376 bell mouth

[RoyC]

My existing 376 has a long bell mouth with a gauze over the inlet but my new 376 has been supplied with a short bell mouth and no gauze.
Which one is best to use ?

[Triton Thrasher]

Gauze can be restrictive and cause gross richness if you try to go fast.

An air filter is probably a better idea than either type of trumpet.

[duTch]

 ...But at least gauze will hold back bricks,dogs,birds and small children 

[muskrat]

The gauze also acts as a spark arrester. Flame blow back through the carb. Burnt an A65 like that.
Cheers 

[Rex]

Dead right, the gauze type aren't air filters as such, but "flame traps". Normally found on big singles where a back fire would see flames all over the carb...