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I am having trouble with my 503 Rotax and wondering if anyone can help?Anyway I have got a second hand Rotax motor which has 0 hrs since rebuild. Anyway I have taken it out a few times and cant get past 4 grand. When it is cold it will go up to full noise until the EGT"s reach about 900 degrees. which is about 10 seconds. I thought it was the main jet and after stuffing around with the carbies I got the sh1ts and bought brand new ones. Motor was tuned up, got new coils, new condensors, new leads. As you can imagine I am getting very annoyed with it. with any fuel problems eliminated I think it the spark is collapsing but cant figure out where the problem is.Any suggestions would be great I am at the point of giving this flamin machine away.
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G"day Tim,You did not mention any work done to the vac fuel pump, might be the diaphram is perished and can"t keep up at full noise.good luck
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Check your exhaust system. I had a two stroke bike
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Thanks guys. I thought it was a pump so it was replaced too. I will sus out the exhaust. the last engine failed when the rear main seal failed leaking gearbox oil into the crankcase so I had a smoke display happening for a while. I am so sick of Rotax motors, makes me think of finishing the suby rebuild.
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Tim I was having that issue too.Were the crankshaft seals done at rebuild??Rob
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No they weren"t. I have the new ones sitting in the shed but thought the old ones were ok so I left them alone. I am going to pull the motor out again and look it over again I think it may be the armature plate in the wrong position, advancing the spark too much. If this dosen"t work apart she comes again and put the new seals in.
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" I am going to pull the motor out again and look it over again I think it may be the armature plate in the wrong position, advancing the spark too much. If this dosen"t work apart she comes again and put the new seals in.
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Anyone wanna buy a Gyro? Goin cheap.
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