what kind of xj is this?

its got a replacement vin so i cant tell.

i think its an 82 maxim.
but 650 or 750?
and the motor has a stamp on it that makes me think it might be a 750. its my first bike. i picked it up for 500 bucks. the bike starts but only fires on 3 cylinders. i put in new plugs and have begun to rebuild the carbs. (ive never messed with an engibe before but so far, so good) they were really dirty. i have started to paint and polish as i wait for parts to arrive. the tank is in the driveway waiting for the bondo to cure. nothing like rough sanding at midnight.






oh and thanks for having such a badass forum.

 

Welcome, that will be a great project.
The red line on the rear brake hub has given me an idea. Thanks Wiz.

 

Any pics of the tank?

 

2500 cm3 = 2.5 litre. what's that all about?

 

could it be fluid (oil) capacity?

 

check right rear of engine and steering head pipe for a number , should be 3 digits-6digits, get the 3 digits and then look them up here:
http://www.merrittmotorcyclesalvage.com ... lcodes.htm
lists lots (missing my bike though) but may help.

A.B.Ames

edited: actually can see the #'s but not read them in your last photo, flat area just above where you took the pick of the 2500cm3 stamp

 

whoa crap. 5g2-002225. looks like its a 750 and not a 650. 8O ok. thats a ton of info. no wonder my friend said the bike felt really quick.. GUess i picked a big one for a first bike... hehehehe cool!

 

Yes.

 

The shocks,headlight,and rear grab bar are from an XJ 750 Maxim. The body sidecovers,muffler hangers,mufflers,and footpeg setup tell me that the frame is that of a 650 Maxim.

 

Looks like a 650 to me, 650 seat, 650 side cover. 650 speedo Correct for 82. (83 570 uses same speedo though) Would not be 81 since has YICS covers on engine. So my bet is a 650.
Would be cool if it had a 750 engine on 650 frame. Not sure if it would fit but it would be a fun ride with the smaller lighter frame

 

Single front brake = 650
Now let's look at the motor between the pipes #2 and #3 and see if it says "649 CC " cast in the aluminum, or "749 CC", or maybe 748?
it's pretty small, but it should be there,
or if your carbs are opened up, are your main jets "110" or "120"
That's a dead give-away for engine size.

We could also measure your cam lift. . .

Check your compression on your "dead" cylinder.

 

Re:

Its a FRANKENSTIEN bike. 8O

 

Hi,
I found another site that says 5G2 was used for both 650 ('81) & 750 (81-82's) seca's (guess motor's from another).
http://www.dropbears.com/m/models/yamaha/xj67info.htm
So TIMEtoRIDE's advice is best..sorry bout that.
A.B.Ames

 

the engine is a 750. it has the stamp that says 748 on it between #2and#3. thanks to timetoride for that one. I guess thats like 15% for free or something.

The seat doesnt fit quite right. i think its off of a different year frame. the front fits fine but the back latch doesnt have anything to grab on to.

FWIW the headlamp and handlebars are aftermarket. I think the headlamp is some sort of off road enclosure that just happens to fit. Ill post pics of the tank tonight. i just filled in the badge holders with bondo for a smooth look. Ill shoot primer tonight.

 

Do the 650's and 750's both have the same oil capacity??
My 750 SECA has the same 2500cm3.

 

ouch miss post not sure how to delete it?

 

Not from what i found,
My bike (84 XJ750), according to specs is 2.5L oil change and 2.8l with filter replacement (and it's stamped same as yours on case).
650's Info I found say some are 2.65L and some 2.35L (without filter changed) depending on version (i.e 650RJ = 2.65L etc.)

 

my bike is a 650 & the stamp is 2200cm3.
engine / transmission oil quants-oil change only.
xj650-11n (uk) & xj650RJ =2.65 litre, all other xj650 models = 2.35 litre.
all xj750 models = 2.5 ltre.

 

That is because it has the wrong grabrail .The 650 Maxim has a lock mounted on the middle right side of the grab rail. I'll discuss in more detail,check your PM.

 

Interesting, my 83' 650 seems to have an 84' 650 motor 5N9-XXXXXX and has 2500 cm3

 

what does that 2500cm3 or 2200cm3 mean, I don't think its oil.

 

5N9 isn't listed in the manual that i got the specs from, closest is only 5N8 ('82 650J).
Maybe in 83/84 (for the motor) they used a 650 top end and 750 lower.
Clearing out old stock and mix and match, like my 750(RL) in a 900 frame.
As for Wizards 2200cm3 stamp thats seems odd compared to specs, but i just stafrting to learn about these bikes, and haven't see any other in person other than my bike.

 

5N9 is the frame code and model number for a 1982-84 XJ650 Maxim, Canadian model.

With the last 6-digits of the vin (xxxxxx) we can determine which year it actually is.

Also, the 650 Maxim grab bars are one piece, not a 3-piece design like on the XJ750 Maxim models.

 

do you know if a grab rail from a 750 would fit? i wonder if they are the same width? i have 750 rails i think but im missing the rear third of it.

 

I have a very nice 650 Seat Rail and Grab Bar.
One piece.
Die-cut lettering at the back "YAMAHA"

$35.00 Buck plus the shipping

 

Why would you want to buy another 750 grabrail,as you already know that it isn't the proper part? Yes,you are missing the rubber covered loop that connects the two sides of your grab rail,but even if it were present,it would do nothing to solve your seat locking dilemma.I am not trying to insult you,just trying to help you find the most sensible and cost effective solution to your problem.And I am still jealous that you have a 7.5 in a 6.5 frame!

 

danno,

i dont really understand what the proper fix is to my seat problem. Im assuming that you were going to send me a pm pertaining to this based on your previous message. however, i didnt get one so i dont understand what the safest way to resolve my seat issue is.

and im glad your jealous. :lol: :

truth be told, ive never ridden a motorcycle. not even this one. Tomorrow i begin my motorcycle safety certification course. im a little freaked out by how powerful this bike has the potential to be. I guess its good to have some headroom.

right now im just waiting on new carb hardware to show up. i got the tank smoothed and primed and im just waiting for it to harden to smooth sand and shoot the final coats.

Im really excited to have scored this bike. the following here in this forum is great. I dig this bike because its totally different. and now that its a frankenbike i dig it even more.

thanks for all your help.

now to hijack my own thread,

any idea why my transmission would shift backwards? it goes one up 5 down instead of 1 down five up.

my friend got it up to third while when he was test driving it. and said that it shifted fine but it did it backwards. the seller told me about this. it sounds like something is flipped over, zigged instead of zagged. right?

 

Hey,TJ,not the first time a pm hasn't gone through! A grabrail from any 650 Maxim (with a seat lock assembly and key) will rectify your situation. I have all available for $25 plus shipping. (sorry Rick,this was my initial offer,even if my pm didn't go through.).Don't pm me,rather contact me at rukittenme@yahoo.com,if interested. Sorry for the confusion.


Dan

 

Hey again,turtlejoint.If memory serves correctly,the 750 Maxim shift shaft is in a different location than the 650 Maxim shift shaft (probably to accomodate the 750's adjustable footpeg assembly).The difference in location is slight,and my best guess would be that you are shifting from the other side of the shaft (not that there's any thing wrong with that...)
If it bothers you,I am quite sure that you could that you could swap your trans cover and shift shaft (a very simple procedure,although I would recommend a new cover gasket and shaft seal,as long as you are in there).If you want to swap yo stuff for me stuff,I can bring you back to the original shift pattern. I kind of like the 1-up,4-down shift pattern as a theft deterrent (As if I need need one ,as much of a beotch as my bike is to start !).

 

I think you'd really need the entire internal shifter mechanism, too, as the shaft assembly inside the cover exits the cover in a different loccation (due to that adjustable shifter that Danno mentioned, as the the 650 frame doesn't have the mounting bosses for the adjustable assembly, so they probably used a staright 650 shifter pedal on a 750 engine, and that will give you a reversed "pattern"). It's not as quite as simple as merely substituting the COVER, as the shifter shaft and lever assembly are different also, and perhaps some of the other internal components.

Some additional advice on what other issues you might run into might be needed,