Board index Flathead Power-Technical Questions, Answers, and Suggestions K-Models khk cases

khk cases

Moderators: Curt!, Pa

Post Sat Feb 05, 2011 4:49 am

Posts: 5
Hi, To every one. I am a new member that will need some help if thats ok. I have a 56 khk basket motor and frame and a 54kh basket motor frame. The 56 has non matching cases left side 24584-54 right side 24558-52 will i have problems building this motor or do i need a later right case. Any help appreciated

Post Sun Feb 06, 2011 3:21 am

Posts: 587
Location: Crewe, Great Britain

Hi, Beachsimmo70, Welcome here,

Both 1/2 cases were changed in 54 when K became KH. Right and left from the start to slightly change bolt locations around cylinder mouths due to longer KH stroke, then another left one in mid 54 when the trap door arrived.

Check your belly numbers on your 56 set, if they match, 556-xxxx, same xxxx serial # on both sides, you're OK, it's a matched set.

If the right belly is 552 or 553, it won't match the left one. If it's 554 or later you're also OK but will need to check all the bores/faces alignements, crank, mainshaft, cylinder decks and adjust accordingly... KH trap door is not a separate item like on the later Sportster, it was matched to each left case then lined bored so be careful there as well.

Only exception is if a "D" is stamped near the engine serial #, this indicates a replacement set of cases that has been moded by the factory to fit the Sportster trap door, 4 bolts and straight dowels rather than 6 and conical dowels on the KH.


Post Wed Feb 09, 2011 8:17 pm

Posts: 2
Thanks patrick for your help. The belly numbers are 555 and 554 so i should be right to buid witht these cases. I am after a set of khk cams for this motor if any one can help. Beachsimmo70.

Post Wed Feb 09, 2011 8:48 pm

Posts: 575
Location: devon,england
you missed a set last week on ebay
Dude, check out that jibhead, he's crazy. Hasn't been sober for 40 years

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