Oh, another thought on modifications or revisions, If you can find the next model year or even two years of IPL’s sometimes you can figure out the changes that they may have made by comparing the IPL drawings. Some Individuals that want to soup up there chainsaws for competition cutting, experiment with changing the timing by changing these parts or changing the keyway position.

I know this was not your question but I was concerned with asking about interchangeable. What are your model and serial numbers for your engine or equipment. The flywheel and parts listed above effect when the spark plug will typically fire at 10-15 degrees before TDC (top dead center), so its Not just a case of making all the parts fit. Remember as far as interchangability, the flywheel, crankshaft keyway, and position of the ignition coil effect the timing of the engine. 240, 335 XPT, 338 XPT and t435(fits models 137 & 142 Before serial number 2006100001). I would suggest a phone call to a local Husqvarna repair center, they may have access to the service letters for your model chainsaw, and can determine if there were any revisions made to your model. The model number of a Husqvarna chainsaw is printed on the side of the recoil assembly on the unit (eg. I do not know the answer to your flywheel question.

Husqvarna serial number lookup chainsaw