This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

FE650 -05 jetting with Akrapovic slipon

H

Husakraft

Joined Jun 2012
5 Posts | 0+
Sweden
Hi everyone!

I´m a new member on the forum and I would need some help please.

I have just fitted an Akrapovic slipon on my bike and I read though some topics regarding jettings with Akrapovic but I did´nt find anything about the Slipon, so I guess I´m unsure if I just could try a 165 fuel jet or something or if I´m better off with some jet and needle kit for a more comprehensive tuning of the carburetor.

The standard fuel jet is 160 which I'm using now, but I did'nt check the colour of the sparkplug before fitting the slipon and I think the enduro silencer restricts alot. I'm also using a Twin Air filter if it makes any difference so I really have no clue what to go for and I really can´t blast it wide open in this neighbourhood since I like to make a good impression being a new neighbour and all.

Has any one here found a nice base setting with this combo that can be applicable or would you think some minor tuning would do it? Is it worth getting a jetting kit anyway for this carb perhaps?
The temperature here is between 68-86 Degrees F if the weather is good.

/Janne
 
Sorry for not writing that. They are 38 idle jet (if this is the pilot jet) and OBDVT needle as in the EU standard models.
 
650 are very lean standard, it depends on sea level and temperature but if you fit any unrestricted exhaust system you should up your jetting at least a bit. I run a 45 pilot 185 main and the needle is 1 clip obove centre and it the needle you get in the kit to de restrict in australia. I've also run a needle from a Yamaha 450 I can't remember these numbers ??? I'm not sure. Orangeberg
 
ORANGEBERG said:
650 are very lean standard, it depends on sea level and temperature but if you fit any unrestricted exhaust system you should up your jetting at least a bit. I run a 45 pilot 185 main and the needle is 1 clip obove centre and it the needle you get in the kit to de restrict in australia. I've also run a needle from a Yamaha 450 I can't remember these numbers ??? I'm not sure. Orangeberg
Click to expand...

Hi John,

Do you know the kit needle profile, does it have any ID on it?.

Regards

Sparks.
 
with an akro I'd say 165-170 would be fine. the 38 might be a bit lean and a 40 should be fitted.

the needle is a very good one for off-road but not a road needle if you're being choosy

regards

Taffy
 
What is the needle in question Taff, you say it's good for off road but you don't make any reference to what it is.

Regards

Sparks.
 
Thank you guys! I went in the store today to get a 165 jet but they only had a 168 so I got that instead and ordered a 40 pilot just in case and luckily it seemed like the right way to go after reading your reply´s :D
It's a MX/enduro bike for now so I hope it's a good setting to start with, but now I know they can go alot higher with the jets. I got a new backtyre aswell and just can't wait to get to the track. I will be back with the results :)
Thanks again.
 
sparks said:
ORANGEBERG said:
650 are very lean standard, it depends on sea level and temperature but if you fit any unrestricted exhaust system you should up your jetting at least a bit. I run a 45 pilot 185 main and the needle is 1 clip obove centre and it the needle you get in the kit to de restrict in australia. I've also run a needle from a Yamaha 450 I can't remember these numbers ??? I'm not sure. Orangeberg
Click to expand...

Hi John,

Do you know the kit needle profile, does it have any ID on it?.

Regards

Sparks.
Click to expand...
I have it at home but I'm away at the for work moment, obvtr maybe???? The Yamaha part I have at home as well and I did run it at Finke desert race years ago.im home Friday
 
Husakraft said:
Sorry for not writing that. They are 38 idle jet (if this is the pilot jet) and OBDVT needle as in the EU standard models.
Click to expand...

DVT sparks? good needle.

regards

Taffy
 
ORANGEBERG said:
sparks said:
ORANGEBERG said:
650 are very lean standard, it depends on sea level and temperature but if you fit any unrestricted exhaust system you should up your jetting at least a bit. I run a 45 pilot 185 main and the needle is 1 clip obove centre and it the needle you get in the kit to de restrict in australia. I've also run a needle from a Yamaha 450 I can't remember these numbers ??? I'm not sure. Orangeberg
Click to expand...

Hi John,

Do you know the kit needle profile, does it have any ID on it?.

Regards

Sparks.
Click to expand...
I have it at home but I'm away at the for work moment, obvtr maybe???? The Yamaha part I have at home as well and I did run it at Finke desert race years ago.im home Friday
Click to expand...

Hi John,

Would the needle in question be a DVR or the EMR?.

The Yamaha needle I know, CVS, CVR.

Regards

Sparks.
 
Hi again! The 168 main jet did the trick for sure, now the bike is running and sounding as it should when revving it :D allthough it might handle an even bigger main jet as I havent checked the sparkplug yet.
It will probably need some more tuning on the pilot jet anyway, I always thought the bike had some lag of the power even as standard and maybe it´s normal if the engine need some revs to hit, but on idle it will now almost stall when you hit the throttle really quickly so I was thinking if a Boyesen Acc-pump or similar with an adjusting screw could be a good upgrade, or should a correct pilot jet alone fix this?

I have seen some dyno graphs that shows this engine pulls really evenly but they did´nt show what happens below 4000 rpm´s. How are these supposed to pull nice even from really low revs?

I am actually really happy with how the engine is running even when riding now so I know I´m missing out :lol: but I´d like to know what to aim for power curve wise.

And by the way, how important is the air screw setting regarding stalling when you hit it at idle, or is it just for the fuel mix at idle?

I will get a kit with different sizes of jets and get started with a proper tuning.
I read that you aslo should set the ignition timing specifically, but maybe that´s another topic, if there is´nt one already.
Thanks!
 
the 'air screw' as you call it is actually the pilot screw because it regulates fuel and air AFTER they have mixed!

yes that will stop the bogging. half a turn either way....

regards

Taffy
 
Ok great, but only on the really lows right? Then the pilot jet take over and the air pilot affects the ratio curve if I remember correctly. My 125cc 2-stroke was much easier to tune as I could both hear and feel clearly if the air fuel ratio was off. I hope I will learn to do the same with the Berg, it´s worth the effort for sure :)

I will adjust the pilot screw. I guess the squirt from a acc pump is for a too short duration anyway and can´t be much of a substitute for anything.

When I´m done with the preliminary settings I will make a dyno test on the bike. I might even get to make a few changes on the carburetor while the bike is on the bench since the shop manager is an acquainted. I will keep posting results if it´s of use to anyone else.

Thank you!
 

Similar threads

D
For Sale Parting out my 2001 FE650e
Replies
6
Views
560
Danger666
D
S
For Sale 2002 fe650
Replies
6
Views
2K
FraserThompsom
FraserThompsom
Taffy
New - improved carb needle 2004-2008
Replies
3
Views
2K
FlyingZebra
FlyingZebra
S
Spencer's fs/fe 650
Replies
5
Views
2K
o6550
o6550
Sandtorven
2001 FE650E with tuned engine - Need some expertise!
Replies
0
Views
989
Sandtorven
Sandtorven

Register CTA

Register on Husaberg Forum! This sidebar will go away, and you will see fewer ads.

Recent Discussions