Blais Racing 7oz Heavy Flywheel For TC250

What it is

• 7oz Clutch -mounted flywheel weight.

The name says it all. The Blais Racing 7 oz Heavy Flywheel is in simplest terms, a weight that’s added to the rotating mass of the engine. Where this product differs from other options is it’s location. With no easy way to add weight to the flywheel under the ignition cover, a common option for many bikes, the Blais crew found an alternative. They made a 7 oz weight that mounts on the face of the clutch. It looks like a perfectly machined giant washer.

How it works

• Easy install.
• Less noticeable than an ignition mounted flywheel
• Bike still has aggressive characteristics.
• Easier to ride.

Installation is simple. Lay the bike on it’s side and remove the clutch cover. Once off, remove the six screws on the face of the clutch, place the weight on the clutch with the six holes lined up and insert the provided longer screws and tighten it back up. There’s a few things to keep an eye on during installation, but the instructions are clear and easy to follow. It’s a quick enough job that it could easily be installed or removed for some fine tuning, even at the track.

Increasing the weight of the rotating mass inside the engine changes the characteristics of the power delivery, handling, and even how heavy a bike feels. Adding 7 ounces of weight is a subtle change, especially on the clutch, but it’s noticeable. More weight means the revs build a little slower which makes it smoother, more tractable, and less prone to stalling. Since it is on the clutch and spinning a lot slower than the ignition flywheel/generator the weight has less of a direct effect on the power delivery and the handling of the bike. Obviously, adding weight can’t increase horsepower, but if the rider is smoother and makes less mistakes, they may very well see some improved results. For me, it’s a compromise I like.

The extra weight certainly doesn’t make the TC slow, even with the heavier flywheel, it’s still an aggressive race bike. It’s just gives the bike a more settled feel, making it a little calmer and easier to manage without the perceived heaviness that can come with a lot of flywheel. Adding flywheel weight is a balancing act, a little on the right bike may help, but add too much and it will start feeling like it just gained 30 lbs. Funny how that gyroscopic effect works. Since we’ve been taking our motocross focused TC 250 away from the track and out into some more off-road type environments, we felt the aggressive nature of the TC was a little much at times and a little more flywheel might be a good addition. After logging quite a few miles at multiple locations, most of our riders agreed that it made the bike more versatile and a little easier to ride. Bottom line is it’s hard to find fault with Blais’ creation, it’s simple, does what it’s meant to do, and at $59.95, it won’t break the bank.