RR Rated M For Mature
HOME   rrTV-PHOTO   GALLERIES   MY GALLERY   HELP-FAQ
myHOME PM pmRR MEMBERS 856 ONLINE 18 EVENTS SEARCH REGISTER  START HERE
 
1 page209 viewsPOST REPLY
Midland Helicopters . HeliProz . Ron’s HeliProz South

.
.
Engines Plugs Mufflers Fuel > 91ST giving me fits!
 
 
basmntdweller
Senior Heliman
Location: Indianapolis IN

My Posts This: Topic  Forum		I have a well used 91st that I had been flying in one of my Fury Extremes. I pulled it out to put in my new Trex 700. Since the swap, it refuses to transition from idle. It will idle smoothly for quite a while but as soon as I try to pick up the throttle it bogs and dies. It sounds like it is loading up but I'm not positive. If I leave the glo starter on it and spool it up, I can idle it down, remove the glo starter and it usually will get through enough to spool up again. I have tried going both ways on all three needles but not making much difference. I keep going back to factory on the mid and high to try again. I don't know where the low needle should be according to factory setting. It only wants to idle at about half turn out.

Any suggestions?
Thanks, Matt


Stupid people have no idea how stupid they are!!!
11-03-2009 03:04 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
MikeInMobile
Key Veteran
Location: Mobile, Alabama

My Posts This: Topic  Forum		Sounds like you need a hotter plug! I use Enya #3's on all of my helis to prevent this problem.
11-03-2009 03:40 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
basmntdweller
Senior Heliman
Location: Indianapolis IN

My Posts This: Topic  Forum		That's what I am running. I used to run OS 8's but switchedto the enya 3's last year


Stupid people have no idea how stupid they are!!!
11-03-2009 04:03 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
MikeInMobile
Key Veteran
Location: Mobile, Alabama

My Posts This: Topic  Forum		Try leaning out your low needle just a tad ..... The plug may be getting a little wet at idle.
11-03-2009 04:13 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
basmntdweller
Senior Heliman
Location: Indianapolis IN

My Posts This: Topic  Forum		I've had the idle down as low as 1/4 turn. Any lower it won't start or run. Any idea where the idle needle should be?


Stupid people have no idea how stupid they are!!!
11-03-2009 08:34 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
MikeInMobile
Key Veteran
Location: Mobile, Alabama

My Posts This: Topic  Forum		How high is your idle? If your idle is too low, the plug may cool down during extended idle periods.

As far as the low needle, adjust it so that the engine transitions quickly and smoothly from idle to full throttle.
11-03-2009 08:58 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
airdodger
Elite Veteran
Location: Johnston USA

My Posts This: Topic  Forum		Did you try a new plug?

Chris
11-03-2009 09:40 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
basmntdweller
Senior Heliman
Location: Indianapolis IN

My Posts This: Topic  Forum		New plug was going to be next on my list. I had ran out and new ones just came in this evening. I had swapped one out of one of my other 91s but it had been in that heli at least all of this year maybe even all last year. I won't get a chance to fly again till the weekend. I'll update then.

Matt


Stupid people have no idea how stupid they are!!!
11-03-2009 11:43 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
basmntdweller
Senior Heliman
Location: Indianapolis IN

My Posts This: Topic  Forum		I got a chance to fly last night. The new plug helped but it's still not right. It's right at quarter stick that it goes flat and wants to die out. I keep thinking it has to be the mid range needle but I've tried both richer and leaner but it doesn't fix the problem.

Matt


Stupid people have no idea how stupid they are!!!
11-05-2009 02:29 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
MikeInMobile
Key Veteran
Location: Mobile, Alabama

My Posts This: Topic  Forum		Had a similar problem once before and it ended up being a clogged needle valve. Hookup the carb, after you remove it from the engine, to an air source of about 20 PSI. While applying the air pressure, slowly cycle the throttle from idle to full a few times. Listen to the airflow, and you can see if that is the issue (you can actually hear the airflow).

I actually use a Robart air pump when I do this
11-05-2009 03:05 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
basmntdweller
Senior Heliman
Location: Indianapolis IN

My Posts This: Topic  Forum		I had been suspecting a clog, I just didn't want have to tear it apart.


Stupid people have no idea how stupid they are!!!
11-05-2009 05:21 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
MikeInMobile
Key Veteran
Location: Mobile, Alabama

My Posts This: Topic  Forum		You can perform the clearing with the carb installed, but the trash will end up in your engine if you do!

If you put a little alcohol into the fuel line before applying the pressure, it will make the cleaning a little more effective and quicker! I like to use grain alcohol for this whenever possible as it works a bit faster than rubbing alcohol.
11-05-2009 05:25 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
airdodger
Elite Veteran
Location: Johnston USA

My Posts This: Topic  Forum		Try opening the idle needle until it acts correct.

Chris
11-05-2009 11:38 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
jamonmodels
Senior Heliman
Location: Bay Area

My Posts This: Topic  Forum		This is from Ron's website. Something to look into!!! Helped me out with idle issue.

Quote 
My YS engine used to start very easy, but now it's hard to turn over and floods all the time.

If you've had the engine a while, it might be time to flush out the muffler. As time goes on, oil will accumulate in the muffler and can even run into your engine, causing it to hydrolock. Just pour some alcohol into the muffler, plug the outlets and give it a good shake. Drain it for a while then reinstall it.

This is true of any two stroke engine, but it's more prevalent in the YS engines.

WHAT!! Try this credit card!!!
11-06-2009 12:26 AM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE   GALLERY
 
 
ava#
Heliman
Location: wa

My Posts This: Topic  Forum		I have a YS 91 I bought used. It does the same thing if I pinch the fuel line to kill it at the end of the day. I now disconnect the fuel line and run it dry. The pump and carb seem to gum up. I fixed the gumming by removing the hover needle and fuel line to the pump. Then back flush the carb and fuel pump with fuel using a small squeeze bulb, the throttle must be 1/2 open for the flush to flow through the carb.
11-06-2009 01:37 PM
PROFILE   PM   EMAIL   POSTS   BUDDY   IGNORE  
 
 
1 page209 viewsPOST REPLY
MTA Hobbies . Model Rectifier Corp . ReadyHeli

.
.
Engines Plugs Mufflers Fuel > 91ST giving me fits!
 Print TOPIC Advertisers 

Subscribe to This Topic

Tuesday, November 24 - 9:15 pm - Copyright © 2000 - 2009 runryder.com | email | link to rr | START HERE | NF