How can I make my TBR7 as fast as possible?

[Tbr2d2]

Hey all,
I have a 2020 TBR7. Original top speed b4 the speedo needle fell off was 63 wot. I'm trying to get to 70 wot, that way 60/65 is more comfortable on the engine. I have an aftermarket 27mm carb (iknow its smaller) with a 102 jet that definitely got me higher revs (no I didnt try the 102 in the 30. Will that get me more?). I also switched today to the 17 tooth front. Seemed to gain me a few more mph (guessing by feel) and definitely seemed to take longer b4 I had to shift.

[culcune]

Not sure if the smaller carb will net you higher top speed, but your countersprocket swap surely will. Exhaust swap definitely will help, and someone with a TBR7 should be able to point you in the right direction.

[kingofqueenz]

2 words "down hill" ...

Just kidding

To be honest, I do not think sprocket size ( especially the 17 tooth front ) will increase your speed in top gear at wot ... it will just make your gearing taller.

Increased horsepower will come from increasing airflow in to and out of the engine.

Head porting, intake and muffler mods etc.

Not my expertise by any stretch, with apologies

[shiftclick]

2020 TBR7 owner too. Did the 17 up front and threw in a Mikuni knock off and I think the 110 jet. Also threw in a Uni style foam air filter and bypassed the onboard air box. Didn't make a huge difference, but did make a difference. My top speed is probably right around yours although it's new enough I am still breaking it in. There's a youtube video out there somewhere where a guy takes a 250 cc and swaps out the front and rear sprockets for various sizes and gives you a chart showing top speed, fastest 0-60, 40 pull, etc. Let me know if you can't find it.

[kingofqueenz]

Here's 3 vids...

[Mudflap]

A windshield and skinny street tires will help.

[JerryHawk250]

Free flowing exhaust and air filter. Sprocket change to a higher gear ratio and the best performance mod is the porting and decking of the head. At least a 30mm carb. Though there won't be a huge increase in top speed, it does do higher speeds with less effort.

[paulsstag]

Originally Posted by Tbr2d2

Hey all,
I have a 2020 TBR7. Original top speed b4 the speedo needle fell off was 63 wot. I'm trying to get to 70 wot, that way 60/65 is more comfortable on the engine. I have an aftermarket 27mm carb (iknow its smaller) with a 102 jet that definitely got me higher revs (no I didnt try the 102 in the 30. Will that get me more?). I also switched today to the 17 tooth front. Seemed to gain me a few more mph (guessing by feel) and definitely seemed to take longer b4 I had to shift.

After watching a couple videos on the KTM 790 S a KTM 790 R and the difference in commuter and highway travel was a bit of a surprise . One of the guys testing at different speeds on an interstate said the front fender itself played such a big roll on how they felt. The R model has a high fender and S model has a fender close to the tire .

It has been mentioned here before that the front fenders act like a big parachute . Just reading the other posts on this it is possible to change the gearing to get the rpms in the meat of the power band at a desired speed, as has also been mentioned is power mods that helps get up to those speeds easier and to maintain them once there.

Has anyone here removed the front fender and possibly the air deflectors on the fuel tank to make the bike more aerodynamic and see if the bike maintains speed better? It would be pretty quick and easy to try this, beside the ugly factor it is certainly worth a try.

Paul.

[2LZ]

If I lost 50 pounds, Q would gain quite a bit of top speed.

[Rocket tests]

I build rocket motors, that would get things really moving.

[Tbr2d2]

Ya I saw that 1 too! I need to check my history. Ya mines a knockoff as well. I'll try the intake info. I'm still stuck there. Thanks!!

[Bruces]

Three words “hyabusa engine swap “ ........’nuff said .

[shiftclick]

Finally got to take my TBR7 out for a top speed run after installing my +600 HP Hawk digital cluster...

[Megadan]

Gearing is the most crucial part of the the whole equation.
With the CG250 engine you basically end up with a top speed right around 7000 to 7500 rpm, and cruising rpms between 6 and 7k for highway use.

That being said... Without head work, with a full exhaust, intake, and a well tuned pz30 or vm26, and the right gearing it wouldn't be unrealistic for a tbr7 to have a top speed somewhere around 70 to 75mph.

[shiftclick]

Originally Posted by Megadan

Gearing is the most crucial part of the the whole equation.
With the CG250 engine you basically end up with a top speed right around 7000 to 7500 rpm, and cruising rpms between 6 and 7k for highway use.

That being said... Without head work, with a full exhaust, intake, and a well tuned pz30 or vm26, and the right gearing it wouldn't be unrealistic for a tbr7 to have a top speed somewhere around 70 to 75mph.

You are dead on correct. I was still at 6,000 RPM today when I hit 70 so I know I had at least 1000-2000 RPM to go when I ran out of road. So I think my 17t front and 46t rear (is that stock) would get up to 75 mph, but cruises easily in the 55 - 60 mph range without breaking a sweat. I bought the 45t rear, but not sure it's worth installing it. Thoughts?