as usual my work hours are a secret so i get the changes almost after the fact.
today instead of 9 am i was put to 8 pm and will be on till 5 am. then back at 10 am .
point being i was stuck with nothing to do today.
so i worked on gathering up all the new goodies for the mc49 project that took about forever.
i'm running out of seals so i tried for a long time to find my engine sheet.
since i'd asked where to buy questions before i dragged the forum search to find the numbers again.
so this is parts from a few old posts i just cobbled together to order more seals and bearing.
by putting it under the heading bearings and seals mcculloch i'll be able to find it next time.
when i get to the main ball bearings and rollers i'll edit them in.
i think the ball bearings are 6703 off my memory but that could be wrong.
in my usual backwards way i found this source for mcculloch engine seals.
when i was looking for axle bearings.
they seem to be really cheap for all the seals and bearings.
below is good needle bearings for the mcculloch pistons open are for most pistons on the non exhaust side .
the closed ones are used for early pistons and there are different ones for some mc101 series.
Open-open "full complement, uncaged needle bearing" Koyo # B-87
Closed-open" full compliment, uncaged needle bearing" Koyo M871
heres a ebatmus order i'm making.as you can see the prices are pretty reasonable.
KOYO CORP. B-87 NEEDLE BEARING B87 0 LB $3.51 ×10 = $35.10
SKF/CR SEALS 6763 SEAL .688X1.188X.188 $3.67 ×20 = $73.40
SKF/CR SEALS 7414 SEAL .750X1.124X.188 $4.93 ×20 = $98.60
SKF/CR SEALS 6816 SEAL .688X1.375X.313 $4.13 ×10 = $41.30
Your crank bearing is a 203 variant. Depending on what brand as to which prefix is used. 6203 with what ever suffix happens to be the most plentiful price considering, either open, sealed or shielded. Not any trouble to pop the shields off if they are cheaper than open style. I have been buying them for around $2 each when available from different vendors or even in bulk on ebay. Just had 20 of them show up last week.
6203ZZ, 62032RS very common normally stocked numbers and many more. Usually very inexpensive. Other variants that are same include 203K, 203KD 203KDD 203P 203PP. Different suffixes relate to open, sealed or shielded one side or both combination blah blah blah. These will all be a standard C3 bearing. Most Itailan and Jap motors use a C4 bearing specifically clearanced for a two stroke motor. These older Macs dont require the radial tolerances of these. If they were a currently produced motor that was raced to the edge, a retainer of some exotic polymer that can withstand the high rpms these motors could potentially be running may be worthy of use.
Caged pto bearing is a J-1210 in Torrington or any other manufacturer using the same numbering system. These are usually less than $5 at most places.
The J prefix signifies caged needles. The B prefix is for loose needles(full compliment). McCulloch went to caged around 1962.