Well it's more of a nice trick

[ShakerNorm]

You got that right, Leo....

[plattey]

Some of the guys at work are volunteer firefighters and they received a call today to report to a motorcycle accident. The guy was on a road with a 90 degree turn with a bunch of pine trees along the side of the road. They told me that they had to cut some of the trees down to get to him with appropriate equipment and get him to the hospital in Dodgeville. After Dodgeville, they flew him to the hospital in Madison. After hearing stories like this and the one you told xsleo, I keep reminding myself to be a cautious rider.

[czechbiker]

Wound my 1978 E up to 85mph. I'm running a header and rejetted stock carbs. I have a windshield and shut it down because I thought the thing would break right off the handlebars. I need to get up the balls to take the windshield off and really open her up. I would hate to blow this original engine. So I rarely do it.

[scabber]

I've have had my 80XG at 7500 rpm 5th gear 17 and 32 sprockets more than one occasion. how fast is that. I haven't been able to open the gear spread sheet. 140 mph in my corvette ;D

[jetmechmarty]

When I was young and less experienced, I opened up my new XS650 and let it go as fast as it as it would. Even with my chin down on the clocks, it ran out torque before the redline. IIRC, the calculations from the tach and the speedo on the Harley running directly behind me said my top speed was approximately 112 mph. I thought that was impressive. I won't be trying it again.

[xsleo]

Scabber. I have been thinking a bout your speed. At 7500 rmp at the engine divided by the primary ratio of 2.666 = 2813.2 rpm at the input to the tranny.
Tranny input Divided by 5th gear ratio = 2942.6 rmp at front sprocket.
Front sprocket rpm divided by sprocket ratio, 17/32 is 1.88 = 1562.2 wheel rmp.
A 130/90-16 inch tire has about a 79 inch circumference. So 802 revolutions of the tire + 1 mile.
1562.2 divided by 802 = 1.95 This 1.95 is the distance in miles traveled in one minute. So 1.95 x 60 minutes = 117 mhp. So 7500 rpm in 5th gear = 117 mhp.
If you had Mike's 5th gear , .916 instead of the stock .956, it would figure out to be 120 mhp.
I don't know if this calculation is exactly right, I think it's pretty close.

[pamcopete]

XSLeo,

It's all here:

www.amckayltd.com/xs650revs.xls

[scabber]

Thanks Leo I figured it was going pretty fast. That 750 of yours ought to go into the twilight zone with the 17 and 30 your running. pamco I still can't open your link with my browser.

[kopcicle]

A friend sends this to me and marks it Rice 74 San Jose (Rice is #24 behind the lead group with the left side of his bike on the ground about to ...) . He swears I'm somewhere behind the crash about to get collected by the fence ...
We would exit the turn going fast and back it into the next going faster .
A mile track with a deep entry groove would see maybe 125 on a straight .
The XS was more nimble an less sensitive to washboard corner entries .
The XR's would just kill us off the corner unless our setup was perfect .
We could occasionally pull them on the straight but scrambling for traction was always an issue with the parallel twin . I've been asked before so I'll repeat it again . The 277/83 , 180 and even a twingle (both fired at the same time for short tracks) were all tried . The end result for the XS was the center crank pin . Anything over say 65hp and reliability suffered .Anything near 80hp and the clock was ticking from start up . Shell himself experimented with setups nearing 87 (which he will admit to) and a rumored 92 (which he won't ) and they didn't last long . Once all else is bullet proofed we were left with a weak crank center pin .
I've broken a ton on several street XS's . The stock frame suspension and geometry doesn't lend itself to much to high speed stability . Slightly steeper head from offset bearings , 35mm Cerianni front , Koni rear , bearings rather than bushings in the pivot and real rubber make a world of difference . I still have that setup and would feel comfortable up to 125 and beyond .
It's more fun to use the high comp alcoholic geared to 70 max and scare dogs, cats, kids .and little old ladies while leaving darkies where ever I go ...

~kop

[xsleo]

Pete, I can't open that either. When I try I get a window asking for a number about three miles long.
I googled motorcycle speed calculator and found some that you just go into My calculation was .4 mhp different than the calculator said.

[garbln]

I did 100+ on my original 77 XS650D in about 1980. I don't remember exactly how much over it was. I was pretty much flat out. Then I got to thinking about the Deer in the area, then even worse, how about a skunk wandering out on the road? I quickly backed off and drove home. Oh, it was about 1 AM on a very dark night and there may have been a little alcohol involved. I never did that again sober or otherwise. I have had my current 77D up to about 90 for a short burst and it is very smooth and stable crusing at 80.

[xsleo]

I haven't had the urge to run the 750 just as fast as it wants too. It does top out the 85 mph speedo I have right quick. And thats nowhere near redline. I have it wrote down what the calculater had it at. Some where around 125mph or so.
I don't think my suspension is up to it. It still has the shocks off the 82 on the rear, so things get a bit loose at 90 mph. So I try to keep it slower, hate to fall down now that it's doing as well as it is.

[mikebritton]

Made 122 on a seriously warmed over Triumph back in the '70's.
I was afraid to shut off, I was afraid of loading the front end and causing a tank slapper.
Since then, on the street, it's 60 or so tops. Made me feel old very fast. Mike

[mikebritton]

Oct 12, 2010 20:17:13 GMT -5 kopcicle said:

A friend sends this to me and marks it Rice 74 San Jose (Rice is #24 behind the lead group with the left side of his bike on the ground about to ...) . He swears I'm somewhere behind the crash about to get collected by the fence ...
We would exit the turn going fast and back it into the next going faster .
A mile track with a deep entry groove would see maybe 125 on a straight .
The XS was more nimble an less sensitive to washboard corner entries .
The XR's would just kill us off the corner unless our setup was perfect .
We could occasionally pull them on the straight but scrambling for traction was always an issue with the parallel twin . I've been asked before so I'll repeat it again . The 277/83 , 180 and even a twingle (both fired at the same time for short tracks) were all tried . The end result for the XS was the center crank pin . Anything over say 65hp and reliability suffered .Anything near 80hp and the clock was ticking from start up . Shell himself experimented with setups nearing 87 (which he will admit to) and a rumored 92 (which he won't ) and they didn't last long . Once all else is bullet proofed we were left with a weak crank center pin .
I've broken a ton on several street XS's . The stock frame suspension and geometry doesn't lend itself to much to high speed stability . Slightly steeper head from offset bearings , 35mm Cerianni front , Koni rear , bearings rather than bushings in the pivot and real rubber make a world of difference . I still have that setup and would feel comfortable up to 125 and beyond .
It's more fun to use the high comp alcoholic geared to 70 max and scare dogs, cats, kids .and little old ladies while leaving darkies where ever I go ...

~kop

This is how I managed 122. Trackmaster 750 TT120R heavily breathed on, Mile gearing. As sweet as the Trackmaster is, even with many offers since, I've never swung a leg over it after that! Miike

[cooch58]

Here in OZ the speed limit is 110 kph on some highways but mostly its 100kph on the open road (60mph) Up untill about 1980 there was NO speed limit on the open road. (notice the road rules are to acommodate the worst drivers) I have a 1983 Honda VT500 in standard trim and it will do 180kph though I don't think mutch is touching the ground at that speed.

Cooch