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Received a clone 372XP the other day to learn how Husky's are set up and to have another go at porting. Ran it for ~ 5 minutes out of the box with 24:1 synthetic, worked and sounded right. Here's what I've found so far in a teardown:
- Unlike a recent G660 clone I ported, none of the fasteners on this one were loctited
- Timing as built with and without a base gasket. Very high transfer numbers seem odd
![G372XP Initial Timing Numbers.jpg G372XP Initial Timing Numbers.jpg](https://opeforum.com/data/attachments/391/391213-e8c9889270778e70a7d28da4276a877c.jpg?hash=6MmIknB3jn)
- Piston and single ring look OK, however there was some minor scuffing on the intake and exhaust sides:
![G372XP Piston.jpg G372XP Piston.jpg](https://opeforum.com/data/attachments/391/391198-2913fcd72c04f2b2123ea30917b193e8.jpg?hash=KRP81ywE8r)
Cylinder intake, some ragged edges are cause of minor scuffing on piston
![G372XP Intake.jpg G372XP Intake.jpg](https://opeforum.com/data/attachments/391/391200-88627883687b7cac6f7eb9b56d3a8039.jpg?hash=iGJ4g2h7fK)
-Cylinder Exhaust, more ragged edges
![G372XP Exhaust.jpg G372XP Exhaust.jpg](https://opeforum.com/data/attachments/391/391201-a0dc5b750ce7ab1b525d49162b60694d.jpg?hash=oNxbdQznqx)
Muffler is completely open inside, here's a concept for a deflector (thanks @drf256 !) to braze on the top. Gasket opening on the cylinder discharge is 0.94 square inches, plan is to drill a pair of 3/8" holes in the top of the muffler, open these up to an oval, then braze on the deflector.
![G372XP Muffler Mod.jpg G372XP Muffler Mod.jpg](https://opeforum.com/data/attachments/391/391203-a7847574365fef2003f872af5cf630f3.jpg?hash=p4R1dDZf7y)
Many thanks to folks that have posted tips on porting this cylinder. Goal for port timing numbers is 102/120/78. Special thanks to @huskihl for info on this thread that shows moving the transfers up to 120: https://opeforum.com/threads/372xp-port-timing-numbers.29031/
New Husqvarna 577 57 24-01 piston pin bearing will be used in rebuild, plan is to keep everything else stock.
- Unlike a recent G660 clone I ported, none of the fasteners on this one were loctited
- Timing as built with and without a base gasket. Very high transfer numbers seem odd
![G372XP Initial Timing Numbers.jpg G372XP Initial Timing Numbers.jpg](https://opeforum.com/data/attachments/391/391213-e8c9889270778e70a7d28da4276a877c.jpg?hash=6MmIknB3jn)
- Piston and single ring look OK, however there was some minor scuffing on the intake and exhaust sides:
![G372XP Piston.jpg G372XP Piston.jpg](https://opeforum.com/data/attachments/391/391198-2913fcd72c04f2b2123ea30917b193e8.jpg?hash=KRP81ywE8r)
Cylinder intake, some ragged edges are cause of minor scuffing on piston
![G372XP Intake.jpg G372XP Intake.jpg](https://opeforum.com/data/attachments/391/391200-88627883687b7cac6f7eb9b56d3a8039.jpg?hash=iGJ4g2h7fK)
-Cylinder Exhaust, more ragged edges
![G372XP Exhaust.jpg G372XP Exhaust.jpg](https://opeforum.com/data/attachments/391/391201-a0dc5b750ce7ab1b525d49162b60694d.jpg?hash=oNxbdQznqx)
Muffler is completely open inside, here's a concept for a deflector (thanks @drf256 !) to braze on the top. Gasket opening on the cylinder discharge is 0.94 square inches, plan is to drill a pair of 3/8" holes in the top of the muffler, open these up to an oval, then braze on the deflector.
![G372XP Muffler Mod.jpg G372XP Muffler Mod.jpg](https://opeforum.com/data/attachments/391/391203-a7847574365fef2003f872af5cf630f3.jpg?hash=p4R1dDZf7y)
Many thanks to folks that have posted tips on porting this cylinder. Goal for port timing numbers is 102/120/78. Special thanks to @huskihl for info on this thread that shows moving the transfers up to 120: https://opeforum.com/threads/372xp-port-timing-numbers.29031/
New Husqvarna 577 57 24-01 piston pin bearing will be used in rebuild, plan is to keep everything else stock.
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