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HomeAircraftHelicopterHelicopter Main Discussion › sometimes it's the simplest things
07-30-2017 01:32 PM  14 months agoPost 1
allns47

rrKey Veteran

Richmond IN.

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I been messing around with this os 70 motor for about 3 weeks....it will start up just fine everytime. WHEN I START TO SPOOL up about half throttle it will start puffing out huge amount of smoke like it's really rich..I adjusted the low end middle and high to every combination possible....if I lean the high out enough I can get it to hover with a good trail of smoke still comming out but then it always flames out...This 70 was a recent rebuild ring..liner..piston..bearings...I took it back apart several times to make sure everything looked right. Changed fuel lines and clunk glow plug and even tore apart the carb. MY CLUB JUST got in a new drum of fuel and i always buy a few gallons..Needless to say I fueled my heli up and it started and ran perfect...Just to make sure I tried the other fuel I had which was just bought a few weeks back and it ran like crap again....This is the first time I ever had problems with fuel.. Maybe the fuel i had needed some needle adjustments that I couldn't quite get right..ldk..but I'm headed to the field right now....perfect weather

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07-30-2017 07:03 PM  14 months agoPost 2
JuanRodriguez

rrProfessor

The Villages, Florida

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Not surprised..... that's one of the first things on my "recommendation list" to change when a motor is not behaving as it should........

Been there, done that and old enough to know better.....

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07-30-2017 07:05 PM  14 months agoPost 3
EEngineer

rrProfessor

TX

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Or check the plug, too.

Logo 600SXs, 800XX, TDR IIs

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07-30-2017 07:08 PM  14 months agoPost 4
JuanRodriguez

rrProfessor

The Villages, Florida

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Plug first , fuel second !

Been there, done that and old enough to know better.....

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07-30-2017 10:46 PM  14 months agoPost 5
allns47

rrKey Veteran

Richmond IN.

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A lesson learned

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08-02-2017 08:40 PM  14 months agoPost 6
Richardmid1

rrProfessor

Leeds, England

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FWIW at half throttle it's the mid you need to adjust not the high.

60% of the time, it works every time!

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08-03-2017 12:37 PM  14 months agoPost 7
allns47

rrKey Veteran

Richmond IN.

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Yeah I adjusted it every way possible. ....the new fuel ran perfect...

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08-03-2017 02:53 PM  14 months agoPost 8
icanfly

rrElite Veteran

ontario

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old fuel if stored in a metal can can be good for quite a long time while in plastic it will seep moisture from the air if left in a damp place like a basement.

Your new rebuild probably needs a break in time and using old fuel is not going to help it.

Sounded real bad at first and then you said it ran fine with fresh fuel towards the end of your rant, had me worried for a moment lol

"Simplest things", how about the kst 115/215/315 output servo gear not being made from ti or stainless or carbon steel, even brass would be better than the shytty aluminum one that breaks thereby facilitating dis-assembly of the servo every time, and crashes caused by vibes freaking the gyro and the heli going sideways for nothing, and impossible to stop vibes short of a completely new heli, makes me never want to mess with a 450 or smaller again.

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