How long to run-in a 503.

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nickjaxe
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How long to run-in a 503.

Postby nickjaxe » Mon Jul 02, 2007 11:10 pm

Hi guys I have re-built my 503 with new oversized pistons/cylinders and ground run it for 1 hour as per the rotax instructions,


Just wondering when could I consider that the engine is fully bedded
in to be able to carry out an accurate compression test.

Nick.
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Duck Rogers
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Postby Duck Rogers » Tue Jul 03, 2007 8:55 pm

Nick.....about an hour will do.
Check page 63 of the Rotax Installation Manual for the 503. If you don't have the manual, download it from here:http://www.ultralightnews.ca/rotax503/r ... manual.pdf
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Postby KFA » Wed Jul 04, 2007 5:34 pm

There is a difference between being run in and properly bedded. I would say arround 25-50 hr's for a two stroke and arround 75-100 hours for a four stroke. Just my oppinion. :roll:
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nickjaxe
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Postby nickjaxe » Wed Jul 04, 2007 6:21 pm

Hi duck yes thats what I used to cover the 1 hour ground run,

but I was wondering how long does it take for the rings to fully bed in,

did a compression test after the 1 hour ground run and got 100psi cold both pots.

Nick.
Last edited by nickjaxe on Thu Jul 05, 2007 10:45 pm, edited 2 times in total.
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Duck Rogers
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Postby Duck Rogers » Thu Jul 05, 2007 6:21 am

KFA wrote:There is a difference between being run in and properly bedded. I would say arround 25-50 hr's for a two stroke and arround 75-100 hours for a four stroke. Just my oppinion. :roll:
You're right. I didn't read the question properly :oops:
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Quentin Ferreira
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Postby Quentin Ferreira » Thu Jul 05, 2007 9:44 am

3 to 4 hours......Dont try and do long trips and not open throttle for a long time ....
The best way is to do a couple of circuits where you have dif throttle settings

Quentin Ferreira
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Postby nickjaxe » Thu Jul 05, 2007 10:44 pm

Thanks guys, just tried a better comp tester I now get 125psi cold,

My other tester had a sticky valve.

Nick.
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