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June 2nd, 2012, 06:16 PM   #1
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FE650 -05 jetting with Akrapovic slipon

Hi everyone!

Im 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 didnt find anything about the Slipon, so I guess Im unsure if I just could try a 165 fuel jet or something or if Im 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 cant 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
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June 2nd, 2012, 10:47 PM   #2
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Re: FE650 -05 jetting with Akrapovic slipon

What needle and pilot jet do you have ????
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June 3rd, 2012, 12:24 PM   #3
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Re: FE650 -05 jetting with Akrapovic slipon

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.
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June 5th, 2012, 12:00 AM   #4
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Re: FE650 -05 jetting with Akrapovic slipon

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
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June 5th, 2012, 12:54 AM   #5
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Re: FE650 -05 jetting with Akrapovic slipon

Mine is similar to John's but i run a 50 pilot and a 3 clip from top on kit needle.
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June 5th, 2012, 02:24 AM   #6
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Re: FE650 -05 jetting with Akrapovic slipon

Originally Posted by ORANGEBERG
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
Hi John,

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

Regards

Sparks.
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June 5th, 2012, 08:54 AM   #7
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Re: FE650 -05 jetting with Akrapovic slipon

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
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June 5th, 2012, 03:11 PM   #8
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Re: FE650 -05 jetting with Akrapovic slipon

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.
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June 5th, 2012, 03:25 PM   #9
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Re: FE650 -05 jetting with Akrapovic slipon

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 replys
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.
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June 5th, 2012, 10:17 PM   #10
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Re: FE650 -05 jetting with Akrapovic slipon

Originally Posted by sparks
Originally Posted by ORANGEBERG
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
Hi John,

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

Regards

Sparks.
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
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