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KZ750H Restoration 18 Mar 2020 17:21 #821194

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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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KZ750H Restoration 19 Mar 2020 15:55 #821243

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steel length of engagement is minimum 1 x dia . while cast aluminum is typically 1.5-2 x dia because it so much softer. thread coarseness also has a relationship to the material. if you want to go deep here is a calc i have used tribology-abc.com/calculators/e3_6e.htm

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KZ750H Restoration 19 Mar 2020 16:10 #821245

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here you can see you need a about 1.75 times the diameter with a steel fastener in 6061-t6. I don't know what alloy these engine cases are but it is for sure softer than 6061, i would assume you want at least 2x diameter
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KZ750H Restoration 20 Mar 2020 02:36 #821259

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Thanks guys. I'm wondering now if I should pull out the helicoils that are already in and replace them with longer ones. I put 1D inserts in (only had 1D and 3D and the 3D ones were too long). I've got some 2D ones on the way. I figure with the increase in diameter (for the aluminium threads) the 1D inserts are probably equivalent to having about 1.25 times diameter in a normal M6 thread. Thoughts?
1980 KZ750H (kzrider.com/forum/11-projects/612054-kz750h-restoration)
2000 BMW F650GS
2012 Honda Hornet
1993 Mini Cooper :)

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KZ750H Restoration 20 Mar 2020 02:54 #821260

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Looking at page 13 on this document the tensile strength of the base material is basically doubled (for smaller sizes) when using a 1D insert: media.boellhoff.com/files/pdf1/helicoil-plus-en-0100.pdf

A 1D insert in the head (assuming 150-200 MPa tensile strength) would mean that the insert is the stronger than a 4.6 steel screw (tensile strength 400MPa). I figure that should be fine, but I'll probably still swap them out :)
1980 KZ750H (kzrider.com/forum/11-projects/612054-kz750h-restoration)
2000 BMW F650GS
2012 Honda Hornet
1993 Mini Cooper :)

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KZ750H Restoration 21 Mar 2020 11:20 #821307

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Swapped out all seven helicoils with longer ones today. They were supposed to be 2D which would mean 12mm or 12 windings (pitch: 1mm). They were more like 10 windings and maybe 10.5 once they were installed - I'll call them 1.75D and move on :) They'll definitely hold and are better than the short ones. Let's see if I get the cams back in without having to put in a couple more...

Got the new coil brackets last week, just need to weld some nuts to them and give them a coat of paint. Also got the control housings ready for the clear coat but the temps have dropped here so I'll have to put off any painting for a few days.





1980 KZ750H (kzrider.com/forum/11-projects/612054-kz750h-restoration)
2000 BMW F650GS
2012 Honda Hornet
1993 Mini Cooper :)
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KZ750H Restoration 21 Mar 2020 14:42 #821329

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Need some help on this one. Apparently, the cams have been swapped out on this bike. I can't confirm this as this is the first KZ I've taken apart (first bike for that matter). I checked the cams and they have a capital R (exhaust) and S (intake) stamped on one side and a capital M in a circle as well as R1 stamped on the other side. There are no other discernible markings.
Tried searching for some info but came up empty (or rather, got so many results that I can't find what I'm looking for). Can anyone identify the cams for me?



1980 KZ750H (kzrider.com/forum/11-projects/612054-kz750h-restoration)
2000 BMW F650GS
2012 Honda Hornet
1993 Mini Cooper :)
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KZ750H Restoration 21 Mar 2020 15:35 #821336

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Usually the R1 cams are Kawasaki and come from the GPZ models but they don't have the tach drive and the R1 is not stamped like the one's you have.
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KZ750H Restoration 21 Mar 2020 16:22 #821342

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Thanks. I did see some Z 750 GT cams on ebay with R1 (intake) and R2 (exhaust) stamped in the same way as mine. These had the tach drive (didn't know the GPz had an electronic tach). Leads me to believe that these cams have been pilfered from another 750 model.
1980 KZ750H (kzrider.com/forum/11-projects/612054-kz750h-restoration)
2000 BMW F650GS
2012 Honda Hornet
1993 Mini Cooper :)

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KZ750H Restoration 21 Mar 2020 20:45 #821371

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Really nice job on the handle bar control housings.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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KZ750H Restoration 22 Mar 2020 02:14 #821380

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Thanks Mikaw, could never have got them looking like that without yours and asphalt900's tips!
1980 KZ750H (kzrider.com/forum/11-projects/612054-kz750h-restoration)
2000 BMW F650GS
2012 Honda Hornet
1993 Mini Cooper :)

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KZ750H Restoration 22 Mar 2020 09:32 #821401

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Thanks Mikaw, could never have got them looking like that without yours and asphalt900's tips!


Kidkawie was my inspiration to try it. Thanks for the kind words but I would not have tried it without his original post.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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