You're not alone

lets hope It's a positive casting experience

@@OddsandEndsMachining fingers crossed 🤞

​@@OddsandEndsMachiningwhy didn't you just get the original cases Tig welded then machine the excess back off on them broke cases from your other video or have I missed something ?

@@officialmysteriousrider130 I’m making an entire new engine, only using the gearbox internals from the first motor. That motor is an 800cc 4 stroke 3 cylinder. This motor is a 350-450cc 2 stroke 4 cylinder.

Thank you, pass on a link to his page if you can. The main reason for using a twin crank is off the shelf parts which will be available for a long while can be modified to work. An nsr style would require custom cranks which would cost a lot to make and mean you’re making a lot of spare parts to keep the bike running. Using NSR 250 crank parts might be an option, although those parts aren’t cheap and won’t be around for very long.

I think it will be even better than an RD500.

I’ll be dropping a video either tonight or in the next couple of days.

The bike up will fire the upper cylinders together, the lower will be the same. It will use 2 crankshafts, none of the crankcase sections will communicate with one another. I’ll do a video explaining the set up better.

Thanks, that would be cool. I always enjoy talking to like minded people. Email me if that works Oddsandendsmachining@gmail.com

YZ85 or I might use the Athena 112cc cylinders

@@OddsandEndsMachining so you’re going to use stock yz 85 stroke so the displacement is going to be 340 cc ? Are you going to try and package 4 expansion chambers ? This is super cool By the way I’m sorry to spam you but I’ve been wanting to do this myself . Not this in particular but my application will be snowmobile drag racing and I wanna turn 2 twin cylinder 2 stroke snowmobile engines into a three cylinder .

@@AnDrEw122100 ask as many questions as you want. Yeah, depending on the cylinder, it’ll be between 340 and 450cc. As you can get a 112cc kit as a direct bolt on for the yz85. It will have 4 chambers, 2 under the seat and 2 out the right hand side.

@@OddsandEndsMachining awesome I’ll be following for sure . Where are you from ? Australia ? I have a friend from there he tracks motorcycles as well he’s from Adelaide .

@@AnDrEw122100 New Zealand, just a bit further south, at least there are a few tracks here and you can ride year round.

I should do a recap video once the casting is done, but here you go. -Yz85 cylinders for the prototype but YZ112 for the final product. (Really only a 450) -This uses standard Yamaha cranks. . . Cheap and fast to maintain/get spares for. -Contra rotating on a standard YZ85 crank with a 20mm shaft would create a very weak point, using an intermediate shaft allows each crank to see very reasonable loading. -it will fire in pairs like a 90 degree v twin for good balance and drive ability. -case reed as per the YZ85

@@OddsandEndsMachining How much total output are you hoping to see? Will it be using larger bore 85cc cylinders only or will there be added stroke?

@@BillyWillicker a really hot 85 can see around 30hp. It’s a bore/stroke kit it should be good for a around 35ish Hp as a 112. It could make between 120-140whp

@@OddsandEndsMachining I'm more versed in 200-250cc(stock size, mod to larger usually 240-330cc) cylinders but what are your planned durations, T/A targets, and RPM range that you're looking for? Getting it piped for a reasonable power spread may be difficult, even with the torque of multiple cylinders. Also, what fuel and compression target?

@@BillyWillicker -98 pump gas -12-12.5:1 -13,000rpm peak power -timing is undecided but it will probably end up somewhere around 196-198+ on the exhaust and 130ish on the transfers. -I’ll design and make the pipes, the beauty of the high rpm is that I can make them quite short and easy to package. Due to the lack of power valve I will probably add an ATAC style chamber to boost the low end power, but obviously the plan is to build off a stock YZ85 and develop it slowly.

Extruded Polystyrene or 'XPS' for short

The foam sheet is 50mm thick it comes in 600x1200 sheets.

Yup thits bout right brew

@@jameshatton4405 Sweet as bro.

@@HeathLedgersChemist can I say it? I think I can say it "Ey brew wanna chup? A potato chup?" 'oh nah brew I can't choo brew? I don't hiv teef? I only eat plinkton'

We gotta join en ind take the puss hahaha I don't think he noticed the mullimetres and thuck to notice you takin the "puss" brew (hence I umphasiised ut with brew hoping he'd citch on? But now I'm the only one left lookin thuck😆)