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DRZ 400s with FCR39

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My DRZ400S have FCR 39 slant body and a complete exhaust from a DRZ400E with this jetting

160 main jet

48 pilot jet

stock DXP needle clip 4

2 turn fuel screw

This bike works good with this set-up

I make yesterday 2 others mods

1- DRZ400E cams

2- FCR 39 jetting whit TT set up

155 main jet

45 pilot jet

200 main air jet

100 pilot air jet

EMN needle clip 3

2 1/4 turn fuel screw

and i remove the coast enrichener

Whit this set-up the bike runs but it is less powerfull than my first mods (6-8 mph moore and better throttle response without E cams and my first jetting)

I rechek my cams timing and it's at the right place

What i do wrong with my jetting :smirk:

it's not the good jetting for my set-up ???

Give me answer to make me out of trouble

THANKS Pat

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I added E cams last week to my drz400s with the E header also (I also have a FCR-MX). I didn't notice much of a difference. I'm wondering if the E cams would like higher compression. Would higher compression move more air?

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The cams don't change compression ratio.I don't know the specs difference for the DRZ E and S cams but normaly a more performant cams give greater valve lift and duration opening

What's your FCR-MX jetting ?

I ride at sea level to 1500ft

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The cams don't change compression ratio.

but they do change the dynamic compression and affect cylinder pressure.

post a picture of the cam timing from the sprocket end with the tdc mark lined up in the window.

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what year E cams ? ie what letter is stamped on the sprockets. later year E cams are in fact S cams

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The cams is from a 2001 DRZ E sold in Canada ,not a Californian one. My S cams and supposed E cams are marqued with 29F (all 4 ) I remove the E cams and have about .025-30 " more in lift than the S cams.

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Eddie, i have anything to take a picture to show you . When i buy the bike at 2800 milles from a 60 years men , now at 3050milles.

Whit the TDC mark line up the ex cams arrow 2 are perfectly up and the int arrow 3 is verry slightly backward .When i change the cams i mark the chain link in front of his arrow.

I'm sure the cams are at the good place.

My whinters 2001 DRZ 400 E When i put a MCCT and adjust valves after winther the cams timing is not as good of my 400 S ( a new chain needed ) and it runs better than my 400 S Whit cams and jetting

My jetting written earlyer is good for my aplication ???

or some mods are needed ???

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marking the chain does no good. the chain can move off the teeth of the lower sprocket.

the jetting is reasonable.

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You are wright for marking the chain, but after chain + MCCT and turn engine 2 time to return next TDC and rechek the mark and it is OK .

Q for jetting. The need of the 100 pilot air jet it's only for the CE removal ???

this mod lean the air/fuel mixture ???

The pilot air jet is for the air/fuel mixture for ( only ) the pilot Jet ???

The CE is only for backfire in engine deceleration ???

I verify the color of my plugs and the mix is lean ( on normal riding )

what's the best for me

1- pilot jet 48 , 1 turn fuel screw , 160 main jet

2- EMN needle clip 4

3- reinstal the CE

4- or ?????

Thanks Pat

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I added E cams last week to my drz400s with the E header also (I also have a FCR-MX). I didn't notice much of a difference. I'm wondering if the E cams would like higher compression. Would higher compression move more air?

I have now changed to a 160 main Jet. Didn't think I'd need it because I still have the stock exhaust with the spark arrestor removed. On the freeway with the 155 my bike would hesitate when I opened the throttle, better with the 158. Now the hesitation is gone and I feel like I have more power. Yesterday I speed tested my bike because it was 103 degrees outside. I figured if its jetted to rich, it will run like crap. It ran the best it ever has.

I was wondering if you have discovered any solutions? I still can't believe my bike needs a 160, and maybe I'll try a 162.

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