mikeg135

if you meant the overflow fuel lines from the carb, they are hanging straight down and clear....the crank case vent line located near the front sprocket it makes an upside "U" and ends up just above the front sprocket, it is also is clear. those are the vent lines I am aware. I want to ride it a bit more before taking off the exhaust and doing a burn, but this rain in the GA has my yard a muddy mess

I saw a video of someone using a heat gun to cook out the middle box...is that the normal process

took everything apart again tonight...verified the weight of the floats, removed every single component: jets, atomizer, choke, needle/seat, and filter screen. set need to second from the bottom, which I believe is the factory setting for sea level(D36 needle has 4 positions) and started with 3 turns out on the fuel screw....bike started up like normal. had a deeper tone to the exhaust and it actually felt like it had a little more grunt off idle. smoking seems to be about the same so as long as it appears to run normal, I am just going to ride and enjoy it and just realize that I won't be able to do any of the 12 mile trail loops in our area on the bike unless I get a larger tank. if I start fouling plugs relatively easily then I will revisit this issue....cheers and thanks everyone for the tips

I am really hoping this is the case.....the previous owner didn't have the bike long....but for the couple of months he had it he ran race fuel with Castor 927 at 32:1. The first time I got it hot after mixing in some regular pump 93 octane to bring the overall ratio to 80:1 the exhaust core got cherry red and started throwing sparks. I didn't run it long like that and have since repacked the muffler. It hasn't done that again with just pump fuel and Belray H1R at 80:1 and the plug is definitely still pretty black with no signs of grey, white, or brown coloration. I read the exhaust can do that if there is a significant amount of unburnt oil in the middle box. I think what just has me a tad worried is that the needle is at the leanest setting with the fuel screw 2 1/8 turns out and it still feels since it feels boggy and definitely more smoky after some short low rpm drills along with the what seems like higher than normal fuel use. I have worked on and carbs before, but never a dellorta. My current settings just seem a bit off compared to what I have read should be normal.

haha, yeah I am nearly 50 and still a bit apprehensive these days after a gnarley mountain bike accident last year put me in the hospital with a broken collar bone, 5 broken ribs and a collapsed lung. I got hooked farting around the yard on a trials bike after a couple of friends let me ride theirs at Barbers Vintage festival this past Fall. The choke lever is definitely in the down position(off), is it possible on the Dellorto carbs for it to be slightly open even if the lever looks to be fully down? That is the one part that I didn't take apart to clean when I had the carb off yesterday.

didn't think of that...I had the carb off yesterday to verify the jetting and clean it....but didn't remove the choke assembly though. over all everything look pretty clean inside the carb with no noticeable signs of neglect. But I will take a closer look to ensure its going up and down fully

Thanks for the reply. I does seem ok, maybe a little high through the glass. I will keep an eye on that. I would imagine changing that seals doesn't require splitting the cases just removing the side cover, clutch and primary gear to access it.

Recently picked up a post deployment present for myself, 2009 Gas Gas 300 TXT as my first trials bike. Wife appreciates the slow riding for now working on skills in the yard compared to the zipping around on the KTM 200.😃

Hello, first wanted to say what a great site. I picked up a 2009 Gas Gas 300 TXT Pro as my first trials bike and having a blast. though I am trying to work out the carb settings....it seems to smoke more than I think it should, at least compared to my other other 2 bikes(KTM and YZ125) and seems to be using more fuel than what I expect. Just playing around the yard with 1/2 idle and 1/2 clearing it out with modest throttle( no more than 1/2 throttle) it seems to burn about 40oz of fuel in a 15-20 session. it has plenty of power. I am at 350ft above sea level and has the following settings which is how I received it: Dellorto Carb 118 Main, 35 Pilot, D36 Needle in the leanest position (clip in highest position), and fuel screw at 2 1/4 turns out. Air filter has been serviced and plug is a tad oily. Fuel: fresh non-ethanol 93 octane & Belray H1R at 80:1 Any ideas? or is the smoking and fuel burn seem average? Bike does seem to run well, just smoky and will load up after a minute of so of slow turns and figure 8s.