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electro9

DRZ400e '2000 FCR 39 Carb rebuild jetting

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Hi all!

 

I am new to this forum but will definitely drop by more often as I see tons of great stuff here.

 

Just got back from a trip from Poland to South Africa on a DR650SE which was a great bike and I loved it a lot, but had to sell it at the end. Now I bought a DRZ400e from 2000, but it needs some work before I start riding. The thing I am taking care of at the moment is the carb - I am rebuilding it but never worked on Keihins and am quite confused. I have searched the forum and found a lot of jetting advise, but am not experienced enough to choose the right setup. Could you please advise on jetting for the carb?

 

DRZ400e 2000

stock Keihin FCR 39 (not MX)

drz400e stock pipe with the baffle still in the muffler

air box with the rubber restriction removed

elevation ca. 1000 ft above sea level

 

These are the jets I have at the moment:

PILOT AIR JET - 60

MAIN AIR JET - missing (ordered standard 200)

MAIN JET - 165

PILOT JET - where is it?! Not next to main jet as in the FCR 39 MX

NEEDLE - OBDX P 4th clip from the top

FUEL SCREW - 2,5 turns out

 

Have not tried it on the bike because it is dismantled and I am waiting for the MCCT. But would like to know is there a chance that this setup will work for me or should I get some other jets (would like to avoid it though as am low on funds after my trip)

 

I will really appreciate your help.

Thanks!

Edited by electro9

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Hi!

 

I know that I am a new member of this forum, but would really appreciate some advice from experienced DRZ users.

I promise to give the knowledge back and reply to the posts regarding things that I have more experience than FCR jetting :-)

 

Thanks!

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These are the jets I have at the moment:

PILOT AIR JET - 60-----OK  There is also a 90 air jet in the coast enrichener system that works with 60 air jet.  Effectively a 100.

MAIN AIR JET - missing (ordered standard 200)------Yes 200 is correct

MAIN JET - 165-------This is what Suzuki specifies with the rubber restrictor removed from the air box.  A 158 would be better

PILOT JET - where is it?! Not next to main jet as in the FCR 39 MX------ Yes next to the main jet pretty much.  The bowl needs to be removed for access.  45 is the correct size

NEEDLE - OBDX P 4th clip from the top.-------  That will work OK.  Move the clip to -5 (from the top)

FUELicon1.png SCREW - 2,5 turns out------OK.

 

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On a 13 year old fcr you may want to consider removal of the coast enrichener...Join he ports on the carb with a left over piece of hose and cap the port on the head..http://www.thumpertalk.com/topic/944289-bike-is-not-reving-outwhat-to-check-first/page__pid__9885029#entry9885029

 

I have used the following set up with good results...

with snorkel removed , at near sea level

160 main jet...(not stock)

200 main air jet..(stock)

60 pilot air jet ..(stock)

OCEMN needle, clip 3...or JD needle,clip 4 ...or stock OBDXP needle ,clip 5...(in order of preference)

45 pilot jet..(stock)

2.25 turns fuel screw..

 

fitting an R&D Flexjet remote fuel screw will enable easy fine tuning of the pilot circuit, a standard extended fuel screw will have clearance issues...

 

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Wow! Thanks guys!

As far I can see, to make it running with minimal cost I should move the needle to 5th clip and get a smaller (158-160) main jet.

The altitude I'm riding at is higher, so also 165 MJ seems to be a little to large. I will order the jet and hope it works just after basic FS tuning.

Will also.take a look at the coast enricher.

 

Thanks a lot!

Regards.

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Wow! Thanks guys!

As far I can see, to make it running with minimal cost I should move the needle to 5th clip and get a smaller (158-160) main jet.

The altitude I'm riding at is higher, so also 165 MJ seems to be a little to large. I will order the jet and hope it works just after basic FS tuning.

Will also.take a look at the coast enricher.

 

Thanks a lot!

Regards.

 

Needles are not expensive....http://www.jetsrus.com/individual_parts/017_262_su.html

You can get main jets here as well....http://www.jetsrus.com/a_jets_by_carburetor_type/jets_keihin_99101-357_main_Hex_25-xxx.htm

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When I remove the bowl I have the main jet in the middle and two holes on both sides. I have the jet in just in one of them and it's the .65. Is this the pilot jet and there should be another jet at the other side of the main jet?

 

If the .65 is the pilot jet, it's way over the standard specs. Will this affect my idle and low throttle performance a lot?

 

Cannot find an aftermarket one here (I am located in Poland) and ordering one from jetsrus would take ages and cost fortune for shipping. In case it really should be changed I'll order one from suzuki (which is not cheap either). I hope that I'm not missing another one...

 

Thanks!

Edited by electro9

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It has been some time since I had a FCR slant body apart.  The pilot jet may be down in a hole, can't remember.  The mind is the first thing to go you know. At least I think that is what I was told.  In a moment of clarity - Yup down a hole opposite side from the starter jet.

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Hi All,

 

I would like to share my experience, maybe somebody will find it useful someday. My final setup for a DRZ400E with stock muffler and airbox limiter removed is:

 

160 main jet

200 main air jet

60 pilot air jet

OBDXP needle, clip 5

45 pilot jet

1.75 turns fuel screw

 

I do not have an extended fuel screw. But after a while I have found a way to turn that bloody thing without taking the tank off and disconnecting everything. All I did was unscrewing the rubber sleeves on both sides of the carb, then pushing the airbox-side sleeve towards the airbox which gave me some room to move the carb towards the airbox without disconnecting the cables and tubes. Then I could use a flat bit to turn the fuel screw. Adjusting on the running engine still not possible this way but at least didn't have to dismantle half of the bike to check different settings.

 

Thanks for help!

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