Poor starting and erratic tickover

SOURCE: Muculloch brush cutter wont start. No spark.

If you have correctly diagnosed the problem as no spark, you will need to replace the ignition module. Unfortunately McCulloch dealers and McCulloch parts are very hard to find these days. If yoou do not have a dealer in yoour are who has the part you need, contact southern supply company at 205-833-2525 or email them at [email protected] and I feel sure Jason or someone there can help you.

SOURCE: i 've had this brush

Hi John, this is probably a carburetor adjust issue, but it could be something else like an air leak, plugged air or fuel filters or lines. A possibility could also be venting of the fuel tank. This is usually done by a one way valve in the gas cap. The carburetor itself could be causing this problem, and might need cleaning or a carb kit. Try adjusting the mixture screws that could be the problem. When adjusting needle screws turn 1/8 of a turn at a time. Start by adjusting the low (idle) speed mixture screw 1/8 turn out (counterclockwise) to add more fuel to the mixture (make sure you remember the start position). Start your brush cutter and see what happens. If you have to, do that procedure 4 or 5 times. If not any better, return the screw to it's starting position. You might try turning the screw in (clockwise) a few times and see what happens. For your info (the manufacturers suggest to adjust both the high and low mixture screws 1 turn out from a lightly seated position as a starting point to adjust carb. This is very often just right, but if adjustment is necessary it is usually not by much). If the low speed screw adjust has no results, try the same with the high speed screw. I hope this helps a little bit. Get back to me if you have any questions. All the best and good luck.