400 cc hysterical engine

Started by dirtbike, November 24, 2010, 11:55:13 AM

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dirtbike

#15
November 30, 2010, 05:28:29 PM
Oh, learned something today as well. I have never ever seen or even heard of a flywheel like that. Now, some suggestions makes sense.

SouthRider

#16
November 30, 2010, 07:56:06 PM
You have what we used to call the "small motoplat" (or small external motoplat).

The internal rotor model we just called the internal motoplat.

The ones in the photos from ebay are "large motoplats".

Keep in mind - I haven't seen one of these in 35 years - but the top one looks like it is from a 400 Penton Enduro model, and the bottom one reminds me of the "large motplat" from a Husky.

Be careful what you buy - Husky had 2 different crankshaft tapers in their bikes - using a thicker one for the large ignition - they didn't shake loose like the ones in the KTM motors.

_____________________________________________________________________________________

\\"We the willing, led by the unknowing, are doing the impossible, for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do almost anything, with nothing.\\"

1972 Penton Berkshire 100
1983 Husqvarna 250 XC
2011 Jayco 31.5 RLDS
2009 Chevy 2500 HD Duramax

brian kirby

#17
July 12, 2011, 07:24:53 PM
Quotequote:Originally posted by 454MRW

There are at least 2 versions of the heavier 400 flywheel that I am aware of. Here are a couple of pics that I grabbed from current auctions on eBay for the heavier KTM Flywheels. Mike

I know this is an old thread, but I just bought this flywheel off of eBay. I'll give an update when I get it installed and tested. If this thing calms the bike down to the way people say their GS6 400s run I might ride the '77 400 again at the ISDT Reunion Ride. Or not. :D

Brian
Brian
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