So i decided i was going to rebuild my carb on my truck which has the 400m in it and when i took the two idling screws out on the front of the carb they were set at 3 3/4 turns out. The truck always ran great but my accelerator pump was bad so i rebuilt the whole carb and i set the screws back to where they were before and now it smells like it's burning raw fuel but I'm just curious is to why they were set out so far and it ran as good as it did? ?

 

I can't say for sure why it ran well, but these things do require tuning. Now that it's rebuilt, start over at 1 1/2 turns out and adjust.

 

Alright i will try that tonight and get back to you on how it goes

 

Well i couldnt get the truck running right and i took the carb off again and found that i have made a major rookie mistake... and somehow forgot to put the two main jets back in so im ordering new ones and i should be able to get it runnong without a problem but i appreciate the help though thanks

 

That would explain the raw fuel smell!

 

Ya it would....but I still can't believe i did that haha

 

Yeah, we all make mistakes that make us feel silly at some point. Glad you figured it out!