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Almost dead 200T carburettor

Lone Wolf

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I gotta love the dark pink carpet you've got there in yer workshop buddy! And do I spy a notes pad with a pen at the top right of the pic?? Nice and organised.....

:thumbup:
That's a towel Matt, organization is key.
 

MattG

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That's a towel Matt, organization is key.
Ha! Yeah, I know what you're saying. I'm forever having to clear up my workbench. Because my dayjob is in a smart computer job office, I periodically grab a bunch of old newspapers and take them home and whenever I need a clean surface in a hurry, I just sit a fresh sheet of newspaper down on the bench. Kinda works for a while til it gets covered in cr@p and then you've got to start all over.
 

Lone Wolf

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Ha! Yeah, I know what you're saying. I'm forever having to clear up my workbench. Because my dayjob is in a smart computer job office, I periodically grab a bunch of old newspapers and take them home and whenever I need a clean surface in a hurry, I just sit a fresh sheet of newspaper down on the bench. Kinda works for a while til it gets covered in cr@p and then you've got to start all over.
:borra2:
 

Wood Doctor

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Ha! Yeah, I know what you're saying. I'm forever having to clear up my workbench. Because my daytime job is in a smart computer job office, I periodically grab a bunch of old newspapers and take them home and whenever I need a clean surface in a hurry, I just sit a fresh sheet of newspaper down on the bench. Kinda works for a while til it gets covered in cr@p and then you've got to start all over.
You can also use those newspapers (or the old ones on the becnh) to start your wood burning stove in the morning. That's what I do. Just wrap them around a few small kindling sticks and light them with a match. Fabulous stove lighters.

Let's see. We were talking about Stihl 200T chain saws having trouble. The one on my bench is still down. Getting to the impulse hose is a real PITA. Half the saw has to be taken down, including the dreaded top handle that's packed with complexity. It's even worse than the 025 and a few other Stihl saws.
 

Lone Wolf

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You can also use those newspapers (or the old ones on the becnh) to start your wood burning stove in the morning. That's what I do. Just wrap them around a few small kindling sticks and light them with a match. Fabulous stove lighters.

Let's see. We were talking about Stihl 200T chain saws having trouble. The one on my bench is still down. Getting to the impulse hose is a real PITA. Half the saw has to be taken down, including the dreaded top handle that's packed with complexity. It's even worse than the 025 and a few other Stihl saws.
What are you trying to do pull the whole impulse off or just check it?
 

MattG

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You can also use those newspapers (or the old ones on the becnh) to start your wood burning stove in the morning. That's what I do. Just wrap them around a few small kindling sticks and light them with a match. Fabulous stove lighters.

Let's see. We were talking about Stihl 200T chain saws having trouble. The one on my bench is still down. Getting to the impulse hose is a real PITA. Half the saw has to be taken down, including the dreaded top handle that's packed with complexity. It's even worse than the 025 and a few other Stihl saws.
With 200Ts I've found that you can short cut a few enquiries by removing 3 AV mount screws. The first is at the back of saw just from where the tuning screws adjust grommet, the second is at the front where the switch side of the TH joins the top of the engine case, and the third is at the front bottom where the side loop thing joins. When they are out you do get a lot more wiggle room.

You can then strip off the A/F cover and petrol tubes, and lift the back of the TH. Then it's just the intake boot holding everything together (so just don't overstrain this part); below is where the impulse line plugs to the underside of TH. Pull off with forceps and get a gauge on the end of it, and rotate the crank - presumably you'll get some readings if that's intact. If the gauge doesn't move at all, then as Wolfie speculated earlier p'haps yer impulse is loose or perished etc.

Have you checked if the carb is a S126A or B, with an acc pump? Those ones have got a cross head for the H screw, and a slot head for the L. Ones without acc pump with have a slot head for both screws.

(For not disturbing the bo!!ocks in the TH: remove the orange master switch first, then just loosen off the 3 T20s screws, don't remove them yet; pry out the side of the TH cover, maintaining pressure on the top orange interlock thing pushing the rods back into the body of the TH, then you can slowly work the cover off with all the roddy things in situ).
 
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Lone Wolf

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You can also use those newspapers (or the old ones on the becnh) to start your wood burning stove in the morning. That's what I do. Just wrap them around a few small kindling sticks and light them with a match. Fabulous stove lighters.

Let's see. We were talking about Stihl 200T chain saws having trouble. The one on my bench is still down. Getting to the impulse hose is a real PITA. Half the saw has to be taken down, including the dreaded top handle that's packed with complexity. It's even worse than the 025 and a few other Stihl saws.
Not nearly as bad as the old 020AVP I just fixed. You have to pull most of the saw apart just to clean the carb!
 

MattG

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So the zama S126B now with impulse outer drilled through to inner chamber, ran it up yesterday, put a tank of fuel through it and a tune. Works very nice now, in all aspects. :)

My next carb I wanna repair is this one is a china copy of a S32 (ms200T). It starts and runs WOT ok, but everything in between is rubbish.

I see that a genuine S32 has 2 cutaways on its throttle plate:

stih2.jpg
however the china copy does not have these cutaways:

2018-01-11 16.58.55.jpg
so I'm planning to fill similarly sized and appropriately positioned cutaways on the chinese bad boy, and then retest it.
 

Lone Wolf

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So the zama S126B now with impulse outer drilled through to inner chamber, ran it up yesterday, put a tank of fuel through it and a tune. Works very nice now, in all aspects. :)

My next carb I wanna repair is this one is a china copy of a S32 (ms200T). It starts and runs WOT ok, but everything in between is rubbish.
Or switch the plates and try it before you file.
I see that a genuine S32 has 2 cutaways on its throttle plate:

View attachment 106260
however the china copy does not have these cutaways:

View attachment 106261
so I'm planning to fill similarly sized and appropriately positioned cutaways on the chinese bad boy, and then retest it.
 

Simondo

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So the zama S126B now with impulse outer drilled through to inner chamber, ran it up yesterday, put a tank of fuel through it and a tune. Works very nice now, in all aspects. :)

My next carb I wanna repair is this one is a china copy of a S32 (ms200T). It starts and runs WOT ok, but everything in between is rubbish.

I see that a genuine S32 has 2 cutaways on its throttle plate:

View attachment 106260
however the china copy does not have these cutaways:

View attachment 106261
so I'm planning to fill similarly sized and appropriately positioned cutaways on the chinese bad boy, and then retest it.
Are there " holes" drilled in the carb to match the cut "outs " you are intending to file ? or just 1 hole/set of holes ?
 

MattG

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Are there " holes" drilled in the carb to match the cut "outs " you are intending to file ? or just 1 hole/set of holes ?
Hi Simon,

The cutout at about 12o'clock on the zama does have a single holes slightly downstream in the flow. If you now eyeball the copy you should able to see a similar hole at ~11o'clock but no corresponding cutout, so I'm planning to file out something similar at about 11o'clock on the copy's plate.

At 6o'clock there's a bigger cutout on the zama, I forget what this lines with exactly. I was in a hurry this evening......and anyway I'll probably take a few days chewing over how to attack the problem first. I'll try to take a better look at things tomorrow.....but any advice in the meantime would be great.
 

Wonkydonkey

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My 126a cheapclinkycopy carb never had a cutout in the butter-flap. So I flopped it out an pushed it over a bit of angry cloth. But I think the angry cloth was a bit more angry than I thought, cos it took more of than I wanted.

I have not tested it yet, but your carb Matt gives me hope, I recon my one file away is equal to your two cut outs. ;):)
 

MattG

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My 126a cheapclinkycopy carb never had a cutout in the butter-flap. So I flopped it out an pushed it over a bit of angry cloth. But I think the angry cloth was a bit more angry than I thought, cos it took more of than I wanted.

I have not tested it yet, but your carb Matt gives me hope, I recon my one file away is equal to your two cut outs. ;):)
I'll let you know...
 

Simondo

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Hi Simon,

The cutout at about 12o'clock on the zama does have a single holes slightly downstream in the flow. If you now eyeball the copy you should able to see a similar hole at ~11o'clock but no corresponding cutout, so I'm planning to file out something similar at about 11o'clock on the copy's plate.

At 6o'clock there's a bigger cutout on the zama, I forget what this lines with exactly. I was in a hurry this evening......and anyway I'll probably take a few days chewing over how to attack the problem first. I'll try to take a better look at things tomorrow.....but any advice in the meantime would be great.
Im just thinking ....1 cut out filed, where there is a hole--set of holes only. I personally like to be able to keep a reverse default position (same as your I T stuff i guess) so i only change 1 thing at a time ...unless.. its tried and tested before. Have a study of this pic ......its from a Zama tech manual. Cut out/outs are not mentioned ...interesting don't you think.

Screen Shot 2018-01-11 at 23.19.50.png
 
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MattG

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I personally like to be able to keep a reverse default position (same as your I T stuff i guess) so i only change 1 thing at a time

Yeah, thanks for reminding me! That is the approach I take with PC work: lots of small testable changes if possible.

Definitely need to apply that rationale right now....anyway I'm parking this job for a couple of days....I've got someone's ms231 to look at right now... it probably has to take priority over my little project plays... :(

Oh, and thanks for the literature!
 

Wood Doctor

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Impulse line off or loose?
It was none of the above, as they say. I removed the carb and checked the diaphragms and the strainer. All looked OK. With my head shaking, I decided to try my age-old dirt cheap carb fix trick. Using an empty jar, I soaked the entire carb, submerged for 48 hours in mixed fuel, lid on jar.

Then I simply reinstalled the carb (always a challenge), added fresh fuel, and adjusted all setscrew settings to MFG recommended. The engine now starts and runs perfectly. Case dismissed.
 
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Lone Wolf

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It was none of the above, as they say. I removed the carb and checked the diaphragms and the strainer. All looked OK. With my head shaking, I decided to try my age-old dirt cheap carb fix trick. Using an empty jar, I soaked the entire carb, submerged for 48 hours in mixed fuel, lid on jar.

Then I simply reinstalled the carb (always a challenge), added fresh fuel, and adjusted all setscrew settings to MFG recommended. The engine now starts and runs perfectly. Case dismissed.
Where are you having trouble putting the carb back on?
 
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