SUGGESTION: Add XLR (at least) to this Topic Heading

Racing K Models

SUGGESTION: Add XLR (at least) to this Topic Heading

Postby Noot » Fri May 08, 2020 3:01 pm

...then maybe we could get some XLR posts and feedback??? - Subjects explored may include....Aluminum Parts: fender struts, fork caps, foot pegs and motor mounts. XLR Specific Engine Parts: cylinder heads, pushrods, pistons, clutch baskets, hubs and clutch covers, camshafts and magnetos. XLR Chassis Parts: frames, levers, rims and brakes.
Noot
 
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Re: SUGGESTION: Add XLR (at least) to this Topic Heading

Postby hugoct » Fri May 08, 2020 3:47 pm

The proper name for the bike in question is "Sportster XLRTT".
At a minimum it is an XLRTT.
There never was an XLR.
All the Race Department Motor Test Cards refer to the bikes as XLRTTs whether as a complete bike or as a motor only.
It is the same as a KHRTT in that there never was a KHR.
I think we could add both the iron XR and XRTT as well as the alloy XR and XRTT.
The 1970 and 1971 XLRTT is the same motorcycle as a 1970 XR750 except for a few engine parts and chrome pipes.
hugoct
 
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Re: SUGGESTION: Add XLR (at least) to this Topic Heading

Postby Noot » Fri May 08, 2020 4:42 pm

70XR12.JPG
70XR12.JPG (86.52 KiB) Viewed 5239 times
70XR11.JPG
70XR11.JPG (113.22 KiB) Viewed 5240 times
My suggestion is already working ! Thanks for clarifying...
Noot
 
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Re: SUGGESTION: Add XLR (at least) to this Topic Heading

Postby thefrenchowl » Sun May 10, 2020 4:56 am

Hi,
Attachments
xlrtt1.jpg
1966 XLR-TT
xlrtt1.jpg (140.79 KiB) Viewed 5166 times
xlrtt2.jpg
1966 XLR-TT
xlrtt2.jpg (142.83 KiB) Viewed 5165 times
Flat Head Forever
https://web.archive.org/web/20071011184353/http://www.harleykrxlrtt.com/index.htm
I'm the one who has to die when it's time for me to die so let me live my life the way I want to...
thefrenchowl
 
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Re: SUGGESTION: Add XLR (at least) to this Topic Heading

Postby hugoct » Mon May 11, 2020 9:41 pm

XLRTT frames:
As delivered -52R from 1958 through 1969 (heavy version with a -57R steering head casting, crosswise footpeg mounts and R style footpeg mount on lower right frame rail).
-70R from 1970 through 1971
As raced same as above with the addition of the 1968-69 Hi Boy Low Seat frame

Mert Lawwill used a variety of frames of his and Jim Belland's design and fabrication.
hugoct
 
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Re: SUGGESTION: Add XLR (at least) to this Topic Heading

Postby thefrenchowl » Tue May 12, 2020 4:10 am

Hi Bill,

My frame is R, K type steering casting but with XL type stamped steel head steady and squashed top tube to clear rear head (post 1957), but the little footpeg bracket in front of tomahawk has been hacked off, just its remnants are still brazed to the frame.

It has the cross bracket and side stand bracket but no provision for std foot pegs holders, but they might have been cut down...

Also has XL type stronger/bigger fins seat casting (post 1957 as well).

Keep safe, have you received my SD card?

Patrick
Flat Head Forever
https://web.archive.org/web/20071011184353/http://www.harleykrxlrtt.com/index.htm
I'm the one who has to die when it's time for me to die so let me live my life the way I want to...
thefrenchowl
 
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Re: SUGGESTION: Add XLR (at least) to this Topic Heading

Postby hugoct » Tue May 12, 2020 10:55 am

Nothing in the mail yet
The -52R frame had at least 21 different changes to the configuration between 1952 and 1970.
Harley never changed the part number to a 52RA or RB or.....
The only difference between the -52R from (heavy) as used on the early KRs and all XLRTTs and the light frame of the same time period is the tubing gauge and the weight.
hugoct
 
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Re: SUGGESTION: Add XLR (at least) to this Topic Heading

Postby hugoct » Sun May 17, 2020 11:29 am

Some "R" aluminum parts:
58RA upper fork bracket
59R front motor mount plate
59R front motor mount plate spacer
60R rear wheel spacer
60R 19" large front brake with alum rim
60R alum fork tube cap
60R alum footpeg assy.
60R alum rear fender
60R alum rear fender support
60R alum oil tank brackets
60R alum number plates
61R 19" rear wheel assy (alum rim)
61R 19" alum rear rim
Last edited by hugoct on Tue May 26, 2020 3:05 pm, edited 5 times in total.
hugoct
 
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Re: SUGGESTION: Add XLR (at least) to this Topic Heading

Postby Noot » Thu May 21, 2020 3:03 pm

IMG_7180.JPG
IMG_7180.JPG (136.82 KiB) Viewed 4401 times
Terrorize the neighborhood ! Hopefully get to ride a lil' off road scrambles trails this weekend... This thing rips ! :lol:
Noot
 
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Re: SUGGESTION: Add XLR (at least) to this Topic Heading

Postby hugoct » Mon May 25, 2020 11:05 am

Sportster XLRTT pipes

K and Sportster parts supplement 1958
front 65455-58
rear 65490-58

R parts supplement 1959
front 55455-58
rear 65490-58

R parts supplement 1965
front 65455-65R chrome
rear 65490-65R chrome

R parts supplement 1966
same as 1965

R parts supplement 1968
front 65455 -58 chrome
rear 65490-58 chrome

Early XL performance bulletin drawings
"change length of XLR pipes to 40"
front add 3" (pipe is 37")
rear add 5" (pipe is 35")

1965 XL performance bulletin
There is no mention of changing the pipe length when XLR pipes are used.

HD blueprints
3/27/64
XLR pipes
-65R part numbers
Chrome plated and polished
1 3/4" X .049" wall
7/16/64 length changed from 40" to 38"
6/1/67 wall thickness changed from .035" to .049"
hugoct
 
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