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Saving a 1980 750 twin.

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Saving a 1980 750 twin. 29 Jul 2019 13:01 #808365

Scirocco Offline Premium Member Never change a running system Posts: 3926 Thank you received: 1899	I would put an oil cooler on the "To-Do-List" first. Bronze bushing the connecting rod for the wrist pin is a must have mod for tuned engines. High Performance engines had and extra oil line (Jet) that spayed oil to the bottom of the piston and wrist pin for cooling and lubrication. My 1975 Z 1 B 900 Project www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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Saving a 1980 750 twin. 29 Jul 2019 13:34 #808366

DoctoRot Topic Author Offline Sustaining Member Oh, the usual... I bowl, I drive around... Posts: 2544 Thank you received: 664	Hmmm, I wonder if it would be possible to make that happen '78 1000 Long Term Project '80 750G 750 Twin Big Bore Track Bike
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Saving a 1980 750 twin. 29 Jul 2019 14:12 #808368

SWest Offline Sustaining Member 10 22 2014 Posts: 22431 Thank you received: 2621	This is for the cam chain in my daughter's car. It sprays in two directions. Steve Z1b1000 1975 Z1b kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882 kzrider.com/forum/2-engine/597654-poser?start=240#704229 Attachments:
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Saving a 1980 750 twin. 29 Jul 2019 16:47 #808378

bluej58 Offline Sustaining Member The chrome don't get you home Posts: 2484 Thank you received: 511	Heavier cross hatching ? 78 KZ1000 A2A
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Saving a 1980 750 twin. 30 Jul 2019 09:41 #808429

DoctoRot Topic Author Offline Sustaining Member Oh, the usual... I bowl, I drive around... Posts: 2544 Thank you received: 664	Some people smarter than I are thinking there may have been detonation. I found a video of the sound it was making. Thoughts? it was only coming from the right side and from the valve cover. '78 1000 Long Term Project '80 750G 750 Twin Big Bore Track Bike
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Saving a 1980 750 twin. 30 Jul 2019 14:19 #808438

bluej58 Offline Sustaining Member The chrome don't get you home Posts: 2484 Thank you received: 511	. 78 KZ1000 A2A
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Saving a 1980 750 twin. 16 Nov 2019 23:44 #814079

DoctoRot Topic Author Offline Sustaining Member Oh, the usual... I bowl, I drive around... Posts: 2544 Thank you received: 664	getting a move on this. I decided to bite the bullet and get some custom JE pistons in 86mm bore. this will put the bike at 906cc. If you would like to get in on a limited run of pistons and sleeves let me know soon as I will be pulling the trigger on this in the near future. Attachment IMG_0820.JPG not found '78 1000 Long Term Project '80 750G 750 Twin Big Bore Track Bike Attachments:
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Saving a 1980 750 twin. 21 Feb 2020 22:51 #819671

DoctoRot Topic Author Offline Sustaining Member Oh, the usual... I bowl, I drive around... Posts: 2544 Thank you received: 664	Think I found the source of the noise... unfortunately this went south so fast it damaged the crank as well '78 1000 Long Term Project '80 750G 750 Twin Big Bore Track Bike Attachments:
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Saving a 1980 750 twin. 22 Feb 2020 04:10 #819678

Nebr_Rex Offline User Posts: 1891 Thank you received: 298	Go back to the post you made on Nov. 11 2018. Looks like the crank had issues from the start. . 2002 ZRX1200R 81 GPz1100 79 KZ1000st daily ride 79 KZ1000mk2 prodject 78 KZ650sr 78 KZ650b 81 KZ750e 80 KZ750ltd 77 KZ400/440 cafe project 76 KZ400/440 Fuel Injected www.dotheton.com/forum/index.php?topic=39120.0 .
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Saving a 1980 750 twin. 22 Feb 2020 08:40 #819689

DoctoRot Topic Author Offline Sustaining Member Oh, the usual... I bowl, I drive around... Posts: 2544 Thank you received: 664	You think that black stuff was a symptom? I checked the crank for all the things listed in the manual and sent it out to be professionally checked. what else can I do? '78 1000 Long Term Project '80 750G 750 Twin Big Bore Track Bike
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Saving a 1980 750 twin. 22 Feb 2020 18:33 #819708

Nebr_Rex Offline User Posts: 1891 Thank you received: 298	Looks to me that one rod journal and the center main journal had been hot before assembly. . 2002 ZRX1200R 81 GPz1100 79 KZ1000st daily ride 79 KZ1000mk2 prodject 78 KZ650sr 78 KZ650b 81 KZ750e 80 KZ750ltd 77 KZ400/440 cafe project 76 KZ400/440 Fuel Injected www.dotheton.com/forum/index.php?topic=39120.0 . Attachments:
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Saving a 1980 750 twin. 23 Feb 2020 02:03 #819720

DoctoRot Topic Author Offline Sustaining Member Oh, the usual... I bowl, I drive around... Posts: 2544 Thank you received: 664	Hmmm that rod journal does look like it got hot. The main bearings all looked OK this time out. it was the opposite rod journal that got burnt up bad this time but both were shot. I’m thinking oil startvation. Gonna check out the oil pump closer. Any other suggestions for the next build? '78 1000 Long Term Project '80 750G 750 Twin Big Bore Track Bike
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