I imported 2 Sambars. One of them had the two smaller ducts cut or ripped off between the air air filter housing and above the muffler(?) a chamber of some sort. Both hoses on each side were still held on each side with the clamp but the middle was missing. If I could figure out how to post a photo I would! What are these for? I thought they might be like a pre heater for the carb but while the engine was running it felt like there was a slight vacuum on the chamber. I do have new ducting that I am going to install this weekend just would like to know what they are for? Thank you 39
They are pre-heating for the carb. They take fresh air around the muffler to heat it then back to the carb intake. Once the intake is warm a small valve closes and only cold air goes to carb.