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  #21  
Old 6th December 2019
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well, this machine was not clocked with a gated run. on the flats, who knows but on the street, running with other machines with speedo's nearly in syn, it would run with machines many times it size in displacement.
the fastest i even been on a two stroke was a yamaha 305 @ 135mph.
we use to have this place that was out in the woods and straight as an arrow and about 5 miles long where we would run.
i think the bonneville run was around 116mph if that is the one you are referring to.
not off the floor models

most speedo's are designed to read faster than actual and the mechanical drives of yester year could be up to 20% off. the reason is that brothers in charge factor in owner mods like tire changes and such, been there done that. the electronic are much more accurate and mandated to be within +/- 5 mph. the one on my sport reads right on with radar and gps. will it do the 120 on the clock, sure with gears to go.
there are a lot of shade tree machines that out perform so called professional one, matter of fact, many copy what shade trees designed. it is nice to be able to go to the store and buy a cam, years past, you had to get one made or regrind one if possible. two cycles of past had many options being piston port or rotary valve.
what was nice about yester year is that rice parts could inter-change between classes, aka, the ole 50/90. there were ways to cheat on the track, till they started checking displacement, aka the cowpie A1 & A7 swaps.

Last edited by bustert; 6th December 2019 at 15:01..
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  #22  
Old 6th December 2019
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Quote:
Originally Posted by 45Brit View Post
FWIW, from my experience I don’t believe that ANY showroom-condition, street worthy 1960s or early 1970s, US or British made bike, of 1000cc or less, would manage a genuine 110mph, under any conditions at all.

The 90mph, 100mph, 110mph and 120mph figures use as model denominators by Triumph were all track-test figures.
cop speedgun had my '71 norton commando 750 @ 215k. bout 129mph.
bike 15 yo, mostly stock, w/k&n, bigger jets, dunstall muffs.
i didnt believe it either. cop showed me gun.
back when speedin was cheap. $35.
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  #23  
Old 6th December 2019
Iron Mike Iron Mike is offline
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Quote:
Originally Posted by 45Brit View Post
FWIW, from my experience I don’t believe that ANY showroom-condition, street worthy 1960s or early 1970s, US or British made bike, of 1000cc or less, would manage a genuine 110mph, under any conditions at all.

The 90mph, 100mph, 110mph and 120mph figures use as model denominators by Triumph were all track-test figures.
+1 Maybe if a C130 was involved.
I have a radar gun if anyone wants to try a test with a stocker.
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  #24  
Old 6th December 2019
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Speeds achieved on a salt flat at 4320 feet above sea level won't be as impressive as what you can do on black top at sea level.

Up to 100 mph wind drag is a slight nuisance. Above that speed full fairings are a huge advantage.

At Phillip Island the main straight is 3.3 miles long. Abd it's downhill. (slopes down)
And it's about 150 feet above sea level.
If your going to hit top speed anywhere that's a good place to try.

They have a radar gun for clocking you.

Two caveats. The radar gin is near the start finish line and you pick up a bit more before the end of the straight as that part makes the steepest descent.
The other is the wind factor coming in off the ocean. Plus or Minus 20 MPH.

It's very hard to compare apples with apples most places. Conditions change.

It's often very interesting to see the "fast guys" on the street turn up to a track for the first time. A clue here. It can be very humbling.

Am I faster now than 50 years ago ? (MY youth). Certainly not.

*But my bikes are !
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  #25  
Old 6th December 2019
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One of the members here, has (or had in recent years) the fastest land speed modified pushrod triumph.
It was around 133 MPH (on 1.5 mile tracks, not salt) and it was far from road going trim.
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  #26  
Old 6th December 2019
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Up to 100 MPH is easy. Over that it starts getting progressively harder and harder.

My mate Rex on his "shade tree" LC Yamaha 350 runs over 135 at Philip Island.
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  #27  
Old 6th December 2019
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Yesterday, at Lakeside I lost a $500 GoPro. Tie wired to the frame and all.

I was just going out to test the new fuel system and was just going to "tool around".

But there were a couple of new guys on moderns out there and me being me I got into it with them.

The GoPro mounts will NOT withstand wind speeds above 100 MPH. I have 5 broken mounts to prove that. But the tie wire has always saved them. This time the case broke. I still have the tie wire thankfully.

Then I broke a primary belt going up the eastern loop.

So yesterday cost me about $800 for 8 laps. At over 102 Fahrenheit.

Luckily for me, the heat killed all the flies !
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  #28  
Old 7th December 2019
RicThompson RicThompson is offline
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Having owned and ridden an 01 Honda RC51 SP1 for 12 years I think going over 100 mph on a pre 80's anything would terrify me. Not just the open bike but the mediocre suspension and tires. That said I thoroughly enjoy running my Harleys through the gears sometimes faster than Johnny Law appreciates.
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  #29  
Old 7th December 2019
Iron Mike Iron Mike is offline
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Its not the speed that took out the gopro, more than likely the frequency of the vibes. I have ;ots of go ro footage at way over 100 mph. in much rougher conditions than an asphalt track.
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  #30  
Old 7th December 2019
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The GoPro's balance factor not correct?
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