KZ440-400 swap

This question has most likely been covered many times but Tapatalk is impossible to navigate.

Anyway what exactly are the differences between the 400s and the 440s?

The reason I ask is because I have acquired an '81 KZ440D (LTD) that had a spun con rod bearing. After searching for months have failed to locate the parts I need or a decent replacement motor but have managed to get my hands on a good running 400. I knew enough to get one new enough to have the external oil feed. Running the numbers I believe it's a '79.

Other than the pistons, cylinders and cam gear is there any other differences I need to know about?

Sorry for running on and thanks in advance.

Kick start.

Did you try asking a Kawasaki dealer about the con rod bushing? According to Partzilla the same bushings were used on various Kawasaki models up through 2009, so suspect you will find the bushings are still available. They cost about $7 or $8 each. Ed

If the bearing spun it probably scrored the crank also.
Been thru that ordeal before.


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According to Kawasaki that bearing was only used until '83, hasn't been made since '93 and there hasn't been available for back order in Canada for more then 10yrs.

Partzilla lists them as still available (the only online parts site that did) but when I ordered them I received an Email a few hours later stating they are obsolete.

I found a guy on ebay that had a set but he wanted $50ea. (that's $100 for the complete bearing)

As for the crank, it is marred slightly but I repolished it to a point that is usable but not to be completely trusted. A motor swap is still the best option.

...and being how bearings have to be matched to journals and mains/con rods add to that how impossible it is to track down 1 bearing, replacing and having to find all 6 will take a miracle.

No eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configurationOK; in that case ebay would be a good source. Ed

Here are 6 of one size:








Here are 11 of the other size.









Ed

Ok, a couple of them would fit, (92028-1099)

but being the crank should be replaced as well, that means replacing both sets of con rod bearings and all mains

It's way easier this way.

…so to bring it back to my original question,

Other then the pistons, cylinder jugs and cam gear (along with a kick start) is there any differences between the 400 and the 440 I need to know about?

i.e. spark plugs/gaps, carb jets, CDI etc.

None what so ever.


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Nebr_Rex wrote: None what so ever.


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Thank you, just so no unexpected surprises come up with this swap. I will be obviously keeping the 440 around for a parts motor and future bore increase. After some head work :evil: