Stihl 064/066 56mm big bore 99cc build using oem and aftermarket parts

showing most of the build of this saw using oem and aftermarket parts...I show port work and share timing and suish numbers on this build...at the end I show the saw running and do a re-cap of the build....

[@sunflower-m3h]

AWESOME

[@sawinglogsandpowersaws4611]

Awesome build!, did you have to go with longer cylinder bolts using the 660 cylinder

[@JandSChainsaw]

👍👍

[@yankeenimrod2063]

I looking forwarded to seeing it cut! whats the reason that you don't want to polish the transfers? thanks

[@JandSChainsaw]

too smooth of a surface can cause fuel to puddle you wabt it snooth but not polished...

[@joescissorhands141]

@@JandSChainsaw Yup, this is advocated by both Jennings' & Blairs' books on 2-stroke performance (Blair calls it 'cleaning out the dingleberries' ROFL, true beavis&butthead throwback right there!) There's definitely reason to want it "fully flattened & perfect" but insofar as "should you finish it at 100grit, or 500+ grit smoothness?" isn't something I can find hard answers on, many share your thinking of "fuel puddles" (and it *does*) but at the same time a rough surface automatically creates eddying of the charge(slower movement of the near-wall portion of the charge), I've yet to find any actual "this is the right level of roughness" for intake/transfer tracts, my instinct is that it should be in the 100-180grit range if one were just using sandpaper to finish, which I actually do a lot IE finishing my ports by-hand, I like leaving the last ~5% for hand-files & sandpaper, really ensure everything's symmetrical & on-point (just finally finished my big bore, came in nearly perfect at 99//81//125 squishing under 24.5thou and over 1.25mm before-freeport!)

[@christophercollins2330]

Couldn't you fill in the elongated holes with an apoxy or aluminum filler just to ensure seal of cylinder and crankcase.

[@christophercollins2330]

I like with all of your timing numbers and how clean you chanfer openings. Should pull hard

[@JandSChainsaw]

Un needed

[@JandSChainsaw]

@@christophercollins2330 thanks

[@joescissorhands141]

VERY neat video!! You mention these 56mm piston-skirts NOT fitting the crankcase- you *sure* about that? I'd bought a pair of these 56mm kits (true cheapies, not Hyway/etc although my 54mm hyway jug is by far the nicest I've seen "off shelf") expecting & planning "That 56mm slug isn't gonna fit the case, but that's fine because I was already doing case porting to this unit", but then I received my 56mm kits....did you measure yours? The piston-skirts are 78 thou short, so you don't have to do the crankcase porting, I initially thought "well that is totally moronic, the intake duration is over 200deg on this thing" with the 56mm 1.160" pistons, but then realized that it's 1-or-the-other: crankcase porting, or simply JB-Welding the intake to whatever you choose, to match the shorter piston or go further, plus it's not like that prevents you from still porting/flowing the crankcase, and the pistons are lighter although they can't be machined as they seem to come like 5-30thou from free-porting out of the box! BUT, considering their comb.chambers are actually smaller than a 54mm's - by over 11% actually - the compression-ratio is already jacked-up on these jugs, if you wanted to put a pop-up in I'd bet that your compression is just around where you'd be aiming for w/ machining! Very interested to hear where this went, video being 1.5yrs old now is a good yardstick to hear how this unit turned-out, will check your library hopefully you've put an update but if not I'd be eager to hear all you could share on how this worked-out!! (PS the #'s on mine were initially awful like yours, I think I'm settling at exhaust to 148duration, intake came out at 158.5deg duration after JB'ing it and moving it 50% upwards lol, high compression, 10thou off the flywheel key and 8-pin sprocket, custom airbox custom muffler setup & heat-shield, gah I'll save it for the vid I'm gonna make on it ;D)

[@JandSChainsaw]

These were the very early 064 cases and most defiantly have to be opened up the later 066 and 660 cases dpnt

[@joescissorhands141]

@@JandSChainsaw Ah OK I gotcha! I'm younger(30's) and newer to this platform (

[@SONICTEAM-tj5fo]

What cc is 56mm Kit?

[@JandSChainsaw]

99

[@devonbonfy2506]

Hello, would you consider a similar build on my 064? Would you be comfortable sharing your contact info?

[@JandSChainsaw]

Shoot me an email it's under my contact info

[@devonbonfy2506]

@@JandSChainsaw pardon me, I looked all over, don't see email address, would you write it here or tell me where to look?

[@JandSChainsaw]

@@devonbonfy2506 jschainsaw2020@gmail

[@marksmopar609]

So is this basically a 088 jug?

[@JandSChainsaw]

dont think so,bought this one aftermarket....

[@marksmopar609]

@@JandSChainsaw ok thanks6.do you know if there is a company that makes a over bore that that just bolts right on.

[@JandSChainsaw]

@@marksmopar609 j don't think so if it's the older cases they need opened up..if you have a later 066 or660 to my understanding they are a direct bolt on..