N/X gear ratios

Awesome forum!!
Did a search but couldn't answer my own question,
Would the 1985 XJ700 N and X models have the same gear ratios?
I ask for two reasons:
I took the bike for "my" first ride with her, rpm's seemed very high
for the mph, tach not working (today's project)
and the second reason I ask is she is an "N" but I have an "X" service manual.
I did a spin test on the final drive and came up with a wisker over 4:1
At just under 9000 miles I can't imagine the PO changed anything but
she has been down once.
Thanks
13al

 

Welcome to the forum. I believe the x and n models have the same tranny. Mike may be along here shortly to say the same, or different. I've owned and ridden both (4 n and 7 x's) and you will have high rpms due to a lack of 6th gear (what was Yamaha thinking?). Don't know how many times I've reached for 6th gear

 

Thanks mcrwt644!
I've read other posts about the rpm's but WOW!
Yeah I reached for another gear and it wasn't there
nothing more embarrassing than coming out of a shift
at the same rpm you went in.

 

Get the right service manual. There's WAY too many differences between the airhead's and the X's. Most parts are not compatible.

Also, Please tell me that you checked your rear brakes for delamination and your tire date codes?

1 more thing... please add your bike's info + your location in your profile/signature - makes it easier for us to help you!

 

Differences from the x to n are really not that many. They utilize virtually the same frame (with the exception of the routing of the wire loom under the neck on the n) the location of the coils, the engine-big difference-, the shocks, the forks, the carbs. Most everything else is interchangeable. I have a full airhead exhaust on my x. The cdis are different as well. There are a few cosmetic differences as well. One of which is the fact the n model only had one button on the front seat vs 4 on the x, and none on the rear seat and 2 on the x.

Wheels, frame, swingarm, seat, airbox, tins, handlebars, triples, calipers, master cylinder, kick/center stand all the same. Heck, you can even pull an x or n cdi and use it to test spark on the other.

 

jmilliken,
I concur, the correct service manual would be nice (the X came with the bike) for the specs, but if I had those I wouldn't have found my way here!

Dunlop tire dates front and rear "were" XX6
The bike prod date is 3/85 with a paper trail of 8365 miles
So, would the tires be from '86 or '96?
New Dun's on now

All systems checked including rear brakes

Profile updated (I think)

 

mcrwt644,
Even the wiring is identicle, with the only variation being the wet bikes
needing fan control and temp switch.

I spent a full day removing the baseball sized knot in the wiring harness
under the headlight using the X wiring diagram
The knot included but was not limited to:
scotch locs
duct tape
twisted bare wires protected with MASKING TAPE........po's c'mon!

 

oh, sounds fun! Getting that mess back in the bucket is a rite of passage!!

 

I'm 99% sure the transmission parts are all interchangeable.

The 500 rpm difference in redline is what makes the difference in the published top speed (137mph for the X and 129mph for the airhead)

you'll get used to the higher revs. Third gear will take you to almost 90 mph for fun passing 8)

They'll run 7500 rpm all day (until you run out of gas about 95 miles down the road)

 

Thanks Desinger_Mike (and all)
I'll do the math and see if it matches.

 

Placed an indicator mark on the dust shield and final drive housing, removed the spark plugs and rotated the engine by hand in 5th gear
using the TDC mark for crank refference, engine revolutions are 5.70
to 1 of the rear tire.
The X manual specs are
Primary 1.672
5th gear 0.812
Final 4.179
That works out to a total ratio of 5.673
So, if the N's and X's are supposed to have the same gearing it's right on!
Then the rest of the math (with actual tire measurement) would work
out to 52.965 mph @ 4000rpm
Now for the road test (fixed tach yesterday but that's another story)
I'll see how far off the speedo is a 4000rpm

 

The correct service manual cam be had pretty easily.... unless your looking for the real book..... be careful in ebay. I paid for a book.... got a cd. The haynes helps some
.. but the factory service is the key

 

according to some specs I dug up, it should be about.
Engine rpm @ 60 mph, top gear 4663
Maximum speed in gears @ engine redline
(1) 48 mph
(2) 69
(3) 91
(4) 112
(5) 129

 

Great info Desinger_Mike
Thanks!
Using 4663rpm and my measured tire size I got 61.744mph, right on !!