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Go Kart Inner Tube Size Answered

The inner tube on my go kart recently broke, and when I took it out of it's tire, I saw a large "3.50-4".  I also saw a small 78 on the opposite end of the tire, a "DDD" between the two previous mention marks, and a "D" by the valve. What do these markings mean and how can I find a correct replacement?
Photos below picture the previously mentioned makings respectively.


I'm guessing its a 4.10 x 3.50 - 4. You can see a bunch of them here.

To be sure you get the right size, take the inner tube with you to the store, and have someone look at it. Even if you plan to buy online, they can help you make sure you get the right size. What the "D's" mean, I'm not sure (could be related to the manufacturer). The only other thing you'll have to make sure is it to get the right stem. Some are straight, and some are bent.

I hope that helps.

You are completley correct. Upon further examination of the wheel itself, not the inner tube, I saw exactly what you just stated. Thank you for your help!

You're welcome. Glad to help. :)