and I’d look for a bigger main.

 

[cuinrearview]

Any more than that and I’d look for a bigger main.

Why?

 

[FederalQ]

The larger jet may allow you to tune without having to defeat limiter caps.

 

[cuinrearview]

The larger jet may allow you to tune without having to defeat limiter caps.

Can you go "one and a half turns out" with the limiter on?

 

[huskihl]

Some carburetors are like that. Older saws were set closer to 1 and 1 for years but many of the newer ones aren’t. I just ported a 543 XP and the carb was at 2 and 2. Some echos are 3.5 turns out. If it still puts out plenty of fuel by turning it out further, it’s a non issue