Mastermind
Work Saw Specialist
The second has already had the base mounting holes slotted to fit an 064 case. :monkey:
Anything else?
The second has already had the base mounting holes slotted to fit an 064 case. :monkey:
Anything else?
The first one has port shapes like a 660 cylinder. The second one looks like a big bore and it looks like it's timed more like a red-light cylinder with similar port shapes.
The exhaust port in the second cylinder is very squared-off looking.
Damn you are good.
The first one is a Stihl branded 660 cylinder......I just wondered if anyone would call it. :msp_thumbup:
How's that jug look compared to this one?
This is the free porting we are speaking of.
See the way the piston skirt is above the floor of the exhaust?
The Stihl brand on it doesn't make it any better.
Well it made it over 200.00 more expensive.
Confessing that I have never fully rebuilt a 2-cycle engine. I saw and understand the "freeport" on the Mako 066B. Looks to me as if that could be cured with thicker or additional gaskets below the cylinder. But that would decrease the compression. Wonder if that "freeport " is deliberate? If so, why?
Not deliberate but you have to think about your fuel path. Excessive free porting can cut the fuel charge in the crankcase by letting it out the exhaust, thus cutting the fuel charge to the top end an possibly reducing lubrication too... Right?
That free porting problem can be solved by the manufacturer adding some length to the piston skirt. In fact if they wanted to sell more they would add extra to the skirt so that builders can feel free to shave the cylinder and drop it for more power without free porting.
Adding length to the piston will make it hit the crankcase on the big bore or when putting it on an 064 case. I've used a 395xp piston in those type jugs before but the squish has to be cut and a spacer plate has to be installed under the jug. Not to mention the mods to the piston and a different wrist pin bearing.
That Mako jug will have to be redesigned in order to be a bolt on product.
Need some tester still!
Bunch of guys responded and have received PMs from me. I still have some models available at this reduced price. Only thing is most of you have asked for the same model and I'm only carrying one of some models. Need some others to respond with some different size models.
Enter your email address to join: