Service & Maintenance Question
The following work has been completed, but the saw still fails to start:
- Compression test = Passed (160)
- Pressure (leak) test = Passed
- New NGK spark plug installed (BPMR7A)
- Carburetor rebuilt with new gaskets and diaphram - cleaned w/ carb cleaner and compressed air
- Carb needle valve inspected and arm adjusted correctly
- Cylinder and piston removed for inspection & cleaning = Passed
- New base cylinder and muffler gasket installed.
- New Husqvarna hoses (fuel and pulse lines) installed
- New fuel filter installed
- Pulse liine tube (brass) inspected and determined to be clear
- Carb intake manifold inspected = Passed
- Flywheel removed to inspect key alignment (timing) = Passed
- Fuel tank removed to check vent - appears to be clean and functional
- New Husqvarna fuel tank cap installed
- Fresh mixed fuel (50:1) added to tank
- Inspected ignition module contacts and flywheel contacts - Passed
- Determined spark / fire at spark plug = Passed
- Saw has had minimal use and looks clean and new (well maintained)
I removed the spark plug and added a small amount fuel into the cylinder, attempted to start (no choke). After several pulls the saw popped just once and did not run for a short interval, as one would expect.
I'm lost to what the problem may be, or what to do next. I'm open to any advice or suggestions that someone may have.
Thanks.
Best Answer
Answer
Hi Gary,
Sorry your having trouble with your saw. Everything sounds good. I am curious if your checking your spark with a spark tester. This allows the plug to remain in the cylinder to see if it is firing under compression. It only take a 1000v to fire in atmospheric pressure compared to 8-10000v to fire in the cylinder. Assuming you are it sounds like your having a fuel delivery issue. Try spraying WD-40 or carb. cleaner in the intake to see if it will fire off that. If it does, you are not getting fuel to the carb. I know you took the carb. apart to clean it. It's possible it was not assembled correctly. What are the high and low speed settings? Your carb. needs to be adjusted by a certified repair facility to have that set up proper. EPA mandates this and can not be performed by the general public. You didn't mention your air gap for the coil and flywheel. The proper air gap is 0.3mm. Also check the gap on the plug, that is 0.5mm. These affect timing and could also be part of the problem. That is not your serial number that is a SKU/Product number. Your serial should be on the same tag. Hopefully this has helped. If your still having issues you need to get into your local dealer. Without having the saw right in front of me it's hard to say what could be wrong.
Hi Gary,
Sorry your having trouble with your saw. Everything sounds good. I am curious if your checking your spark with a spark tester. This allows the plug to remain in the cylinder to see if it is firing under compression. It only take a 1000v to fire in atmospheric pressure compared to 8-10000v to fire in the cylinder. Assuming you are it sounds like your having a fuel delivery issue. Try spraying WD-40 or carb. cleaner in the intake to see if it will fire off that. If it does, you are not getting fuel to the carb. I know you took the carb. apart to clean it. It's possible it was not assembled correctly. What are the high and low speed settings? Your carb. needs to be adjusted by a certified repair facility to have that set up proper. EPA mandates this and can not be performed by the general public. You didn't mention your air gap for the coil and flywheel. The proper air gap is 0.3mm. Also check the gap on the plug, that is 0.5mm. These affect timing and could also be part of the problem. That is not your serial number that is a SKU/Product number. Your serial should be on the same tag. Hopefully this has helped. If your still having issues you need to get into your local dealer. Without having the saw right in front of me it's hard to say what could be wrong.