Setup for Mikuni TM40 pump carb for berg fc 600

From the Mikuni site:

Carburetor jetting:

Excessively lean carburetor settings can contribute to backfiring. If the mixture is too lean, it may burn very slowly and unevenly. This condition, in turn, may result in burning mixture remaining in the cylinder until the beginning of the next intake stroke when it can ignite the incomming air/fuel mixture.

A too-small or partially blocked pilot jet can bring about this condition.

An accelerator pump adjustment that starts the pump too late can cause this problem.

A partial vacuum in the fuel tank can reduce fuel flow and bring about a lean condition. The common factory Harley gas cap that incorporates a one-way valve (for emission purposes) sometimes restricts air flow into the tank. This restriction can result in a partial vacuum and fuel flow restriction.

http://www.mikuni.com/tg_backfires_through.html

I would start increasing the size of the pilot jet, one size at a time, until the backfiring ceases. The carb you have selected is not one of the most popular for a Husaberg hence not too many here will have ballpark settings for you to start from. Most just get the Dell set up or go to a FCR.

put mikuni in a search and there have been the occasional but rare runners.

regards

Taffy