R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro On-Road

Reply
 
Thread Tools Search this Thread
Old 11-10-2012, 02:34 AM   #1
Tech Rookie
 
Join Date: Nov 2012
Location: QLD Australia
Posts: 16
Default FS12 Nitro engine wont start ?

Hey I have a nitro road car with a fs12 sw engine in it with a tamiya chassis and i cant get the car to start ! The only way it will start is if i pull the glow plug out and put fuel down the carby then it will start first time and run for a few seconds, Would anyone be able to help me ? Thankyou!
Sambo 7 is offline   Reply With Quote
Old 11-10-2012, 03:48 AM   #2
Tech Elite
 
blis's Avatar
R/C Tech Elite Subscriber
 
Join Date: May 2008
Location: Brisbane
Posts: 3,434
Default

Quote:
Originally Posted by Sambo 7 View Post
Hey I have a nitro road car with a fs12 sw engine in it with a tamiya chassis and i cant get the car to start ! The only way it will start is if i pull the glow plug out and put fuel down the carby then it will start first time and run for a few seconds, Would anyone be able to help me ? Thankyou!
Then fuel isnt being supplied via carby..

Check fuel take for leaks, fuel lines, perhaps HSN needle is too lean, blocked or closed. Check fuel pressure line. Check idle gap = approx 1mm
__________________
RC Cars: E4/G4/TCX/LAB-C02/T4'15/MM Engines
WEB: Beachmums Racing - MYRCM Race Registration
Media: Amain - RCRacingTV - RedRC - LiveRC - blisx264
blis is offline   Reply With Quote
Old 11-10-2012, 01:58 PM   #3
Tech Rookie
 
Join Date: Nov 2012
Location: QLD Australia
Posts: 16
Cool

Quote:
Originally Posted by blis View Post
Then fuel isnt being supplied via carby..

Check fuel take for leaks, fuel lines, perhaps HSN needle is too lean, blocked or closed. Check fuel pressure line. Check idle gap = approx 1mm

Thankyou ill try that let you know
Sambo 7 is offline   Reply With Quote
Old 11-10-2012, 02:02 PM   #4
Tech Rookie
 
Join Date: Nov 2012
Location: QLD Australia
Posts: 16
Default

Ok so the idle gap is about 2mm and ive been trying to change it by screwing the "idle screw" nothing happens? what can i do ? Thanks
Sambo 7 is offline   Reply With Quote
Old 11-10-2012, 03:49 PM   #5
Tech Master
 
Geezatec's Avatar
 
Join Date: Oct 2007
Posts: 1,460
Default

If you have a duel rate wheel on your TX turn it down. It changes the throw on the throttle servo.
Geezatec is offline   Reply With Quote
Old 11-10-2012, 04:02 PM   #6
Tech Rookie
 
Join Date: Nov 2012
Location: QLD Australia
Posts: 16
Default

Thankyou but whats a duel rate wheel on your TX im only new to these cars
Sambo 7 is offline   Reply With Quote
Old 11-10-2012, 04:17 PM   #7
Tech Elite
 
blis's Avatar
R/C Tech Elite Subscriber
 
Join Date: May 2008
Location: Brisbane
Posts: 3,434
Default

Quote:
Originally Posted by Sambo 7 View Post
Hey I have a nitro road car with a fs12 sw engine in it with a tamiya chassis and i cant get the car to start ! The only way it will start is if i pull the glow plug out and put fuel down the carby then it will start first time and run for a few seconds, Would anyone be able to help me ? Thankyou!
It's not recommended, but you can disconnect the pressure line from the exhaust pipe, and blow into it and see if fuel is getting into your carby, you should hear it.

As for the idle gap not changing. It should get bigger, if it doesnt, carby may be seized or the screw has slipped out from the slider? If it wont close, it can be the servo and throttle connection preventing it closing. Hence the boys asking your about the rate on your transmitter
__________________
RC Cars: E4/G4/TCX/LAB-C02/T4'15/MM Engines
WEB: Beachmums Racing - MYRCM Race Registration
Media: Amain - RCRacingTV - RedRC - LiveRC - blisx264
blis is offline   Reply With Quote
Old 11-10-2012, 04:24 PM   #8
Tech Rookie
 
Join Date: Nov 2012
Location: QLD Australia
Posts: 16
Default

The fuels flowing through the carby no the screw hasent come out.... and the connections seem to be fine.. maybe i should go buy a new carby ? thankyou
Sambo 7 is offline   Reply With Quote
Old 11-10-2012, 05:03 PM   #9
Tech Elite
 
blis's Avatar
R/C Tech Elite Subscriber
 
Join Date: May 2008
Location: Brisbane
Posts: 3,434
Default

Quote:
Originally Posted by Sambo 7 View Post
Hey I have a nitro road car with a fs12 sw engine in it with a tamiya chassis and i cant get the car to start ! The only way it will start is if i pull the glow plug out and put fuel down the carby then it will start first time and run for a few seconds, Would anyone be able to help me ? Thankyou!
I re-read it again.

By taking the glow plug out you may have un-flooded the engine. Which means there's too much idle and or the bottom mixture screw is too open allowing too much fuel in the mixture.

brb

http://www.rctech.net/forum/10423342-post10.html

So when you remove the plug and turn it over does the cylinder produce a spray or mist?
__________________
RC Cars: E4/G4/TCX/LAB-C02/T4'15/MM Engines
WEB: Beachmums Racing - MYRCM Race Registration
Media: Amain - RCRacingTV - RedRC - LiveRC - blisx264
blis is offline   Reply With Quote
Old 11-10-2012, 05:10 PM   #10
Tech Rookie
 
Join Date: Nov 2012
Location: QLD Australia
Posts: 16
Default

Yes when the glow plug is out and i pull the starter a mist comes out ?
Sambo 7 is offline   Reply With Quote
Old 11-10-2012, 05:20 PM   #11
Tech Elite
 
blis's Avatar
R/C Tech Elite Subscriber
 
Join Date: May 2008
Location: Brisbane
Posts: 3,434
Default

Quote:
Originally Posted by Sambo 7 View Post
Yes when the glow plug is out and i pull the starter a mist comes out ?
Then you have fuel...

Best thing to do is disconnect the throttle linkage. Put a rubber band across the throttle and a fixed point on the car to keep it closed. Do the 1mm Idle gap and get it to fire first.. as in my link above.

I'd say too much idle open, check throttle linkage, radio throttle trim / sub-trim too.

LAST thing you want is for it to start and scream it's head off with too much idle, and use the rubber band ok!

ALSO, if it's a barrel carby, the idle screw sits in a slot, if that has twisted or slipped, might be worth taking a closer look at it.
__________________
RC Cars: E4/G4/TCX/LAB-C02/T4'15/MM Engines
WEB: Beachmums Racing - MYRCM Race Registration
Media: Amain - RCRacingTV - RedRC - LiveRC - blisx264
blis is offline   Reply With Quote
Old 11-10-2012, 07:03 PM   #12
Tech Master
 
Geezatec's Avatar
 
Join Date: Oct 2007
Posts: 1,460
Default

Quote:
Originally Posted by Geezatec View Post
If you have a duel rate wheel on your TX turn it down. It changes the throw on the throttle servo.
Misquoted Duel rate wheel. Throttle Trim on your TX, It'll close your air gap to .5 to 1mm. If idle screw doesnt make a differance. Turning idle screw should be turned CCW to lower idle speed and close throotle air gap.
Geezatec is offline   Reply With Quote
Old 11-10-2012, 07:14 PM   #13
Tech Rookie
 
Join Date: Nov 2012
Location: QLD Australia
Posts: 16
Default

Ok thankyou
Sambo 7 is offline   Reply With Quote
Old 11-10-2012, 08:09 PM   #14
Tech Rookie
 
Join Date: Nov 2012
Location: QLD Australia
Posts: 16
Default

Still no go
Sambo 7 is offline   Reply With Quote
Old 11-10-2012, 09:38 PM   #15
Tech Elite
 
blis's Avatar
R/C Tech Elite Subscriber
 
Join Date: May 2008
Location: Brisbane
Posts: 3,434
Default

Quote:
Originally Posted by Sambo 7 View Post
Hey I have a nitro road car with a fs12 sw engine in it with a tamiya chassis and i cant get the car to start ! The only way it will start is if i pull the glow plug out and put fuel down the carby then it will start first time and run for a few seconds, Would anyone be able to help me ? Thankyou!
Does it accelerate to a stop when you do this? Or does the engine stall ?
__________________
RC Cars: E4/G4/TCX/LAB-C02/T4'15/MM Engines
WEB: Beachmums Racing - MYRCM Race Registration
Media: Amain - RCRacingTV - RedRC - LiveRC - blisx264
blis is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 11:05 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net