KZ1K'S MOTOR

chris said he built this bike from scratch....i just sent him pics of my bike and motor. he said he will do a compression test on the 900 motor. but if its worth it...ill send the entire bike out to him.....havnt decided yet.




kz1k wrote:

Just for your information, splitting the cases on a Z motor is less complicated than taking the top end off.

TerryK wrote:

Just for you information, splitting the cases on a Z motor is less comprlicated than taking the top end off.

i was told that when you split a case the likelyness of it leaking is high.

kz1k wrote:

TerryK wrote:

Just for you information, splitting the cases on a Z motor is less comprlicated than taking the top end off.

i was told that when you split a case the likelyness of it leaking is high.

Yeah, if you split it where it shouldn't be split. lol

If the comps are good, and you can verify that, I don't think $300 is out of line for a complete Z1 engine. Just don't make any irreversable decisions when emotional. It may be frustrating now, but if you can hang in there. This "little" project will impact your life positively in more ways than one.

Seriously, splitting the cases IS simpler than removing the top end, but I think a compete resurected engine would be best for your sanity Joe

porchev914 wrote:

If the comps are good, and you can verify that, I don't think $300 is out of line for a complete Z1 engine. Just don't make any irreversable decisions when emotional. It may be frustrating now, but if you can hang in there. This "little" project will impact your life positively in more ways than one.

what makes it a Z1?

waiting on the #'s from chris.

I believe all the 900 (903cc) motors were the same. A Z1 motor is a Z1 motor because it came off of a Z1 bike. My Kz900 motor has the same crank, pistons, cylinders, head, etc. There were some minor differences, carbs went from 28mm to 26mm (and I'm told got easier to work with), automatic chain oiler, and a few others beyond just the appearance of the bikes. There's a model history section on this site if you poke around a little.

Honestly, in '74, I don't know if they had separated the Z1 and Kz900. I believe if the engine serial # starts with Z1, then it's at least a Z1 case :laugh: Other than that, the only difference I know of is the crank.

good to know. man i have learned so much just in a week. i got a lot more to learn too. lol

i am still undecieded about cracking the case.....i dont want to just keep taking shit apart when i am waiting to hear about another motor. twiddling thumbs..hehe

porchev914 wrote:

Honestly, in '74, I don't know if they had separated the Z1 and Kz900. I believe if the engine serial # starts with Z1, then it's at least a Z1 case :laugh: Other than that, the only difference I know of is the crank.

Negative - the Kz900 motors all start with similar serials (Z1E). The engines are basically identical, including the crank. Wasn't until the Kz1000 that the crank was beefed up.

Have you read this information(not sure if you've got this before):

www.aperaceparts.com/tech/techkz1000.html