Відео

Not bad, but I think we can do better! Just noticed the double up on the conclusion, you can ignore that :-)

What happens to the powerband when you cut an inch of the exhaust header? Let's find out!

I've ordered a second cylinder to play around with some light porting. I plan on doing a before and after crank balance too with nothing else changed to see if it's worth the effort. This motor vibrates like crazy, it's so bad the engine mounts came loose after a few pulls. It seems like a good candidate. Initial impressions of the kit: 40 minutes to remove the engine, swap piston and cylinder ...

First pull after raising exhaust port timing to 167deg (from 145), exhaust widened 6mm, transfers raised to ~112deg, transfer roof angle adjusted, Transfers widened and port matched to the case, intake widened 2mm. Custom hydroformed pipe tuned for 8k RPM. PWK21 carb with high flow manifold. 32t rear sprocket, 27" tires. Carb needs tuning down low, or more likely a smaller carb. peak RPM 10,600...

Will a fat belly expansion chamber really make more HP than a correctly sized expansion pipe? Let's find out!

Is a PWK21 too big for a BT100? Looks like it isn't! Not even tuned and running extremely rich it still makes more power than the stock, or modified BoFeng carb. Looking forward to the jet kit arriving and we can start tuning this monster Sorry about the wind noise, I've muted a lot of it and replaced it with the tunes below: 8bit Dungeon Boss - Video Classica by Kevin MacLeod is licensed under...

Should we wait for the correctly sized VM18 to arrive? Or try our luck with the PWK21?

Today we're testing my new BT100 (Sold by @tdrmoto in Australia). With our custom expansion chamber and high flowed carb we're seeing just under 7.5HP! I'm expecting 8-9HP once our VM18 carb arrives and we get the jetting dialed in. This pipe is designed for the BT100 stock port timings and with a power peak at 7000RPM. Now that we know this motor will rev out to 10,000RPM, we'll redesign anoth...

Made 6.75HP on the dyno at the wheel. Limited by the stock BoFeng carb. I'm estimating 8HP when the VM18 arrives full video out soon

ChinaDoll inertia Dyno mk1

custom sand cast manifold for the 80cc china doll tillotson Chainsaw carb.

Hydroformed two stroke expansion chamber (66cc / 80cc motorized bike exhaust) - first try!

TDR Moto cylinder and piston performance testing

80cc motorized bicycle performance mods - part 2 - Exhaust testing

80cc motorized bicycle performance mods - part 1 - Free mods!