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503 troubles ...

 
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nazz57(at)yahoo.com
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PostPosted: Sat Jun 12, 2021 4:43 pm    Post subject: 503 troubles ... Reply with quote

i having RPM issues.. i have a dual carb Rotax 503. i can't get my RPM's to go over 4000. the engine runs smooth at idle but just won't rev up. you think my carbs are "gummed up"? ....... any ideas?
2 broke Tim


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Richard Pike



Joined: 09 Jan 2006
Posts: 1649
Location: Blountville, Tennessee

PostPosted: Sun Jun 13, 2021 3:46 am    Post subject: Re: 503 troubles ... Reply with quote

Did the engine previously run normally with that same prop at the same pitch? And now will not? Or is this a new engine prop combination?

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PostPosted: Wed Jun 16, 2021 7:06 pm    Post subject: 503 troubles ... Reply with quote

Time: 04:59:32 AM PST US

From: "Stuart Harner" <stuart(at)harnerfarm.net (stuart(at)harnerfarm.net)>

Subject: RE: 503 troubles .....

What happens if you apply the enricher as it starts to bog down?

If making the mixture more rich helps then it is running lean when

bogging down and you likely have an air leak. The only two places I can

think for air leak is the carb boot or the crank seals. Carb boots are

notorious for this and easy to replace. I hope your crank seals are

fine.

If making the mixture more rich contributes to the problem it is already

running too rich. Are you seeing any additional smoke at 4000 RPM? If

too rich, perhaps the little rubber tip on the enricher is bad and

letting too much fuel in.

Let us know what you find........

‚Äči've been watching videos about 2 stroke engines "bogging down" at higher RPM's. one thing could be bad seals on the engine crankcase and/or carbs. the engines run fine at lower rpm's but when power is added the engine starts to "suck air" thru old seals and so you have too much air causing the engine to "bogg down". i've purchased 2 rebuild kits for my carbs, let's hope that's all it is.

Rotax wants $525 each for new carbs.


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