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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #21  
Old 26th July 2021
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Desertfox Desertfox is offline
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Quote:
Originally Posted by Ferrous Head View Post
I was the only sidecar entered. Not a Suzuki to be seen. Factory or otherwise.

So, how to find out ?

How many people here still race their IH's ?
Anyone racing side car is badass in my book .
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  #22  
Old 26th July 2021
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I roadraced my backbone framed, Thunderhead equipped IH at Loudon, NH in June. I’ll be back on Labor Day. Bike was surprisingly competitive in a straight line. Front brake made deceleration scary. Rather than re-engineer the Ceriani/Honda front end, I’m grafting a Moto Guzzi T3 fork onto it with dual Brembos. I quickly learned that being able to effectively slow down is key to going fast.
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  #23  
Old 26th July 2021
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Ferrous Head Ferrous Head is offline
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Ah HA !

A racer !

Fantastic. Here's something I learned a long time ago.

To be fast, you have to be fast in the fast places.

It's all about the distance you travel. Down the straights at (for example) your traveling at 100 mph. you will travel 250 yards in 5 seconds. In a slow corner at 50 mph you travel only 125 yards. If your losing a second in a corner you drop 25 yards. But if you gain a second down the straight you pick up twice that.
If you could ride at the speed of light down the straights you could walk around the corners and still win.

But yes, being able to leave your braking later than anyone else picks up a lot of time. Or loses it if you can't.

Disc brakes can change everything. Including how you ride. You'll find yourself "squaring off" the corner instead of sweeping through them.

The end of the straights are the fastest parts of the track. Holding your speed as long as you can means you cover more ground and puts you closer to the checkered.
You can't use the front brake hard when cranked over so you do most of your braking while still going straight, going deeper into the corner, then making a quicker turn and getting it upright as fast as you can. So you can blast back out of the corner.

This means your frame and suspension need to be up to scratch as well as your now asking them to do more.

Both the Guzzi's and the Ducati's had pretty good stock suspension and brakes.

A stock Ironhead can't run with them.
But a "hot rodded" one will. I've seen it at Philip Island.
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  #24  
Old 26th July 2021
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Quote:
Something tells me you may still qualify for the trials youngster class! Post 70yr olds are the majority here today at the trials event.
If over 70 is the "youngster" class then I'm in.

But if you look closely at the creek in your picture you can see where my bike made an imprint in the tree. Luckily, I just landed in the mud.

My Doc tells me I have o have a hip replacement. I've been putting it off as I wouldn't be able to ride for some time afterwards. But I now have a knee problem as well.

If I was to do Trials it would have to be in "Heavy Weight" - I can't ride those two stroke thingy's. (I fall off them - a lot.)
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  #25  
Old 26th July 2021
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Quote:
Originally Posted by brucstoudt View Post
the motor was too big for the AMA 750 cc limit..except for the TT class.it was KR or XR.
There is absolutely no reason why HD could not have de-stroked the engine to build to the class limit.
They could have also forced the AMA to start a 1000cc class. All they had to do was build a race bike for that 1000cc class and then refuse to back the 750 class until it was done.
They could have raced in Europe. They had an Unlimited class there.

I think they just thought by sticking to what had worked in the past they would be OK. Trying to set rules and classes to keep Harley competitive was a mistake. Refusing to accept that the rest of the world didn't matter was an even bigger one.

Lance Weil proved an Ironhead could be competitive in Europe against their best at the time. Why Harley didn't pick up on that is beyond me.
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  #26  
Old 26th July 2021
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Quote:
Originally Posted by Ferrous Head View Post
There is absolutely no reason why HD could not have de-stroked the engine to build to the class limit.
well they did but it took them until 1970 to do it.the KR was still kicking ass before then.
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  #27  
Old 26th July 2021
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What they really needed to do was build an Xl version of that engine.

The limited XLR version wasn't going to attract "home builders".

While thousands of people bought Triumphs and Nortons and converted them into acceptable race bikes the Ironhead just wasn't there.
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