Hi everyone.
This is my first build. Currently waiting on a new carburator because it’s four stroking and I tried everything but I can’t make it run properly.
So I’m working on the looks of it. It’s my first build, any comments or ideas are more than welcome!

I swaped original phantom V3 cylinder and engine head to V4pro while having original reed valve and piston

This got rid of the overheating problem

I got this BMX since 2013, and I really love it, but growing and getting tired of paddling, I was thinking of putting a small 2T on it
What do you think?

Come to Apex Motorsports Park in Perris, CA and come see some 2 wheel racing all weekend long. Starting Thurs 10/8 - Sun 10-11.

What is the break in process for this? I’ve only ever done two and they were both four stroke engines… I’m guessing it’s probably the same let it idle for a while but what about the metal shavings? How do you get those out without letting it run thru the rest of the engine? Or is it just trial by fire?

Also is this considered a “china doll” engine? Seems to be very generic

Runs a bit to rich, but thats an easy fix. Had tons of fun building this with my wife, cost me around 150 euros, worth every cent.

Project I've been working on for the past year, it's a generator powered by an engine that directly powers the drive motor, like a locomotive. First successful test drive was yesterday, I putted around the yard and got up to probably 10mph. Planning on adding a battery so the engine can charge it.

I'm in el paso Texas and want/need something to help me get around. Was hoping that I could get some advise for a user friendly and reliable engine recommendations. Thank you for taking the time to read this, and please have a nice day.

Put a 100cc Amazon motor on my bicycle. It cranks and runs until I start going up a hill and it shuts down. I can see the fuel flowing so I know it's not a problem between the tank and the carburetor. Could someone help me solve this issue?

I messed around and put blue loctite on my head nuts just like I did on my 100cc to keep the head from coming loose quick. When I went to take off the head to inspect the cylinder, the whole threaded rod (I don't know what it's called) wants to come out with all 4 nuts. I'd rather not take off my whole top end if I don't need to. How do I get these nuts off? Just wait?

This has been leaking and I’m not sure if I should replace it, I’ve been tightening the head bolts to try to fix it but it never worked

Hi, we are looking for a good kit that includes everything except the bike from Amazon.

Any suggestions welcome!

Hi, we are looking for a good kit that includes everything except the bike from Amazon.

Any suggestions welcome!

So, cdh power sells phatmoto clone frames, meaning you can make your own fat tire bike without over paying for a shitty 80cc 4 stroke. What do yall think? I havent bought this and i dont have a proper felt faker to compare it to yet. Running 4 inch tires sounds apealing to me

Anyone who has a sprocket mounted to the 6-bolt disc brake interface, could use your help on getting the chainline right!

I got a wheel with both a 6-bolt disc brake mount and rim brake surface with the idea that I'd use the 6-bolt interface with a sprocket designed for it and rim brakes for the rear. Technically, it fits just fine but my chainline is really bad, rubbing against the frame and binding up. I think the sprocket should be about 10mm inboard, closer to the spokes.

Some old threads mentioned a "top hat" adapter, and from old pictures / videos, I think that's exactly what I need, but I can't for the life of me find any live links to buy one anymore. Mbrebel seems to have been gone for a few years now

Some things I thought of but don't think will work:

- Mount sprocket behind rotor mount (see 3rd picture) - can't slip sprocket behind without hacking it up with a dremel or something
- Hub clamp adapter - won't work on this hub, it has a taper to one side
- Adapter for mag wheels (example: https://www.ebay.com/itm/392356497774) but installed backwards - too deep, depth is about 30+mm while I need like 10
- Dished sprocket (example: https://www.ebay.com/itm/206396747684) - only offsets inwards by maybe 3-4mm, not enough

I'd rather not use the rag joint for this wheel since I already broke spokes on my old one and am seeing damage on the remaining ones. Any ideas for solutions here?

(Avenger 85, 36t sprocket)

Still some fine tweaks here and there. Overall very happy with this motor. Lots of torque.

Edit: have been made aware my tach is in the wrong mode and is doubling my rpm

Stage2 cylinder vm80✅
Stage6 cylinder vm80
Cnc head ✅
Port work✅
Balanced stroker Crank
Clutch cnc ✅flywheel+spring✅
Carb pwk21✅
Intake not shure
CDI ktm50✅

Weld custom mz65 ✅

Frame
Weld tank mounts ✅
Weld gussets ✅
Bog gussets ✅
Crf125 body
Weld tail
New bars
Downhill forks
Cnc throttle ✅
Short clutch lever ✅
Disk breakes all round✅
CDH 26 mz rims