My Saw Build Had A Failure! Don't Make My Mistake On Your Saw Builds!
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- čas přidán 9. 06. 2022
- So pretty much this goes for any Motorized Bicycle MS380, MS460, MS660, MS720 build you may want to try and make! So don't make my mistake on your build! Not much info on this so I hope this saves you some Aggravation! I lucked out just lost piston and some time! could of been a lot worse!
So like I have always said! You learn from mistakes! So when I cut my window back in build of this engine few old timers said the Piston would fail from the forces of it resting on the cylinder as it goes up and down!
As the crank makes it's full circle. It will shove lateral forces on the piston as it goes around. When I cut my window for this Type of piston it left to much of the vertical supporting walls with no support and all the force resting on the thin bottom section below the port!
Since I never considered any of the above when making mine nor did I see any postings about this! I had no idea it was even common thing till after my build was done! So I figured since it's already rolling lets see if it really fails or not! All about science right? Well it did folks! this one is true!
A piston with the Transfers cut into the piston design really does have this issue! They say a Good solid CIRCLE or oval is best and to leave a good amount on bottom end to support forces on it or to make a Rail down center of the piston to help prevent flex under load. Not really sure yet what I will cut in this new piston sitting in front of me! But hey we have 60 of them ready to die sitting in front of me! Science!
#bikelife
#bikers
#stihl - Auta a dopravní prostředky
At least you avoided major damage.....This video was actually very helpful, I won't be trying to go for the largest piston port hole possible.
Yes comming out with new piston video maybe today if I get time to upload it! Yeah for sure!
That’s probably the best outcome of a failure just have to replace the piston
lol yes!
Maybe do a piston port build next. I know it won't make as much power but will it not actually?
I have 5 of them right now being run around the area with a group of uber eats/door dash peeps that ride ebikes all the time! A friend has a small delivery thing going down with Ebikes said lets test them out! hes going to go in with me on ms460 builds when gets rolling! Making parts to already! Looking at drop in place yd100 Parts kits ready to roll type deal! BTW when go over post office later I'm ask them about over seas on one see how much it goes for round about and such!
@@BuildBreakFix
Hi , I was curious as to how much a 460 build would be including postage to Australia ,
Thanks Rob.
Lmao! So lucky, everyone wishes that would happen. Right out the pipe! Ate it.
Was amazing how lucky it was! I got the whole part 100% to lolz fell out of the pipe after tipped it up.. was like damn!
@@BuildBreakFix lol
@@BuildBreakFix that's crazy. I'm still amused about what happened. Lol
What's the smallest hole you can get away with on a piston for a reed valve . I'm just throwing an idea out here but maybe we don't need as big of a hole in the Piston as we think. It just seems putting any sort of hole in a piston just messes up the integrity & seems to wear a lot faster.
Yes! Way to big of a hole. Fact transfers are part of the piston. Huge part of the load ends up on those sides! I did make a new one. A lot smaller/ whole different design. Zero change from large hole. Still runs nearly identical. Hole was 20mmx15mm in failed piston. New one has 2x 8mm slots 16mm long and smaller center slot of 8mm by 10mm long little over half that first one! czcams.com/video/nZshtk0nQNY/video.html
2- 4mm wide slots with round ends will do the trick, cut off from centre equally, length can be subjective to how much lower scavenge you want., You could go wider on each slot depending on your transfers
We dis this on our old 80's 2stroker karts for extra Oomph
Yeah the scavenger port is not able to be cut by the design of the jug. 2mm deep cut would leave 1mm wall!
Use piston port maybe…
Hard to on saw build. Walls are very thin above the base 3mm thick!
make it piston port next time !! it would still make to jam
boost port is not an option for this type of jug! no way to get the port into the case without a vacuum leak!
Ohh crap. Lucky jug is intact. Now what? Was it broke in?
yeah one been riding around on for a while now! I have a "pallet" of new ms460's sitting here lol! ༼ つ ◕_◕ ༽つ plenty replacement of parts! I honestly just F'd up and cut window wrong for that type of piston! Then got lucky it actually blew all parts out never touched a thing ..... Like what 1 in 100,000,000 odds jug never got a nick with half the piston exiting my engine lol! I'm buying a damn lotto ticket after that! 😆👍
@@BuildBreakFix So, we can assume the chosen window format/shape caused metal fatigue/ catastrophic structural failure, correct? Good to know. Scary too.
@@leonardarola yeah! Was a bad idea to cut it like I did just cause of it type!
Also, are you planning on selling a prepared bottom end, for a fair price ofcourse? I would be interested in a MS460.
we have been considering entire running build. whole shebang! basic design type stuff but with full function. like clutch a stock one would burn up 5 minutes. so testing a nice solid option fix it. copper bottom end gasket so easy to remove. got wrist pins with bearings! stuff like that! even went so far as to make stainless steel inserts for stud mounts all pain the ass shit most cant make cleanly with normal tools! mikuni vm22 carb. quality without bling! but functions well is point. looking at like 450 whole thing ready to run. just the diy top end kits in rang of like 175 but everything it needs to screw it inplace!
I'll bet a million dollars that there's tinny bits of that piston all over that bottom end ,I would take it all apart an clean it very good before putting it back together, ,
? Oh it has new piston in it! Yes I did pull it in half and fully clean it out! But I actually have the whole broken off part! But the 1 in 1000000000 happened and it went clean through into the exhaust!
deeezam my dude thats shitty asf like its aLL trial and error knowledge is power right destroy and rebuild then make her nice again
It runs! New piston is more solid!