Unknown K Top Motor Mount Spacer

All things K & Sportster

Unknown K Top Motor Mount Spacer

Postby JerrryR » Tue Jan 14, 2020 10:09 pm

Hi All,
I was looking at my K Model top motor mount spacers and realized I had 3 sizes. The tallest I am comfortable believing is for the 52-53K. What I am confused about is of the shorter ones, which one height wise is the 54-56KH spacer and what is the odd sized one for?
Thanks in advance for your insights,
JerryR

Spacers.jpg
Spacers.jpg (370.29 KiB) Viewed 2712 times


3 Spacers.jpg
3 Spacers.jpg (31.76 KiB) Viewed 2712 times
User avatar
JerrryR
 
Posts: 350
Joined: Sun Jul 20, 2014 9:39 pm

Re: Unknown K Top Motor Mount Spacer

Postby wz507 » Tue Jan 14, 2020 11:04 pm

I believe the middle one is for KH and the shortest is for a WL.

Attention - The above red text suggestion has been found to be incorrect - apologies. Continue reading below for updated information. Jan 24, 2020.

Measurements were made on 4 stools from a ’56 KHK and all stools were found to be 1.064” long. A request was made to a friend to measure his stock of K and KH stools and he reported lengths of 1.435” and 1.064” respectively for the subject stools.

The above reported difference in stool length aligns very well with the difference in stroke specifications between the K and KH engines. The KH engine has 0.750” longer stroke, so the KH cylinder is 0.375” taller (0.750/2 = 0.375”) than a K model cylinder. All other things be equal, for the longer KH cylinder the stool would then have to be 0.375” shorter to position the top motor mount at the same relative height in the frame. Thus, if the K stool is 1.435” long, then the KH stool would have to be 0.375” shorter, i.e., 1.060” long (1.435 – 0.375 = 1.060”), which is within a few thousandths of an inch of the results reported above for KH stool length.

These results suggest that the difference in K and KH stool lengths might now be properly identified. However, the mystery still remains regarding the 1.128” intermediate length stool and what it fits. Perhaps the only option remaining is a stool for the 45” WL series engines?
Last edited by wz507 on Fri Jan 24, 2020 7:20 pm, edited 2 times in total.
wz507
 
Posts: 275
Joined: Fri Dec 11, 2015 9:13 pm

Re: Unknown K Top Motor Mount Spacer

Postby hayleyl » Tue Jan 14, 2020 11:15 pm

Jerry, I belive tallest head bolt spacer is for K, KK, KR (750 cylinders), middle is KH, KHK (883 cylinders) and shortest WLA, WL, WLC etc. Cheers Hayley.
hayleyl
 
Posts: 117
Joined: Sun Aug 09, 2015 8:34 pm
Location: Victoria-Australia

Re: Unknown K Top Motor Mount Spacer

Postby EKHKHK56 » Wed Jan 15, 2020 12:46 am

888 Cyl its not a Sportster!!! :mrgreen: 10-4 on the W app...
User avatar
EKHKHK56
 
Posts: 1007
Joined: Fri Apr 18, 2014 5:20 am
Location: Fairbanks, Alaska USA

Re: Unknown K Top Motor Mount Spacer

Postby panic » Wed Jan 15, 2020 9:49 am

KH 54.002", 884.93cc
[url="http://victorylibrary.com/L-BK.htm"]The Linkert Book[/url]
User avatar
panic
 
Posts: 38
Joined: Mon Jul 29, 2019 5:33 pm

Re: Unknown K Top Motor Mount Spacer

Postby JerrryR » Sat Jan 25, 2020 10:28 am

Hi All,
WZ, Stan and Yarddog checked their K spacers and it appears as though the 54-56Ks used the shortest 1.06" versions. That leaves the question of what are the 1.12" spacers for? If someone with a WL would please check their spacers we could nail this down.
Thanks,
JerryR
User avatar
JerrryR
 
Posts: 350
Joined: Sun Jul 20, 2014 9:39 pm

Re: Unknown K Top Motor Mount Spacer

Postby strong56KH » Sat Jan 25, 2020 2:39 pm

I bought some spacers several years ago from a Harley dealer that they had labeled 16860-54 and wondered if they were labeled wrong since they were slightly longer than the ones I had. I found that the edge of the motor mount interferes with the control coil clip sitting square over the control coil (for throttle) when using the shorter spacers. I thought recently from this post that maybe the ones I got from the dealer were correctly numbered, but maybe the clip clamping the cable at an angle is normal? If the longer spacers are used, the edge of the mount clears the clip and is no longer an issue. Just an observation.
strong56KH
 
Posts: 159
Joined: Sat Oct 18, 2014 6:00 pm
Location: Virginia

Re: Unknown K Top Motor Mount Spacer

Postby wz507 » Sat Jan 25, 2020 3:35 pm

strong56KH wrote:I found that the edge of the motor mount interferes with the control coil clip sitting square over the control coil (for throttle) when using the shorter spacers.

Here’s how the throttle control coil clamp fits the coil on a KHK engine assembled with the 1.064” stools – just clears the top motor mount and appears to cover the full coil diameter. Another wild card in these observations is the clamp itself, and perhaps the clamp shown is shorter than the one you are using. I certainly appreciate how a different and slightly larger/longer clamp would cause the interference you observe.

LR throttle cable clamp looking rearward.jpg
LR throttle cable clamp looking rearward.jpg (57.25 KiB) Viewed 2424 times

LR throttle cable clamp looking forward.jpg
LR throttle cable clamp looking forward.jpg (47.5 KiB) Viewed 2424 times
wz507
 
Posts: 275
Joined: Fri Dec 11, 2015 9:13 pm

Re: Unknown K Top Motor Mount Spacer

Postby strong56KH » Sat Jan 25, 2020 5:26 pm

Thanks for posting the photos. That's the exact same clamp I have so I'll loosen the motor mount bolts and see if there is any wiggle room.
strong56KH
 
Posts: 159
Joined: Sat Oct 18, 2014 6:00 pm
Location: Virginia

Re: Unknown K Top Motor Mount Spacer

Postby strong56KH » Sun Jan 26, 2020 11:31 am

Palmer indicates (pg. 203) that the 45 spacers (spools) raise the motor mount up 1-1/8" from the heads. This is the length of the 1.12" spacer when measured with a ruler.
strong56KH
 
Posts: 159
Joined: Sat Oct 18, 2014 6:00 pm
Location: Virginia

Next

Return to General K / Sportster Discussions

Who is online

Users browsing this forum: No registered users and 7 guests