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XR Sportster Motorcycle Talk - XR750, XR1000, XR1200 For XR Sportsters: XR750, XR1000, XR1200

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  #1  
Old 20th March 2018
Ftrack51 Ftrack51 is offline
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Default Iron XR750 advice

Just joined the XL Forum as I am looking for advice on building an iron XR motor ideally in the late '71 factory team configuration with two rear mounted carbs and front exhausts.
Q.1: which H-D workshop manual best reflects the internals of this motor, '59-69 K KH XL XLH XLCH or '70-78 XL XLH XLCH, or are any differences minimal/irrelevant?
Q.2: is there any source of NOS or useable flywheels and con-rod sets? Will rods from an alloy XR do the job?
Q.3: I have been told to look for -57 heads with small ports but there appears to be a choice of casting numbers 16681, 16682, 16683 and 16684. Which are best?
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  #2  
Old 30th March 2018
barefoot barefoot is offline
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Sportster/Buell Model: XR 750
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Quote:
Originally Posted by Ftrack51 View Post
Just joined the XL Forum as I am looking for advice on building an iron XR motor ideally in the late '71 factory team configuration with two rear mounted carbs and front exhausts.
Q.1: which H-D workshop manual best reflects the internals of this motor, '59-69 K KH XL XLH XLCH or '70-78 XL XLH XLCH, or are any differences minimal/irrelevant?
None of those. The iron XR is closer to the XLR than any of those. Even then the crank is different.

Quote:
Q.2: is there any source of NOS or useable flywheels and con-rod sets? Will rods from an alloy XR do the job?
Flywheels no. Conrads are the same as the current XR. Or similar enough to use, anyhow. In iron XR days they had pressed-in races. New ones are carburized one-piece, otherwise the same. There's also 1" longer ones of the same design that you could use but those would be old. The crankpin is different and many of the bearings are different.

Quote:
Q.3: I have been told to look for -57 heads with small ports but there appears to be a choice of casting numbers 16681, 16682, 16683 and 16684. Which are best?
It doesn't matter. If you plan to duplicate any of the factory bikes you'll be getting real friendly with brass rod and a torch. They were brazed up by hand.

Lots of work involved for second-rate stuff. Easiest way to get where you want to go is probably scrounge a current XR and fit iron heads and barrels. The iron XR stuff broke. A lot. The crank is particularly bad.
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  #3  
Old 1st April 2018
Ftrack51 Ftrack51 is offline
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Many thanks for the information; that certainly helps to map out the project.
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  #4  
Old 2nd April 2018
barefoot barefoot is offline
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Originally Posted by Ftrack51 View Post
Many thanks for the information; that certainly helps to map out the project.
Ja, building an iron xr as it was done in 1970 would be replicating all the things that broke, not making something nice. You can't tell from the outside that an alloy xr is not an iron one (except for the heads and barrels) but they fixed a bunch of stuff internally. The whole crank arrangement is different. Just use late-model stuff.

Late-model in this case means 1972

It would be like reproducing an early 6V92, when they broke a lot. The later good ones look exactly the same but work great, so why copy stuff that's bad ?
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Old 2nd April 2018
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  #6  
Old 2nd April 2018
Ftrack51 Ftrack51 is offline
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Thanks again Barefoot, I will aim to set up the iron motor like my alloy XR, or alternatively look for a turbo-diesel truck engine ;-)
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Old 4th April 2018
barefoot barefoot is offline
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... alternatively look for a turbo-diesel truck engine ;-)
If yer lookin for the race version, maybe an 8V53. Mmm, do they sound nice
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