XJ750 SECA Custom

Posting this here to keep it documented somewhere else other than my phone. Also for any questions in the future. Thanks!

 

Have a lot more pics if anyone is interested. Will update as milestones are completed

 

FZ1 Rear caliper bracket and custom bushing

 

Impressive and extensive project. Would be very nice with a writeup!

 

Thank you very much! Been on this project on and off 2 years and just a few months ago finally got to a point in my life where im finally able to work on it regularly. Hoping progress will remain consistent as it has.

 

Yes, very creative engineering/solutions!

 

very interesting. what rear swing arm did you use for the swap.

A write up would be great and please include some of your findings. like the custom bushing and if there were issues with center aligning the rear wheel or did you kept the offset.

 

Swingarm looks like Virago 750/920, possibly XZ550.

 

Lower portion of the swingarm is off of a 82' XJ750 Maxim, Final drive for the upper shock hoop mount point is off 83 XV750. Upper portion of arm was from XV750 arm as well. Rear wheel is 95' XJ900s Diversion

 

I will see if I can find and link the freeCAD file of the bushing here. As for the offset, I plan to keep/ work around. Appears to be minimal

 

Could someone let me know if this file works? thanks

 

updated

 

Download worked for me. Zip file w/ 3 files in it. I don't have anything on this machine to open said files, but they're there (.stl, .step, .FCStd1). Wait, STD 1? Did I just give my computer a social disease?

 

Don’t worry. It will clear up on its own in a few weeks

 

Thanks for checking for me lol. New to this.

Tires got ordered on my lunch break. Continental Sport touring 120/70/17, 160/60/17. $184 shipped from JPCycles. Once tires are mounted to get correct ride height, I can begin tacking up the monoshock.

 

Universal rear sets have been ordered, last piece needed to finish the major frame modifications and finally have a roller again.

 

Very interested to see how this turns out and your work on the monoshock. The combination of different swingarm parts is pretty smart. I am curious how you are going to figure out the best angle for shock travel. it might be easy and straightforward, I have never done it so I am curious.

 

The variables needed to find that angle come from finding the Wheel rate, and spring rate.

 

Tires came in last night and my goodness nothing like some fresh meats! Got home late, was able to get the wheels off. Though they may have to wait till the weekend because I’ve been without my car for a few days, Clutch master Cylinder leaking. Why is it every time life is going well, your vehicle decides to speak up

 

I love the smell of new tires in the morning.

 

DIY rear sets from Dime City Cycles came in 2 days ago. No pictures yet though and sadly tires still have not been mounted. I have been trying to decide whether I want or will need to shorten the rear of the gas tank by maybe 2-3 inches? I feel it makes the bike long but I guess I will have to wait until I get the rearsets and tires mounted so I can sit and see how it feels sitting that far back.

 

I am by no means a master "know-all" bike builder, so any questions comments or concerns about my build I am more than willing to address!

 

Not the best picture and little progress but tank is finally tacked in sitting where I want it. Started on the seat portion and quickly realized it was time to stop and get some whiskey before I f*** something (else) up lol

 

A ton of work!

 

But more progress last night. Seat is a bit tight to fit over the seat frame so I’ll have to adjust that or decide if I want to have the seat frame covered. Tank is not level left to right because the tank mounts are tacked and flex for now. Tail of the seat still needs to come down lower to be level with the top of the tank but still happy seeing the seat with nothing propping it up. But look at those body lines running from the tank to the seat damn near perfect match. Hoping to get the tires mounted by tomorrow.

 

Really cool project.
Is that a 400 tank or Vision?

 

Thanks! means a lot as far as motivation goes. And you are correct Sir! XZ550! Suzuki TR750 seat from Airtech Streamlining

 

Seat angle is fixed and I believe final. Started on rear tank mounting. As it sits when you “rock” the tank on it has a nice tactile feel as it latches in place. Was thinking of dampening and putting a pin through but not sure how I feel about. Tires are finally at the shop to be mounted.

 

Progress has been slow due to not having my car. Priorities. But problem solved. Kinda hard to bleed a clutch with a snapped clutch fork. Clutch kit will be here Monday. Will be doing myself. Not enough time in the day lol

 

Nice work on the bike.

 

COULD NOT BE HAPPIER WITH THE WAY EVERYTHING IS LOOKING. Tires. Finally. Still need to push the front forks up through the clamps some more for the rake. Fitment of the tires is perfect. I do need the shims/washers for the swingarm before I can begin welding on that to be certain everything is squared up. Chacal? My frame stand just so happens to put my swingarm exactly where I want/need it to be, 12 Degrees. Also my rear sets from some city made it to the garage and off the dresser. Decided I don’t like the rear tank mount so will have to re visit that. Huge milestone for me but it’s still not a “roller” per say. I’ve also been sitting on intake and exhaust covers I modified from a cad file I pulled off here. Much appreciated. Color coded for fun. Tank cleaning and prep along with the engine should begin soon.

 

Numbers, 12* SA angle is without rear sag, that's in sport bike range. My bike is '82 XJ750 Maxim (aren't they all)
W/B 55.375"
Rake 25.3*
weight front- 49.3% = 201.14#
weight rear- 50.7% = 206.86#
Weights and percentages are from a friend's digital race car scales. I can't recall the S/A angle, I'll check domani.
Fun to compare to others specs.
Cheers, 50gary

 

Not sure when ill be able to get on a scale although id like to. I believe my wheelbase is very close to yours if not the same, I will have to find where I wrote it down, just measured it not too long ago. Much appreciated look forward to seeing the similarities.

 

So I’ll finally be driving my car home from work tonight. Working at a shop and only being able to work on your car after you get off and during lunch is frustrating. None the less it’s fixed. Progress has been slow but will be picking back up now that that’s out of the way. Small update on seat and I have decided I will be shortening the rear of the tank 2 inches.

 

93612-99168-00
Rear dowel pin for the shock im using. Any ideas for something interchangeable?