Husaberg
Go Back   Husaberg Forum > Mechanical and Technical > Fuel

Fuel Fuel Delivery


Reply
 
LinkBack Thread Tools Display Modes
December 25th, 2010, 01:36 PM   #1
Senior Member
 
Joined: Dec 2009
From: Skidaway Island GA

Posts: 274
Thanks: 21

I Ride: 2010 FE450
Back firing through exaust when COLD starting...08 FE450

Ok, just so that y'all know I DID go through the owners doc, previous posts, etc. before starting this topic.

When cold starting (below 30 degrees hey I live in MN!!) I have a loud scary back fire through the exhaust when using the e button. If I push on with the starter and twist the throttle I can get it started but I know that's not right and don't want to risk damge, so I need some advice please.

I have synthetic oil in (10W50 Amsoil) and would like to change it to 5W if I can get it started
Plug good, compression good, valves checked (I set them this fall), spark good, fuel 91 with Seafoam, I use the de comp lever to find TDC then give it a good kick as best I can I'm on the short lite weight side since I'm a chick with a Husaberg!! It does turn over great with the e start but I give it a break after a while and when it starts Backfiring I do clear out the spent fuel in begining with de comp lever in and clutch in.

What Am I doing wrong? FYI I NEVER have trouble starting it off the e button in milder weather and it runs awesome, no bog, no backfiring etc. Also notice that the clutch drags when it's this cold and when I try to break things loose but putting in 2nd and bumping it the rear wheel just skids.
LadyBerg is offline  
 
December 25th, 2010, 01:53 PM   #2
Senior Member
 
Joined: May 2002
From: Snowy Mountains NSW Australia

Posts: 1,587
Thanks: 127

I Ride:
Re: Back firing through exaust when COLD starting...08 FE450

Dunno about the backfiring, but probably just a gutfull of fuel. I know my Bergs with 15/40 are a pain to kick over below about 8 deg c, ie mid high 30s f. I try and park them in the sun, or by the fire to get some heat in them before kicking them in these conditions. I've also put a fan heater on them in the shed to warm the sump up. Thinner oil is the go I feel. And use of the button will result in a mechanical problem in these conditions I reckon.

You could do an oil change cold, just let it drain overnight and then put the thinner stuff in, then do another change normally later.

I can't recommend a thinner oil, but there are plenty here who can.

Steve
steve is offline  
December 25th, 2010, 09:53 PM   #3
Senior Member
 
husabutt's Avatar
 
Joined: Feb 2003
From: Escondido, Ca. USA

Posts: 3,058
Thanks: 316

I Ride: 2005 Fe450,2001 Fx470,1997 Fx600
Re: Back firing through exaust when COLD starting...08 FE450

In cold weather gasolines use a higher vapor pressure blend (winter blend) to help atomize the fuel. You may want to research some of the available racing fuels in your area and find out which one has the highest vapor pressure comparing that to the pump gasoline vapor pressure.

In summer a high vapor pressure fuel would cause vapor lock and conversely a low vapor pressure fuel will cause difficult starting in the winter by flooding the engine with wet gas.

Winter gasoline blends are phased in as the weather gets cooler. You may benefit from just obtaining some fresh and latest winter blend gas from a high volume gas station.
husabutt is online now  
December 26th, 2010, 08:09 AM   #4
Moderator
 
ned37's Avatar
 
Joined: Dec 2004
From: back in cottonwood, az

Posts: 2,313
Thanks: 195

I Ride: '08 HUSKY te610
Re: Back firing through exaust when COLD starting...08 FE450

when i had my '04 450, i would have to readjust the pilot fuel screw about a half to 3/4 turn out (richer) in the cold and back the other way when it warmed up. out here in the winter, that could be week to week. pretty much applies to my other bikes as well.
ned37 is offline  
December 26th, 2010, 09:26 AM   #5
Senior Member
 
Joined: Dec 2009
From: Skidaway Island GA

Posts: 274
Thanks: 21

I Ride: 2010 FE450
Re: Back firing through exaust when COLD starting...08 FE450

Husabutt, The bike has winter blend in it now (I used to work for Conoco ages ago). We start winter blends early since it's always so COLD here in the Northland. I suppose it wouldn't hurt to drain gas and dump in fresh yummy gas. I could put the old gas in the ATV's they burn anything and with FI they always start!

Ned, I'll check on my pilot jet setting...does this mean I'll have to pull the carb?

Thanks guys for the help, Colleen the Husaberg Lady
LadyBerg is offline  
December 26th, 2010, 09:29 AM   #6
Senior Member
 
Joined: Dec 2009
From: Skidaway Island GA

Posts: 274
Thanks: 21

I Ride: 2010 FE450
Re: Back firing through exaust when COLD starting...08 FE450

Ned37, Do you mean the FUEL MIXTURE SCREW, next to the idle speed knurled knob? That was my next check to see how lean that was set. Looks like stock setting is 1 1/2 to 2 turns out. I was going to try this when I went back up to NW WI this next week.
LadyBerg is offline  
December 26th, 2010, 09:52 AM   #7
Senior Member
 
husabutt's Avatar
 
Joined: Feb 2003
From: Escondido, Ca. USA

Posts: 3,058
Thanks: 316

I Ride: 2005 Fe450,2001 Fx470,1997 Fx600
Re: Back firing through exaust when COLD starting...08 FE450

Pilot fuel screw = Fuel mixture screw, found on the bottom of the fcr carb. If the screw has not been replaced with an aftermarket item you may have to purchase one or the special tool to adjust it.


http://www.pbase.com/jdjetting1/image/52684432
husabutt is online now  
December 26th, 2010, 10:16 AM   #8
Senior Member
 
Joined: Dec 2009
From: Skidaway Island GA

Posts: 274
Thanks: 21

I Ride: 2010 FE450
Re: Back firing through exaust when COLD starting...08 FE450

I'll bet it's accessible, this bike was a GNCC bike b4 I got it and the 2009's came out so they ran the new bikes. It has a lot of nice bits on it! I do think that I'm LEAN on choke when I try starting it...esp. COLD and that when I pump in more gas via throttle I can get it started but then the Backfire which is a no no.
LadyBerg is offline  
December 26th, 2010, 12:46 PM   #9
Moderator
 
ned37's Avatar
 
Joined: Dec 2004
From: back in cottonwood, az

Posts: 2,313
Thanks: 195

I Ride: '08 HUSKY te610
Re: Back firing through exaust when COLD starting...08 FE450

here is a pic of my '04 with a zip-ty(?) aftermarket pilot fuel screw. if you don't have one, there will just be a hole with a screw slot inside. (you can get to it with a very short small screwdriver, but its a pain)
the other pic is an aftermarket next to a couple of stock screws.
[attachment=0:2l9jamkx]bergstarters (1)a.JPG[/attachment:2l9jamkx]
[attachment=1:2l9jamkx]fcr fuel screws (1).JPG[/attachment:2l9jamkx]
Attached Thumbnails
Back firing through exaust when COLD starting...08 FE450-fcr-fuel-screws-1-.jpg   Back firing through exaust when COLD starting...08 FE450-bergstarters-1-.jpg  
ned37 is offline  
December 26th, 2010, 02:27 PM   #10
Senior Member
 
Joined: Dec 2009
From: Skidaway Island GA

Posts: 274
Thanks: 21

I Ride: 2010 FE450
Re: Back firing through exaust when COLD starting...08 FE450

Ned37, Yep I'm clear where the fuel mix screw is, but pics help! Looks like a common FCR/upgrade and I'll pick one up tomarrow at my local shop. Thanks you guys rock
LadyBerg is offline  
Reply

  Husaberg Forum > Mechanical and Technical > Fuel

Tags
back, cold, exaust, fe450, firing, starting08



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Back firing on the over run Komatias Mechanical 16 November 24th, 2009 12:44 PM
Back firing when hot starting. Coastie Electrical 15 June 7th, 2008 05:32 PM
501 cold weather starting Bucklee Fuel 13 February 12th, 2007 12:35 PM
Starting with choke only, hot or cold. kzoo Fuel 22 November 22nd, 2006 10:50 AM
HELP: very hard starting when cold! Proemer Mechanical 15 November 18th, 2004 06:01 PM


Facebook Twitter Google+ RSS Feed