Motorized Bicycle MS460 Build "BabySawZilla" - Part 4: Building The Crank

[@dmoore0079]

I like how you broke down the individual weights of all the bottom end components and the amount of weight reduction at different drill depths with a given drill diameter. I just did one on the drill press at work, and can't wait to reassemble it and see how it does. Thank you for providing us DIY folks with all these resources!

[@BuildBreakFix]

Here! I made everyone a cheat sheet weight video! You use the values I listed as I weight all parts your good to go if you know how much the piston weighs for a build ya try! kzbin.info/www/bejne/mWOzeqCEr6ionNE

[@TheLouisamite]

Thank you for sharing this with the world, ,iv learned lots of different things from you, keep up the good work, ,

[@BuildBreakFix]

thanks!

[@TheLouisamite]

Yeah you got lucky for sure there my friend, ,that's a very hard thing to make happen, you nailed it

[@BuildBreakFix]

What did I do now? ever time I nail something my wife yells at me to take the f'n 500 nails out of it now lolz crank? lol You think that ones nice! Should see my 46.5mm piston 50mm stroke crank all stainless steel with carbide crank weights! took me 3 moths cut that thing from 4 inch blocks stainless lol! Thing is like riding harley thump thump thump idle smooth glass when you ride it though!

[@Ragz10]

Do you a tutorial to build the puller i need one dont wanna throw out my crank (big bearing came apart)

[@BuildBreakFix]

Already is one. Look for the section you need in the description. kzbin.info/www/bejne/bYTClZ54bNGNerssi=eVKsdLEl0RBKon-Z jump links below it

[@Ragz10]

@@BuildBreakFix thanks have a parts list? Also where would I get the center pin if that's bad?

[@untitledduck9675]

I'm doing an ms440 build what balance should I do I already have the simple 3-hole balance on my 40mm crank with the big hole in the mid and the 2 small holes on the side? IM stuck on having a good balance for my engine, it would be nice if you could help me get a simple decent balance

[@BuildBreakFix]

There is no 100% sure thing. This was my ms460 52mm crank. 54 mm crank is different of course. Lots things to consider videos linked explain it all. Here was my 54mm one if gives you an idea what your in for! kzbin.info/www/bejne/gXWmlYafab-brc0 Everything. With cheat sheet on part weights in this video how to balance a crank correctly kzbin.info/www/bejne/mWOzeqCEr6ionNE Correct timing on ms460. Don't screw up your squish like most do. It should be 1.4mm ish when your done and it will run forever little error! These top ends are designed that way* With more power then you need. Easily drive 32t or 30 without effort on starting out. If you want a screamer do pop up piston instead of screwing your timing up. kzbin.info/www/bejne/mGLFYaqhZst7adk

[@untitledduck9675]

@@BuildBreakFix also can I use a 40mm stroke crank won't the piston hit the top of the cylinder if it does can't I use some gasket that will raise the cylinder or make a spacer to counteract it

[@BuildBreakFix]

@@untitledduck9675 ms440 is a 34mm stroke build! so if you used a 38mm crank with 116mm rod (any high hole rod) you would need a spacer of 2-3mm on a 80cc china doll bottom end to get squish of 1.2mm like that ms440 required to function correctly! never built one personally but just looking at specs listed for it. That would be my guess! 2-3mm spacer for those. not the piston striking top inside so much it's the piston striking plug tip about 1 mm past tip of it. If you used a (40mm Crank) your timing would be off by 11 degrees on intake and 7 degree on exhaust making it run pretty rough. The exhaust wont be fully open! 38mm crank you will be off 2mm each direction of the piston from factory! 40mm crank you would be 3mm off! which does not sound like much but when ports already don't fully open close on 38mm stroke cause lowest you can get. Extra 1 mm really does make huge change!

[@untitledduck9675]

@@BuildBreakFix so it is possible i can use a spacer? From my understanding from what your saying is running a spacer it will effect the engine performance

[@mikemiller3303]

Dam bro you are very knowledgeable about these motors and nice work I chatted with you yesterday have another question on my yd100 rebuilding the top half when changing the rings piston and wrest pin bearing do you have to replace the cylinder head someone told me you want them both new so that they can marriage together better your opinion if I need a cylinder I can get a new one from Amazon no problem

[@BuildBreakFix]

In an idea situation yes! you want both new! chrome liner normally will flake when you add a new piston into the mix shortly down the road! btw if you like to use NGK plugs! Super nice hack when installing new head! some place on that play list yd100. I cut 2 fins with hack saw did whole how to makes adding any plug you want super easy!

[@BuildBreakFix]

kzbin.info/www/bejne/nqqTkHZoaZZrb9U

[@mikemiller3303]

@@BuildBreakFix bro I seen that video I do that so I can use any spark plug 1 more question how come the cast iron minaralli cylinder comes with a window piston and the athina minaralli aluminum cylinder piston doesn't have a window just a little notch and the piston is perfect 47mm I thought when you have Reed valve you have to use a window piston?your thoughts do you have to have a window

[@BuildBreakFix]

miller okay the iron ones have windowed piston. The aluminum one your mentioning has a boost port. The reed window is cut into the jug wall. I have a yd100 with one I'll link a video of it.

[@BuildBreakFix]

@@mikemiller3303 kzbin.info/www/bejne/aKelYnt9oq2iqtk. Now it shows a boost port. Dont try it on a yd100. This was a science experiment that worked but was near crazy for a yd100 build. So close to ring snag cause of it. Buy had to be tried lol. Minarelli though is designed for it. Yes that's a yd100 I cut the top off it 😁👍

[@eamonohanlon5758]

Brilliant work 👍

[@BuildBreakFix]

I hope so LOL! will know the day we hear it run !

[@handymanusa3016]

Omg how do you take that shit apart

[@BuildBreakFix]

Hey gear pullers! Takes 3 second lol 🤣🔧 kzbin.infoCgv7aBkpQnA?feature=share

[@handymanusa3016]

Thank you I'm so dunb

[@handymanusa3016]

Dumb

[@BuildBreakFix]

@@handymanusa3016 only dumb questions are the ones not asked. Everyone learns it from some place cause they asked!