performance

A while back I purchased a 48mm big bore cylinder kit to install on my 2 stroke engine from MZpartsmiami. However I ran into problems with piston height at tdc meaning I needed a spacer. The piston that came with the kit was already scratched up when I received it and it seems to be pretty soft...

Going to get zio reed and carburetor, expansion chamber, high compression head and high performance cdi, which of these motors will be better for these modifications? https://www.bikeberry.com/flying-horse-66-80cc-epa-approved-black-angle-fire-2-stroke-bicycle-engine-kit.html...

Been wanting to build a bike for awhile. This is my first build and I Plan on this thing screamin up and down the road I live on. This echo leaf lower engine is pretty fuckin strong and well I work on the damn this ALL day so I figured “why not put it on a bike”. I have a mongoose bike I found...

I bought an HP Performance carburetor for my 2-stroke motorized bicycle to replace my NT carburetor. As of right now, my NT carb blows the performance carb out of the water. I'm guessing a jet issue? It cranks right up but, lacks power, torque and top speed. Anybody have ideas about what jets I...

I bought an HP Performance carburetor for my 2-stroke motorized bicycle to replace my NT carburetor. As of right now, my NT carb blows the performance carb out of the water. I'm guessing a jet issue? It cranks right up but, lacks power, torque and top speed. Anybody have ideas about what jets I...

Hey I'm new to motorized bikes (my first engine is still shipping), and I was wondering, what are some good performance mods to do on a cheaper budget, and in what order? I was thinking to do: -Exhaust -CDI -High compression head -36 tooth rear sprocket -?

Hey guys just wanted to ask what carb setup you guys recommend for a 48mm bore x 41mm stroke engine I'm building. The ports are 40mm. Would a 19mm delorto clone with a #90 jet be good? it is a iron lined cylinder.

So it all started when a screw for my exhaust broke inside the cylinder I tried to remove it every way possible, sadly it didn't work. I then got a replacement one online, when installing it I tightened it to much to the point that the cylinder head cracked. Unaware I tried to ride it and ended...

So far I’ve replaced every sh**ty, self stripping nut and bolt I can. I live in the US so finding metric bolts is sometimes a challenge. I reinforced the engine mounts and chain guide and placed make shift rubber shocks between the frame and the engine to stop it from shaking so hard the chain...

I ordered a new bullet train 80cc motors and I was wondering is it safe to use performance parts on it like a sbp expansion chamber and other things like reed valves and a speed carb.

Hi all, Sorry if this has been covered before but I am new to this site and have not been able to find the exact information I have been looking for. I am currently in my last year of a Mechanical & Manufacturing Engineering degree and my final project is titled as follows; "To improve the...

So I got an old chainsaw that works very good. I also have a motoried bike with an engine from one of the kits you can buy. Would the chainsaw engine work better than the one from the kit? I know I made a thread like this earlier but this is more specific to my build. The current engine is a...

Quick story Old bike frame broke while riding. The frame had snapped right above the rear mount due to a small crack that got worse after a month of engine vibration. (Vibration isn't bad, I used the frame with knowledge of the crack) During my ride the back wheel seized and I slid to a stop...

originally I had the voodoo brand I think of banana tube expansion chamber that came w/ the kit I ordered (IIRC i talked the guy into throwing it in cuz I got a aluminium gt frame kit plus a relatively premium engine kit at the same time) but I had problems w/ it not quite fitting, then when i...

I recently completed modifications on what was called a "Fatty Performance Pipe", replacing the "banana style" pipe I had, and am I ever pleased. The header pipe is a nice piece from CR Machine. I had to extend the header and add bends etc. to get it to fit where I wanted it, and modify the...

Does anyone know if it really makes a difference what kind of gas you use to enhance performance?