What is the default jetting for a 1997 Fe400

Anybody have the info?

I only have access to the 1999 manual and as far as I can see the 1999 comes with a different carb than the 1997.

The only thing I can tell you is the 1997 FE400 came with a Dellorto PHD 38mm Flatslide (all other larger displacement models came with a 40mm roundslide). $8911.00 1997 dollars, Yikes! :eep:

Dellorto jetting

Hi, spakur....
My '98 owners manual shows a Dellorto VHSB-38 as the OEM carb. This website Motorcyclecarbs Dellorto VHSB info has parts and specs. They may also have info on the OEM jetting.

Thanks for the info.

I have been reading the parts manuals a bit and found that the standard jetting for the FE400 (1989-1998) is:

Throttle: 55
Mainjet:185
Pilotjet:33
Startjet:50
Float Needlejet: 350
Float:4.5g
Needlejet:FN260
Needle:K32 or K35

The parts manual lists two needles (K32,K35), but doesn't specify witch one is standard.

I have pretty much the same jetting except for the Float (3.5G), needlejet (FN258) and needle (K51).

I Have the OEM exhaust, but I am thinking that a previous owner perhaps had another exhaust and therefore changed the jetting. I am having some problems to start the bike when it is hot. When the bike is cold there is never a problem to start it, but I never need to use the choke either, which is a bit strange I think.

As far as I can read this figures, a previous owner has changed the floats to lighter ones which makes the float chamber contain less fuel. He has also changed the needlejet to a narrower one. And finally he has changed the needle. However I have no idea what the difference is between the needles. Anyone can explain the different numbers?

fe400 jetting

Hi, spakur....
Check this out : http://www.husaberg.org/modules.php?nam ... =5463#5463, and this http://www.motorcyclecarbs.com/jetting/carbs101.pdf . You may have already seen the carb101; if not, it has very good jetting info!!

spakur said:

I am having some problems to start the bike when it is hot. When the bike is cold there is never a problem to start it, but I never need to use the choke either, which is a bit strange I think.

Click to expand...

Hi Spakur:

It seems that you may benefit from decreasing the size of your pilot jet a bit and perhaps trying splats recommendation:

Splat said;
My bike was finicky starting when new. Berger suggested (while we were out riding) that I try lowering the needle 1 notch. He had a similar starting problem with his bergs, which the needle affected. So I figured 'Why not try it?' I raised the clip (lowered the needle) and the next day the bike did start better. I know it contradicts all logic. But it worked on Berger's bikes and it helped on mine.

You could add a hot start system which will lean out the mixture to make it easier to start when hot. Take a look at this:

The hot start is a device that lets a small bit if filtered air into the engine while the button is activated, to lean the fuel mixture so the bike will start easier. A four stroke needs to be set a little on the rich side for good throttle response and good power. This rich mixture can make a hot four stroke absolutely refuse to start if stalled. This is known by some as a "flame out". The hot start allows optimum jetting to be run without worry of the dreaded flame out. A hot start can be added to most any four stroke that doesn't come with one from the factory. Stroker Racing sells a kit to add one to a KLX. This requires drilling a hole in the intake manifold and adding a small vacuum fitting for the air intake. This isn't a big job and has some obviously huge benefits. Some people even use this as a tuning aide to help determine if the jetting is too rich or too lean in a certain rpm range. By activating the hot start in the suspect rpm range, and monitoring the quality of running change, one can determine if the base mixture/jetting needs to be addressed.

I don't think many Berg owners have added this device though. If jetted properly they should start with the choke on and no throttle without too much trouble. When hot, no choke and no throttle. should start very easy when warm.

If the needle was changed to a richer one dropping the needle by raising the clip may help avoid changing the needle to a leaner one too.

I would start by dropping the pilot jet one size and see what happens.

From the Mikuni site:

1) When the throttle valve is in the idle position, fuel does not flow out of the main system (needle, needle jet, main jet). Fuel is only delivered to the engine by the pilot (idle) system.

The manual I got with my 97 FC 501 which I think is a 98 manual but is slightly different to the one on here lists the FE 400 jetting as

Main 190
Needle jet DR 270
Needle K35 clip #2
Pilot 52
Throttle 50
Float valve 300
start jet 45
and 2 turns on the mixture screw

this jetting may be specific to the bikes that were sold in New Zealand

Thanks again folks!

Now I have some ideas what to do...