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Author Topic: saving a 1980 KZ750 twin  (Read 62184 times)

Offline doc_rot

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Re: saving a 1980 KZ750 twin
« Reply #170 on: Jul 18, 2016, 01:36:27 »
I ordered some bends from Cone Engineering and was kinda disappointed in the quality. Not much better than my crushed sand bent radius. and they had creases on the outside of the bend. The first bend of the header is very visible so I bought some bends from Colombia Mandrel and the quality was much nicer and 7 bucks cheaper a piece to boot!

My buddy Eric thought 2" would be too big for the collector so I dropped that down to 1.875". This meant there were no cheap collectors to be bought so i had a go at making my own.

I hammered open the ends of the primaries and then faced them on the disk sander before welding them together to try and keep stress out of the welds. It still took a good amount of bashing after to get it to fit up.I also ovaled the big tube slightly to help out the transition. I was super shaky welding this up for some reason so the welds arent my best, I probably should have done some practice beads first to get in the groove but you will never see these welds when the pipe is on the bike, so whatever. I also compressed the fork to make sure there would be plenty of clearance. next up is sand bending the second bends.
« Last Edit: Jul 18, 2016, 03:37:34 by doc_rot »

Offline WackoTie

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Re: saving a 1980 KZ750 twin
« Reply #171 on: Jul 18, 2016, 02:11:25 »
Looks great man

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Offline advCo

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Re: saving a 1980 KZ750 twin
« Reply #172 on: Jul 18, 2016, 17:10:28 »
Nice work on the collector. I used a 2-1 collector from cone eng on the 360 headers and they neglected to tell me about the little triangle filler pieces. I ended up welding it to the headers once, removing it and rewarding between the two header pipes from the inside since it was impossible to fill the voids. I'll just make my own next time.


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"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
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Offline doc_rot

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Re: saving a 1980 KZ750 twin
« Reply #173 on: Jul 18, 2016, 22:27:41 »
Thanks guys

Offline doc_rot

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Re: saving a 1980 KZ750 twin
« Reply #174 on: Jul 20, 2016, 03:22:01 »
Guess they were worried about vibrations.

Offline canyoncarver

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Re: saving a 1980 KZ750 twin
« Reply #175 on: Jul 20, 2016, 12:03:14 »
Ya think?  Lol.   
--

YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
KZ400 The Rabbit
KLR650, 65 Norton, my never finished shovelhead chopper, an 86' FXR, and an F9 Bighorn
more YZF750R's, more KZ's, a Zephyr750...and the ever unfinished 75' CB550 cafe.
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Offline jpmobius

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Re: saving a 1980 KZ750 twin
« Reply #176 on: Jul 20, 2016, 12:13:09 »
Very important for the battery!  (somewhat less so for some of the new tech batteries)  Be glad you have all the bits - some are a pain to find and put everything back proper!
Mobius


On a long enough timeline, the survival rate for everyone drops to zero.

1973 RD350 Yamaha build  http://www.dotheton.com/forum/index.php?topic=66498.0

Offline advCo

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Re: saving a 1980 KZ750 twin
« Reply #177 on: Jul 20, 2016, 13:16:45 »
Guess they were worried about vibrations.

Try soaking those rubber bits in DOT3 brake fluid overnight. I had some pretty good results on the XL rubber parts. It doesn't make them look new but it gives them back some of their flexibility.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline jpmobius

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Re: saving a 1980 KZ750 twin
« Reply #178 on: Jul 20, 2016, 14:43:08 »
good idea, but have a care.  Soaking any rubber parts in brake fluid (methyl salicylate (wintergreen oil) and acetone is better) can do wonders, but pretty easy to overdo, so keep a close eye on how long you soak.  Some parts can seem fairly immune, but some can expand and become ruined unexpectedly.  Methyl salicylate is better IMHO and does not eat paint like brake fluid.  Go cart guys use it to prep their tires so check out cart suppliers if you want some.  Can also be had at drug stores slightly altered and way more expensive but it still works.
Mobius


On a long enough timeline, the survival rate for everyone drops to zero.

1973 RD350 Yamaha build  http://www.dotheton.com/forum/index.php?topic=66498.0

Offline doc_rot

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Re: saving a 1980 KZ750 twin
« Reply #179 on: Jul 20, 2016, 16:53:39 »
I have used wintergreen oil on carb boots before and it works pretty good. Only the 4 bushings that hold the battery to the frame are in bad shape and they are still available from Kawasaki for a little over a dollar a piece. I looked up the bikes that use these bushings and its well over 100 models all the way to 2016. guess Kawasaki got their moneys worth out of those molds.