MS200T Carburetor

[birdog]

My 200T has the Zama S126 carb (1129 120 0653) which has the accelerator pump (part #32 on the S126 page - 1129 120 9702) which from what I understand can cause problems. I see some people like to use JB weld to seal it off to eliminate the pump circuit but I can't find a video showing how exactly to do that. I noticed there are several carb options for the 200T. Looking at the parts diagram for the S32 and assuming I know what I'm looking at I believe carb S32 (1129 120 0650) does not have an accelerator pump. Would this carb work as a replacement for the S126?

If the S32 carb won't work then how easy is it to replace the accelerator pump circuit or simply eliminate it?

 

[Alan]

I’m not an expert by any means, but from what I’ve read, the S32 can work if the linkage, boot, and jetting are all in sync, though it’s not always a straightforward swap. Disabling the pump on the S126 is possible, but many find it easier to just swap the carbs if they check out. Hopefully, some experts here can share their experience.

 

[birdog]

Thanks Alan, I appreciate your incite on this. Just so I'm clear and to confirm the S32 is a non accelerator pump carb?

A quick check of the parts list shows only one complete handle option. Unless I'm missing something it appears all the different carburetors used on the 200T share a common handle including the linkages.

The accelerator pump carbs all share the same valve jet (1129 121 5406) however S32 uses a different valve jet (1129 121 5400). I'm assuming that's to compensate for the accelerator pump delete? The only thing I noticed that was possibly different was the rubber carb cover on the side of the handle and a grommet (1129 123 7504) that goes on the side of the carb.

Hopefully someone who has actually made this swap will chime in.

 

[Alan]

I really wish I could help more. Hopefully someone with hands-on experience or deeper knowledge will chime in. Fingers crossed!

 

[Paul]

If it can’t be cleaned and resealed you need a new one.
Make sure you check for air leaks first. Manifold, hoses etc.
go with OEM carb.
I had a cheapie on my 200, not good.

 

[Alan]

Thanks for jumping in. I really appreciate your advice and the reminder to stick with OEM it's super helpful.

 

[birdog]

Thanks Paul but my question is regarding the accelerator pump and how to delete it or if the S32 carb will work as a replacement for my current S126, if and when that time comes. I am aware that people will delete the accelerator pump prior to it failing. Kind of a preventative issue. My thought was if the S32 has no accelerator pump that will eventually fail then I may buy one for a spare, again assuming it is compatible.

I agree with you and I am an absolute advocate for OEM.

 

[HArborist2]

Sounds like you're on top of things, making sure everything plays nice together. Good move planning for check-ups now, it'll save you headaches later.

 

[birdog]

I have noticed from the research I have done on the 200T that a lot of guys delete the accelerator pump circuit because (A) it's not needed and (B) it fails.

 

[birdog]

Got some help from the arborist site.

https://arboristsite.com/threads/ms200t-carb-question.381932/#post-8518514

 

[Alan]

Glad you were able to get some help on that, and I hope it finally works out for you. Appreciate you sharing the link as well, it should help shed some light on that carb question.