little dave Posted November 9, 2009 Share Posted November 9, 2009 on my 1974 dt175 i have the mikuni carb with the round slide. anyhow it has come time for me to buy some parts for it, float gasket, mostly. but i figured as long as i was at it i would finally buy a main jet. my air filter is pretty much one of the cone ones. and when i got the carb it had a lump of lead blocking the jet intake and a regular bolt in the banjo bolt hole. (basically it had a fully clogged main jet.) i removed the lead and fashioned a cap for the opening so as to allow fuel to be able to flow into the main jet intake area. but without a main jet installed, (never had one) it tends to run really rich, even with the throttle needle in the top notch. i want to put in a main jet assy. which jet would be appropriate for a low restriction air intake? I dont want to spend the money on all 3 if i can avoid it, and i dont want to run too lean, or have the same problem i do now. my choices are 150, 160, and 170. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted November 9, 2009 Moderator Share Posted November 9, 2009 on my 1974 dt175 i have the mikuni carb with the round slide. anyhow it has come time for me to buy some parts for it, float gasket, mostly. but i figured as long as i was at it i would finally buy a main jet. my air filter is pretty much one of the cone ones. and when i got the carb it had a lump of lead blocking the jet intake and a regular bolt in the banjo bolt hole. (basically it had a fully clogged main jet.) i removed the lead and fashioned a cap for the opening so as to allow fuel to be able to flow into the main jet intake area. but without a main jet installed, (never had one) it tends to run really rich, even with the throttle needle in the top notch. i want to put in a main jet assy. which jet would be appropriate for a low restriction air intake? I dont want to spend the money on all 3 if i can avoid it, and i dont want to run too lean, or have the same problem i do now. my choices are 150, 160, and 170. Hi Dave, if your bike is a DT175A the correct standard jet would be 150, you are running a less restrictive filter so that will require a richer jet, say 160. Also air density has an effect too, high altidude and hot dry climates etc also have the effect of richening further. I would go for the 160 first and do a plug chop, put the needle back to the correct clip position. jets aren't expensive anyhow so you could even buy a choice of the sizes Link to comment Share on other sites More sharing options...
Recommended Posts