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I have been working on a good example of an XS400 Seca. It is complete and unmolsted however it does have the wear associated with a used but not abused 30 year old motorcycle. The following has been completed: NOS rear Shock, Fork Seal, Tires, sprockets, chain, plug wires, caps, plugs, valve...

I have read through some of the posts for the dual disc conversion on an XS400. My question is what other fork lowers will work. I have seen an image of the XS400R as coming stock with dual discs but I have never actually seen one in person. I was thinking maybe the fork lowers form an RZ350...

I have been struggling to get my very short wife to fit on the Seca 400. In an effort to lower the rear of the bike about an inch I did the following: 1. measure relationship between ride height and -1 in. of static rear suspension height. It ends up being about 1/2 inch that needs to be...

Hi, Still working on my wife's XS400 Seca. It is rebuilt and running well but it needs new fork tubes. I disassembled and found deep pitting which is causing the leakage. I found some on the Race Tech website but they are imported from TNK. 1. Does anyone here have a resource for...

Front Brake Caliper question. Does anyone know what other Yamaha models use the same front brake as a 1982 Seca 400? Any thoughts would help. Joe

I was rebuilding the Carbs on my Seca 400 this saturday. Everythign went together really well. I did however notice one weird thing. The factory manual calls out 117 main jet for one cylinder and 125 main for the other. Can't remember which was which. THis is a vertical twin and so unlike...

Hi, I am writing to introduce myself. I live on Long Island in East Patchogue and have recently purchased an 82 Seca 400. I actually learned many years ago on an XS400. I now have the Seca running well. I am now onto rebuilding the brakes. I hope to take some detailed photos and post. I...