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503 No fire on front cylinder for 10-15 seconds

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Andy Hughes

Active Member
Joined
Oct 26, 2019
Messages
43
I have an ultralight with a 503 dual ignition single carb. When the engine is cold it fires up but runs only on the back cylinder for 5-15 seconds then both work. Vacuume leak at the front seal? After it warms up and I accelerate to 4000 rpm one cylinder(I'll find out tomorrow) EGT shoots up 150 degrees almost instantly. At idle the EGT and head temp are close but it takes the front head 5 min to catch up. There is also a funny rattle, sounds like a ball bearing in a steel can sound at the same time.
 
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