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-   -   How many are using the Novarossi 91 HR? (http://www.helifreak.com/showthread.php?t=167550)

timeoutdan 10-11-2009 09:38 AM

How many are using the Novarossi 91 HR?
I have a lot of questions about this engine. I can't get mine to run properly. It turns off and sputers when spooling up. Thanks.

helimik 02-24-2010 06:28 PM

Mine did the same thing, had to lean the high needle valve to get it to spool up without dieing. Still breaking it in. Did run really rich at the recommended break in settings and would die at mid throttle on spool up.

gorn 02-25-2010 09:23 AM

leaning high needle for spool up?
That sounds very odd, seeing as the high needle is doing nothing at low rpm.

On mine I just leaned the low needle until it would idle properly without dying.
Still does not transition onto the mid needle very smoothly.
If I try and push through it with throttle, it will sometimes cough and die.

How new is your engine?
The motor is quite tight when new, so you will be able to slowly richen the idle needle bit by bit as you get more fuel through it.

Mine did fly on the recommended mid and high needle settings, but it was only good for slow FF and hovering for break in.

As helimik said, stock setting are VERY rich.

Buy yourself a temp gun, it helps a lot to see whats going on.
I use mine all the time to check high needle settings for a day of 3d.

Any other questions, ask away, and I will help if I can.

I have about 5 gallons on mine now, in a Trex 700N, using the Novarossi pipe.

MartinS819 04-18-2010 03:39 AM

Yup the NR can take a while before it gets to it's max power. In the NR91 owners thread Stuart mentioned he'd gone through 18 tanks before the engine opened up. Also, be sure that you have your carb on very tight. Luca recommends you push the carb on as tight as possible before tightening the clamp. If the engine's already in the heli, loosen the clamp, and use a medium driver or a main shaft as a lever to push the carb down from the fan shroud and tighten the clamp screw. This is because the inner O-ring, not the outer one on the carb, needs to be compressed very tightly.


ininverno 04-19-2010 04:10 AM

dear Gorn
were you buy your engine?
also Have you try a OS8 plug?
I wait your answer.

gorn 04-19-2010 08:32 AM

Hi Luca
I bought my motor from here www.takeoffandland.com.au
I have only used the Nova plug, and the Enya 3.
I have some OS 8's here, but have not tried them yet.

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