Wraith88

Thanks everyone. Was indeed leak at the crankcase to carb joint. One of the little rubber tabs that seat into crankcase was caught under and preventing good seal. runs good now. Thanks for all the advice.

Tried idle adjustment already and also tried moving the c clip on the needle to lower it, also no effect. So stumped on this one. Really strange behavior. But thanks for your advice.

I'm sure it's not that, but thanks.

Just bought a 74 DT175 soaked the carbs, sparkling clean now. Replaced spark plug and fuel line, coated tank, new oil. Getting good spark, fuel into carb, oil to cylinder from pump, can hear throttle work properly, set air mix screw at 2 turns out and idle screw at 3 turns out. With choke out starts right up but idles at 8000 rpm. Put choke in immediately dies. No air filter in, I don't know if that would cause any of this. Any help would be great. Thanks

Just bought a 74 DT175 soaked the carbs, sparkling clean now. Replaced spark plug and fuel line, coated tank, new oil. Getting good spark, fuel into carb, oil to cylinder from pump, can hear throttle work properly, set air mix screw at 2 turns out and idle screw at 3 turns out. With choke out starts right up but idles at 8000 rpm. Put choke in immediately dies. No air filter in, I don't know if that would cause any of this. Any help would be great. Thanks Problem solved. Was leak at crankcase to carb joint.