2008 EC300 standard jetting

[HurricaneHarry]

Does anyone know what carb settings these had from the factory?
Cheers Paul

[(F5)]

Yes, incredibly badly chosen ones.

Read jetting threads for dramatic improvement.

[HurricaneHarry]

The tuner I'm taking the bike to wants to know how they are jetted from the factory as a baseline. Does anyone know? I realise they're very badly jetted and I'm sure mine has been experimented with, clearly to no avail...it runs like a drunk turtle.

[Jim Cook]

Originally Posted by HurricaneHarry

The tuner I'm taking the bike to wants to know how they are jetted from the factory as a baseline. Does anyone know? I realise they're very badly jetted and I'm sure mine has been experimented with, clearly to no avail...it runs like a drunk turtle.

Do you have the AS1 (screw on top) or AS2 (screws/bolts holding the to on) Carburetor?
(The AS2 jets leaner than the AS1.)

.

[(F5)]

You will spend a chunk of money if he doesn't have experience with GG trying stuff out. That takes time and money.

Read the threads, get the needle suggested, then if you dont feel like playing, give him the bike. The right needle is the key. Std N1FE for virtually all GGs, and they dont work well.

Old bikes you should really inspect the needle jet for wear. Ideally off the bike looking for any ovality with torch and magnifier.

You dont say where you are, but beware the black pipes. Some contain cat converters. Nickle plated ones will be fine.

[HurricaneHarry]

Thanks. Australia - nickel pipe. AS1 carb. He'll have a range of jets, needles, etc. He's very sceptical about forum advice but I'll give him a few suggestions based on what I've read about needles, needle jets.

[Gasser Nate]

I had the same bike basically, I settled on a 42/45 pilot N3EG needle #2 clip with a 175/178 main. Idled forever clean crisp and never fouled a plug.
Difference on forum advice versus here is we are all/were owners and have done all the research for you. Do not even bother starting with stock jetting. It is hideous.

[(F5)]

Depends on your ego . Or his.

I've built lots of 2 stroke small capacity roadrace bikes with several NZ titles.

But there is a wealth of info here from one make experts who have had to learn one bike. Saved me a heap of time. Start with the needle recommended above and experiment with pilots and mains suggested. That's what I was running in my 07. Until I put the later carb on as mine got damaged and would scratch the needle.

Careful of tuning in the field to make sure to keep the top of the tank clean when taking the top off. My mistake. Dirtbikes made a fool of me. Hence the damage. Easy to avoid if you are watching out for it.

[Jim Cook]

Originally Posted by Gasser Nate

I had the same bike basically, I settled on a 42/45 pilot N3EG needle #2 clip with a 175/178 main. Idled forever clean crisp and never fouled a plug.
Difference on forum advice versus here is we are all/were owners and have done all the research for you. Do not even bother starting with stock jetting. It is hideous.

Stock was:
38 pilot
#7 slide
N1ED
178 main jet

We had a dealership from 1997 through 2006, and struggled with getting the engines to run smoothly everywhere in the rev ranges with the stock jetting. The bikes ran like a bat out of hell on top, but they were set up for the expert level racers who always ran their bikes WFO.

The settings in the previous post (quoted above) is almost exactly what I ran on my 2006 DE300 (EC300) before I tried any of the Yamaha or Suzuki needles. The N1EG was the only N1E* series jet needle that worked well like that for us.

Here are my settings on the AS1 up to 4000' elevation.
N1EG with the clip in the second groove from the top,
#7 slide,
42 pilot
178 main jet.
I got a bit of spooge, but it idled well until it got very hot (after an hour working trails in 95F + temperatures).
If I was going to be racing in cool weather ( <60F) on a course with long straights, I would go up to a 180 or larger main jet.

I have since tried the optional Yamaha YZ250 and Suzuki RM250 jet needles (NEDJ, NECW, and a few more), and found them to be more easily adjusted for idling, power characteristics, and personalization of power delivery as the power transitions from low end to mid-range.

[HurricaneHarry]

Thanks for all this advice. I don't want the power too aggressive - is there a needle which will better suit more bottom/mid linear power?