Mastermind And The 562XP

[stihlonlynow]

OK I will be patient. I have been chatting with Mitch almost daily on this lately. And I appreciate all the work you guys have put into this.
Let me know what to try next.

 

[hamish]

Mitch, thanks for pulling the welsh plugs. Even after I pulled the plugs on the conventional C1M, I still couldn't figure out how the low speed circuit got its fuel. It turned out that there was a hidden passage. The reason it was hidden is that the insertion of the low speed jet during assembly blocked off one end of the passage and you couldn't see it. It was only when I found the outlet for the passage in the bottom of the well in the center of the carb that I figured it out.

I think you may find the same thing with the AT carb.

The jet you indicated looks to be only for the low speed circuit. There is probably another passage that feeds over to the main nozzle.

Here's something that sparked my interest. You mentioned some sort of device on the side of the carb that fed information to the computer about the 'position' of the throttle valve. Is this some sort of cam device? If so, perhaps the cam profile can be modified.

Its a simple two magnet system.

 

[boxygen]

Awesome work TK and Mitch, simply awesome work.

 

[mweba]

I think you may find the same thing with the AT carb.

Nothing hidden in this carb

The jet you indicated looks to be only for the low speed circuit. There is probably another passage that feeds over to the main nozzle.

The main nozzle passage flows straight across the top of the idle transition "jet"

Here's something that sparked my interest. You mentioned some sort of device on the side of the carb that fed information to the computer about the 'position' of the throttle valve. Is this some sort of cam device? If so, perhaps the cam profile can be modified.

It is a magnetic throttle position sensor. I have no reason to believe the input needs to be modified. If an older carb is swapped, the system works perfect. This seems to be isolated to the EL46. Tom should have it sorted in a couple days. He promised me a video..

 

[boxygen]

Let me know what to try next.

Try sending these guys each a bottle of Jack Daniels if you want to try something.

 

[boxygen]

Let me know what to try next.

Try sending these guys each a bottle of Jack Daniels if you want to try something.

 

[Terry Syd]

The idle/transition circuits on the conventional C1M and the AT work on different concepts. On the conventional carb the low speed needle limits the emulsified fuel mixture going out the idle hole. The AT carb doesn't have that circuit. The idle mixture can be set with the throttle cutaway - looks like you are on the right track.

Here's something to consider - the low speed jet may be a different size between the two carbs.

For example, if the low speed jet is bigger in the EL44, then there will be a bigger hit of fuel when the throttle plate moves past the transition holes.

 

[hamish]

The idle mixture can be set with the throttle cutaway - looks like you are on the right track.

Here's something to consider - the low speed jet may be a different size between the two carbs.

For example, if the low speed jet is bigger in the EL44, then there will be a bigger hit of fuel when the throttle plate moves past the transition holes.

Would a change in venturi diameter compensate for the jet size or butterfly. More thoughts bouncing inside the box.

 

[stihlonlynow]

Try sending these guys each a bottle of Jack Daniels if you want to try something.

I have been listening closely to one of these guys. He considered my saw a control to test their fixes.
Dont worry I am goimg to send him something. I just dont want to drive him to drink before he helps me fix my saw.

 

[TK]

My thoughts on this are an extremely simple problem. It is my belief that is a simple airflow problem. Not enough air, and not in the right places. Compounded with the nozzle problem, this creates a terrible issue. Replace the nozzle, you have a saw that runs and is usable. Won't stall but hesitates still. I honestly believe the rest of the problem lies in the transition circuit. The simplest fix (saw is loading up with fuel, too rich) seems to be modifying the throttle plate to allow more air to carry the fuel from the transitions. The plates have been modified, but opening a passage directly in line with the transitions seems to be working for me. I will have a run with the saw in the next couple of days, but I am fairly confident in this el46 repair. Sorry to be back and forth with which carb works best, Last weekend I just felt defeated after all the time I had into it with zero positive results. Some convo with mitch and laughing at randy this morning got me back on track. The el46 is back in the saw and the latest mods seem to be working......

and I'll make a video as promised. No guarantees anybody not from Maine will actually understand me....

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[TK]

Would a change in venturi diameter compensate for the jet size or butterfly. More thoughts bouncing inside the box.

I don't think the venturi will do anything for this problem. It may allow a higher performance in the long run but won't address the problem at hand. Just my opinion on the matter though.....

 

[hamish]

I don't think the venturi will do anything for this problem. It may allow a higher performance in the long run but won't address the problem at hand. Just my opinion on the matter though.....

But its airflow that draws from the nozzle. The C1M has many venturi diameters. Scratch it off the list, like other thoughts, methodically.
On these "affected" saws what are the run time hours like?

 

[stihlonlynow]

But its airflow that draws from the nozzle. The C1M has many venturi diameters. Scratch it off the list, like other thoughts, methodically.
On these "affected" saws what are the run time hours like?

5:28 on mine.

 

[hamish]

5:28 on mine.

Thanks Matt,

But as a control need some run times on affected non-modded saws.

 

[mweba]

Modded saws seem to be affected in greater numbers. Most likely due to the extra flow.

TK productions presents "I'm from Mayne, my speech is lost in translation"

 

[TK]

Thanks mitch, had a hard enough time making the vid and uploading it, getting the link to transfer here just wasnt happening.

That took an extreme amount of effort to speak clearly.

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[Mastermind]

Glad I'm good for a laugh.

 

[TK]

Glad I'm good for a laugh.

We love you randy. Don't say you didn't laugh at me

 

[stihlonlynow]

Thanks TK!! It was a great video!! I understood 100%.
Did you make the notch in the el46 throttle plate the same size as the other notches in it?

 

[TK]

Same-ish lol

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