Dazza320 Posted January 1, 2021 Report Share Posted January 1, 2021 Hi guys, new to trails bikes and new to trailscentral so I will be popping up often asking lots of questions, I have just purchased a 1998 tx320, not in bad condition but needs the basic maintenance, pulled the dellorto carby down, jetting is as follows Main jet 122 Pilot jet 50 Needle x18 clip 1 Slide 45 Can anybody confirm this is the factory jetting Quote Link to comment Share on other sites More sharing options...
peterb Posted January 4, 2021 Report Share Posted January 4, 2021 The usual carbs fitted to GG trials bikes have mostly been DellOrto PHBL26, during 1996-1998 GG fitted PHBH26, which I thought never performed as well as the usual carb, particularly when riding over different altitudes, plus they have a dual stage pilot jet that is prone to blocking. Anyway, with your carb, the standard jets are as follows: Needle X19 clip 3rd slot from top, I think I ran mine at 2nd from bottom - or maybe this is the same notch. Slide 45 Main 122 Needle jet (Emulsor) 269 Pilot 50 They used to run a bit rich so very likely a 118 main is worth a try, if this is the case. Bye, Peter B. Quote Link to comment Share on other sites More sharing options...
Dazza320 Posted January 4, 2021 Author Report Share Posted January 4, 2021 Thankyou for the response Pete, looks like mine is pretty close to factory settings, it's 34 degrees Celsius here in Brisbane Australia so I'm guessing it's slightly rich, I've had good success leaning out bikes my switching to E10 petrol Quote Link to comment Share on other sites More sharing options...
peterb Posted January 4, 2021 Report Share Posted January 4, 2021 G'day Dazza, a balmy 26C here. E10 is 10% ethanol isn't it? I am pretty sure that using ethanol in 2T motors is not the best as the ethanol (alcohol) attacks the seal elastomers in the engines, have yours been ok with this fuel over a long period? It may just be a problem with our E10 fuel over here in NZ. Those 320/321 models go really well with a Keihin PWK28. Bye, Peter B. Quote Link to comment Share on other sites More sharing options...
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