How fast have you gone on your XJ?

With having an '81 Seca 750 before and now with an '83 Seca 750, I'm also in the 85+ category!

 

Exactly 0 mph lol. I just got my 85 XJ700 and am still getting it road ready. As soon as I get a chance to make sure everything is good mechanically I will re-post with some numbers. I can't wait to see what it will do.

 

I hit just over 115 on my old bike, an 86 Honda Interceptor 500. It took a little bit to get there. I'm pretty sure I won't try to go that fast again. I couldn't get the courage to go over 100 on a friends R1. The fastest on the Maxim is about 75.

 

220 km/hr and still pulling, i had to stop looking at the speedo to concentrate on the road. at a guess i would say i was doing 235/240 ks. this was on my 85 xj 900 laying on the tank with my feet on the pillion pegs. the bike seemed to do it without fuss and was rock steady all the way. its all still fresh in my mind as it was only 3 days ago.

 

My 80mph+ shimmy went away when I installed a wind screen, so...
My speedo pegs at 85mph. 5krpm in 5th is 65mph. 6krpm in 5th is 78mph=/-. the speedo pegs at almost exactly 7krpm in 5th. I had it riding smooth and solid at 8.5krpm today. Anyone want to hazzard a guess at the speed? I'm thinking somewhere between 97 and 102mph???

 

170km/h (105mph) to the speedometer, not sure how fast it really was. Done by 5th gear, couldn't go any faster with 6th :?

 

Back when my Seca was new I did about 125 MPH on highway 70/82 between Las Cruces and Alamogordo in New Mexico. We were coming down the mountain and the road was nice and smooth. My buddy was on a Yamaha XS Eleven and his speedometer went a tad higher than mine. I hit a nice big dip in the road at 125, became airborne, and the Seca did a shimmy when I hit the pavement again. I immediately shut her down to clean out my shorts. 8O I've since gone much faster on other bikes, but 125 for the Seca was pretty fast.

 

i have k&n pod air filters, cut the rear baffles out of the exhaust, brand new intake ports, new wheel bearings, Castrol GTX 20w50, vacuum conect mod on the intake ports, and a blue mohawk on the helmet. other than that the engine was rebuilt and bored over by its last owner. it was on a pretty flat spot and there was no wind, being bored over and having the in and out flow and new bearings probably add up little by little

 

Ah, the bikes pretty much been built.
Pods, exhaust, which means jets.
Bored over, ported and polished, which means rings possibly pistons, nice.
It should scream.

I have the stock speedo 5th gear, 7K is 85.
It might break a hundred. 8O
Nice to know what it could do.

 

7000 at 85 is where my 650 is when you get to 8500 youll be at roughly 115
the real power band on these bikes is between 7000 and 9000

 

Sweet! good to know, I didn't figure you'd get another 30mph in 1500rpm.
Also good to know that my ride is where it should be compared to other 650's.
So the factory spec of 120mph is attainable.
:twisted:

 

I really dont know how fast. My bike only shows 85mph, but I can burry the needle to the 6 o'clock position. It is hittin about 8100rpms, needle burried.

 

Many years ago, I had my XJ750 at 11,000 rpm, I'm guessing that was pretty close to 130, YIKES!! Don't think I'll do that again.

 

on my XJ I've only done about 50, but that's cuz I'm still working out some kinks, lol...

But on a ZX-12R I've done just a tick under 170, if my conversion is right. The friend that lent me his Ninja bought it in Canada, and I was doing about 270 km/h. Of course, that was after I brought the bike back from my first tour with it. He asked how fast I'd gone and I sheepishly shrugged and said "oh, about 100". He told me I'd never ride it again if I didn't show some moxie.

Of course, later I learned through reading that doing 170 pretty much ensured that if ANYTHING had gone wrong on that ride I would have had just enough time to blink out a morse code prayer for absolution before I would be nothing more than a bloodstained smear on the asphalt, but hey, here's to being 19 years old again right?

 

My math says 168.075.

Took the X into work today; first "long range" cruise I've done on it. Bopping along on the freeway at 65, and was looking to get over into the far right lane for an upcoming exit. Cars kept hopping into that lane, too close for my taste, to allow me to move over. When the third one followed suit, I said "the hell with THIS..." and cracked open the throttle. Jumped into the lane and put a bit of distance between myself and the car behind me.

Bike was handling fine. Wasn't even breathing hard. Looked down at the speedo and discovered I was doing a stately 95... 8O

 

zx12 should do more, my zx9 does 280 km/h
zx12 should do a bit over 300 :twisted:
I'm curious what the new Zx14 will do

 

i just converted mine for you guys who work in mph, 230kph = 143mph

 

Completely agree Hyperion, if I recall right the ZX-12 would do a bit over 200, but then he only said to show a 'little" moxie. lol... like I said, prolly would never even think about trying that again, but that was 19 w/o kids... whole lot different mindset back then.

 

I was on a ride last sunday with a local group. We where tearing up the freeway and came to a wide long bend going up hill and looked down midway through the turn and noticed I was at 100mph with plenty of 5th gear left.

I'm more afraid of the ticket than I am of the bike not being able to do it.

 

I WAS CLOCKED AT 96MPH BY THE POLICE HERE IN THE UK..IT WAS ONLY 46MPH OVER THE SPEED LIMIT ..DUNNO WHAT ALL THE FUSS WAS ABOUT..OH WELL MORE POINTS ON MY LICENSE

 

OH THAT WAS ON MY MAXIM 550 BTW

 

I hit 125 mph on a section of Route 1 outside of langhorne, PA on my 81 XJ 750 RH Seca. My speedo stops at 85 but a friend was alongside me on his 2000 Honda Nighthawk 750 with speedo going up to 140. My bike is pretty much stock except for Supertrapp 4 into 1 header and muffler.

 

I have had my 1982 XJ750RJ Seca with the factory sport fairing ,hard bags & trunk up to 121 mph... and it is all stock. I had a relative following me on a Honda ST1300 that's how I found out how fast it will go. These bikes are still great runners.

 

Last week the LEO said was going 75mph my speedo said 60mph. Wondered why I was passing everyone. Can you belive it he gave me a warning.

 

Both my XJ550's have 85MPH speedometers so I have no foggy idea but I have had one to redline in 6th which is about 108 maybe?

 

My 750 Maxim is Canadian, so it has the 200 (or more) km/h speedo. I took it out for my last ride on it Thursday night (plate is going on my new bike) and it wound up to 160 km/h (100 mph), and still had more to give. I did not as (a) the street-racing laws here lead to roadside seizure of your vehicle and automatic license suspension (so I was only at that speed for about 30 seconds). (b) it was getting dark and deer tend to be out and about.

I have to hand it to these bikes : they like to run hard.

 

I swaped my spedo off of an xs 1100 and I have had mine up to 155mph, dont know what the tach was doing since it hasent worked since i got the \bike. the gears are the same for the 1100 as the xj i was suprised to find out.

 

it is my understanding (someone correct me please if wrong) that all Japanese bikes regardless of manufacturer equipped with mechanical front-wheel speedo drive are ALL geared the same, 2400rpm=60mph. So theoretically any Jap speedo you can get to PHYSICALLY fit should work?

 

My first Maxum, 1986 xj700x I was clock by a police buddy of mine at 121 because I wanted to know if it would go over the 120 mark. I would not recommend this to anyone. I was MUCH younger and MUCH dumber. I now try and limit myself to much more reasonable speed. I hope this new bike will at least go in the low triple digets when I get it running.

Keep smiling,
It gives the bugs somthing to hit.

 

My 750 maxim was clocked at 125+ when the previous owner had it years ago. But he was almost 100 pounds lighter than me, back then. Since then he has gained all that weight and I own the bike. I'm hoping it will still run like that again. We'll see very soon!

 

Last night my seca inched past 130, at least based on the speedo in the chase car, 1998 camaro (which who knows if its even remotely accurate honestly, car has 180k miles on it and has never had anything other than oil, tires, and gas). My friend was driving the camaro and flashing strange hand-signs at me trying to tell me how fast I was going, once we broke the ton, the bike just walked away from the car. I shut it down when the bike developed a slight shake (not sure if it was the road or something bad) and he told me when we got home he was at 130 when he saw me close it up and i was still pulling away.

Like I said, no idea if I was really doing 130, but it felt like it. Scary!

 

0

the "naked asian" its in parts on the floor

 

near 150km/h

 

115 mph

Smooth as silk, but still scarey 8O

 

i had a bit of a scare on the 900 this week, i was showing off by doing 180k in 3rd gear, overtaking a few mates when i hit a lump in the road, the bike jumped about a foot to the right (without me) then landed very sharply. i can tell where it happened as im sure the contents of my bowells are still there, and now i have a bill to rebuild the adjustable konis i had on the back. at least i have the father in laws xj 650 to ride till mine is better again. but boy that is a come down in the power range..

 

110 according to my brother inlaw's bike. It never ceases to amaze me what happens at 7 grand on this bike...maybe its a good thing its a 650 and not an 1100....

 

dont wanna sound repetitive but yeah pegged at 85 but still accelerating.. race my girlfriends brother 81 honda 750 form a 50mph roll..absolutley smoked him. hehe love the xj to death

 

around 110-120
dumb i know but i wanted to see house fast i could get it
and i had a friend follow me so i know it was over a buck 10
but ive not gone that fast since

 

105. My father has a radar gun from his police scum days(running traffic). He hated every minute of it and left the force as a narcotics officer.

At any rate, I did not try to go faster as the stretch we were on does not have a long way before a tight turn and to be honest, at 6500-7000 if that happens a lot more is possible....

 

Dunno. Both have Reaganometers so over 85 I have no bloody idea. I'll let you know after I get the 120mph speedo installed.

 

135.... front end started wobbling.. uhm yup, lots of nice flat roads up here

 

80 mph. fast enough for me . rarely do I ever go beyond the speed limit. I keep away from the stop and go traffic by riding the backroads . this makes for a better ride in my eyes because i can enjoy the cruise which is what its all about.

Just a note:

Don't overdrive your headlights @ night.

great to know no matter what you are driving.

Be safe

 

115 on my '82 seca. Man was that fun!

 

pegged the speedo on a few occasions, that 85 mph speedo needs swapped.

 

I will be putting together a photo documentation of my speedo swap. LOOKS LIKE (can't say for certain-sure until it's done) that Yammie speedos of the same era shared the same (or very similar) guts. I got a 120mph speedo from a '79 XS off eBay and gutted it, innards look to be a straight bolt-in replacement for the Reaganometer. Stay tuned.

 

Just messing around the other day on an open clear road.Decided to twist the throttle and hunker down.Hit 105 at 8 grand and was still pulling.Redlines a 9.5.Specs say top is 127 and im sure it would do that!

1985 xj700n

 

.

A little history lesson:
When the Suzuki Hayabusa debuted, it was a 180mph rocket. Kawasaki's ZX11 was no match for it and the Hayabusa was closing in on being the first production bike to eclipse 200 mph. Kawasaki's answer was to be the ZX12, but in the same year of the 12's debut, the European Union threatened to ban them both. Bowing to pressure from Europe and elsewhere, Suzuki and Kawasaki agreed to a self-imposed limit of 300 kph (186 mph), so both the Hayabusa and the brand new ZX12 were hamstrung at the factory to a max of 186 mph.
The newer ZX14 is still subject to the same limiter.
So unless one of these three have been uncorked in the aftermarket, nobody is going 200mph on ANY of them.

And in linderman's defense, he was merely saying how fast HE had gone on a ZX-12R. He was making no claim about it's top speed potential.
270 kph translates to 167.7 mph, so his conversion is about right.

And a ZX-9R running at 280 kph => 174 mph must be a VERY healthy specimen, indeed. I had a ZX9R that would top out at just under 160mph (GPS-verified). I suspect Hyperion's speedo is a tad optimistic. That extra 14-15 mph takes a LOT more horsepower to attain. Not saying it's impossible, just curious...

 

My understanding is that most motorcycle speedos are inaccurate on the "optomistic" side above 100kph or so, mainly to keep riders safer. Your assumption fits well with that theory.

That seems to be true of MECHANICAL speedos, anyway. Not sure it today's electronic speedos are any more accurate. I was never clear on whether the sources of the inaccuracy was in the speedo itself, the pickup (speedo gears) or in the cabling in between.

...or perhaps in the overall design. The whole thing is based on the number of rotations of a front wheel that is a fixed size. But one can put slightly over- or undersized tires on a bike (90% aspect instead of 80%, for example), and TIRES WEAR. Down at the lower speeds, that probably doesn't affect the reading much, but at higher speeds when you're counting dozens of rotations per second, that error might become significant.

I don't suppose anyone knows where there's a good analysis of this?

 

RHYS,
Exactly.
Let me help you down the path of truth with a question. On what, is the revolutions per minute of your tire based upon?
hint: It involves the circumference of your tires.

Another question: What do you think happens to the circumference of your tires as you go faster and faster? Does it stay static? Is a mechanical speedometer capable of factoring for increased tire circumference?

And can a bike manufacturer control tire tolerances from lot to lot, or whether an owner buys a non-stock tire with a different profile and overall circumference?

Since i've owned a GPS, i've never ridden a motorcycle that had an accurate speedo. And the error gets worse at higher speeds, based at least partially on the thought experiment i outlined above.

At 30mph around town, most bike speedos are pretty accurate, within reason.

10 % "optimism" above 100mph is pretty much status quo. Always has been.

GPS and Radar don't depend on tire cicumference and counting revolutions of same per time unit for their measurement. That's why we believe these two devices, over a speedo.

 

The fastest I have went on my Xj650 is 119mph. When I was 16 I had a Xj1100 that I put together out of a box of parts. I had it up to 134mph one time. I quickly doubted my assembly of the bike and backed way off.

I have gone 90mph on minichopper powered by a supercharged honda 5.5. That was scary.

I had my dads Honda Vtx 1800 up to 150mph once, that big vtwin was screaming.

Before I sold my Ninja zx11 I was clocked by local police doing 173mph. I topped it out one time and got 194 mph.

All these speeds are from my gps, not the bike speedometer. Other than the one speed that was courtesy of the uniformed guy with his radar gun. As you can imagine I had a LOT of explaining to do.