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A backfire describes the loud pop or bang you hear in your motorcycle’s exhaust when it’s not tuned quite right.
There are a number of different reasons why your motorcycle backfires, some easier to fix than others.
Backfire is caused by a secondary, unexpected combustion when there is unburnt fuel in the exhaust.
The underlying cause of motorcycle backfires is an improper fuel mixture.
Reasons for Motorcycle Backfire
The improper fuel mixture that causes the backfire can be attributed to a number of things. The most common ones to check are:
- Loose exhaust pipes or carb manifolds.
- Improper exhaust system for the current jetting.
- Weak spark.
- Improper ignition timing.
- Too much fuel.
- Too much air.
- Dirty carbs or clogged jets.
Fixing a Motorcycle Backfire
Start with the easy fixes first and move down the list:
- Make sure everything is properly tightened.
- Did you change the air filter or air box without rejetting the carbs?
- Did you change the exhaust system without rejetting the carbs.
- Is your battery charged and healthy?
- Is your timing correct?
- Are your carbs clean and tuned properly?
Backfire can be prevented and a properly tuned engine can be maintained with regular maintenance and inspection.