Makita/Dolmar Big Bore vs. HD air filter kit

[Desko74]

The AM big bore will probably work just fine.

I've had both (OE 79cc and AM 84cc), and power is very close between the two, but I believe the OE parts are better quality. Most big bore kits do come with crappy two piece rings... If it was my saw, I would replace the ring with a good Caber one before installing the new top end. I would also check the clearance in the squish band area, as a lot of AM cylinders leave too much clearance, which lowers compression. You may be able to run without a gasket if there is room. The HD filter is not a requirement and won't add power over the stock filter, although it may last longer between cleanings.

Thanks for your correct answer!

 

[cgraham1]

That was me. I was having a hard time tuning one after porting with the HD setup. Changed it back or just took the filter off and it gained 10% power. It does filter better and will probably keep the intake skirt in better shape til it's wore out.

Shoulda known it was you, Mike.