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Author Topic: Backplates for LA-40/46 -Bad-  (Read 708 times)
Curtis Shipp
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AMA 753063 / Advanced Stunt Flyer Finally


« on: July 23, 2012, 11:55:14 AM »

I have just been informed of a problem with the last batch of backplates. If you have a backplate please check the crankshaft for clearance before using the backplate. If you need a new one contact me at   m14m21 at bellsouth dot net  One was installed and galled up. 
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FLOYD CARTER
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« Reply #1 on: July 23, 2012, 03:50:29 PM »

I had that problem with 2 that I ordered.  The fix was easy: just some sanding with 320 on a glass plate.  Had to repeat a couple times to get what seemed like good crankshaft run-out.  It really isn't worth the time and effort to return them.

Floyd
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Douglas Ames
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« Reply #2 on: July 23, 2012, 08:41:15 PM »

Keep in mind there is a thrust washer between the drive washer and crankcase. Double check to see if it's installed, especially if it's a 2nd hand engine.
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FLOYD CARTER
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« Reply #3 on: July 24, 2012, 02:37:07 PM »

Washer or no.  If the crank rubs on the backplate, you will get poor runs and black goo coming out of the exhaust. The OS steel washer is mainly for those who use an electric starter (I don't)
Floyd
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Dick Pacini
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« Reply #4 on: July 24, 2012, 03:04:47 PM »

Curtis, what is the correct step dimension from the mounting ears to the pilot of the backplate?  Perhaps we could measure our own prior to installing.
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Curtis Shipp
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AMA 753063 / Advanced Stunt Flyer Finally


« Reply #5 on: July 24, 2012, 06:31:57 PM »

I only have about 25 backplates that are wrong out there. I will measure the distance and let you know. It looks as if the parting tool got changed and did not repeat. I will ship new ones to anybody who has problems.
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