As far as i know the engines in the mc line were built with the usual manufacturer laziness. Ie: if the part works use it next year.
i've found through a simple number research project that the parts numbers interchangeability of mc 5-91 parts is very good.Asking you guys specific questions has filled in the picture.
Several of us "newbe's" are trying to build mc5 5/6 and 6 motors.
first the flywheel.i'd like to confirm that any 91 series flywheel will work.
true/ false?why
The shroud is different from the later models and i'd like to ask the guys that know to answer some questions.
What we know or think we know:
1. The shroud is different
2.the head was installed with the plug facing the pto side.
true/ false? why?
a.i've been told that the mc 5 5/6 and 6 heads were flipped 180 degrees in later years to protect the spark plugs from chain whip when a chain let go.
true/ false?
b.i've also heard they were flipped because the coil wire on replacement coils was shorter.
true/ false?
c.the likely one that i was told is on the chainsaws people were getting rapped by wet plug wires so mcculloch relocated the plug away from the hand area to stop this , kart motors were changed too.
true/ false?
3. we've been told the shroud is bigger, smaller ect. ect.
my research indicates that the shroud is the same but was modified in later years (a cut out was added) to accommodate the reversed plug direction and taller block.
true/ false? why?
4.the 91 fan and head shroud fit without modification.i know this can be true as i have one that way .
true/ false? why?
5.does filling the opening in the head shroud (with some sort of epoxy) make it look/pass as a mc5 shroud?
true/ false?why
6.Also, can someone please, please ,please post some really good pictures so we can actually see a mc5 shroud.(maybe Ed?)
like i said any help is really great.
thanx dave
