MK 3 FRAME

dero · Aug 8, 2014

Is there any reason why a MK3 frame would not be suitable for a Mk2 rebuild ?

Torontonian · Aug 8, 2014

Other than anal authenticity types it's probably a stronger frame.

baz · Aug 8, 2014

the mk111 has a seat hinge

dero · Aug 8, 2014

So Mk2 engine , wheels , brakes etc any problem ?

Ron L · Aug 8, 2014

baz said:
the mk111 has a seat hinge

But the seat hinge can be unbolted!

baz · Aug 9, 2014

Ron L said:
baz said:

the mk111 has a seat hinge

Click to expand...

But the seat hinge can be unbolted!

Didn't know that I have never looked at a m111 frame I have only looked at the seats .... cheers baz

.

olChris · Aug 9, 2014

dero said:
Is there any reason why a MK3 frame would not be suitable for a Mk2 rebuild ?

Not at all.... IMO... if you want to look and nit pick the two frames i have one of each (72+75) on wheels and im in Mandurah WA.. PM me if you want. Open all hours.

dynodave · Aug 9, 2014

The MKIII frame has a different steering lock.
The MKII cradle has a fixed gearbox hole at the top and not the adjustable slot.
The MKIII swing arm is for the MKIII wheel/brake.
I see nothing to indicate any strength difference from regular 73 or 74 frame

Torontonian · Aug 9, 2014

True ,subrame and swingarm are only for that 75 year. The "frame" is a tad stronger at the rear frame loop support area to help prevent the loop sagging from passengers and gear weight.

kommando · Aug 9, 2014

The MKII cradle has a fixed gearbox hole at the top and not the adjustable slot.

MK111 typo I assume

And the MK111 does have one minor strengthening feature which is the longer support brackets for the rear seat hoop so the hoop does not droop.

Torontonian · Aug 9, 2014

It's a typo for sure.

It'll cost him a seal for my next project. :wink:

dynodave · Aug 9, 2014

kommando said:
The MKII cradle has a fixed gearbox hole at the top and not the adjustable slot.

Click to expand...

MK111 typo I assume

And the MK111 does have one minor strengthening feature which is the longer support brackets for the rear seat hoop so the hoop does not droop.

Yes typo /sticky keyboard
However, I will have to double check more frames since the (1973) 06-4041 I have out back has the rear loop reinforcement except it is on the inside rather than outside like the MKIII.
I have 2 more 850 (non MKIII) frames at the other storage facility.

ADDED: the other two frames, both 73, DO have the reinforcing gussets.

L.A.B. · Aug 9, 2014

dynodave said:
I will have to double check more frames since the (1973) 06-4041 I have out back has the rear loop reinforcement except it is on the inside rather than outside like the MKIII.

MkIII (06-5632) frames have one elongated reinforcement plate on the outside of the shock (left side) this doubles-up as the seat hinge mounting bracket, but, on the other side of the frame the plate is on the inside due to the seat lock, however, as we have seen, some very late MkII/IIA frames apparently had the MkIII style plates, but both on the inside.

As you said, some (late) '1973' 06-4041 frames appear to have the extended triangular inner reinforcement plates, which begs the question why the '1974' frame part number changed to 06-5404 as there's no other apparent difference between them that I'm aware of?

Gino Rondelli · Aug 9, 2014

I re framed a written off 72 750 into a mk 3 I had lying around, no issues, indeed a better frame , nobody notices and if they did I wouldn't care

Fast Eddie · Aug 9, 2014

L.A.B. said:
dynodave said:

I will have to double check more frames since the (1973) 06-4041 I have out back has the rear loop reinforcement except it is on the inside rather than outside like the MKIII.

Click to expand...

MkIII (06-5632) frames have one elongated reinforcement plate on the outside of the shock (left side) this doubles-up as the seat hinge mounting bracket, but, on the other side of the frame the plate is on the inside due to the seat lock, however, as we have seen, some very late MkII/IIA frames apparently had the MkIII style plates, but both on the inside.

As you said, some (late) '1973' 06-4041 frames appear to have the extended triangular inner reinforcement plates, which begs the question why the '1974' frame part number changed to 06-5404 as there's no other apparent difference between them that I'm aware of?

My MkIIa frame, stamped 06/74, is gusseted as you state LAB.

Snorton74 · Aug 9, 2014

Fast Eddie said:
L.A.B. said:

dynodave said:

I will have to double check more frames since the (1973) 06-4041 I have out back has the rear loop reinforcement except it is on the inside rather than outside like the MKIII.

Click to expand...

MkIII (06-5632) frames have one elongated reinforcement plate on the outside of the shock (left side) this doubles-up as the seat hinge mounting bracket, but, on the other side of the frame the plate is on the inside due to the seat lock, however, as we have seen, some very late MkII/IIA frames apparently had the MkIII style plates, but both on the inside.

As you said, some (late) '1973' 06-4041 frames appear to have the extended triangular inner reinforcement plates, which begs the question why the '1974' frame part number changed to 06-5404 as there's no other apparent difference between them that I'm aware of?

Click to expand...

My MkIIa frame, stamped 06/74, is gusseted as you state LAB.

Same here.

dynodave · Aug 9, 2014

L.A.B. said:
MkIII (06-5632) frames have one elongated reinforcement plate on the outside of the shock (left side) this doubles-up as the seat hinge mounting bracket, but, on the other side of the frame the plate is on the inside due to the seat lock, however, as we have seen, some very late MkII/IIA frames apparently had the MkIII style plates, but both on the inside.

As you said, some (late) '1973' 06-4041 frames appear to have the extended triangular inner reinforcement plates, which begs the question why the '1974' frame part number changed to 06-5404 as there's no other apparent difference between them that I'm aware of?

Well rationalizing into production cycle the MKIII reinforcement plates and dropping the simple triangle reinforcement would be enough for a PN change.
I own 4-MKIII and 3-73 850 frames, but alas NO 74's

L.A.B. · Aug 9, 2014

dynodave said:
Well rationalizing into production cycle the MKIII reinforcement plates and dropping the simple triangle reinforcement would be enough for a PN change.

The frame part number changed for the MkII/IIA, as the 06-5404 number appears in the MkII/IIA (from 307311) parts supplement, so around late '73, the MkIII plates didn't appear to be used until quite some time later, towards the end of 1974 (32xxxx) therefore the MkIII plates could not have been the reason for the part number change.
I'm assuming Fast Fred and Snorton74 were in fact referring to the triangular extension gusset plates?

Snorton74 · Aug 9, 2014

L.A.B. said:
dynodave said:

Well rationalizing into production cycle the MKIII reinforcement plates and dropping the simple triangle reinforcement would be enough for a PN change.

Click to expand...

The frame part number changed for the MkII/IIA, as the 06-5404 number appears in the MkII/IIA (from 307311) parts supplement, so around late '73, the MkIII plates didn't appear to be used until quite some time later, towards the end of 1974 (32xxxx) therefore the MkIII plates could not have been the reason for the part number change.
I'm assuming Fast Fred and Snorton74 were in fact referring to the triangular extension gusset plates?

I certainly was.

dero · Aug 11, 2014

Thanks for the replys... Can a Mk2 cradle be fitted to a Mk3 frame ?
Olchris I will probably take you up on your offer Thanks PM you later .

MK 3 FRAME

dero

Torontonian

baz

dero

Ron L

baz

olChris

dynodave

Torontonian

kommando

Torontonian

dynodave

L.A.B.

Moderator

Gino Rondelli

Fast Eddie

Snorton74

dynodave

L.A.B.

Moderator

Snorton74

dero

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