XJ650 Maxim basic newbie/mods questions

Maybe someone else could help out with this. Chacal says that the guy holding the auction believes the seca has 35mm fork tubes and the maxim has 36mm. Personally I have never heard anything like that nor could I understand putting out two bikes where the only differences are the body style and foot peg position. It just doesn't make sense to me logistically to have a major component differ between two bikes that are so similar. If anyone can help with this, I am going to see what I can find out but I won't be able to do so until much later today.

 

I think the angles of the mirror and lever mounts are different between a maxim and a seca. just something to be aware of.

 

Allright, I asked a couple folks more knowledgable about XJs than myself and here is what I came up with...

The two different turbo years had two different fork tube diameters --
neither of which was 35mm. The original 1982 LJ had 36mm forks, same as the 650 Maxim and the 650 Seca. The 83 had 37mm forks.

Another issue might be the axle position. The Turbo axle is aligned with the
forks, designed to suit the 27.75° rake. The Maxim has a leading axle design
for it's 29° rake. Putting Turbo forks on the Maxim will increase the trail
which will affect handling, making it heavier at low speeds.

 

Robby you make a good point. The angles are different between maxims and secas due to the sweeping handlebar style on the maxim. When I swapped out my bars I decided to go completely aftermarket to combat the difference, i.e. new mastercylinder (vice rebuilding the old one) and a new clutch control mount.

 

One more thing I haven't seen mentioned:

My 82 Maxim 750 has air-adjustable forks. There is a "tire valve" that connects to the forks, and you run them with about 10psi of air.

The forks have a c-clip groove that holds the inflator assembly near the triple clamp. They also have a hole in them where the air enters.

I don't know what bikes have "inflatable" forks, but if you don't have the whole setup, they won't be good. I guess you could plug the air hole and ignore the c-clip groove. Might need stiffer springs than stock.

Just my 2-cents.

 

Since your working on an XJ why not keep it XJ
If you look on e-bay do a buy search with key words XJ700 you should find some front end assys. If not today maybe tomorrow.
Some of the wrecking yards listed in the listings like pinwal have all the info you are looking for and when the right one comes along youll be ready.
By the way XJ700 has dual disc brakes on the front

 

Just to let you know that XJ650 comes with dual break discs at the front. Please see photo of my bike it's a first reg. 1984 but I think it is a 1983 model 650 4Ko

 

And another photo

 

Holymoly! This is the oldest thread I've ever seen resurrected! How long since Chacal had noob questions? That's frikking crazy!

 

hehe. yeah. I know. but I thought this might help someone.

 

I think that the 550's euro models came with dual front disc breaks as well. They just didn't make them for the US models.

 

Matti,

.... And if ya look really hard, you could find some of my earliest posts----

And in another 10 yrs, we're gonna open the time capsule on YOUR first posts---- lol

 

But here's the thing... I already know everything. I was born that way.
Oh wait, no. In ten years, I'll still be a knucklehead, so the contrast won't be so shocking.

 

hehe

 

This post makes me happy....its good to see the now experts were once new as well