Weird jetting!
So i took my carb off today to verify what i had in my notes because the jetting values i had were no were near what everybody elses are.
My bike is a 2011 ec 300 that i think is all stock but the jetting i have is 145 on the main and 38 on the pilot. I have no idea wich needle is in there and cant see any writing on it. The slide is a number 7. The bike runs good, smokes only a little and the plug is actualy pretty dark. Any ideas as to why my jetting is so different? |
Quote:
The main is too small, the bike will be asking for more fuel. I run a 40 pilot and # 2 from top for the needle. I'm about 5hr from you. |
Theoreticly it should i know. But it definatly is running good.
Just wondering what could make it need such a small main jet. |
Are you actually riding hard enough to get on the main jet? The main jet is mostly controlling the mixture past 3/4 throttle and you've got to be riding with the throttle almost pinned to see what effect your main jet has.
A small main would require a needle with a very small bottom diameter. |
Are you sure it isn't a 175 main?
If you don't see any markings on the needle it may be a jetting kit where the markings were removed to keep someone from copying it. e.g. old LTR jetting kit. This is a keihin needle. If you don't know which needle it is - I would pick up a needle suggested elsewhere here - e.g. "suzuki needle" or "yamaha needle"... With all replacement (improvement) needles - you typically run a richer pilot jet and reduce idle setting to better separate the carb circuits (high/low). My experience (which is a bit dated) is that you should see a 42-45 pilot - maybe a 40 - but definitely not a 38 if things are set up "well" (given conditions are not extreme). jeff |
Weird jetting!
https://uploads.tapatalk-cdn.com/201...db2167cf18.jpg
You can see it pretty good in the pic but in real life it's even more clear that it's a 145. And no I don't tend to reach above 3/4 throttle except on the rare occasion. Sent from my iPhone using Tapatalk |
Weird jetting!
https://uploads.tapatalk-cdn.com/201...b42264e3d8.jpg
Here's a pic of the needle. Sent from my iPhone using Tapatalk |
Is it a 36mm carb? Some 2011 models came with them.
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No it's the 38, I was just looking it up to see which one I had.
I have a left over 42 sj from my kdx220 but I'm kinda having a hard time seeing if it's compatible. Sent from my iPhone using Tapatalk |
Perhaps your 145 main has been bored out? If the needle is modified the main could be too.
Sent fra min E5603 via Tapatalk |
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