Porting Video #3 - Decking 2 Stroke Cylinder | BikeBerry

Join Tony from BikeBerry in the third installment of our Porting Masterclass series, where we delve into the process of decking a 2-stroke cylinder. This video is an essential guide for anyone looking to enhance their motorized bicycle's engine performance through increased compression and smoother operation.
Tony begins by explaining the concept of decking, which involves lowering the top of the cylinder by 1mm. This modification leads to more compression, smoother running, and reduced four-stroking. However, he cautions about the potential for detonation and recommends using higher octane fuel as a precaution.
The video provides a step-by-step guide on how to accurately measure and remove 1mm from the cylinder using calipers and a sanding disc. Tony emphasizes the importance of keeping the cylinder flat and even during the sanding process. He demonstrates how to use a blue fine tip permanent marker to make guiding marks on the cylinder corners, ensuring even sanding and depth.
As the process continues, Tony shows how to check the evenness of the cylinder head using calipers and how to measure the depth around the parameter. The final step involves polishing the cylinder on a glass table with fine grit sandpaper, ensuring a perfectly flat and smooth finish.
Tony concludes the video by reiterating the importance of precision in this process and encourages viewers to try it out themselves. He also teases the continuation of the porting and modifying series for motorized bike engines.
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Chapters:
0:00 - Introduction
Hashtags:
#BikeBerry #PortingMasterclass #DeckingCylinder #2StrokePerformance #MotorizedBicycles #EngineTuning #DIYMaintenance #BikeMods #PerformanceEnhancement #BikeMechanics

[@keeganhache6667]

Thanks for shouting my channel out your videos are gonna get out to more people than mine and help the community with great information keep it up 👍

[@tonytaylor5087]

Glad we’re adding lots of clarity to this topic by breaking it down step by step.

[@joeypriolo]

Insane how long bikeberry has been around and videos like this are coming out this late.

[@glenngray6895]

Also don't forget to chamfer the bore slightly and the bolt holes

[@normanperry4336]

Your porting videos are saving me money thank you

[@makscampbell]

Great video

[@EthanSlater-cl9ru]

this is definitely a good way to do it without a lathe

[@glenngray6895]

Wow that's a crude way to do that. Fly cutting on a Bridgeport is the best way to do that.

[@glenngray6895]

Also when you're standing on your glass table top use a figure 8patern that way it will stay flat

[@MRONETEN]

Personally I would just shave the head down by 3mm and use a skinny gasket so it improves the engine further also stopping the 4 stroking

[@motorizedbicyclenation53cu90]

Let’s see a video on the new bullet train exhaust pipes

[@alvinpeoples6877]

Hey what if you done have stuff to do is

[@anthonystidder]

can i add a 70cc barrel and head to a 50cc crankcase?

[@dogswhistlesharam9029]

I really wouldn’t recommend doing it this way, it should be done on a million g machine..sanding it like this won’t give you a flat surface to be gas tight…🤔🤔🤔

[@tonytaylor5087]

Not everyone has access to a milling machine.

[@dogswhistlesharam9029]

@@tonytaylor5087 true,.. but everyone has access to a machine shop that does, there is a right way to do this and as a mechanical design engineer machining it correctly is very important, you can’t rely on the top fin as a datum for measuring it to guess if it flat or not as they are not perfectly flat. Also taking too much off can cause the piston to hit the cylinder head , your pretty much guessing with that measurement method and a disc sander. Using a milling machine means you know exactly how much material has been removed and that it’s perfectly flat and parallel. . There’s an old saying, if a jobs worth doing it’s worth doing well. Every engineer who knows what they are doing would cringe at watching this method…🤔🫣🫣🫣

[@tonytaylor5087]

Sincerely appreciate the insight. The way I look at it is this is a fun inexpensive hobby for the most part. If I screw up a cylinder body by learning how to modify it then it’s only $20.00 to get another one and I learned what not to do. Some people may not be comfortable doing this by hand and that’s ok. They can take their parts to a machine shop and have them knock some off the top. At least they learned a new trick by watching this video. So to each their own.

[@keeganhache6667]

Mine seals up great you don’t need a machine shop to do it they charge A lot because their using those same big machines that they do in car engine blocks etc. They wanted $100 for putting a bigger piston on my 47mm

[@keeganhache6667]

Also take a $20 cylinder to a machine shop is not very practical…

[@kevinstamp1776]

Anyone who wants any compression don't do this . Flat surface not a round sander lol .

[@familyfree2994]

Really?