Rejet Stock Carb – Aftermarket Carbs – Carburetor Jetting Chart
The easiest and most beneficial thing you can do to the Tao TBR7 is adjust the jetting on the stock carburetor. I actually suggest that people do it during assembly as the bike runs lean otherwise. Typically these bikes come with something around an 88 main jet in the carburetor. You will likely need something closer to a 110 (factors including, but not limited to, elevation and other mods) will affect the jetting. There is the possibility of buying a nicer carburetor, but the simplest and cheapest solution is re-jetting the stock carburetor. For other carburetor settings, please scroll to the bottom of the page for Carb settings and responses from others
Cheapest Solution: Re-jetting the stock carb:
Pros: Cheap, Keeps cables choke in place
Cons: No good pilot jet selection
Tools needed: 10mm wrench (not socket), phillips head screwdriver, small blade screwdriver, and a hacksaw or small dremel.
Product needed: Jets for stock TBR7 carb. Using this link helps support TBR7.com, but I can personally state that these jets are good and work on a 2021 TBR7 (actually, on 4 of them I’ve built!)
- Turn your petcock to off
- Optional: Drain your carburetor to avoid a mess (take the fuel line hanging out the bottom, put it in a gas can, unscrew the carb bowl drain screw)
- Remove the fuel line from the petcock
- Unscrew (phillips head) the band holding on the intake
- Remove notes holding carburetor on (10mm, don’t drop the clutch side.. it can drop into the stator cover)
- Yank the air intake hose off and bend out of the way (this is easier if you remove the side fairing, but not necessary)
- Pull the carb off its studs
- Unscrew the throttle linkage (no need to remove the need from the plunger like he does in the video for a simple rejet, he did that to adjust his needle)
- Unscrew the choke cable (phillips head – not in the video). After unscrewing the bracket you can move the cable to a position where it is removable
- Take the carb, and dremel, or very carefully with a hacksaw, slot the screws
- The air fuel screw has a brass cap (2021) or plastic (2020 and earlier) over it, you can just pop it off
- Using a small blade screwdriver, unscrew the screws holding the bowl on the carb
- Find your main jet, unscrew it from the seat (It is very small, you may need to hold the brass seat while unscrewing)
- Check the number, likely much lower than 100, replace with something around 110 as a starting point unless you are at extremely high elevation. Ask on the forum for specifics if you have modifications that affect air/fuel.
- When replacing, screw it tight enough. I have seen one just rattle itself loose.
- Reverse order assembly.
- DON’T FORGET: Turn your petcock back on, close your carb bowl drain screw if you used it.
Aftermarket Carbs:
Pros: Cheap-ish, pilot jet adjustability, easy to install
Cons: Quality is subpart, off-brand jets are hit or miss on sizing, lose cable choke with some modificaiton to carb
If you are looking to just replacing your carburetor for a slightly better carb that can be adjusted more easily, the PZ30 cable choke carb is a great option without jumping to the more expensive carburetors. You’ll still need some jets to adjust properly (start around a 110 just like above):
Pros: Performance increase, great adjustability, good quality control
Cons: Price and may run into fitment issues
For a ‘Stage 2’ upgrade, you would move up to a higher end carburetor. The general consensus is that the Nibbi is the top of the line for this engine. The old suggestion was the 30, along with all the recommended mounts and airpod filter, but I now recommend simply getting the flanged Nibbi below, and just widening the airbox intake to keep your bike weatherproof!
For the 30mm Nibbi carb you should purchase the intake manifold air joint listed. You will need to trim about 1″ off to make the carb and air filter fit correctly. You can go with a smaller, cheaper intake but you will lose the ability to port match later to this intake.
And then the needed accessories:
Carburetor Jetting Chart (CG250 – TBR7/Hawk/Others)
And now for the Carb Jet chart. Please input any data you may have if you believe you are tuned correctly. You can go directly to this sheet HERE if you want to view all data. Please don’t add your data unless your bike is actually running well!
If you’ve never jetted a carb, watch this first:
You can download the live carb jetting file here if you’d like to filter it: HERE
If any items are out of stock or you find broken links, please use the Contact page to let us know.