Redcat Racing Support Moderated Support Forum for all Redcat Racing Cars, Trucks & Buggies

Motor starts, then quickly dies

Reply
Old 06-21-2012, 08:20 AM
  #1
fun4oli
Thread Starter
 
Join Date: Apr 2012
Location: , CA
Posts: 29
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Motor starts, then quickly dies

I had a fine racing session for a tank-ful with my Volcano S30.

Then Imade a small change to the position of the metal thingy which sits on the rod from the throttle servo to the carburetor (what they call the "throttle/break linkage set", I guess).

I am not sure why that would have made any difference but afterwards the motor would not start, though Imade sure that the carburetor opening was large enough. Itwiddled with the low speed needle and the idle screw. So where I am now is that after Iprime the motor it starts (so plug and plug igniter work), and Ikeep the plug igniter on, but after a second or so the motor dies.

I looked at the manual and it says to check for:
    [*]Idle set too low (no, Isee a good gap in the carburetor opening)[*]Need to lean low speed needle (I did for multiple iterations, no effect)[*]Engine not getting fuel (fuel line is intact, and fuel is running from tank opening where the fuel line attaches)[*]Bad glow plug (no, I keep the igniter on)[/list]But itlooks like after the motor starts it does not get additional fuel and thus stalls.

    Any idea how Icould further troubleshoot this?

    The frustrating part is that had had that great session just before and life was good...

    - Oliver

fun4oli is offline  
Reply With Quote
Old 06-21-2012, 02:37 PM
  #2
derailed75
 
Join Date: May 2011
Location: Danville, VA
Posts: 21
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Motor starts, then quickly dies

Your plug could still be on the way out. If the filiment does not full glow you should change it. Get some extra anyway and try one just to be sure, for somewhere between 5 and 8 bucks it is worth a shot. My first RedCat would run until it warmed up and then it would shut off. I found out I had some air leaks, it is not a bad idea to seal around the carb with high temp gasket sealer just to make sure. Air leaks can be very tricky and can cause a ton of different symtems.
derailed75 is offline  
Reply With Quote
Old 06-22-2012, 09:16 AM
  #3
fun4oli
Thread Starter
 
Join Date: Apr 2012
Location: , CA
Posts: 29
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Motor starts, then quickly dies

Thanks!

I have run the car a total of maybe 4 hours so it would be weird if the glow plug would not be OK. And again, the motor does start, and I keep the glow plug igniter on ... why would the plug and igniter not sustain the motor running?

But I also saw something else when I tried it again:

When Iclose the exhaust with my finger and pull the starter cord to prime the motor gas does get sucked into the motor, I can see the carburetor getting wet and little spits of fuel flying out. I still have an air bubble or two in the line. I release my finger and attachthe glow igniter, start the engine. The motor starts, but the air bubbles stay in place. Maybe the fuel just flows around them.Or does maybe the motorjust not suck gas from the tank once I release my finger from the exhaust?

Is that a clue?
fun4oli is offline  
Reply With Quote
Old 06-22-2012, 02:20 PM
  #4
derailed75
 
Join Date: May 2011
Location: Danville, VA
Posts: 21
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Motor starts, then quickly dies

Its not unusual for a glow plug to burn out during break in. There cheap and an easy fix. If that doesnt work bag it and use it again. Air leaks are a pain and checking for them is just as bad. Basically take the motor aparrt and seal it up as you put it back together. Check youtube for a video guide of doing it.
derailed75 is offline  
Reply With Quote
Old 07-03-2012, 01:49 AM
  #5
lifeismuddy
 
Join Date: Jan 2012
Location: Howard, PA
Posts: 53
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Motor starts, then quickly dies

it is very possible you have a scarred piston or sleeve, just had 1 come in with the same issue. prime it, start it, stalls had good compression, did tear down and found that both had some pretty good scratching on sleeve and piston come to find out the only thing they did for break-in was 1 tank of fuel and 30% at that.
lifeismuddy is offline  
Reply With Quote
Old 07-04-2012, 10:57 AM
  #6
fun4oli
Thread Starter
 
Join Date: Apr 2012
Location: , CA
Posts: 29
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Motor starts, then quickly dies

Dear all,

well, the resolution was much less dramatic. I emailed Redcat to send me the "factory settings" for the needles (they do not write about them in the manual for whatever reason). Iset them to the factory settings and the motor started again!

Still thanks for all your suggestions.

Best, Oliver
fun4oli is offline  
Reply With Quote
Old 02-29-2016, 12:34 PM
  #7
Cessna172SPFlyer
 
Join Date: Feb 2016
Posts: 1
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

So what are the *factory settings* for LSN and HSN. I get that idle needs to be 1 - 2mm.
Cessna172SPFlyer is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 07:17 PM.