Which Carb Kit for 201T M-tronic w/ZAMA C1Q-S274 Carb?

[PogoInTheWoods]

Haven't found a good answer so far. No ZAMA cross-ref since it's a 'Stihl' carb. Stihl's part number for a gasket set doesn't show as a good number. Looks like a fairly common C1Q carb to me, though I have read that the metering diaphragm center stub is an odd length making it a rather proprietary item. Not even going to start experimenting with metering lever heights and a 'maybe it'll work' diaphragm. Just want a GND kit that's known to work with these carbs.

TIA for any help.

 

[PA Dan]

Haven't found a good answer so far. No ZAMA cross-ref since it's a 'Stihl' carb. Stihl's part number for a gasket set doesn't show as a good number. Looks like a fairly common C1Q carb to me, though I have read that the metering diaphragm center stub is an odd length making it a rather proprietary item. Not even going to start experimenting with metering lever heights and a 'maybe it'll work' diaphragm. Just want a GND kit that's known to work with these carbs.

TIA for any help.

I believe its the RB69 kit. Same kit for the mtron and manual carb.

 

[PogoInTheWoods]

Thanks for the response. I do show the same Stihl part number (1145 007 1700) for both types of 201 carbs. The RB-69 cross-refs to 1129-007-1062 for 200T C1Q's. Diaphragms appear the same. A little more research comes up with a few other possibilities, none of which are readily available domestically but can be had in Europe. That said, I'm now told that the Stihl 1145-007-1700 kit is indeed available, just not included in the static Specialty Tools, Spare Parts, and Sprocket List price catalog. Would sure be nice if a plain old common GND could be identified to work for 6 bux instead. The GND-39 looks right except it has a Teflon pump diaphragm when an acetate diaphragm is called for.

 

[PA Dan]

Thanks for the response. I do show the same Stihl part number (1145 007 1700) for both types of 201 carbs. The RB-69 cross-refs to 1129-007-1062 for 200T C1Q's. Diaphragms appear the same. A little more research comes up with a few other possibilities, none of which are readily available domestically but can be had in Europe. That said, I'm now told that the Stihl 1145-007-1700 kit is indeed available, just not included in the static Specialty Tools, Spare Parts, and Sprocket List price catalog. Would sure be nice if a plain old common GND could be identified to work for 6 bux instead. The GND-39 looks right except it has a Teflon pump diaphragm when an acetate diaphragm is called for.

Your welcome! I have rebuilt 5 or 6 201t carbs all manual adjust and used the RB69 kit in them.

 

[PogoInTheWoods]

Do the metering components (lever, spring, needle) interchange also?

 

[PogoInTheWoods]

Looks like any C1Q-S kit with the common pump diaphragm and five/six hole metering diaphragm will work for diaphragms. No idea on the other metering components. It seems like Stihl has just re-numbered existing kits for proprietary purposes instead of referencing commonly available kits. The RB-69 and GND-33/39 variants look like the ticket with the GND-33 having the black pump diaphragm while the GND-39 has the tan one..., though I've also seen it the other way around in the handful of pictures I compared today. Also of note was some metering diaphragms lacked the offset fifth hole with some kits. Gotta have it for the pulse passage.

I happened to have a black pump diaphragm and gasket and a new metering diaphragm and gasket in my stash. Metering stub was identical and I'm good to go. So much for the proprietary theory there.

FWIW, the metering diaphragm part number I came up with is ZAMA A015011 / Oregon 49-920. Couldn't find a good gasket number. The pump diaphragm and gasket from the Zama IPL are 0015050 and 0016033 respectively for anyone interested. Basically cheaper to buy the whole kit.

 

[PogoInTheWoods]

The diaphragms worked fine. Muffler mod with a timing advance and this saw surprised the sh!t outta me. First 201 I've done. I did a ECM field "reset" which is the 9o seconds with no bar and chain then shut down to clear out the learned settings and establish a baseline with the new solenoid before doing the full reset with bar and chain. It barely got through it before settling into a nice smooth high idle. Thought I may have screwed it up with too much advance, but it finally adjusted to it -- which is to say retarded accordingly for low speed/idle. It blew me away after I went through the whole routine with bar and chain and 5 consecutive cuts buried in red oak. Pretty amazing transformation and an impressive little saw now.

 

[PA Dan]

The diaphragms worked fine. Muffler mod with a timing advance and this saw surprised the sh!t outta me. First 201 I've done. I did a ECM field "reset" which is the 9o seconds with no bar and chain then shut down to clear out the learned settings and establish a baseline with the new solenoid before doing the full reset with bar and chain. It barely got through it before settling into a nice smooth high idle. Thought I may have screwed it up with too much advance, but it finally adjusted to it -- which is to say retarded accordingly for low speed/idle. It blew me away after I went through the whole routine with bar and chain and 5 consecutive cuts buried in red oak. Pretty amazing transformation and an impressive little saw now.

Heck ya buddy![emoji106]