Hisun HS800UTV - Engine Backfires on Deceleration; Poor Fuel Mileage; Engine will Not Idle or Idles Roughly

GENERAL INFORMATION
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conditions:
a. Incorrect float level adjustment.
b. Plugged pilot jet or pilot system.
2. Faulty accelerator pump.
3. Loose exhaust pipe-to-cylinder head connection.
4. Intake air leak.
5. Incorrect ignition timing or a damaged ignition system can cause these conditions. Perform the Peak
Voltage Tests to isolate the damaged ignition system component. Check the ignition timing as
described.
NOTE
The ignition timing is controlled by the ICM and
cannot be adjusted. However, checking the ignition
timing can be used to diagnose problems.
6. Check the following engine components:
a. Broken valve springs.
b. Stuck or leaking valves.
c. Worn or damaged camshaft lobes.
d. Incorrect valve timing due to incorrect camshaft installation or a mechanical failure.
Engine Backfires on Deceleration
If the engine backfires when the throttle is released, check the following:
1. Lean carburetor pilot system.
2. Loose exhaust pipe-to-cylinder head connection.
3. Faulty ignition system component.
4. Check the following engine components:
a. Broken valve springs.
b. Stuck or leaking valves.
c. Worn or damaged camshaft lobes.
d. Incorrect valve timing due to incorrect camshaft installation or a mechanical failure.
Poor Fuel Mileage
1. Clogged fuel system.
2. Dirty or clogged air filter.
3. Incorrect ignition timing.
Engine Will Not Idle or Idles Roughly
1. Clogged air filter element.
2. Poor fuel filter or fuel hose.
3. Faulty accelerator pump assembly.
4. Contaminated or stale fuel.
5. Incorrect carburetor adjustment.
6. Leaking head gasket.