OS 55hzr shimming

[flyalan]

What fuels were you running? That is always helpful to know as well.
I have been running CY 30% for 2 years now.   Year and a half on the n5c. If I recall correctly only two burnt out glow plugs in that amount of time and I never use after run oil.  Engine purrs like a kitten.
Of course I am sure I just jinxed myself:-)

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[Rodney Kirstine]

Torco and Cool Power. The Torco is the one that's been more fussy fire me to tune with. I bought a couple cases of it because it was the same price, shipped, as what I can buy Cool Power for locally. The LHS that carries it, though, is not really convenient for me. I'll probably be buying the Cool Power from now on, locally though, because it seemed easier to tune.  I've had glow plug issues with the other, as well.

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[Kevin Feil]

No shims here on the 55. I'm running CP 30% as well... I always add a "cap full" of Marvel Mystery oil to my Gallons of fuel. Never run after-run oil..


K

[John]

Also take a look at the engine for any abnormal wear.

I had an issue with the con rod on my 55HZ where the rod was not to spec.  Before I knew that was the issue, I too added a shim which seemed to help.

10 flights or so after adding the shim I started to notice the motor sounded like a bag of bolts rattling around in idle but would sing and pull like nobody's business in the air.  Broke the motor down and noticed some small metal shavings...con rod was floating on the crank and bottoming out on the case.

Not saying your motor has an issue, as others have said, style and location play a big role as well. 

[Paul66]

HI All
Thought I would tag on to this post, I just put a N5C together to keep the old N5 company. I installed a OS55HZR with a powerboost pipe and OS #8 plug, I do not appear to be able to tune from idle as soon as the throttle is increased the pipe appears to spit fuel out and lots of smoke, even with mid needle fully in, just cannot lean out the machine to hover. Luckily I had a spare carburettor and exchanged but retained the regulator and then managed to get the motor to run better. I have cleaned out the regulator and even blown it out with compressed air. Has anyone seen this issue before, the engine is straight out of the box so very frustrated with what should have been a straight forward fit and tweak from the specified mid 1 turn and full 2 turns. Do I appear to have got a wrong sized jetting in the new carb?

cheers
Paul