service manual Info

Racing K Models

service manual Info

Postby Slacker » Sun Jun 16, 2019 9:41 am

I am new to this group. But I am not new to sportsters. Most of the stuff I build is a lot later. I just bought a shed full of KR parts. One motor is stamped 55kr it has 54R cases,16581-55r cylinders and the 691 #7 heads. The pistons have a slight dome with no I.D. that I can see the top ring has a lip with a expander ring that it sets in it looks to be std. bore. I have bought the race hand book and a parts book but I am looking for a service manual with no luck.I know a lot of it is like early sportster but I like to have all the info I can get. Any Ideas or info would be a great help Thanks Tim
Attachments
Boardwalk (1).jpg
This is the kind of stuff I build
Boardwalk (1).jpg (203.5 KiB) Viewed 3056 times
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Re: service manual Info

Postby Rubone » Sun Jun 16, 2019 9:11 pm

No service manuals were ever printed for the K series or any KR racers. The factory specification brochures are the closest and the non-illustrated parts lists.
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Re: service manual Info

Postby Simon » Sun Jun 16, 2019 10:03 pm

Let me know if you decide to sell any of the KR parts - I want to put together an early KR some day...
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Re: service manual Info

Postby hugoct » Mon Jun 17, 2019 1:45 pm

Can you share your motor numbers? I may have some history. The dome piston heads are a 69R part number.
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Re: service manual Info

Postby wz507 » Mon Jun 17, 2019 4:29 pm

The #7 head is a for a flat top piston. Is the squish/quench area in your heads flat or arced to receive a domed piston? Images of a #7 head (for flat piston) and #8 head (for dome piston) are shown below.

LR #7 head.jpg
LR #7 head.jpg (144.45 KiB) Viewed 2906 times


LR #8 head.jpg
LR #8 head.jpg (56.72 KiB) Viewed 2906 times
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Re: service manual Info

Postby Slacker » Mon Jun 17, 2019 5:04 pm

There dished
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Re: service manual Info

Postby Slacker » Mon Jun 17, 2019 5:15 pm

The heads are-60r with a 7 stamped in them
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Re: service manual Info

Postby Slacker » Mon Jun 17, 2019 5:21 pm

hugoct wrote:Can you share your motor numbers? I may have some history. The dome piston heads are a 69R part number.

they say-60r wont let me upload a pic just got home from work will work on the numbers thanks
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Re: service manual Info

Postby wz507 » Mon Jun 17, 2019 8:36 pm

wz507 wrote: Is the squish/quench area in your heads flat or arced to receive a domed piston?
Slacker wrote:They're dished


That's quite interesting, as a privateer must have converted the #7 heads into the dome-piston #8, -69R heads. Has "the shelf" on the #7 heads been totally removed and you now have a straight open trough feeding directly to the domed squish area as pictured above for the #8 head? Thanks.
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