Just some Mac info about your saw. You can also get some info in the chainsaw stickies section about Mac's. A guy by the name of heimannam has good info about mac's. When he talks to you, listen up.
The points should be gapped at .018-.020. The condenser is .18-.22UF
The coil primary should be in vicinity of .025 ohms-1.5 ohms on the primary and 3.5-7.2K ohms on the secondary. Most generally when they are not firing the points are the problem. Make sure the kill switch is not on all time. You can remove it's wire to see if you then get fire. Coil air gap is .008-.012. (typically .010)Mac made a special tool at one time for setting the timing by the points gap, but it's not necessary and NLA. If the points are not making contact on you tester 1st try just dragging a clean white paper through them while they are closed and then re-test contact. If not go try a points file but filing old points is in the same category as peeing into the wind. I've found new points by doing a saved search on flea bay very reasonable, like $8-10.
You can test the condenser using a DMM. Condensers are kinda pricy. You can find some parts or reference to interchangeable parts a chainswyer.com. Watch out for the word KART engine and vintage. They use these words to jack up the price.
You can find a carb kit for around $15 and you can use a RK88HL kit on that 87D carb. Watch out and try to save the little cork gasket (leave it in place) when you remove the bottom metal because most generally the new kits have the wrong size cork gasket. Also be careful with the sintered iron carb filter and it needs cleaned with air pressure. They clog and you cannot see such by eyeball.(close but not cigar) No need in flogging the carb until you get it firing. After getting fire you should prime into the carb throat and get a promise to run by ties the throttle wide open. They always like to start with full throttle. (it's their nature for such) They need good compression to get a run promise, at very least 125 and up, 150 is good and checked with a reliable small engine comp tester, not a auto tester. You will probably have to replace the fuel line and the little clamp on the carb barb needs to be replaced with a small clamp that can be tightened. If you are seeing any gas in the air box when testing you have a fuel leak and she won't go good.
That 87D carb can be replaced with a Tillotson HL63D, E or A, direct fit no mods required..
The 63 carb has a spring loaded choke butterfly (spring loaded open) and yours don't have the choke butterfly. The HL63 uses the same RK88HL kit.
I've bought both carbs on flea bay for around $15-20.
I have some tips for starting them saws when they are cold that saves lots of cranking, blistered fingers and sore shoulders.
Them old heavy saws were not made for Nancy's and Pansies to operate.
Here is some carb info. GOOD LUCK TO YOU.
Some of them saws also came out with a carb made by Mac and some had one termed Bullfrog carb. You do not want those carbs. Make sure the gas tank is clean and the in tank filter is good.
McCulloch chainsaw carbs types
If you are asking about Carbs for the old Mac saws here is what I've used and will interchange, from my Mac notes.
The Tillotson HL63D, E, and A can be used interchangeable and use same kit (RK88HL)and can also be used in place of the 87D, but the 87 D cannot be used to replace the 63A, D, E,
because the 87D does not have a choke butterfly inside the carb. (the choke assembly for the 87D carb is made on the saw air box)
And these Tillotson carbs can be used to replace the carbs that were made by McCulloch but a throttle linkage kit will be needed.
I seen some mod carb kits at chainsawyr.com every once in awhile for the old 1-40, 1-50, 250 series of Mac saws.
The 1-40, 1-50 series of Mac's came out with approx 3 different types of carb's during their production, a HL87D, HL63A, D, and E and a carb made by McCulloch and I think
I’ve heard of some Mac 250’s that use a Tillotson HL63F carb which uses a RK106 kit.
maybe one type of carb referred to as a Bullfrog carb.(it's bottom looks like a bullfrog belly)The Tillotson carbs will bolt up and replace the Mac, bullfrog and flat back carbs with correct linkages.
The Tillotson carbs are user friendly to repair and service info and parts lists readily available at the Tillotson website, look at HL series carb.
The kit for the Tillotson is a RK-88HL at about $10 from flea bay