Not a problem area for a stock engine, but for the brave souls going for bigger power its a small difference that might prevent the rod from creating additional crankcase breathing.
interesting, so its a secondary pump system just for the cooler. Very tidy bike as well. I see you have it badged as a 865, what pistons are you running? other engine mods? I’m in the middle of a big bore build myself. Nice work. thanks for sharing.
Hi Chris. I’m interested in your oil pump setup, are you bypassing the filter? Can you elaborate or show some photos? The last engine I built I had a miss-shift and violent over rev resulting in oil pump cavitation and ended up with rod knock shortly after. I have been considering running a stand-alone electric oil pump to avoid this in the future.
-Gizburn, its a custom ignition cover I designed and cast myself.if you want to see my complete documented build you can find it here> https://kzrider.com/forum/11-projects/598240-saving-a-1980-750-twin?start=0
the casting process starts on page 22
Here are some pics from my ongoing 906cc engine build with custom JE pistons and…[Read more]
Doctorot replied to the topic One time chance for big bore kit for KZ750 twin – 906cc pistons and sleeves in the forum The Trading Post 1 year, 6 months ago
Hey Michael, I sent you an email and never heard back. Maybe it went in your spam?
Doctorot started the topic One time chance for big bore kit for KZ750 twin – 906cc pistons and sleeves in the forum The Trading Post 1 year, 7 months ago
I am having custom JE pistons made to <b>86mm bore – 8mm over stock</b>. This will bring displacement to 906cc.
The pistons will be designed for around 9/1 compression with the stock head or, as in my case, if you deck the head you can bring compression up to around 10.5/1 for use with bigger cams. JE is also including several features on the…[Read more]
thanks for that link, very cool build for sure. i wish google translate worked on handwritten text as it looks like there is a ton of info there. I haven’t been able to find what his static compression was, are you aware if he has written it in the notes?
thanks for sharing
Wow, great build!
So many questions as I am in the process of doing my own 906cc engine! Sorry if it seems overwhelming but its cool to see someone else hot rodding these engines.
The “dry block” – because you are bypassing the oil jets between the cylinder and the head how do you increase oil pressure after the crankcase to the head?
Have you…[Read more]
Its been too long since I checked out this website, kinda forgot about it for no particular reason, but I’m back baby!
I thought I would share some pics of my ongoing twin project. Its got a bunch of one-off parts, most of which I made myself. In its most recent iteration, the engine was setup with custom cams, port and polish, decked head,…[Read more]
Thanks for the welcome guys.
I have been in touch with Arias pistons and without sending in my exact requirements they said it would be around $160 USD per piston with a minimum order of 4, discounts for more. That is not bad at all, and I think I may be pursuing this as an option. After reading through Michael’s big bore thread I found the link…[Read more]
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