Husaberg
Go Back   Husaberg Forum > Mechanical and Technical > Fuel

Fuel Fuel Delivery


Thanks Tree1Thanks
Reply
 
LinkBack Thread Tools Display Modes
February 7th, 2018, 12:46 AM   #1
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 16,200
Thanks: 532

I Ride: Husaberg FE501e 2003
FE501e 2001-2003 Performance Jetting Kit

Hi

I have been working on a performance jetting kit for my bike which is a well set up FE501e 2003. It has my jap rod in it for testing and until now just the 'easystart kit' for ease of starting.

recently i changed a lot on the carb and the PJ was forced up into the 50s! and the bike absolutely flew! it turns out that these bikes are screaming for huge PJs, but only if you make 4 changes to PJ, slide, atomiser and needle.

by changing the atomiser, slide, choke, PJ twenty times etc etc I now have a weapon! there isn't much 'snorting' through the carb now either, the engine is creamy rather than harsh and it devours revs.

the kit is 108 in the EU and 90gbp outside. I'm looking for owners now to test the kit on their bikes. so i know that the state of engine, poor fuel in the USA, altitude, ignition timing and most of all; 'valve clearances.....' will all play a part! it'll be enough getting these things right.

starting is first time all the time. that is now a 'given'.

so sticking with 501s 2001-2003 will be enough.

after this, nobody will pay $500 for Keihin FCR again. the difference at low revs where all the dirt boys play is huge. I say 'huge'. that is a big statement....

there will be instructions and i'll work 1 to 1 work with the first owners trying this so please contact me and let's get these dell orto's rolling!

Steyel? where are you!

regards

Taffy

Last edited by Taffy; February 7th, 2018 at 12:53 AM.
Taffy is offline  
 
February 9th, 2018, 07:54 AM   #2
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 16,200
Thanks: 532

I Ride: Husaberg FE501e 2003
2 days, 2 sets going out.

yippee!!

taffy
Taffy is offline  
March 16th, 2018, 02:01 AM   #3
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 16,200
Thanks: 532

I Ride: Husaberg FE501e 2003
anybody else with one of the 2001-2003 501s?

looking to spread the news and get some feedback here.

regards

Taffy

Last edited by Taffy; March 17th, 2018 at 12:39 AM.
Taffy is offline  
April 19th, 2019, 12:32 PM   #4
Junior Member
 
Joined: Feb 2019
From: Payson Arizona

Posts: 1
Thanks: 0

I Ride:
2003 501fe carb kit

Hey taffy I would love to try one of these kits. I have a 2003 501fe with an Inop electric starter but plan on getting the gear assembly from you soon. However being here in AZ,USA at 5500 ft my berg is a pain in the foot(ass) to start when hot most the time I can't get it started. Let me know what is needed from me so I can get one of the easy start kits. Thank you
CBlank111 is offline  
April 20th, 2019, 02:05 AM   #5
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 16,200
Thanks: 532

I Ride: Husaberg FE501e 2003
hey there....do we have any kind of name?

it is for sale in my webshop as 101222 or just put 'berg booster'. I have about 8 kits out now but no reports on it. Just one Englishman that said this week he can't set it up in an email. I will be working with him I hope so we have a happy clappy camper.

I write at this time, on the Easter saturday, the hope is to start testing again of a home modified needle and if all goes well, I will have it manufactured. but that is months away.

right now, I need others to have good results with it and prove that a (not so) competent Jetting Guru can get it to work. email me if you don't want to go through the shop.

make sure that your tappets are good, your air filter is clean and not over oiled, use an iridium plug, and after that we can say you've done your best!

Taffy
Taffy is offline  
April 14th, 2020, 02:27 AM   #6
Junior Member
 
Joined: Apr 2020
From: Australia

Posts: 1
Thanks: 0

I Ride:
Hi Taffy,

I have a 2003 FE501E as well and I love it. Have had it about 6 years. Proper pig to start. Have to kick 6 or 7 prime kicks then it will fire for a bit. Same process about 4 times and she will run. Dellorto carb has quite a bit of wear between slide and barrel wall, so my assumption is that it is knackered. barrel wall is scored/scuffed.

Am just getting back to riding it and at 52 don't have the patience or strength to kick the bloody thing. E Start system works fine however will not start the bike.

Valves and cam are new and set to 0.10mm.

Would love to know where to get another Dellorto from as I would like to keep it as standard as possible. Bit of a purist....

Appreciate some help please as it seems that you have yours firing well.

Thanks heaps.
Nathan Crosby
NCroz is offline  
April 14th, 2020, 05:15 AM   #7
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 16,200
Thanks: 532

I Ride: Husaberg FE501e 2003
I just got 3 new brass slides. last ones left!

100390 in my web shop. 80.75 is about $105. but post is cheap at 8 so that makes up for it a bit.

look at the eeasy start kit if you want help starting it and my special choke cable.

Taffy
Taffy is offline  
July 3rd, 2020, 01:09 AM   #8
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 16,200
Thanks: 532

I Ride: Husaberg FE501e 2003
Having continued work on the jetting until last April, I finally stopped having altered that tiny air jet on the left as you look at the front face of the carb.

that was the last thing I did at the time. by lowering that jet I was able to reduce the air going in and pulling on the pilot jet (PJ) and numbers came down fast.

anyway, this could only be done with some kind of incremental jetting system so the old brass ring was removed and a pair of holes drilled and threaded for both the Pilot Air circuit and the Main Air Circuit. So with the help of my engineer, I had regular Dell orto 5mm PJs turned down a little and they fit JUST inside the O ring running round the underside of the Air Filter Adapter (AFA).

I think I could have used a better jetting system and stolen some small jets from Keihin or Mikuni. The hole is 4.0-4.2mm and both the above make 4mm jets. I'll see if there isn't enough contact are to thread them in.

So with the smaller PAJ I was able to reduce the PJ and the slide cutaway height which meant I could reduce the PJ some more and in the end the numbers were very low and still the bike ran well.

THERE ARE OVER 20 KITS OUT THERE NOW WITH FE501e OWNERS. all I hope enjoying the ride!

anyway, about 2 Months ago, under lockdown I kept thinking about a nagging little vibration at 2mm of throttle that I have never been able to get rid of. whether the 58PJ was fitted or the 38PJ, those of you running a roundslide Dell Orto will know it; a small mmmmmmmm drrrr mmmmmmmmm.

So, I started to think of how I might get rid of it and started testing again only last week. I was forced into changing away from the DR atomiser at the same time as I tried a new atomiser bush. I'll let you know when it is complete but it has been brilliant!



Please note; in the second photo a Dell orto mistake. they supply Fuel Valves with various fibre washers. there is no telling what they will put in a kit but unfortunately they are usually 1mm thick fibre washers and should be around 0.6mm. They do make 0.6mm and sometimes I'll even get a FV with them in but nobody knows what they will get. Notice the Brass arm is a long way from the correct angle. This will ruin your jetting on its own.

Taffy
Attached Thumbnails
FE501e 2001-2003 Performance Jetting Kit-dell-orto-paj-maj.jpg   FE501e 2001-2003 Performance Jetting Kit-paj-maj.jpg  

Last edited by Taffy; July 3rd, 2020 at 01:34 AM.
Taffy is offline  
July 6th, 2020, 11:07 AM   #9
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 16,200
Thanks: 532

I Ride: Husaberg FE501e 2003
Having last week changed the atomiser bush I thought I'd share with you what it is. photo 1.

this has created a windbreaker and with an AB/AR atomiser I have a bike that won't stall.

this was one helluva leap but was worth it. after 3 nights of testing last week I was back to level with the old DR atomiser system.

If you look, the thread for the AR and AB atomisers (see the second photo) is BELOW the hole through the angled atomiser bush. this means that air comes in the front face of the carb through the 6 0' clock hole (see the right hand hole in my previous post here) and goes through the bush hole and up the outside of the flue on the AB/AR atomiser. this is exactly what the MAJ hole was designed for. for the air to enter and go UPWARDS and it bleeds off the MJ from maximum power to the redline helping create power between the max. power and the redline. the longer and better it does this the better the 'overrev' is.

sadly, with the DR atomiser the air enters through the original flat-topped atomiser bush hole, the threaded area is ABOVE the port hole so the air goes DOWN and airates through the tiny holes in the DR atomiser (DR is on left - note the highest tiny holes).

the fuel sits above all the little drilled holes but momentarily goes down as the throttle is opened air then gets sucked through the tiny bleed holes leaning the mixture off.

a second disadvantage of the DR atomiser is that when air goes across a level hole there is a vacuum formed over the hole to suck up fuel but there's also an increase in pressure on the trailing edge stopping the fuel leaving the atomiser.

imagine a ping-pong ball in the atomiser. as it gets sucked to the top - it can't actually leave?

there are many ways of protecting the bush but the windbreaker system is the best and look how Keihin do it..... The AR/AB atomiser exit is flat on the bottom (just like the Keihin shown) and so is the DR but, it has a shroud above and it has, as mentioned above, no air wrecking the pick up in the base area.

so I now have a knock out steady idle.

Next report is of the work on the needle...............

cheers

Taffy
Attached Thumbnails
FE501e 2001-2003 Performance Jetting Kit-atomiser-bush-bishops-mitre.jpg   FE501e 2001-2003 Performance Jetting Kit-dr-ab-ar-atomisers-phm-carb.jpg   FE501e 2001-2003 Performance Jetting Kit-5mm-atomiser-shroud.jpg  

Last edited by Taffy; July 6th, 2020 at 11:15 AM.
Taffy is offline  
July 10th, 2020, 12:19 AM   #10
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 16,200
Thanks: 532

I Ride: Husaberg FE501e 2003
Attached are two photos. one is of the standard route that air takes around past the choke jet.

Dell orto supply choke jets from #40 all the way up to #155. It is difficult to imagine a #155 but the size of that bypass hole tells you that it was made for any such jet and not for the lower end.

All 'Easystart' and 'Bergbooster' kits use the smallest choke jet; the #40 which is one size down from that supplied to all round slide PHMs circa 2001-2003.

I have been experimenting with a faster air speed through a smaller hole but with no real effect.

back in 2002 when I first got my bike; an FE400e, I did some jet testing but proved rubbish at it, I made little progress and life also got in the way. the problem was, you had to draw every needle yourself.

I did however, for one day, get a screaming choke start!!!!! this is what I'd like again.

has anyone any knowledge of what makes Jap bikes rev so hard when starting?

regards

Taffy
Attached Thumbnails
FE501e 2001-2003 Performance Jetting Kit-standard-choke-hole-dell-orto.jpg   FE501e 2001-2003 Performance Jetting Kit-modified-choke-hole-dell-orto.jpg  
Taffy is offline  
Reply

  Husaberg Forum > Mechanical and Technical > Fuel

Tags
fe501e, jetting, kit, performance



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
stator for fe501e 2001 jaclan Electrical 3 November 9th, 2006 10:11 AM
2001 FE501E Value rgrant Husaberg 3 September 9th, 2005 11:21 PM
Finally got the 2001 FE501E going again DaleEO Ride Reports 6 June 21st, 2005 09:00 AM
Jetting 2003 FE501e Splat Fuel 1 June 26th, 2004 11:25 PM
Casting number on rod of 2001/2 550 vs. 2001/3 501-2003 550? PowerFiend Mechanical 0 June 23rd, 2004 04:21 PM


Facebook Twitter Google+ RSS Feed