Board index Flathead Power-Technical Questions, Answers, and Suggestions Knuckles Late 1947 big twin frame?

Late 1947 big twin frame?

Moderators: Curt!, Pa

Post Sat Jan 03, 2009 5:20 pm

Posts: 11
Can anyone one tell me around what vin# they starting using the late B.T. 47 Frame? (after the Bull neck)I have a EL motor with a vin# around 47EL3050 and a UL1190.Would this be correct for either one?Did 30 degree bullneck (mid 46-47) frames ever take a inline springer?When did they start using the springer shock?Thanks

Post Sat Jan 03, 2009 6:43 pm

Posts: 607
Location: Menomonie, Wisconsin, USA
Well You have a bunch of questions but I will try to help on a few of them. I believe that your knuckle 3050 should use the early 47 frame - I usually think that the later frame showed up around 6500. The UL I do not really have a clue but I suspect that most UL's in 1947 were early production although they did not make very many. Some mid production 1946 bikes (probably about serial number 4000) probably came with a in line springer on a 30 degree frame.

Jerry

Post Tue Jan 06, 2009 11:02 pm

Posts: 2685
Location: Los Angeles, CA
I have never seen an original 1946 that didn't have an offset fork.

Post Wed Jan 07, 2009 8:18 pm

Posts: 2399
Location: atascadero cal usa
When did they start using the springer shock?
1945
but that also depends on what model
they never used on on the wr that was in production till 52

Post Sun Jan 11, 2009 11:43 am

Posts: 87
Location: Finland, Europe
Chris Haynes wrote:
I have never seen an original 1946 that didn't have an offset fork.


My '46 UL #<1200 has inline fork, thin fender brazes and bullneck frame. I believe that it is a correct setup, and not a long ago assembled basket case. But you never know, until someone comes up with an unrestored, untouched early UL/FL that is different.

Good continuation of 2009.
Theory: Everything is perfectly right, but it does not work.
Practice: It works but you do not know how.
We combined theory and practice: Nothing works and nobody knows why!

Post Sun Jan 11, 2009 8:46 pm

Posts: 2685
Location: Los Angeles, CA
Fiskis wrote:
Chris Haynes wrote:
I have never seen an original 1946 that didn't have an offset fork.


My '46 UL #<1200 has inline fork, thin fender brazes and bullneck frame. I believe that it is a correct setup, and not a long ago assembled basket case. But you never know, until someone comes up with an unrestored, untouched early UL/FL that is different.

Good continuation of 2009.


If you have an inline fork on a bullneck frame the fender will hit the engine guards.

Post Sun Jan 11, 2009 10:01 pm

Posts: 426
Location: Tucson Arizona

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Last edited by Kurt on Mon Jan 12, 2009 2:25 pm, edited 1 time in total.

Post Sun Jan 11, 2009 10:33 pm

Posts: 607
Location: Menomonie, Wisconsin, USA
Not to far from me there is a 1946 FL with the 30 degree frame and inline springer - vin in the low 4000's. I know of 3 original 29 degree frame and inline springer bikes from 1946. One was an original bike that Premont HD in Quebec Quebec now owns or did recently - it originally belonged to a friend of mine that passed away about 8 years ago - vin was 2500's. The other one is owned by a friend of mine about 40 miles from me - this vin is 46FL17xx.

.... and yes I know that this goes against what you've all read in the BIBLE.

Jerry

Post Mon Jan 12, 2009 11:57 pm

Posts: 693
Location: somerset, oh usa
And to that list you can add my 46el that's a tad under 2000 series. Hallmark on the sprung leg is 15.

Post Sat Jan 17, 2009 10:50 am

Posts: 19
Location: Valentine, NE 69201
I have two 47 knuckles, one in the 7600 range and one in the 11400 range. These both came to me with 29 degree necks and offset springers. Is this correct? I got one in 1968 and the other in 1972. That still does'nt mean that a frame switch couldn't have taken place. Thanks for any help.
Steve
It's a hard life if you don"t weaken.

Post Sat Mar 14, 2009 9:42 am

Posts: 87
Location: Finland, Europe
Chris Haynes wrote:
Fiskis wrote:
Chris Haynes wrote:
I have never seen an original 1946 that didn't have an offset fork.


My '46 UL #<1200 has inline fork, thin fender brazes and bullneck frame. I believe that it is a correct setup, and not a long ago assembled basket case. But you never know, until someone comes up with an unrestored, untouched early UL/FL that is different.

Good continuation of 2009.


If you have an inline fork on a bullneck frame the fender will hit the engine guards.



Hi Chris,

Guess I must be careful riding... Ok, a joke, but the fender is not even near the guard.

Fiskis
Theory: Everything is perfectly right, but it does not work.
Practice: It works but you do not know how.
We combined theory and practice: Nothing works and nobody knows why!

Post Sat Mar 14, 2009 2:58 pm

Posts: 391
Actually Chris is going the wrong direction. An inline fork on a bullneck or late knuckle frame makes the distance GREATER than stock and the bike sits low. An offset fork on an earlier frame will make the fender hit the guards. Oh, and on the '47 knuckles, are you sure you have 29 degree frames or are they 30 degree late knuckle frames, which do not have a bullneck and look similar to a '41to '45 frame. Virtually all the 5 digit knuckle serial # bikes I have seen that are original have them and some earlier ones. Don't know when they changed but i think it was on another thread at some point.
Robbie

Post Sat Mar 14, 2009 7:17 pm

Posts: 2685
Location: Los Angeles, CA
Sorry, I meant to say long rake neck.

Post Sun Mar 15, 2009 2:47 am

Posts: 65
Location: Aberdeen, SD

I have a 46 EL that is original paint and was a one owner bike that I bought last year that has an inline fork and a bull neck frame serial # in the late 3900's. This bike was virtually untouched except for gas tank removal when we got it in service, a true virgin.
Carl

Post Mon Mar 16, 2009 5:54 pm

Posts: 87
Location: Finland, Europe
A buddy has 47UL35xx with bullneck and offset springer. Same combination on a 47EL46xx.

Installed on a similar frame, the offset fork gives less wheelbase but more ground clearance compared to an inline fork. I have read somewhere that H-D tried to improve the handling of bikes with 16" wheels.

Fiskis
Theory: Everything is perfectly right, but it does not work.
Practice: It works but you do not know how.
We combined theory and practice: Nothing works and nobody knows why!


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