Husaberg
Go Back   Husaberg Forum > Mechanical and Technical > Fuel

Fuel Fuel Delivery


Reply
 
LinkBack Thread Tools Display Modes
May 17th, 2006, 01:56 AM   #1
Junior Member
 
CUL8ER's Avatar
 
Joined: Jun 2005
From:

Posts: 17
Thanks: 0

I Ride:
Problem low rpm jetting on a fcr 41mm remade to 44mm.

Hey..
Have a question if anyone could answer it... we have made a 44mm carb out of a 41mm keihin carb with no tps on. But i have trouble to get it to run properly on low rpms. The big problem is that when i have put in the proper slow jet and turned in the fuel screw properly it idels great.. have rev meeter so i see the revs go down perfectly and stops there... but when you riding the bike, when you coaming in full speed into a corner and drop throttle of and start breaking its popping and banging like its way to lean.. so i had to put bigger slow jet in but then its to rich at idle and are hard to start... but dosent popping and banging when running...
Could this be a problem du to carb is 44 and you mabe need to change the slow air jet? If so is it a bigger or smaller slow air jet i need to test?

// Thx in Advance
CUL8ER is offline  
 
May 17th, 2006, 09:01 AM   #2
Senior Member
 
husabutt's Avatar
 
Joined: Feb 2003
From: Escondido, Ca. USA

Posts: 3,017
Thanks: 292

I Ride: 2005 Fe450,2001 Fx470,1997 Fx600
Re: Problem low rpm jetting on a fcr 41mm remade to 44mm.

Originally Posted by CUL8ER
Hey..
Have a question if anyone could answer it... we have made a 44mm carb out of a 41mm keihin carb with no tps on. But i have trouble to get it to run properly on low rpms. The big problem is that when i have put in the proper slow jet and turned in the fuel screw properly it idels great.. have rev meeter so i see the revs go down perfectly and stops there... but when you riding the bike, when you coaming in full speed into a corner and drop throttle of and start breaking its popping and banging like its way to lean.. so i had to put bigger slow jet in but then its to rich at idle and are hard to start... but dosent popping and banging when running...
Could this be a problem du to carb is 44 and you mabe need to change the slow air jet? If so is it a bigger or smaller slow air jet i need to test?

// Thx in Advance
I am nowhere near a carb guru, but........

I would be inclined to try using a slow jet that allows for proper starting but going as large as possible and also using the next richer slide. Since you have opened up the carb so much all of your settings will probably need to be richened to make up for loss of venturi signal.
husabutt is offline  
May 20th, 2006, 10:04 AM   #3
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,439
Thanks: 401

I Ride: Husaberg FE501e 2003
Re: Problem low rpm jetting on a fcr 41mm remade to 44mm.

cul8er

when the carb was bored did you make sure that you machined all 3mm off the top and 1.5 from each side? did you leave the bottom of the carb alone?

secondly, don't go by the popping and banging. you should have set the PS to the best snap wheelie position and THEN and only THEN do you worry.

if all was as you say, which i doubt (sorry but what do you wanna hear?) you need a leaner needle straight for re-starting when warm and idle. whatever your third suffix letter is - increase it so EKP needs to be EKR or EKS. if you gimme your code i'll check one out for you and the clip pocition.

regards

Taffy
Taffy is offline  
Reply

  Husaberg Forum > Mechanical and Technical > Fuel

Tags
41mm, 44mm, fcr, jetting, low, problem, remade, rpm



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
keihin fcr 41mm with jd kit problems hurtin albertan Fuel 31 July 31st, 2011 02:48 AM
FCR 41mm vs. 39mm k-dub Fuel 1 April 22nd, 2009 11:56 AM
FCR 41mm steup on a 470fc??? mikeoz18 Fuel 3 October 13th, 2008 11:13 AM
41mm FLatside Keihin on E-bay JoeUSA Fuel 7 May 4th, 2005 05:25 AM
Keihin FCR 41mm ? SHARFSCHUTZEN Fuel 2 November 2nd, 2004 06:09 AM


Facebook Twitter Google+ RSS Feed