Husaberg
Go Back   Husaberg Forum > Mechanical and Technical > Mechanical

Mechanical Mechanical Forum - spinning bits and gyrating bobs


Reply
 
LinkBack Thread Tools Display Modes
June 28th, 2005, 05:33 AM   #1
Junior Member
 
fc501nor's Avatar
 
Joined: Jun 2005
From: Norway

Posts: 8
Thanks: 0

I Ride:
Backfiring..

I wonder if the following is normal:

When i drive the bike (fc501) with normal gas, it runs without any backfiring, it also doesnt backfire at idle. and i can also give pretty much throttle and go off the throttle without backfire.

But when I give it full throttle and let it rev up on rpm pretty much and releases the throttle I can sometimes hear a couple of backfire..

is this normal ? what can i do to solve the problem?
fc501nor is offline  
 
June 28th, 2005, 05:51 AM   #2
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,182
Thanks: 365

I Ride:
possibly running lean. put your jets in coca cola overnight and see if that helps or turn the mixture screw out a 1/4 turn.

regards

Taffy
Taffy is offline  
June 28th, 2005, 06:22 AM   #3
Junior Member
 
fc501nor's Avatar
 
Joined: Jun 2005
From: Norway

Posts: 8
Thanks: 0

I Ride:
backfire

I have turned the mixture screw all way in, and 2,5 turns out.
is this ok? I will look at the colour of the spark plug today..
it should be brown right?
fc501nor is offline  
June 28th, 2005, 08:03 AM   #4
Senior Member
 
Joined: Aug 2003
From: Chandler, AZ, USA

Posts: 517
Thanks: 0

I Ride:
Oooo man did you blow it now!!!

Taffy is gona give you the "Nanny 911" lashing and put you in the naughty chair for 1 hour!!

It will go something like this, " Never pull the plug..... Never, never, never, never.......... NEVER!!!


HAD TO DO IT.......

Laters,
sandskipper is offline  
June 28th, 2005, 08:46 AM   #5
Junior Member
 
fc501nor's Avatar
 
Joined: Jun 2005
From: Norway

Posts: 8
Thanks: 0

I Ride:
hmm

what? you cant blow a engine by looking at the spark plug, or turning the mixture screw....
fc501nor is offline  
June 28th, 2005, 09:47 AM   #6
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,182
Thanks: 365

I Ride:
no problems looking at the plug with a SEM ignition. if you think you really can learn a lot from it then do....some people just nnnneeeevvvveeeerrr listen!

me? i have the leanest jetting in the world and the plug is still brown-so go figure that out.

regards

taffy
Taffy is offline  
June 28th, 2005, 10:10 AM   #7
Senior Member
 
Joined: Mar 2005
From: Mesa, AZ

Posts: 2,713
Thanks: 3

I Ride:
Idle jet may be too lean. My own experience but it was on a Suzuki, so what do I know.
LeFrog is offline  
June 28th, 2005, 10:46 AM   #8
Junior Member
 
fc501nor's Avatar
 
Joined: Jun 2005
From: Norway

Posts: 8
Thanks: 0

I Ride:
jet

how big should the main jet be on a 96 fc501 with ported head and 38mm dellorto flatslide and laser exhaust?
fc501nor is offline  
June 28th, 2005, 11:03 AM   #9
Junior Member
 
fc501nor's Avatar
 
Joined: Jun 2005
From: Norway

Posts: 8
Thanks: 0

I Ride:
jetting

I had a bmw 325i before, which I turbocharged. I did 0,5bar pressure on a standard engine without anything else but a progressive fuel pressure regualtor. The colour of the sparkplugs became grey... so i inserted a map fueler 2 system with 2, 500ccm jets. Then i got the right brown color..

So dont say you cant se something about the mixture by looking at the spark plugs..
fc501nor is offline  
June 28th, 2005, 11:43 AM   #10
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,182
Thanks: 365

I Ride:
i don't know what tone you had to the last comment but i'll take it that i'm misunderstanding you.

fact is mate, you can't get a colour with the kokusan ignition. ok?

and as for your jetting, well it's very kind of you to tell us much, much later what you've done to the engine and exhaust...

without knowing what's in it now i wouldn't hazard a guess but what i would perhaps do is try and interpret the noises and feel.

going by the plug colour on a nine year old bike is possible but it isn't plausable.

Taff
Taffy is offline  
Reply

  Husaberg Forum > Mechanical and Technical > Mechanical

Tags
backfiring



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
FE 570 backfiring on decel 1Trak Mind Fuel 7 November 17th, 2011 06:28 PM
09 intermitent backfiring gerhartBerger Fuel 1 April 26th, 2009 06:39 PM
backfiring Bladeothous Fuel 3 February 15th, 2009 12:37 AM
major popping/backfiring McMucker Husaberg 19 January 5th, 2006 04:56 PM
hi/lo backfiring. 600mad Husaberg 1 August 3rd, 2005 05:34 AM


Facebook Twitter Google+ RSS Feed