Concept2 Forum

I have two model D updated (black) rowers that have the same issue.

When you start off pulling, there is plenty of tension and it feels like a normal rower.

As you start pulling faster and harder the chain will all of a sudden lose all resistance causing you to fly off the seat.

I checked the website and it says that it could be the clutch in the flywheel. I oiled the clutch and the same issue is happening in both of the rowers.

The website said I would need part 2940 but when I search the site I can't find any where to purchase the part.

Any help would be appreciated!

Are you using them at low temperatures? That will affect the operation of the clutch.

I think this is what you would need:

https://shop.concept2.com/parts/394-14- ... &results=8

Edit: But if you're going to replace the sprocket you should probably also replace the chain.

This P/N is both: https://shop.concept2.com/parts/83-nick ... ocket.html

The clutch bearings are stuffed.

They are very hard to replace and if your in the USA you would just replace the whole flywheel.

The correct Concept 2 factory fitted bearing is the KOYO RC-121610 with the plastic Nylon cage, if you want a better bearing that engages faster and can take more load then use the KOYO RC-121610-FS which is the stainless steel leaf spring version but its like 3 times the price but that is what I fitted to mine after the nylon one failed.

They are a tight press fit into the hub and you need to make an extraction tool to get it out or have access to a press. You cannot use as hammer to just bash it out and bash a new one back in.

Earlier posts in a different thread also said something about flywheel balance, and that replacing just the sprocket was not the repair of choice because the flywheel was balanced as a unit. Not sure if I have this right, Carl who posted above would know, or maybe someone else can correct.