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HomeAircraftHelicopterGasser Model RC HelicoptersOther › gasser predator help
09-09-2015 09:42 PM  35 months agoPost 1
raptornoob

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shrewsbury. ma. u.s.a.

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short video
ive been out on back surgery and im board so im playing with my century.....but not having much luck again

ive changed carbs diff types walbros and she starts and runs and fly for a minute or 2 and then i cant get fuel into the carb till she cools

need some tuning advice maybe
need new isolator
need throttle curve help

Watch at YouTube

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09-09-2015 10:09 PM  35 months agoPost 2
BeltFedBrowning

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Kansas City

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Is the motor really too hot? Do you have a way to measure the temp of the head? Infrared temp gun is what I use.

They have some cheap ones for RC cars that work great

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09-09-2015 10:16 PM  35 months agoPost 3
mcfast

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Quebec Quebec Canada

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I would start with a new isolator first, before going too far in the wrong direction.

P.S. sorry for the spelling or the grammar I am dyslexic!

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09-09-2015 10:19 PM  35 months agoPost 4
BeltFedBrowning

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Kansas City

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What kind of flying do you want to do? This will help determine the throttle curve. My gassers fly sport at around 35% throttle

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09-10-2015 12:59 AM  35 months agoPost 5
raptornoob

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shrewsbury. ma. u.s.a.

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yes just a sport flyer, and no not at friends house im staying at i dont have temp gun,,,but i swear it runs 5 minutes at most.....and i cant get fuel up thru bulb, and if it cools for a little bit...it will run again

but i did order a newer isolator and teflon gaskets to change out, there one with heat fis on it, but i dont know how long from china,,,,but new ones here the 14th.....

but truth i have never got this bird to fly more than that.....a little longer when i lost the battery and crashed....i sit it on a shelf

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09-10-2015 01:50 AM  35 months agoPost 6
turboomni

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East of the Equator

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Well a good bet it is overheating. I had a similar problem years ago with my 26cc. Ran fine for a little while then get lean and over heat and lose power and land. It was my crank seals letting in air.
Also had another problem that acted sorta the same way and it was a leak on the carb gasket. How bad was your last crash??

Setup is everything, All my heli's can fly far better than I can pilot them

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09-10-2015 02:09 AM  35 months agoPost 7
RM3

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Killeen, Texas - USA

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vapor lock or you need a carb rebuild... if you cant get it to put fuel into the carb the fuel is getting too hot, vaporizing and pushing the liquid fuel back out the line...OR, there is an issue with the rubber parts in the carb itself and you maybe need to replace them and clean it out.

by the sound of it at idle, its very crisp and does not 4 cycle much at all...so it sounds a bit too lean at idle.

showing a preference will only get you into trouble, 90% of everything is crap...

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09-10-2015 02:21 AM  35 months agoPost 8
raptornoob

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shrewsbury. ma. u.s.a.

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i wish i could actully hear the 4 cycle sound
im going to pull apart tomorrow, i got to get some rest, but i will take as many photos as i can....maybe something i don't see,

p.s. after crash ive had 3 new carbs, and all the same affect, and also re plumbed tank 2 times

i wish i could find...

but thanks and good night

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09-10-2015 03:33 AM  35 months agoPost 9
turboomni

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East of the Equator

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After 3 carbs I cant see the "carb" as the problem. Either the needles aren't rich enough,,or the carb gasket is not doing it's job or the gasket is mounted wrong [pulse hole blocked] or there is a leak somewhere. I have never used a heat isolator on the carb even though my Spectra gasser had a carbon fiber one in the box. I would richen it up. Make sure you know what carb you have and check with Raja's posts as to what the needles should be as a starting point. If then you still have problems then you either have a leak at the carb or elsewhere ,,maybe as I said the crank seals. I saw Raja at a fun fly earlier this summer. I had him check out my Spectra with a early Hanson 30cc puh engine. I run 32 to 1 oil mix. She is smoking and 4 cycling like crazy at idle. When you run it up she takes awhile to clear her throat and then the smoke disappears and she runs great. I can dump full negative collective and she won't overspeed. I asked Raja if I should lean out the the low abit so she could spool up easier and he said ,,leave it where it is. With gassers error on the rich before going leaner.

Setup is everything, All my heli's can fly far better than I can pilot them

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09-10-2015 04:17 AM  35 months agoPost 10
rctrooper1

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Brownsville, Texas

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I always started 1/14 turns on the high and 1 3/8 on the low. As stated by turboomni. Stay on the rich side

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09-10-2015 02:46 PM  35 months agoPost 11
raptornoob

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shrewsbury. ma. u.s.a.

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well up early guys
ew video for you-all to watch

disassemble stuff......LOL

Watch at YouTube

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09-10-2015 03:15 PM  35 months agoPost 12
JuanRodriguez

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The Villages, Florida

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What fuel, oil and fuel to oil ratio are you using ?

As you look through the intake, pull the piston down so that you can see the top of the piston where the piston ring sits.... how does that area look ?? Are there any score marks on the piston ? Is there any evidence of aluminum deposits on the piston ring ?

Lastly, while you are looking through the intake at that piston and ring, is there any way you can "wiggle" the piston up/down ? What I'm looking for is that you can see a little movement of the ring in its groove...... If you don't see this movement, you might have a "stuck ring".......

I don't know if a stuck ring will give you the symptoms you're experiencing but it's certainly a possibility.....

A stuck ring may make the motor hard to start and you're not experiencing that problem so, I'm just thinking out loud.....

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

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09-10-2015 05:04 PM  35 months agoPost 13
turboomni

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East of the Equator

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What carb you running and what are your present needle settings?

Setup is everything, All my heli's can fly far better than I can pilot them

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09-10-2015 05:49 PM  35 months agoPost 14
BeltFedBrowning

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Kansas City

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Your feed and return lines are correct. Return goes to the bulb. Is the isolator block still flat at the gasket surface? If in doubt, you could dress it with a bastard file.

The vent line looks kinked at the tank. Is the vent line nipple on the tank just that and not submerged in fuel?
I have seen people have as many problems with the Teflon gaskets as the paper ones. Do you have a paper gasket to replace the Teflon gasket? Just for a test run.
If I were there, I would inspect the isolator block for flatness, replace the isolator gasket with paper, inspect or replace the carb gasket. I would take the vent tubing off the tank nipple for the flight. I would take the return line tubing off the upper nipple on the carb and tie it to the top of the frame. The carb will only will only leak fuel here when you push the primer bulb, so don't do it in the house.

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09-10-2015 05:53 PM  35 months agoPost 15
turboomni

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East of the Equator

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I thought the same thing that the vent looked kinked but he said it was free.. Maybe it collapses completely when running??

Setup is everything, All my heli's can fly far better than I can pilot them

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09-10-2015 07:11 PM  35 months agoPost 16
RM3

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Killeen, Texas - USA

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its running too hot...if you put your finger on the carb and it "feels" too hot, then it is...if you cant keep your finger on the bottom of the engine case for more than 5 seconds, its to hot....he said that three carbs later and its still doing the same thing...its either the tubing, which has been disproved by the OP or the setup is wrong on the throttle (needle settings vs butterfly position).

showing a preference will only get you into trouble, 90% of everything is crap...

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09-10-2015 07:16 PM  35 months agoPost 17
raptornoob

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shrewsbury. ma. u.s.a.

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ok next step
predator new carb and start.......... yes carb 4

Watch at YouTube

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09-10-2015 07:19 PM  35 months agoPost 18
raptornoob

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shrewsbury. ma. u.s.a.

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yeah.....flight.................ahh no luck
it flew longer new carb new settings and i give up for today.......

Watch at YouTube

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09-10-2015 08:37 PM  35 months agoPost 19
rctrooper1

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Brownsville, Texas

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all my gassers never smoked like yours. if it wasn't for the sound of the gas engine it looks like a nitro smoke trail. It may be the oil and gas mixture you are using. definitely get a gv-1. It will simplify your gasser experience and help you adjust your throttle curves.

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09-10-2015 08:43 PM  35 months agoPost 20
mcfast

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Quebec Quebec Canada

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When my predator gasser did that it was the carb inlet in the tank, it had a air leak, it would only run good on a full tank, but when it got close to the inlet in the tank. it would start sucking air and run real bad, I redid all the lines in the tank, now it is all good, hopes this helps.

P.S. sorry for the spelling or the grammar I am dyslexic!

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