Posts
563
Joined
12/17/2009
Location
WV
US
Whymee
12/13/2017 12:55pm
12/13/2017 12:55pm
Edited Date/Time
12/15/2017 7:03am
Gents,
Been reading various jetting threads with great interest. Seems a lot of SX/TC250 owners are rich at idle or just off idle. This seems to be the reason why some are going to a richer slide (my opinion, just a guess).
I and it seems several others are having the opposite issue. Running on at idle (or words to that effect) which indicates a lean condition at idle or close to. I have seen several people post with this problem (I have it too) with no remedy, or no answer at all. I was kinda waiting for someone to come up with the answer but I have not seen a cure.
In full disclosure I have a 38 PWK short body on pre order from JD jetting. I also have a STIC Metering Block on order from Harris Performance all in an effort to quelch my jetting issues.
I think I have found a potential cure for the stock TMX. I say potential because it is winter time here in West Virginia and I will not be able to test. This is a cure on paper (I hope)!
I know all about the main tuning features of a carb, although I am far from an expert. I usually jet on the rich side for safety. I have messed with the pilot, main, needles, needle jet, air screw etc. I just came upon a couple of references online about the 38 TMX short body where they reference a "starter jet". I have not heard of this critter before. I always thought that was a non tune able portion of a carb. Well low & behold this TMX has a tune able starting system.
In the video below at the 1:48 mark, you will see where this little critter lives.
https://youtu.be/XtrQK5I-oYE
This is a blown up pic of what it looks like.
I do believe (guessing) that if we go richer on this jet this MAY solve our run on at idle issues. Plus the first time I tried to start my new bike, it was a bear to start & needed a little throttle to start. I am damn near to the point of convincing myself that this is the answer. What say you?
There is VERY little info about this starter jet on the interwebs. I really had to dig & scratch around to find these three. In this link , where I got the pic from above, they talk about the starter jet (Controls enrichener circuit on many Mikuni carburetors) available in 20 to 100 sizes. In this link which is a PDF file, on the bottom of the first page is a reference to this jet in 20 thru 120 sizes.
Also found this link over at Thumpertalk where they briefly talk about this jet.
The stock size on a 18 TC250 is 80. So far I have not been able to find which way to go for a richer jet. Best guess is a larger number. Although that is just a guess at this point.
That is all I have at this point. More to come as I learn more about this elusive critter.
Been reading various jetting threads with great interest. Seems a lot of SX/TC250 owners are rich at idle or just off idle. This seems to be the reason why some are going to a richer slide (my opinion, just a guess).
I and it seems several others are having the opposite issue. Running on at idle (or words to that effect) which indicates a lean condition at idle or close to. I have seen several people post with this problem (I have it too) with no remedy, or no answer at all. I was kinda waiting for someone to come up with the answer but I have not seen a cure.
In full disclosure I have a 38 PWK short body on pre order from JD jetting. I also have a STIC Metering Block on order from Harris Performance all in an effort to quelch my jetting issues.
I think I have found a potential cure for the stock TMX. I say potential because it is winter time here in West Virginia and I will not be able to test. This is a cure on paper (I hope)!
I know all about the main tuning features of a carb, although I am far from an expert. I usually jet on the rich side for safety. I have messed with the pilot, main, needles, needle jet, air screw etc. I just came upon a couple of references online about the 38 TMX short body where they reference a "starter jet". I have not heard of this critter before. I always thought that was a non tune able portion of a carb. Well low & behold this TMX has a tune able starting system.
In the video below at the 1:48 mark, you will see where this little critter lives.
https://youtu.be/XtrQK5I-oYE
This is a blown up pic of what it looks like.
I do believe (guessing) that if we go richer on this jet this MAY solve our run on at idle issues. Plus the first time I tried to start my new bike, it was a bear to start & needed a little throttle to start. I am damn near to the point of convincing myself that this is the answer. What say you?
There is VERY little info about this starter jet on the interwebs. I really had to dig & scratch around to find these three. In this link , where I got the pic from above, they talk about the starter jet (Controls enrichener circuit on many Mikuni carburetors) available in 20 to 100 sizes. In this link which is a PDF file, on the bottom of the first page is a reference to this jet in 20 thru 120 sizes.
Also found this link over at Thumpertalk where they briefly talk about this jet.
The stock size on a 18 TC250 is 80. So far I have not been able to find which way to go for a richer jet. Best guess is a larger number. Although that is just a guess at this point.
That is all I have at this point. More to come as I learn more about this elusive critter.
Post a reply to: 17-18 TC/SX Run on at Idle (jetting issues)