Cylinder and piston kit for the Husqvarna 130BT and 530BT backpack blowers, 29.5cc, replacing cylinder 504118701 and piston 576389101, which is also catalogued as 504120301. The 530BT is the dealer channel version of the same blower and uses the same top end. This kit does not fit the 150BT or 350BT, which are 50.2cc machines with a 44mm bore and a different cylinder entirely. Check the model plate before ordering. The kit contains the cylinder, the piston, two piston rings, the wrist pin and the circlips; the cylinder base gasket and crankshaft seals are separate parts. Cylinder scoring on a backpack blower is usually caused by dust getting past a poorly sealed or neglected air filter rather than by honest wear, so inspect the filter and its housing before fitting new parts. Pressure and vacuum test the crankcase, fit a new cylinder base gasket, and break the new top end in at reduced load for the first few tanks.
- FITS THE HUSQVARNA 130BT AND 530BT BACKPACK BLOWERS, 29.5cc. Replaces cylinder 504118701 and piston 576389101, also sold as 504120301. The 530BT is the dealer channel version of the same machine and takes the same top end. A blower that has lost power, will not hold an idle, or shows scoring through the exhaust port needs this repair.
- NOT THE SAME AS THE 150BT OR 350BT. Those are 50.2cc machines with a 44mm bore and an entirely different top end. Backpack blowers all look alike from behind and this is the mix-up that costs people a weekend. Check the model plate on the frame before ordering.
- WHAT KILLS THESE. A blower lives in dust and the air filter is the only thing between that dust and the bore. If this cylinder scored, look at the filter and the filter housing seal before you fit a new one, and check the intake boot for cracks. A fresh top end on a machine still drawing dirt buys you a few tanks of fuel.
- IN THE KIT: the cylinder, the piston, two piston rings, the wrist pin and the circlips. The cylinder base gasket and the crankshaft seals are separate parts and worth having on hand before you start, since you will not want to stop and order them with the blower in pieces.
- DO IT ONCE. Pressure and vacuum test the crankcase before running fuel through the new piston, because an air leak is what scored the first one and it will score this one too. Clean the exhaust port and muffler screen, and run the first few tanks at reduced load rather than leaning it out and going straight to work.