2004 EC200 Jetting

[Jakobi]

Haven't used one of those needles myself. No idea re tapers etc.

You can still easily advance the timing on the stator on all models. If you remove the stator you'll see one bolt runs through a guide. Remove this and you'll get the range needed to advance or retard a few degrees.

[2004ec200]

Changed to a 180 MJ. put in a new clean plug. Ran around a little track in the yard about a mile. Still no spooge, plug insulator is brown on one side, ground electrode is just as clean as when it went in. Do have some exhaust smoke when gassing it. Seems a little more doggy just before hitting the pipe with the 180 mj vs the 172, you can even hear it. Think I'll try the NEDH needle again and see how it does with the larger mj.

By what I've read the NBHW is the stock needle. There is mention of it HERE

[liv2day]

Originally Posted by 2004ec200

Think I'll try the NEDH needle again and see how it does with the larger mj.

By what I've read the NBHW is the stock needle. There is mention of it HERE

Be interested in hearing what you find after throwing the NEDH back into the bike. I've thought about going up a size on the MJ on my bike (currently at 172), but haven't had it flat or felt like it was lean up top.

Without knowing the taper comparison from NEDH to NBHW, it's tough to figure out how that would play with the 180MJ. But, given that NEDH is on the leaner side of the Zuk needles, that might be a good combo.

Post up what you find

[2004ec200]

Well Live2day, you and I must be on the same wavelength. It seems when you increase timing the bike burns the fuel better and of course gives more power but could be reducing lubricants (hence less spooge and a clean plug). So I first tried raising the stock needle to the 3rd clip from 2nd and reduced timing to 1.5mm to lube things up a little more. Findings were the same as before reducing timing and raising the needle a clip. So, I left the timing at 1.5mm btdc and put in the NEDH needle 2nd clip. Bike gets into the power quicker and is a little smoother into the power band. The plug ground electrode finally has some color and after about 2 miles on my small track just a tad if any spooge. I have not tried top end but I think it will be just fine seeing I don't run up there anyways. So I think I'm going to run this setup for a while a see how it works. Thanks for the comments and suggestions all.

[2004ec200]

forgot to mention, I measured the diameters of the needles in different areas for those interested. I put the jaws of my calipers flat against a table top and put the needle straight down till it touched the table and made some measurements.

tip of needle at first taper:

NEDH = 1.49 mm
NBHW = 1.56 mm

bottom of jaws 21.15mm above table:

NEDH = 2.41 mm
NBHW = 2.45 mm

bottom of jaws 38mm above table:

NEDH = 2.72 mm
NBHW = 2.72 mm

I had mentioed in an earlier post then the NEDH looked thicker but I think I had the needles backward then.... my bad..

went and road another 2 miles (about ten laps) around the track and I am very happy with the current setup. Which is:

Large volume power valve cover
NEDH needle in 2nd clip
1.5mm btdc timing
180 mj
40 pj
premium unleaded fuel at 45:1 ratio
12/48 sprockets
BR8ES spark plug at 8mm gap
green .3mm base gasket
I don't think head has been modded.

Ahhhhh, this margarita taste good. Nice to finally have the jetting sorted out.

Cheers

[Jakobi]

Good work mate! Only thing I'd pick on is to say that the tapers start at the thick end of the needle, but that'd be picking at straws.

[Danj56]

Originally Posted by 2004ec200

Ahhhhh, this margarita taste good. Nice to finally have the jetting sorted out.

Cheers

What slide? and was the rim salted

[2004ec200]

#6
no salt

[liv2day]

Originally Posted by 2004ec200

Ahhhhh, this margarita taste good. Nice to finally have the jetting sorted out.

Cheers

That's awesome man! I know exactly how you feel on that marg - feels so good to get it sorted and have the power where you want it

Food for future thought - the RB Head Mod. I waited a couple months before doing this to my 200 (mistake), but did it right "out of the box" on my wife's 200 as it's that good.

Power is incredibly crisp and comes on smoothly. And the impact it has on fuel efficiency is amazing. Prior to doing the head mod, I'd hit 38-40 miles of trail riding before hitting reserve. I did 50 miles this past Saturday and didn't hit reserve until after I was home doing the post-wash engine warm-up and quick ride up and down our road.

Now, back to that marg...lol.

[Caravan Monster]

re. the NBHW needle

my set up is:

'06 EC 200
NBHW needle 2nd clip
slow #45
main #175
airscrew 1 1/2 out
1.2mm squish
recent piston rings
boyeson carbon fibre reeds
fmf gnarly pipe
13/50 gearing, trail, tops out around 70 mph and around 70 miles to the tank
13/52 gearing, race, tops out around 60 mph
standard uk pump petrol mixed at 45:1 fully synth

My question is does anyone know of a needle similar to the NB*HW, but with a slightly narrower straight section ? I make the straight section to be 2.89mm dia., which I suspect to be a touch lean and the reason why the tickover screw needs to be wound in as far as it will go to get it to tickover. Other than that small failing, it runs great with the above set up. The surface is starting to pit on my needle, so it needs replacing and it would be good to get the tickover back into the middle of adjustment.

*the 'B' is weird looking, like an upside down greek beta letter, but I'm fairly sure this is the needle this bike came from GG with.