About 65 (phone GPS) or 72 indicated. I have a 2020 TT250, and I have a 42 rear sprocket. I have rejetted. Funny I decided to rejet again on my 2nd oil change. I lost like 10 MPH up top. I backed out just about everything I had done (went from 112 to 117 main, needle from #3 to #4 and from 2 to 2.5 on the IMS, and then went back). One thing I should have realized would have cost me tons was a switch from 10w30 to 20w50. I changed that back out too. Now the bike is back to what I mentioned in my first sentence. Oh yea, the miss I had at WFO, got rid of that by replacing the "torch" plug with a proper NGK.

Top Speed: 68mph
Bike: Bashan Storm 250
Front/Rear Sprocket: 17/42
Mods: unifilter pod and outerwears cover, car customs exhaust.
Carb Tuning: 118 main 38/40 pilot depending on temp
Rider Weight: 225 lbs

70mph on speedo
Bashan Motomax 250
17/46
NGK, stock exhaust and airbox
110 main, 1.5 turns
190 lbs
16'

Top Speed Consistent 74-76 mph GPS (80 mph when the stars alien)
2016 Hawk 250
Keihin PE30 carb,125 main,32 slow. Pod filter
Ported & decked head 10:1 CR
Direct Ignition Coil
17/40 Sprockets,
NGK DPR8EIX-9 Plug
De-Cat Exhaust with Ebay muffler
Dual Oil Cooler
Rider weight 175 lbs

Elevation Ground Zero.

Bike: BMS CRP 250
Fakuni 30mm, 110 main, 25 pilot
Top speed: 60 on the dash.. so probably 55. And I was pegged, full throttle, slightly downhill. Shortly thereafter, my whole rear wheel flew apart. Nobody died!

Gonna go to a 40t on the rear soon.. let's see what happens! I think stock gearing is like 15/50 or something

All Bashans are geared with 17/46 gearing.

Where's Azhule when ya need him! Didn't he set the Land Speed Record on his Bashan WILL? As I recall, there may have been a sonic boom when he did it.

well, hopefully that 40t works wonders! It's already here waiting to go on

I have a 42 on my storm and I don't think I would go any lower. Pretty noticeable loss of bottom end. You get used to it and it does knock the rpm down a lot on the top end.

68 mph Brozz gps measured (new carb and exhaust, stock gears)
59 mph Hawk gps measured (new carb, baffle removed, 17t front sprocket)

Top Speed: 110 km/h GoPro GPS
Bike: Lifan 150cc
Front/Rear Sprocket: 17/46
Mods: 65.5 piston, PWK 28, enhanced ignition coil, Custom cdi, rewired and improved stator. Iridium NGK plug
Rider Weight: 180

85 to 90 kph with 15/45 gearing and 18 inch wheels.
Measured with GPS
125 ccm, 11 HP

Do you think the 9mph difference is strictly due to gearing???

53-56mph for us weirdos

Impressive for a 125cc! My first China bike was a crappy 125cc that peaked at about 45mph!

Yes. And maybe exhaust as well.