Sum

Thanks! Bought a 10-tooth

The manual says the idling jet is 45. A smaller sprocket is actually a good idea, because if I can rev just a bit, it goes away. A dealer near me started to sell GasGas from this season. I'm very lucky because it's only 30 min away. Otherwise, the closest one (Beta) used to be 100 miles away. Bad news is, this is the first trial bike they ever sold and I don't think they have much experience.... It seems some KTM dealers in US start to sell GasGas.

Thanks Tshock250 and Jeff, Looking at YouTube, I have seen some are similar to mine and some seem much less. It doesn't bother me that much but some practices require "no clutch" slow operations, which are quite hard with the bangs at low speeds (they disappear with little rev). If I can tame it down a bit that'd be great. Played around with the air screw a bit but I must agree that the factory set (1 - 1.25 turns) is the best. I'll try high octane for the next fuel. thanks,

Thanks. I searched through Internet and found this description; "rider is experiencing rich pipe bang, it's a deeper sounding bang and the bike lurches forward on each bang". This is exactly what I'm experiencing and, thus, probably the rich pipe bang. Because it happens only at idle, would you suggest me to try the air screw, letting more air to come at idle? Or should I try the idle jet? I suspect this is, to some degree, a normal behavior and maybe I should not worry too much about it....

Is it possible that I need to clean the carb even for a brand new GasGas? My 2020 TXT 280 needs good 10-20 kicks to start. I don't want to think about what would happen if it stalls in the middle of a steep slope.....

Thank you all. I watched few YouTube video of TXT and at idle they also seem to have pipe popping every second or so. This one below sounds very similar, even the way it is reluctant to start?. Mine has hardly any smoke coming out, though. As long as it is not abnormal, I can live with that. My KTM also has some but not this much pronounced and because the TXT is so light, it is propelled at each pop, which I was not familiar with. Because it still has the gas filled by the dealer, I don't know the fuel mixture. Carb setting is something I need to learn. Maybe I will start with the idle mixture (is it the same as the air screw?) .

Hi all, I am new to a trial bike and a 2 stroke engine with a carburetor. So, little education would be greatly appreciated. With my new 2020 GasGas TXT 280, I hear pipe pop or bang periodically at idle. I have been trying slow maneuvers and when I try it without clutch at the idle speed, the bike is pushed forward with every pop, which makes it difficult for smooth operations without using the clutch. The symptom becomes better a bit as the engine warms up but still there at idle speed especially with the slight up hill (thus the engine is slightly loaded). I guess my question is, is it what it is or something I can solve by carburetor setup. I would appreciate your advise. thanks,

Hi Dzl850, I also a newbie and just bought a 2020 TXT 280 and have exactly the same issue. Even if I pull the clutch all the way in, it drags a bit. One-finger operation makes it even more noticeable (because I can't pull the lever to the bar). However, it is not bad enough to stall the engine and becomes slightly better as the clutch plates warms up. I have a similar symptoms, especially when cold, with my KTM 150 and when I bought a Midwest Mountain clutch lever, the instruction says that it is normal to have slight drag until the clutch warms up and thus adjustments have to be done after it gets fully warmed up. The drag of my TXT is slightly worse than the KTM but as long as it doesn't stall and the bike can go backward in slopes, it may not be a big issue. I will continue to fiddle with the setting and Apico Flex levers do look great for the adjustability (I can't find where I can buy them, tho). Let's see how it goes as the bikes break in.