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HelicopterGasser Model RC HelicoptersOther › Zenoah PUH 231 Needles Set Help needed.
03-20-2009 06:27 PM  8 years agoPost 1
FloridaHeli

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jacksonville,​florida

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I've been reading Malorie's thread on Gasser Throttle Linkage Setup and learning. I did Malorie's throttle linkage change and the GV-1 mod that Raja has wirtten about and it doesn't over speed on decent like it used to. IT being my Predator Carbon with PUH 231, running on premium gas and 37:1 Amsol, JR X9302 2.4 Tx and SPEKTRUM AR9000 DSM2 9-CHANNEL RX , Stator Gator, GV-611 w/9256, DS8311 on ccpm, DS811 on throttle.

My problem now is the heli coughs or burps. When flying a circuit it does pretty good. Try to hover and it hiccups. Sounds like an air bubble gets in the line. I tried setting the needles at 1-1/2 each then closing them to smooth out the engine. Got them to Low at .9 turn and High at 1-1/4 and it still shudders and shakes when the engine coughs. Can't go lower on the Low needle or the engine will die. I don't want to go leaner on the high without some experienced advice.

I don't see any bubbles coming from the filter or other fuel line fittings but the primer bulb does have an air bubble in it that I can't get out even by laying the hehli on it's side and priming.

The engine has been modified by Toxic Al.

I'm going to take out the fuel magnet and replace the line in the gas tank and the other lines that are getting stiff. They are over a year old and may be getting inflexible.

If anyone has a way to set the needles on this engine please share? I sure could use some help. There are no gas helis at my field. They are all Nitro or Electric.

Thanks in advance for any info you care to share.

This hobby is WAY too expensive!!

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03-20-2009 07:44 PM  8 years agoPost 2
Zman

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Florida

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.9 on low sounds way lean. Is it a 643 carb? Pull the plug and see what it looks like (ie white, dark, somewhere in between?).

Z

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03-20-2009 07:49 PM  8 years agoPost 3
Zman

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Florida

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Also, since you had a fuel magnet, pop the cover off carb on the side with just one screw. You will see a little screen, make sure it doesnt have a bunch of crud hung up there.

Z

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03-20-2009 08:02 PM  8 years agoPost 4
FloridaHeli

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jacksonville,​florida

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Z,

This is photo of plug. It looks brown to me. Photo used flash and long exposure.

This hobby is WAY too expensive!!

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03-20-2009 08:10 PM  8 years agoPost 5
FloridaHeli

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jacksonville,​florida

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The carb is a 643, the one with the choke built in.

Screen had one small spec of something on it. Did not touch it as did not want to damage screen. There were 2 gaskets on it a black one and a light brown one sandwiched between the fitting and carb block.

This hobby is WAY too expensive!!

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03-20-2009 08:40 PM  8 years agoPost 6
Zman

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Florida

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I agree, it doesnt look lean on plug. I never gone leaner than 1.25 turns on low. Lets do this. Do you have or have access to a temp gun? I like tuning my engine by a temp gun pointed around the third fin or so on head. I also tune at the highest rpm the motor will see (idle2).Put the low at 1.25 and the high at 1.5. Hover it at your highest headspeed for 3 minutes or so. Kill the motor and temp the head as soon as you can get the blades stopped. We are looking for somewhere around 220F. If it is hotter than this by say 20-30 degrees back out the high some more.

I should have asked before. What gear ratio and headspeed are you running on the pred?

There is always a chance that the ignition is causing the hiccup sound but usually they are either good or toast. But check the red wire that it is plugged in good, if it is not, that can cause some ignition probs. Although doubtful, if you have a new plug to put in, that would be a worth a try.

Z

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03-20-2009 09:59 PM  8 years agoPost 7
FloridaHeli

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jacksonville,​florida

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I have a temp gun and can use it Sunday when I go to the field again. I'll also install a new spark plug.

My gear ratio is 13:88 or 6.7:1. My head speeds are 1590, 1750 and 1900. which gives motor rpm at 10,760, 11,725 and 12,730.

This hobby is WAY too expensive!!

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03-20-2009 10:12 PM  8 years agoPost 8
Zman

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Florida

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Okay great. Were you getting the miss sound when at 1900 head speed or just the lower head speed?

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03-20-2009 10:43 PM  8 years agoPost 9
Fixit

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UK

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Are you using a champion plug by any chance?

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03-20-2009 10:50 PM  8 years agoPost 10
FloridaHeli

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jacksonville,​florida

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Yes, and yes.

This hobby is WAY too expensive!!

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03-20-2009 11:13 PM  8 years agoPost 11
Fixit

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UK

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Through it away and try another make like NGK, I’ve had the same problem with the champion plugs.

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03-20-2009 11:24 PM  8 years agoPost 12
FloridaHeli

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jacksonville,​florida

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I have a few new NKG but did not use them as Toxic Al prefers the Champion. That is what the photo is.

This hobby is WAY too expensive!!

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03-21-2009 12:14 AM  8 years agoPost 13
Fixit

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UK

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I would give the NGK a try and see if your problem goes away

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03-21-2009 12:20 AM  8 years agoPost 14
FloridaHeli

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jacksonville,​florida

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I"ll do that. What gap would you suggest?

This hobby is WAY too expensive!!

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03-21-2009 02:05 AM  8 years agoPost 15
GREYEAGLE

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Flat Land's

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Take the champion

Open the door that exit's the shop - and wing it out side with all your might ! Been their - done that - Drove me nuts on both of my gassers. Champion resistors are know to open up when they get hot.

I actually chased it to the point, I took it to my neighbor whom owns a small engine distributor and did a demo in the parking lot in front of the morning coffee clutch gang.

Out of at least 7 shop owners their picking up their inventory (none) of them had it figured out -lots of good guesses though.

Kid behind the counter whom we lease our field from, had me hold his donut while he took out my plug on the counter. He then took back his donut, walked to the door and chucked the plug in the parking lot.

Had me hold his donut again, put a NKG plug in, took back his donut and said that will be $1.73. !

We all laughed so hard I will never forget it.

greyeagle

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03-21-2009 03:00 AM  8 years agoPost 16
FloridaHeli

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jacksonville,​florida

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Where can I get an NKG for $1.73??

This hobby is WAY too expensive!!

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03-21-2009 03:08 AM  8 years agoPost 17
Fixit

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UK

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"ll do that. What gap would you suggest?
I’ve asked this before and the general reply was to take it out of the box and use it.

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03-22-2009 03:36 AM  8 years agoPost 18
bosshoss

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Chicago, IL

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Nothing like a new plug for a run and read.

If you have the black phenolic carb insulator , check and see if it is warped. My caused sporaidc hiccups until it finally caused a flame out. If the gasket is wet when you take of the carb , it is leaking.

Mine was so warped that on a flat surface it rocked back and forth.

I know those Toxic motors can have the aluminum insulators. But if you still have the black resin one , check it out.

Why Hover a Yak, when a Heli does it better?

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03-22-2009 03:57 AM  8 years agoPost 19
TaleGunner

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Deer Park WA

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Al at Hanson also has a metal and Teflon block/gasket set available

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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03-22-2009 04:00 AM  8 years agoPost 20
TaleGunner

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Deer Park WA

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What gap would you suggest?
.025

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1978 views
Scorpion Power Scorpion Power
HelicopterGasser Model RC HelicoptersOther › Zenoah PUH 231 Needles Set Help needed.
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