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532 engine problem

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5 months 2 weeks ago #18105 by xpeedfly
532 engine problem was created by xpeedfly
Greetings from Costa Rica!!
I´ve just bought an old 532 single carburator with points but I have a slight problem with my engine, it´s not really critical but it drives me crazy a bit. After 10 - 15 min running sometimes -not always- the engine suddenly loose a bit of power around 700 rpm - 1.000 rpm. it happens normally between 4.500 rpm - 6.200 rpm and I have to release a bit the throotle and then it works again, CHT and EGT are values are normal perhaps a little change of temperature in EGT probe during this moment . Normallly it works again in a few seconds playing a bit with the gas. then rpm estabilize again. It is not critical, but I don´t feel very confident with that.
- When the engine is cold receiving throottle without any problems from min to max rpm.
- Starting engine is without any problems , cold or hot, motor starts at the first pull.
- Idle speed is about 1.800 rpm -tiny tech-,
- Cooling is working ok, I add just destilated water no coolant, I fly wih very high temp above 30ºC always.
Any ideas/solutions would be appreciated
Thanks a lot..!!!

Epecifications Rotax 532
- Take off, From the beach 0m.
- CHT about 180-200F
- EGT 950-1000F sometimes 1050F
- Cooling sensor 170F
- Ide speed 1.800 rpm
- Capacitors, ignition coils and points are new.
- Generator coil resistance values are OK.
- New BING carburator kit, original settings
- New gas lines
- New cooling lines
- Fuel pump is working great.
- New spark plugs. Original 8BRES
- Gas / oil mix 1/50% Motul 710
- Old owner changed pistons and rings about 15 hours ago, -he told me that- I got some pics from the exhaust and it looks no so bad...I guess.

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5 months 2 weeks ago #18106 by Dennisr5
Replied by Dennisr5 on topic 532 engine problem
The egt reading and the spark plug appearance indicate that it is running rich.

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5 months 2 weeks ago #18107 by xpeedfly
Replied by xpeedfly on topic 532 engine problem
Thanks Dennis, I´ll have a look to the carb tune up...

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5 months 2 weeks ago #18108 by Dennisr5
Replied by Dennisr5 on topic 532 engine problem
Float hieght, float fuel saturated, needle jet or jet needle wear, enriching circuit leak, not jetted correctly for the altitude/temperature.
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5 months 2 weeks ago #18128 by xpeedfly
Replied by xpeedfly on topic 532 engine problem
The gas lines are new. Main Jet 195, Jet Needle 15K2 and Needle Jet 2.74 are new and I use a carb rebuild kit. Looking for some leaks, carb, lines, gaskets....it´s look ok. But definitely I agree with you Dennis the motor is not jetted correctly for the temperature, take off sea level, temp about 30C most of the times...

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5 months 1 week ago #18187 by xpeedfly
Replied by xpeedfly on topic 532 engine problem
Thanks Mr Richardson!!! You were right... the problems was the carb, it was not jetted correctly for the altitude/temperature/humidity. Now it works again, 1.5 airscrew mixture and 4 click jet needle..Now it works again!!!!
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4 weeks 8 hours ago #19492 by Sanko26
Replied by Sanko26 on topic 532 engine problem
Hello guys! I'm Sandor from Hungary! I have a bit similar,but not the same problem with my 532. It is a two carb version. When I bought it it was on shelf for 5 years. It was not working as it should. It dropped the rpm after 10 sec 90-100% gas and stabilised at approx 60% rpm . At that time the water temp getting to be higher and higher up to 100 C°. So the mixture was lean. I checked the carbs and recognised that ther are nothing good in them. I put new float arms,needle jets 2.72,jet needles 11G2,two new airfilters. I adjusted the carbs as it written in the manual. The engine did the same shit. From that point I tried everything. I wanted to bypass the vacuum pump so I made a gravity tank, but the engine was a bigger shit without the Mikuni. Should it work with just a gravity tank,without fuel pump? So I found the hole at the float needle too small. It was ca. 1 mm,while the main jet and idler jet together is 2.2 mm. Did all the Bing54s have the same size (1 mm) or exist a bigger size type? So I drilled the hole to 2 mm and adjusted the float level to the required level. The engine started to work almost as it should. Now it can keep the maximum rpm,but above 50-60% rpm it overheats to 90-110 C°. And if I set the gas to a position the rpm slowly changes. It seems sometimes lean sometimes normal the mixture. Now I have really no idea what I should do. Please help me.

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4 weeks 3 hours ago #19494 by Dennisr5
Replied by Dennisr5 on topic 532 engine problem
Has the ignition been gone through? After that long of a storage period I would suspect that should be done. They are a high maintenance item. It is long past due for a crankcase reseal.
Any crankcase or cylinder base gasket leaks can cause the symptoms you describe. You can't tune an engine that isn't sound.

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3 weeks 6 days ago #19496 by Sanko26
Replied by Sanko26 on topic 532 engine problem
Thanks for the quick answer. I will check the ignition with strobe light,but I think it's ok. The ignition sounds continous. But the second one U mentioned I guessed it. I will check around the seals with engine cold starter spray during the engine is running. But I don't know how I shound check the crankcase seals at the side of ignition and the gearbox.

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3 weeks 6 days ago #19515 by Dennisr5
Replied by Dennisr5 on topic 532 engine problem
Take the time to check and set up the ignition properly. Air gap, dwell angle and timing are all critical to proper performance. As I remember, from way back when, these systems require this maintenance every 40 hours or performance degrades

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3 weeks 4 days ago #19521 by Sanko26
Replied by Sanko26 on topic 532 engine problem
I checked some things and now I suspect the fuel pump. Although I disassembled it and found the condition of it right,but some guys mentioned that you can't see any damage on the membranes. They said with the time the membranes are getting to be more and more rigid and they are not able to follow the pressure changes. So now I order a rebuild kit. I will let U know any changes I recognise.

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3 weeks 4 days ago #19522 by Dennisr5
Replied by Dennisr5 on topic 532 engine problem
I don't believe that a fuel pump will cause your symptoms but rebuilding it is inexpensive and it is good preventative maintenance. If a diaphragm fails you normally will find that the cylinder that provides the pulse will go rich and the other cylinder will be lean.

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