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Author Topic: HD XR750 Replica?  (Read 3267 times)

Offline Mr.B

  • Posts: 160
  • Everybody likes curves, when we talk about roads.
HD XR750 Replica?
« on: Jan 21, 2013, 09:13:15 »
Hi, has anyone here tried to build a XR750 replica (or look-a-like)?

I'm not thinking about the Sportster tracker kit (It doesn't have the same look, guessing it's the frame, but cant really put my finger on it)
But as close as you can get.

What HD engine is the one the resembles the XR's engine the most?
I was thinking that an XLCH Engine (ca 1968-74?) would be similar (and wouldn't be to pricey or hard to find for me).
But what frame would be a good starting point? I'm guessing that the xr750 frame was built for the flattracker scene and never built as a regular production bike.
So what frame needs the least amount of modification to make it look the same?

This is the picture I'm looking at,



Ideas are as always welcomed!
« Last Edit: Jan 21, 2013, 09:54:43 by Mr.B »
//Broberg
Don't forget, Vikings only @ http://www.dotheton.com/forum/index.php?board=88.0

Offline Dutch Von Shed

  • Posts: 71
    • The Bike Shed
Re: HD XR750 Replica?
« Reply #1 on: Jan 21, 2013, 09:30:31 »
Nice project! Look forward to seeing this come to life!

Offline Garage Rat

  • Posts: 2758
Re: HD XR750 Replica?
« Reply #2 on: Jan 21, 2013, 09:33:33 »
I really should have built my bike along these lines. The roads around here are not condusive for Cafe' racing.
STFU and Ride!

http://www.dotheton.com/forum/index.php?topic=13948.0

Classic and Custom: Repair, Restoration and Fabrication!

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Offline Mr.B

  • Posts: 160
  • Everybody likes curves, when we talk about roads.
Re: HD XR750 Replica?
« Reply #3 on: Jan 21, 2013, 09:43:18 »
I have to point out this is project is a couple years in the future for me (unless someone practically gives me an HD engine for free).
Just gathering some basic information at the moment :)
//Broberg
Don't forget, Vikings only @ http://www.dotheton.com/forum/index.php?board=88.0

Offline cobraace2

  • Posts: 240
Re: HD XR750 Replica?
« Reply #4 on: Jan 21, 2013, 10:33:14 »
Hi, has anyone here tried to build a XR750 replica (or look-a-like)?

I'm not thinking about the Sportster tracker kit (It doesn't have the same look, guessing it's the frame, but cant really put my finger on it)
But as close as you can get.

What HD engine is the one the resembles the XR's engine the most?
I was thinking that an XLCH Engine (ca 1968-74?) would be similar (and wouldn't be to pricey or hard to find for me).
But what frame would be a good starting point? I'm guessing that the xr750 frame was built for the flattracker scene and never built as a regular production bike.
So what frame needs the least amount of modification to make it look the same?

This is the picture I'm looking at,



Ideas are as always welcomed!

That bike in the picture is a 1970/1971  xr750 the only years they used iron heads . In 1972 the alloy XR came out  and Harley domination started  8) that is the cheapest  model to replicate . You need a pre 1974 right hand shift iron head engine and a 1977/1978 xlcr frame good luck  $$$$ or get a 1979 frame and mode the tail section 

Offline Mr.B

  • Posts: 160
  • Everybody likes curves, when we talk about roads.
Re: HD XR750 Replica?
« Reply #5 on: Jan 21, 2013, 10:48:55 »
That bike in the picture is a 1970/1971  xr750 the only years they used iron heads . In 1972 the alloy XR came out  and Harley domination started  8) that is the cheapest  model to replicate . You need a pre 1974 right hand shift iron head engine and a 1977/1978 xlcr frame good luck  $$$$ or get a 1979 frame and mode the tail section


This is exactly the information I'm after :D
So the engine from an XLCH 1974 (and older) would be an acceptable look-a-like (at least what I could see on the ones that are for sale in Sweden at the moment).
About the frame, the XLCR seems to be (as you stated) quite hard to find. I'm not afraid to cut in to the frame but the less work the better.
If not the XLCR, are their any other frames that are somewhat close and easier to find (and less pricey)?

I guess with a lot modification I could re-use the frame of an XLCH (1973) or is it better to make a frame from scratch in that case?
//Broberg
Don't forget, Vikings only @ http://www.dotheton.com/forum/index.php?board=88.0

Offline cobraace2

  • Posts: 240
Re: HD XR750 Replica?
« Reply #6 on: Jan 21, 2013, 11:08:08 »

This is exactly the information I'm after :D
So the engine from an XLCH 1974 (and older) would be an acceptable look-a-like (at least what I could see on the ones that are for sale in Sweden at the moment).
About the frame, the XLCR seems to be (as you stated) quite hard to find. I'm not afraid to cut in to the frame but the less work the better.
If not the XLCR, are their any other frames that are somewhat close and easier to find (and less pricey)?

I guess with a lot modification I could re-use the frame of an XLCH (1973) or is it better to make a frame from scratch in that case?

If you are looking for the cheapest option  the 1979 frame is it no other sportster frames will even be close . forget about the xlcr frame I sold a frame and cases for $2500  :o In my opinion its the 79 or custom$$$$ you get a 79 for about $300 and the mode is only in the tail section. You can build a sub 350lb 80/89 rwhp bike it will the most exciting ride you ever had unless your dating a porn star 8)

Offline lurkmaster2000

  • Posts: 91
Re: HD XR750 Replica?
« Reply #7 on: Jan 21, 2013, 11:24:35 »
It would seem to me that you could make one out of any sportser, just need to de-rake the neck and change the tail. The plastics are easy to find.  Best to get a complete running bike with the shouldered aluminum rims.  The forks are ceriani?

Offline cobraace2

  • Posts: 240
Re: HD XR750 Replica?
« Reply #8 on: Jan 21, 2013, 11:29:03 »
It would seem to me that you could make one out of any sportser, just need to de-rake the neck and change the tail. The plastics are easy to find.  Best to get a complete running bike with the shouldered aluminum rims.  The forks are ceriani?

Have a quick look on EBAY at  sportster frames and you will see why that's not true ;)

Offline DrJ

  • Posts: 4122
Re: HD XR750 Replica?
« Reply #9 on: Jan 21, 2013, 12:19:57 »
What HD engine is the one the resembles the XR's engine the most?

The XR1000 was the closest thing to a street version of the XR750 and probably the fastest air-cooled production Harley ever built. Unfortunately they are very rare, even more than the XLCR.



Offline cleoncleon

  • Posts: 177
Re: HD XR750 Replica?
« Reply #10 on: Jan 21, 2013, 12:31:55 »
Engine-wise, you could prolly save a few bucks getting an old Ironhead/Sportser engine..
But yeah, I want to see this happen.

Offline lurkmaster2000

  • Posts: 91
Re: HD XR750 Replica?
« Reply #11 on: Jan 21, 2013, 13:13:51 »
Here it is from a current 883 Iron


Offline grancuda

  • Posts: 50
Re: HD XR750 Replica?
« Reply #12 on: Jan 21, 2013, 19:25:02 »
This will be a cool type of bike to build.

The XR1000 was the closest thing to a street version of the XR750 and probably the fastest air-cooled production Harley ever built. Unfortunately they are very rare, even more than the XLCR.

The current XR1200 is the fastest air cooled production HD bike. 

NortonGuy

  • Guest
Re: HD XR750 Replica?
« Reply #13 on: Jan 22, 2013, 23:00:57 »
  I had this bike(and hair) about 25 years ago, it was an alloy xr750 from the last batch made in 1980. I put dummy lights on it and a disk brake on the front and rode it on the street for a year. I also took it down a 1/4 mile drag strip a few different weekends. It had very quick steering, at highway speeds you were almost better off riding it with your hands off the bars because the wind buffeting on your arms and shoulders would make it wobble if you sat upright.
 

 
The frames on these bikes were lightweight chromemoly. I had an extra frame and swingarm and I think bare it weighed about 24 pounds.
 
   Back when I had this bike the blueprints for these frames were floating around, a guy I used to talk to had got the blueprints for the road-race version of the XR frame and had made one up from them on his own. There was a guy in Chagrin Falls, Ohio named John Steel who was buying all these bikes up back in the 1980s and I am sure he is still into them, if you got hold of him he may be able to tell you how to get those blueprints as he was having replica XR frames made and trying to build and sell accurate replicas of the bikes.
 
   Yea, this was a quick bike, with around 100 rear-wheel horsepower and weighing in at a bit over 300 pounds. Off the line it was about as fast as a stock Sportster, but when it came on the cam the power felt like it at least doubled and the front wheel would come right off the ground. No kick or electric start, you just ran down the street, jumped on and popped the clutch. The racing exhaust was loud enough that a couple of State Police going the opposite way down a highway turned around and gave me a nice ticket one day, not a bad penalty for a whole season of riding fun.
 
   The iron motors will have about half the power of the alloy ones and they will be a LOT heavier. Back in the day no one could give away an iron XR, I knew where there was more than one of them that was brand-new, sitting because no one wanted to race or have them as collectors items. I suppose that changed once all the alloy jobs were snapped up. I had a few other old Harley XLR dirt-track racers too,  I got rid of them all mainly because the parts are so rare for the engines that if you blew one up you would never find the parts to fix it. The looked like street engines but every part in them was non-interchangeable.
 
    If I was going to live to be 150 I might put something together along the lines of the famous Aluminum Steamroller(google it) but using an early 90s alloy Sportster engine,  I think that Aluminum Steamroller was the best cross between an XR and a street-sportster ever built. If you build one you better make it so it has almost too much power for the chassis and give it very borderline and quick steering so you can have some of the feel of a real XR like I had, don't build a no-go show-boat.
 

Offline DrJ

  • Posts: 4122
Re: HD XR750 Replica?
« Reply #14 on: Jan 23, 2013, 08:21:49 »
I put dummy lights on it and a disk brake on the front and rode it on the street for a year.

Don't XR750s run without a charging system? Did you just charge up the battery every time you went for a ride?

Anyone interested in this motor?

http://ontario.kijiji.ca/c-cars-vehicles-motorcycles-other-1983-XR-1000-Motor-Brand-New-W0QQAdIdZ437235529
« Last Edit: Jan 23, 2013, 08:23:30 by DrJ »