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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › WHat to look for in a used Hyper 50
11-21-2006 07:32 AM  11 years agoPost 1
Rennster

rrVeteran

Hawaii

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I'll be looking at a used Raptor with a used Hyper 50 in it. I was wondering what do I look for and need to be aware of in a used engine? Is there a way to check for good compression? thanks

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11-21-2006 09:12 AM  11 years agoPost 2
StillTryin

rrApprentice

Perth, Western Australia

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I'm sure others will have much to add but here's a start:

Ideally you need to remove the engine from the heli and the muffler. Look into the exhaust opening for the colour of the piston top which should be either metallic or slightly honey coloured at most. Check for scoring of the liner and any irregularity of the piston.

To test compression, make sure that there is some oil through the engine and turn it over using the fan with a plug in situ. It should require obvious force to turn it over. Do it slowly to listen for compression being lost past the ring - you will also feel the loss of compression too. If tested for compression in the heli, it is impossible to turn the engine over past compression using the starter coupler between your fingers.

I'd be very interested in the main bearing. You would need to remove the back plate to look for corrosion and runout or play in the bearing. Feel for roughness also. If there is any doubt, replacement is indicated as a bearing failure can mean a wrecked engine.

Finally, ask to hear it running: does it idle, does it rattle, does it transition well, how well does the heli climb out(power), are the needles in standard position, how hot is the backplate straight after landing etc.

If you have little experience, better still, ask an expert to look at it for you.

I hope this helps.

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11-21-2006 10:24 AM  11 years agoPost 3
Jafa

rrElite Veteran

Sydney, Australia

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When looking into the exhaust port,
note the color of the ring, it should be black.
If the ring has a shinny alloy/metal color
then it's worn out


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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11-21-2006 03:13 PM  11 years agoPost 4
BarracudaHockey

rrMaster

Jacksonville FL

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Be careful when judging the coloration, mine look kind of cooked but its the reside from the red fuels and comes right off with your finger, when I ran CP 15 they had a green tint.

Also you cant inspect the bearing with the stock crank shaft in place as it has the crank webbing unless the person took a grinder to the crank shaft.

Andy
AMA 77227
http://www.jaxrc.com

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11-28-2006 12:57 PM  11 years agoPost 5
StillTryin

rrApprentice

Perth, Western Australia

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Hey Rennster
Presumably you found the information herein of value

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