A new project, the abandoned xj650RJ

Re: A new project, the abandoned xj650...

I would assume that he is planning to add p*%s. (the server apparently deletes bad words like "pods") I personally prefer the stock airbox over p*%s but that's me.

LOL

Dave F

 

Re: A new project, the abandoned xj650...

I have to agree with these Guy.. its unloved but very sexy flat black hell not so sure... take ur time like big Fitz told me and I'm sure you have seen get a book read it remember it then read again this site will help you a lot and i dont care what the bike needs.. as long there a title and a frame you got a ride... xj bike parts off this site are cheap good an the parts man knows his stuff..

 

Re: A new project, the abandoned xj650...

Thanks swe-eet I sure am getting myself familiar with this bike and looking at reference manuals as well as tons of pictures here and videos on youtube.

Something that I am having a hard time to find is original pictures of my bike, what did it look like in the show room. There are tons of pictures of people adding or getting rid of parts but I would like to see pictures (especially details) of what the bike looked like when it came out of the assembly line. It is hard to figure out what the original looked like since this is such an old model and previous owners have done all sorts of stuff to this bikes.

 

Re: A new project, the abandoned xj650...

Just do a Google "Image" search on "82 Yamaha 650 Seca."

The silver bikes with the blue/white stripes are stock 650 Secas.

My bike (original but far from pretty) is one that shows up, too.

UNRESTORED (a "before" pic

 

Re: A new project, the abandoned xj650...

That's in better condition than the one I just picked up.

Dave F

 

Re: A new project, the abandoned xj650...

Thanks big fits, I have done searches on google but can't figure out what is "stock" and what is modified since it is hard to know what to reference to.

Thanks a lot for your photo, for example I thought I was looking at a gauges cluster for a 1982 xj650RJ to find out that a picture that I was looking at it was from an 1981 550 Seca. They differ a little but I want to figure out what stock was.

Your bike looks pretty good to begin with. I can't find the emblems "650 Seca" anywhere... that is gonna take a while.

 

Re: A new project, the abandoned xj650...

Check with XJ4Ever on the sidecover badges. If he can't help. send me a PM.

 

Re: A new project, the abandoned xj650...

Ok, so I got my feeler gauges and here are the numbers I have so far by piston and valve clearance.


OUT - 0.06 - 0.05 - 0.06 - 0.06

C4 - 150 psi C3 - 165 psi C2 - 130 psi C1 - 130 psi

IN - 0.16 - 0.00 - 0.06 - 0.06


It seems like most of them are tight but for the most part very similar numbers.

I will be replacing valves soon and get the valve clearance up to specs. This is exciting, finally make some progress on the right direction. I have been reading about carbs a lot and it seems like there are lots of little parts in there so that will take a lot of cleaning and replacing seals, o-rings and such. In the meantime I am keeping my eyes open for missing OEM parts for this bike.

 

Re: A new project, the abandoned xj650...

Carbs are a pain however they ain't as hard as they seem take pics use a cupcake pan or something and keep organized. ... I think rick and Fitz both have good Carb write ups and your book for repair like hyanes as a lot of help there to..biggest thing I learned on carbs is one at a time and take as long as u need. The better you do the better shell. Run

 

Re: A new project, the abandoned xj650...

Hopefully you meant "valve shims."

For future reference and to make it easier for everyone trying to help; the cylinders are "numbered" 1-4 from left to right as you sit on the bike. So when any of us refers to the #1 cylinder, we're referring to the left-most one.

Sounds like you're on the right track.

 

Re: A new project, the abandoned xj650...

Correct and correct, I meant valve shims. And yes, I was watching a video on youtube and the guy numbered the cylinders one way and I went with that, once i open the cover I saw the cylinder numbers stamped, good observation.

 

Re: A new project, the abandoned xj650...

 

Re: A new project, the abandoned xj650...

be careful with those YouTube videos; there are quite a few "mis-instructions" running around, as you've discovered.

 

Re: A new project, the abandoned xj650...

I am learning that (so far not the hard way), I'll be ordering new shims tonight to get this up to speed.

Once I started putting the data on excel I was curious if it would be helpful for other members of this forum to have a spreadsheet and enter all formulas for shim gaps to the spreadsheet will spit out what size shims are needed any adjustment is required.

Bigfitz, I have one valve gap at 0.16 and the specs call for 0.11 to 0.15 and they seem to get tight overtime. Should I even bother to get the new shim or 0.01 is already to far on the range or "normal"?

 

Re: A new project, the abandoned xj650...

Normally my response would be "in spec is in spec and out is out."

However, in the case of this particular motor and the circumstances you're in, I wouldn't re-shim tighter for .01mm. I'd leave intake #1 and see where it's at after you've put a few hundred miles on the bike.

The super-tight ones are the concern. Glad you checked? #2 intake is.

One other note: because of the way this bike sat, etc., plus your findings, I think it's safe to assume the valves were ignored. So consider this the "3000 mile check." But DON'T wait 5000 more miles for the next one, like you could on a new motor. Once the bike is up and running, I'd re-check after 2K ~ 2500 miles. Then start your 5K intervals.

 

Re: A new project, the abandoned xj650...

Will do Master Shifu

 

Re: A new project, the abandoned xj650...

Eco---

I'm in the middle of doing a complete carb rebuild/resto on my 650rj right now. The rack is TOTALLY torn down.....not a single piece connected to any other piece. If you need a picture or measurement for carb stuff, let me know and I'll take a shot of it for you.

I'll get the shim pool out this evening when I get home and check on the ones you asked about.

dave Fox

 

Re: A new project, the abandoned xj650...

A lot of times the primary chain guide falls apart. And a piece will get lodge in the gears, and you can't shift in to second. The gears are very robust so I doubt that second gear is broke just jammed. (ask me how I know) But you are on the right track so I don't suggest tearing the in bike engine apart. Just keep it and it will be a good project for the future.

 

Re: A new project, the abandoned xj650...

razz, I think you may have intended the above response for a different thread?

Eco, add an "R" to the 650 in your thread title... "abandoned xj650R" it is a Seca after all.

 

Re: A new project, the abandoned xj650...

Fitz, The in bike engine does not have 2nd gear or wont go in to 2nd gear. It could have a chunk of chain guide jammed in the gear selector forks. Causing it not to go into 2nd gear.