back fire

[khariag]

my engine backfires something serious when ever i rev allittle to much and let go.sounds cool but it also sometimes shoots alittle spark.what causes this?>i have a 6hp and someone told me it was fuel injected

 

[modelengineer]

It's not fuel injected.

It's normal for one of these carbied engines to backfire a bit on the overrun. Just roll with it, it looks and sounds really cool.

 

[khariag]

thanks

 

[jr dragster T]

If its popping threw the header your too lean on your pilot system. Turn in your airbleed a touch.