Oil Channel Bypass Lines for Head KZ650/750

I tried to search this one with no luck, but has anyone developed a kit for bypassing the oil channel that goes to the head and routing it through a line? I've seen it on some engines and was wondering what all was involved in doing it. Not that I don't like the oil channel, but it seems like lines would be more consistent, less likely to leak, and add a little more oil cooling to the engine than the channel does.

Thanks,
KC

On mine, the vertical oil channels going up to the head have restrictor orifices in them to keep pressure up and balance the flow. If you bypass the restrictors, pressure would dump and the engine would be screwed. Don't know about yours, but I don't know any advantage to putting in external lines unless you are trying to mount an oil cooler.

If you plan on running a oil cooler, I think these websites have the fittings that will work.

1. www.redlinecycle.com
2. www.americanclassix.com
3. www.kzzone.com
4. www.aperaceparts.com
5. www.scnitzracing.com
6. www.reproductiondecals.com (not sure about this one)
7. www.sudco.com
8. www.dynoman.net

I'm not trying for an oil cooler, I have a gpz cooler I got off ebay. I was more interested in bypassing the oil channel to make sure that I am getting oil pressure up to the cams without worrying about that channel leaking or plugging up. I'll have to wait to tear it down to see what kind of restriction is in the passage and if I can replicate that.

Thanks,
KC

Interested in this one as I have the same thoughts but different reasons why.

In one of my half baked schemes I'd like to place a Gpz top end on a ZR bottom. Since the channel seal areas are different blocking and bypassing may work.

Haven't checked it all out and still just a thought.

What I have noticed interesting is the big bore plumbing for an oil cooler go behind the cylinder to the case. Not having a schematic for these makes it difficult to understand the flow.

Matching the existing orifice would be the paramount part engineering a 750 case to head bypass.

Well there's a couple of restrictions inline. There's a round one under the barrels and a oval one under the head, they both have about the same size bypass hole in them. In the pic you can see the oval ones on the outer edge of the barrels with a o-ring around them.

Mark

These engine have a oil presure(at least on the big 4's) of 2.8 to 3.0 PSI. It a high volume low pressure system due to the roller bearing crank.

The 650/750's don't have roller bottom ends plain lead.

Mark

KawiConvert wrote:

I tried to search this one with no luck, but has anyone developed a kit for bypassing the oil channel that goes to the head and routing it through a line? I've seen it on some engines and was wondering what all was involved in doing it. Not that I don't like the oil channel, but it seems like lines would be more consistent, less likely to leak, and add a little more oil cooling to the engine than the channel does.

Thanks,
KC

Might find this thread of interest.

external oil line

Good Luck!

Thanks for finding that one Patton. A good read.

kzr750r1 wrote:

Thanks for finding that one Patton. A good read.

I'll second that. I thought I had seen something about it before but couldn't find the thread. I really wanted to see what it would take to get it done right.

Greetings all,,last time i posted,i got a warm,friendly welcome,thank u,,i bought an almist new chrome lockhart oil cooler,i got some brilliant advice on how to mount it without using the original frame mount bracket,,using eye bolts,,worked great,perfect,,id still be interested in buying the original bracket,ebay has a cooler listed now with the bracket i want,but im not spending 100 bucks for the cooler to get the frame bracket,,anyway,,my question,,i mounted my lockhart and it looks like i mite have 2 options for running the lines,over top of cam cover,or under the engine,any thoughts? And,,my lockhart came with the external temp bypass valve,,i live in florida,,it rarely gets so cold that id need it,,is there any other reason to install it,,will it prevent oil from draining from the cooler?,,one more,if yall dont mind,,im installing a dyna s ignition,,and ive seen debates on running 93 octane gas,,i run it,,can i advance my timing more? I thank you for any and all advice,,heres wishing u all safe riding,,be careful out there,,way to many inconciderate idiot drivers out there not paying attention,,here in florida,,people dont know how to use turn signals (even bikers) and people love to cruise and jam up the passing lane,,left lane pass,right lane cruise,,pretty simple,,take care everyine