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McCulloch Mini and Small CC Chainsaw's

Syncop8r

Syncop8r

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122
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New Zealand
I've often wondered if some sort of mod could be done to the case to enable carb removal without taking the engine out.
Probably not worth the effort.
 
Brushswamper523

Brushswamper523

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Dec 26, 2020
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39
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California
I am unsure is this a MDC 1 or is this a MDC 15. Any insight would be helpful. It is out a Mac 110. I just want to make sure I order the right one. It seems like MDC 1 kit doesn't fit any of the other MDC carbs. So I am hoping it is a MDC 15, carb kits are easier to get for me. Thanks fellas.
 

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MacAttack

MacAttack

I love the smell of 2-stroke
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974
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That looks like every Walbro MDC carb I've worked on, the usual rebuild kit would be the Walbro K1 (MDC) kit which would replace everything but the check valve under the welch plug.
 
gumneck

gumneck

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Finally received the K-1 MDC carb kit to the MiniMac 6. The gaskets, diaphragms are correct but the needle valve, welch plugs are wrong. So need to figure out which kit is correct. In the pic the screen on the left was underneath the tiny clip and screen on the right under the welch plug. I thought I've read there is a rubber check valve in there and maybe the screen on the left was rubber at one time.
 

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MacAttack

MacAttack

I love the smell of 2-stroke
Joined
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Messages
974
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Western NY
Finally received the K-1 MDC carb kit to the MiniMac 6. The gaskets, diaphragms are correct but the needle valve, welch plugs are wrong. So need to figure out which kit is correct. In the pic the screen on the left was underneath the tiny clip and screen on the right under the welch plug. I thought I've read there is a rubber check valve in there and maybe the screen on the left was rubber at one time.
Id be interested to see what others say, I got a K1-MDC Chinese made kit that the needle was too long and one welch plug the wrong size for the carb in my Mini Mac 25. The diaphragms and gaskets all seemed correct. Did you get a genuine Walbro kit or a ching chong chiner job like I did?
 
gumneck

gumneck

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Id be interested to see what others say, I got a K1-MDC Chinese made kit that the needle was too long and one welch plug the wrong size for the carb in my Mini Mac 25. The diaphragms and gaskets all seemed correct. Did you get a genuine Walbro kit or a ching chong chiner job like I did?
I thought I was just getting one kit but it ended up being 3 for $14.99. The valve is too long and one welch plug is too small. The larger welch plug on the carb is what I'm missing as well. The seller is in NJ but I suspect its not genuine Walbro kit. Would have been nice if it had the carb mounting gaskets I would say not a bad deal.
I'm afraid the only other kits I see that may have the correct plugs and needle valve is what Randy's Engine repair is advertising....$32 buckaroonies.... saw is barely pushing 20 bucks in value.
 
Mnmacguy

Mnmacguy

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Messages
44
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US
Finally received the K-1 MDC carb kit to the MiniMac 6. The gaskets, diaphragms are correct but the needle valve, welch plugs are wrong. So need to figure out which kit is correct. In the pic the screen on the left was underneath the tiny clip and screen on the right under the welch plug. I thought I've read there is a rubber check valve in there and maybe the screen on the left was rubber at one time.
On the 2 Mini Mac carbs I rebuilt I just put in gasket and diaphragm kits. They were aftermarket, Stens or Rotary I believe. They did the job. Ran good.

I did them a few years ago. If I was to do it today I would use genuine Walbro (Ebay $16) and put in a check valve kit too. Should also set the metering lever height and pressure test too. I've learned a lot of new things here over the years.

Sent from my SM-S367VL using Tapatalk
 
MacAttack

MacAttack

I love the smell of 2-stroke
Joined
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Messages
974
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I thought I was just getting one kit but it ended up being 3 for $14.99. The valve is too long and one welch plug is too small. The larger welch plug on the carb is what I'm missing as well. The seller is in NJ but I suspect its not genuine Walbro kit. Would have been nice if it had the carb mounting gaskets I would say not a bad deal.
I'm afraid the only other kits I see that may have the correct plugs and needle valve is what Randy's Engine repair is advertising....$32 buckaroonies.... saw is barely pushing 20 bucks in value.
That sounds exactly like the China kit I used regarding the welch plugs and needle. The issue I've run into is that my most recent Mini Mac still runs poorly after the carb kit and seems to need the check valve replaced as well.
 
Manic84

Manic84

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Joined
Nov 20, 2019
Messages
550
Location
USA
Finally received the K-1 MDC carb kit to the MiniMac 6. The gaskets, diaphragms are correct but the needle valve, welch plugs are wrong. So need to figure out which kit is correct. In the pic the screen on the left was underneath the tiny clip and screen on the right under the welch plug. I thought I've read there is a rubber check valve in there and maybe the screen on the left was rubber at one time.
I thought I was just getting one kit but it ended up being 3 for $14.99. The valve is too long and one welch plug is too small. The larger welch plug on the carb is what I'm missing as well. The seller is in NJ but I suspect its not genuine Walbro kit. Would have been nice if it had the carb mounting gaskets I would say not a bad deal.
I'm afraid the only other kits I see that may have the correct plugs and needle valve is what Randy's Engine repair is advertising....$32 buckaroonies.... saw is barely pushing 20 bucks in value.

Those chinese kits never have it right, the weak point is always the needle, so only the gaskets seem to be worth anything. And that check valve and screen... wow. Did you pull the brass retainer out or were you able to just fish out the valve? Does the rest of the saw check out? (spark, compression, no air leaks etc.)

I very much believe that these saws are very easy, and don't need much to get back up and running.
Most of the time all these saws really need is: fuel line, the check valve, the welch plug and the diaphragms and gaskets-- that's really it. I don't see many people removing the 1/2 plug. They usually just shoot carb spray down the low needle to flush out anything stuck in there. You already have the gaskets, so cut the cost and just reuse the original needle. A lot times you really don't need to replace it as long as the tip isn't deformed and it's still flexible. Now if the needle is completely shot, then you'll have to get the Walbro kit since no aftermarket one really seems to get the needle right.
 
heimannm

heimannm

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Dec 28, 2005
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10,346
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Dike, Iowa
Someone please post a photo of the MDC needle with a ruler beside it to provide some scale. I have been going through parts and have a few spare needles squirreled away, some may be correct for the MDC.

Mark
 
gumneck

gumneck

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chesapeake,va
I need to see what makes up the check valve parts. I pulled the small retainer out after removing both welch plugs. BTW, the spring loaded center punch trick didn't work on these. I suspect never being removed and the number of years since its been in service made it more difficult.
So check valve parts and welch plugs Is what I need. The valve looks ok but I'd rather replace while its out. I'll make up some carb mounting gaskets.
 
Manic84

Manic84

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550
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Someone please post a photo of the MDC needle with a ruler beside it to provide some scale. I have been going through parts and have a few spare needles squirreled away, some may be correct for the MDC.

Mark
Will this work Mark?
 

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Manic84

Manic84

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This was about the only window of time in the past 2 years that I didn't have an MDC needle handy, because I'm trying to finally get my old Canadien running....then the MM 25 is getting torn apart again to replace the check valve.
I hope you get them both running!

This was the perfect excuse I needed to take a mini apart to confirm something about the MDC carbs that had been bugging me.
The needle was already out so I figured why not?
I've been experimenting trying to figure out a separate two test short cut for the MDC which should work for the M1-M7s too since I think that the circuits are similar. I'll post my findings in time, but I have the feeling that it'll work.
 
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