OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Trimmers and Brushcutters McCulloch Trimmers & Brushcutters McCulloch "Mac 100HD" brushcutter

Hi,

New to the forum and have an old Mac 100HD 2 stroke petrol trimmer with the following issues:

- oily black ooze covering most of the motor. Have torn it down and think that it is coming from and leaking from the exhaust port. The port also has lots of carbon black soot buildup. As to why there is the black oily ooze I am assuming that I am mixing too much oil in with the fuel?
- in taking it apart, both the exhaust gasket and carby gaskets on the other side have rotted away and fuel hoses no longer look healthy. I think this machine would be nearly 20 years old now.

I have bought a new Stihl machine but have decided to make this old Mac my project, given that it looks like some parts are still available.

Despite all of the above, the old thing has always been a keen starter and runs fairly well. However once warm and after a few minutes of work now, the motor starts to die like there is a fuel delivery problem, only to recover a few seconds later. There is no rough running or sputtering, just a drop in revs and power and then a recovery.

So given all of this, I plan to clean the intake and exhaust ports, put new gaskets,filters and a carby kit thru her and new fuel lines. The carby is a Walbro WT 211.

Can anyone assist with parts and also possible causes of the symptoms above? Also, any other suggestions for the rebuild?

Thanks,

Bootross,

You can still get a few of the McCulloch parts.

Carby kits area available and some of the gaskets. I can upload the parts list for the Mac 100HD trimmer if you want to the parts list and manuals area of this forum.

Thanks Bruce, if you could load the manuals I will get them and get started. I've donated to the site to get access too.

Bruce, sent you a message re getting the parts list and manual for this machine.

Thanks,

I will be scanning the manual today and uploading it, so check later on this afternoon.

Thanks Bruce,

Have had a look thru.

Need the following parts if you have them:

Engine Assembly page:
Item No: 76 - cylinder gasket.
26 - muffler gasket
15 - carby gasket spacer
13 - carby gasket insulator
43 & 45 - fuel hoses
44 - fuel pickup and filter

Carby Assembly page:

Basically need a carby kit. Mine is stamped WT 211 so all matches up. The "Gasket Diaphram kit" described at the bottom of this page looks like it will do the job.

Also need item no. 4 primer pump bulb.

Let me know what you have available.

Thanks again,

bootross,

What I have located so far is:

215515 Gasket, muffler #26
223986 Gasket, shield insulator #15
222238 hose #43
217382 hose #45
216985 fuel filter #44
WT Carby Kit
223077 Primer Bulb

Waiting to find out about the cylinder gasket.

Thanks, I will take the lot. Do I just ring the shop with a credit card to pay for it all?

bruce you can check my forum i updated part #s on there see if the part #s you need is on there thanks

Have stripped it down. Geez it's a year since I first posted!

Anyway, the black oily ooze I was talking about originally, looks like it's coming from behind the flywheel, so I am guessing the crankshaft oil seal is leaking?

I have chased the McCulloch part no. as 83859. Is this available to order through this forum?

bootross,

You should be able to get the seal from a bearing supplier like CBC bearings just give them the measurements.