101 Flywheel

Bob Towarnicki · Post by **Bob Towarnicki** » Fri Mar 07, 2008 9:07 am

Question - The Mc101 IPLs list a different flywheel number than the 5 degree wheels used on the 9x series motors. What is the 101 advance and should or can I use a 5 degree flywheel? Thanks in advance for the help.
Bob

Rob Voska · Post by **Rob Voska** » Fri Mar 07, 2008 1:53 pm

I usually run a 2 deg on 101's. I think they cane stock that way.

steveohara · Post by **steveohara** » Fri Mar 07, 2008 11:31 pm

Bob,

Your 101 will run better with the 5 degree flywheel than with the OEM version.

Rob.... what is the part # for a 2 degree flywheel? I have heard people say they have a 2 degree flywheel but I have never seen one on 40 years of working on Mac engines. Have you ever put the "2 degree" flywheel on a fixture to actually check the relationship between the magnets and the key? What identifying marks distinguish the "2 degree" flywheel from the others?
Thanks
Steve O'Hara

Rob Voska · Post by **Rob Voska** » Sat Mar 08, 2008 8:00 am

I can take my bucket-O flywheels and stack them one on top of the other and use a 12" piece of key stock to align the keyways. Then I look at the magnet location. I have 3 flywheel choices. Regular Chain Saw, 5deg, and one in between.........

Post by **Jeff Campbell** » Sat Mar 08, 2008 3:09 pm

This shows the difference between the 68281 (std) and 68280 (5deg) flywheels.... scroll to bottom of document...

http://rearenginekarts.com/McCulloch%20 ... 0Specs.PDF

I run the 68280 5 degree wheels on all my MC101 motors. Also, it is very easy to file off some of the woodruff key to advance the magnets on a standard flywheel, lap the flywheel well onto the crankshaft and be careful to position it properly when tightening it.

Jeff

Gordon Duax · Post by **Gordon Duax** » Sat Mar 08, 2008 4:02 pm

I used to set a crank in the vise, through a degree wheel.
No mater what they were suposed to be..........
they all varied 2-3 degrees.
Even the ones marked 5 deg.
They would be between 3-7 degree.

So check your flywheels.........

Post by **Jeff Campbell** » Sun Mar 09, 2008 9:01 am

...also, just the slop in the key fit is enough to allow the flywheel to crank relation to vary a lot (if I remember right, I think there is about 1 degree of slop in there or more).

Jeff

Bob Towarnicki · Post by **Bob Towarnicki** » Sat Mar 15, 2008 11:36 pm

Thanks everyone for the replys. Now another question. I am new to 101s and it seems like the threads on the 101 crank on the flywheel side do not come fully out of the flywheel, leaving very little to catch when using a starter pully. The flywheel is fully seated on the taper. Is there a trick I am missing or is the reduced thread engagement sufficient. I would hate to send a flywheel flying! Thanks again.
Bob

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