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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › os 50 engine skip
10-22-2009 10:16 PM  8 years agoPost 1
garaptor

rrApprentice

Atlanta,Ga,usa

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Why is my os 50 suddenly skipping at hover.Running 15% and headspeed about 1900. changed all fuel lines. It was running fine before.Engine loads up pretty bad coming up to speed but seems to run fine in flight.Just a slight skip that causes it to wag a little.

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10-22-2009 11:32 PM  8 years agoPost 2
Thumpernator

rrKey Veteran

Senoia, Georgia, USA

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It's possible that your old fuel line was collapsed, restricting the flow of fuel. If you had tuned the engine under that condition, then by replacing the lines you caused a richer mixture. Try tuning the engine.

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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10-23-2009 03:09 PM  8 years agoPost 3
BarracudaHockey

rrMaster

Jacksonville FL

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Before you mess with the motor change the plug since you already did the fuel lines.

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

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10-23-2009 03:17 PM  8 years agoPost 4
S76 Mech

rrElite Veteran

Hatboro, Pa.

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bad one-way bearing?
If its the 50 in your Hirobo, check your one-way bearing, if its going bad it will make it seem like a motor skipping/loading up issue. You might be chasing your tail trying to fix a motor problem thats not the problem.

.... Sup Andy! ... go Phils!

Gaui Greatness X7, X5, NX4, X3

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10-26-2009 12:35 AM  8 years agoPost 5
RACER7696

rrApprentice

Ma

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Engine sputter or intermitent lean condition
I had a simmilar problem a while back, After replacing fuel lines I found that there was a little piece of plastic in the nipple of the header tank and periodicly it would restrict the fuel and go into a lean condition. It almost sounds as if the engine has a revlimiter on it like if you wre to take your car engine and floor it in nuetral untill the rev limiter kicks on . Anyway look for a restriction sometimes you can even see a little day light but it is still restricted. I am now convinced that at the begining of every season you should replace all fuel lines. All it takes is the line to get slightly softer and under load and high rpm the engine suction will start to collapse the fuel line and will make the engine start to skip ,or sound like a rev limiter, Or go into a lean condition. If it were me I would take both tanks completly out , I would fish a small drill bit through the nipple to make shure that it is clean , If you can blow through it with a blow gun , Inspect thye fel lines you just put on to make shure tere is no small tears on the lines from when you were installing it the first time.,also blow through th eclunk because sometimes they can get pluged up. If you take the time to do it the right way I guarantee you it will fix what is going on . It deffinetley is fuel line or tank related

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10-26-2009 01:34 AM  8 years agoPost 6
3D-gilbert

rrNovice

USA

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Is this a good engine to start with, someone on here recomend me this engine but would like to know if any bad points

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10-26-2009 10:43 PM  8 years agoPost 7
garaptor

rrApprentice

Atlanta,Ga,usa

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Thanks for the suggestions. Its a Raptor. It flew great all season.After it started skipping I have changed the fuel lines,tuned the low end screw,changed the plug, pulled the fuel lines back out and check clunks(1.5 mil driver will pass thru easily),pulled high speed needle and needle valve holder and checked for debris, still skipping.Full power climbout is great. Guess Ill have to pull the engine and disassemble the carb. I dont know what else it could be.

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10-27-2009 02:48 AM  8 years agoPost 8
RACER7696

rrApprentice

Ma

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Are you shure all the plastic nipples are totally clear, Like I said earlier mine you could see daylight through but whe tt made the tand when they drilled the holes for the nipples (the things that stick out of the header tank and the fuel lines hook up to) There was a little curley q of plastic and it would intermitentley get sucked in. I know how frustrating these things can be but you will find it. Also look at the new fuel lines for possible tint holes from installing them especially if you usued a small flat bladed screw driver. I have done that to my self also.A hole in the fuel line will do the same thing as debri in the line.I would recheck these small details thenn look at taking the carb apart. The best thing is when everything is apart to blow through everything with a compressed air. If you dont have a compressor get a can of air at a computer store or somewher and go that roue but compressed air is a must when trying to clean a carb throughly.

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10-27-2009 11:25 AM  8 years agoPost 9
airdodger

rrElite Veteran

Johnston USA

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Sounds like you are slightly on the rich side, get it to spool up correctly.

Chris

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