kingOFgEEEks
Pinnacle OPE Member
- Local time
- 5:21 PM
- User ID
- 843
- Joined
- Feb 9, 2016
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- 1,734
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- Location
- Tioga County, PA

OK this really has my attention. What the heck is a pop up piston? Is this little 290 going to implode if I nearly double the HP? What I mean is will all the peripheral components hold up? Like crank bearings, clutch shoes, etc.
The 290 chassis shared 90%+ components with the 310 and 390 (55 / 60 / 65 cc ) The only real differences were a larger bore piston and cylinder, and I believe the 390 had a higher output oiler.
HL Supply makes a 390 top end kit, and a 390 piston with a pop-up (raised/domed area on the crown of the piston to increase compression), that will bolt right on. If you're not up to it yourself, I'm sure one of the competent builders here could do it for you, and replace the bearings and seals while they are at it, as cheap insurance.
This would definitely increase the power of your 290 substantially, and might be a good way to bridge the gap on the smaller end of saws.
Personally, I would look into a Dolmar/Makita 6400 / 7300 / 7900 series saw, though. Any of those 3 models would outshine your 290, and have excellent anti-vibe. That is my primary firewood saw (I have a 7900), and then I fill in with lighter saw when you can afford. There are plenty of good small saw options out there, so pick one that makes you happy.