2010 EC300 Factory Jetting Specs - WTF?

[mrkartoom]

Keep us posted. I may play around more today if it stops raining.

You've got a lot more hours playing with this thing than I do and I'm already on overload. I just started a spreadsheet to document my tests. I'm thinking this is going to have too many permutations to ever keep straight without written documentation.

[husley]

Still using my settings from a couple weeks ago: 40, N3CH #2, 180 and 1.75. I just have not had time to change and test being that I have been spending all of my free time on my wife's new 200.

Riding 40'-70' F, 4000-7000 altitude.




Mid range is great, however the bike is a little less torquey off the bottom then I would have expected from a 300.

I am considering a couple different jetting options to improve the bottom end, what do you think?

1) Switch from a 40 Pilot to a 38

2) Install a N3EH so that I can get it a 1/2 clip leaner (not sure if this would improve the bottom end)


On a side note, I am somewhat certain that my main (180) is too fat, it just doesnt pull like I thought a 300 would.......my wife's 200 screams on the revs, mine just kinda slowly accelerates.

[GMP]

They usually make good torque off the bottom even if a shade fat. A little lean and they tend to go flat. If its not obviously rich off the bottom I'd try leaner not richer and test. Its almost summer now so things are changing. 180 is likely one or two fat for a 300, but it still won't rev like a 200.

[husley]

Originally Posted by GMP

They usually make good torque off the bottom even if a shade fat. A little lean and they tend to go flat. If its not obviously rich off the bottom I'd try leaner not richer and test. Its almost summer now so things are changing. 180 is likely one or two fat for a 300, but it still won't rev like a 200.

My bad: Not looking for it to rev like a 200, but it should produce as much HP/pull if not more, my 300 is just a little flat on top.

Will give a 178 a try....... hopefully in 10 days

[mtothef]

took my 300 up to the eastern sierra to play in some sand and snow mix - temps were barely in the 40s, generally around 5000' asl.

my sea level setup is: 40 pilot, 2 turns out on air screw, N3CH #3, 178 main.

noticed as soon as i got the bike warmed up off the truck there was a big bog off idle, just a giant hole where the fun used to be. thinking to myself "aha, must be the altitude making it too rich", i started going down in pilot size. 38, then 35. then i dropped the needle a clip. all of which made it progressively worse, to the point where the bike would stall when i cracked the throttle in slow going. doing my best tea-leaf palm reader impression, i checked the plug each time, and it was dark brown, verging on sooty.

then, riding it around the block one more time while my riding buddy went back inside to watch tv since he was sick of standing around in the cold while i made his front yard smell like gasoline, i pulled the choke on. whammo! instant horsepower. the fun was back.

ended up going to a 42 pilot, 1.5 turns out on the air screw. put the needle back at #3, roosted the hell out of everything all weekend long.

lesson learned. i am not very smart. and a 30 degree drop in temperature will trump a 4000' increase in altitude.

[Jakobi]

Originally Posted by mtothef

took my 300 up to the eastern sierra to play in some sand and snow mix - temps were barely in the 40s, generally around 5000' asl.

my sea level setup is: 40 pilot, 2 turns out on air screw, N3CH #3, 178 main.

noticed as soon as i got the bike warmed up off the truck there was a big bog off idle, just a giant hole where the fun used to be. thinking to myself "aha, must be the altitude making it too rich", i started going down in pilot size. 38, then 35. then i dropped the needle a clip. all of which made it progressively worse, to the point where the bike would stall when i cracked the throttle in slow going. doing my best tea-leaf palm reader impression, i checked the plug each time, and it was dark brown, verging on sooty.

then, riding it around the block one more time while my riding buddy went back inside to watch tv since he was sick of standing around in the cold while i made his front yard smell like gasoline, i pulled the choke on. whammo! instant horsepower. the fun was back.

ended up going to a 42 pilot, 1.5 turns out on the air screw. put the needle back at #3, roosted the hell out of everything all weekend long.

lesson learned. i am not very smart. and a 30 degree drop in temperature will trump a 4000' increase in altitude.

Be aware that when making jetting changes to pull the choke a few times after upr rotate the carb back and secure it. I have noticed sometimes it can pull the plunger up and it stays. Will make it super rich.

I found out taking N3CH#1 is far too lean. Pings under load and basically just has no balls. Drop it back to #2 and I get the a little bit of 4 stroking at times, but mostly all fun!

I need my N3EW to run in clip 2 with a 38 pilot! Wicked!

[mrkartoom]

When I spin my carb to get to the bowl drain plug for jetting changes it stretches the choke able just enough to pop it out of the seat. I too have made part of the ritual re-seating the choke cable and operating it a few times to make sure it is free.

As much as I like the lever up top I'm going to install the knob on the carb and ditch the cable. Got one in from CarbParts and it's going on. I'll miss it for testing, but I don't ride in the desert or spend lots of time in the top end, so I'm converting.

[Bailey28]

You guys have a cable! I just reach down to the carb and tickle the choke when I am warming up the bike.

I got my Aktive reeds for the CR250 reed cage today. I will report back later with the findings.

[mtothef]

Originally Posted by Bailey28

You guys have a cable! I just reach down to the carb and tickle the choke when I am warming up the bike.

I got my Aktive reeds for the CR250 reed cage today. I will report back later with the findings.

same boat here. no cable, simple plunger. i have had an aversion to cable operated chokes since having one on a suzuki 50 when i was 11...

[GMP]

I hope they scrap that on the '12s, and put the coin to something actually useful, like a longer throttle cable.