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10-11-2013 02:44 AM  4 years agoPost 1
rjflyer

rrApprentice

Valley City, Ohio (Cleveland)

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I am using an OS70 with an SB70 muffler, using 15% coolpower with header tank. The header tank is even with carb inlet. I have been having trouble the past few days, lifting to a hover, I can hear the headspeed is to high, the smoke is slowly dwindling and the RPM is slowing and it sounds like the engine is choking. It doesn't make much difference richening the idle screw, and it is almost completely turned CCW. I have pressurized the fuel line from muffler to carb with no leaking. I have removed the high and mid needles and noticed no junk or obstructions. I have also used mild pressure to blow through the needle openings. This happened all of a sudden, one day it's running fine and then I can't get it to richen up. I have checked everything I can think of....any suggestions? Maybe something I missed or need to check again more thoroughly?

Rick...God,I love this hobby!

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10-11-2013 05:38 AM  4 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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It doesn't make much difference richening the idle screw, and it is almost completely turned CCW.
The "idle screw" is NOT a screw, it is a CAM....Although the post below discusses an OS 55 carb, the material about how the idle adjustment works is what you need to understand if you want to be successful in getting the low speed setting correctly set.

https://rc.runryder.com/helicopter/p5859606/

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Do you have a loose head or backplate bolt; is the muffler header loose or the SB70 O-rings shot and leaking?

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Does the motor rattle at idle, if so your rear bearing may be about done for.

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Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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10-11-2013 07:12 AM  4 years agoPost 3
devin120

rrVeteran

Canada

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...
Think of it this way. the high speed needle is for when your full power.

The idle is from idle to floating. Its a cam. Go slow. Very sensitive.

The mid or hover if you have one, is a silly little needle to adjust the hovering characteristics.

Rule of thumb - When in doubt, go richer. Get that sucker so it wont even hover then lean it out slowly 3-4 clicks at a time until your close.

You adjust your low, then your high, then your low again, then your high, then your mid. Boom done.

DC

Miniature Aircraft - OS power - Futaba electronics

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10-11-2013 06:10 PM  4 years agoPost 4
rjflyer

rrApprentice

Valley City, Ohio (Cleveland)

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sorry the word choice on the idle screw was wrong....should have said idle cam. I had it running good then it went south. I will set everything back to factory settings and try again. Muffler is new and on solid, I checked that. I will check backplate bolts. thanks for the suggestions. I will start fresh and try again.

Rick...God,I love this hobby!

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10-11-2013 06:39 PM  4 years agoPost 5
devin120

rrVeteran

Canada

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carb
Check carb retaining bolt is tight too.

Miniature Aircraft - OS power - Futaba electronics

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