Engine Swap question (650 in a kz750)

thereisntanyone · 09-15-2007

I have a 1976 KZ750 twin. It runs but it's pretty rough. I have the opportunity to buy a 650, including carbs and tranny, for $100. I have no idea what shape it's in, but I was thinking of getting the 650 and doing a complete rebuild and then sticking the 650 on my frame. Will it fit on the frame, and what kind of parts compatibility am I looking at? Are the trannies interchangeable?

My thinking is that I'd rather keep the bike operational so I can continue riding and learning, and then once I complete the engine rebuild I can switch it in so I have a nicely freshened up 4 cylinder.

elr658 · 09-16-2007

No No No No!!!!

A2rider · 09-16-2007

Now that that has been answered, can you put a 900 motor in a 650 frame?

D-Day · 09-16-2007

Quote:

Originally Posted by A2rider

Now that that has been answered, can you put a 900 motor in a 650 frame?

That's my kind of question.

elr658 · 09-16-2007

It has been done.

A2rider · 09-16-2007

Quote:

Originally Posted by D-Day

That's my kind of question.

I asked that because I have a hole in the front of my case with a connecting rod sticking out of it

E.Diane · 09-16-2007

Quote:

Originally Posted by A2rider

I asked that because I have a hole in the front of my case with a connecting rod sticking out of it

This didn't just happen did it or is this another motor you have just sitting around? If this is a new CCV (Complete Crankcase Ventilation) hole, man, you have bad luck.

A2rider · 09-16-2007

Quote:

Originally Posted by E.Diane

This didn't just happen did it or is this another motor you have just sitting around? If this is a new CCV (Complete Crankcase Ventilation) hole, man, you have bad luck.

Luck is something other people have! Yes, it's true, I will take some pics today.

I was riding to work Friday, and knew immediately that I had lost a cylinder. Got it stopped, looked up front, and it was leaking oil from the hole. Then the oil started on fire! I tried to put the small fire out, but only managed to burn my hand on the exhaust.

So I have a winter project, either that or I give up!

E.Diane · 09-16-2007

Oh man! Look for the bright spots...at least it didn't oil the back tire and put you down. Sorry for your misfortunes.

A2rider · 09-16-2007

Quote:

Originally Posted by E.Diane

Oh man! Look for the bright spots...at least it didn't oil the back tire and put you down. Sorry for your misfortunes.

Yep. Thats the first thing that went thru my mind, "Please don't kick me off this time!".

09-15-2007	#1 (permalink)
thereisntanyone Newbie Join Date: Sep 2007 Posts: 1	Engine Swap question (650 in a kz750) I have a 1976 KZ750 twin. It runs but it's pretty rough. I have the opportunity to buy a 650, including carbs and tranny, for $100. I have no idea what shape it's in, but I was thinking of getting the 650 and doing a complete rebuild and then sticking the 650 on my frame. Will it fit on the frame, and what kind of parts compatibility am I looking at? Are the trannies interchangeable? My thinking is that I'd rather keep the bike operational so I can continue riding and learning, and then once I complete the engine rebuild I can switch it in so I have a nicely freshened up 4 cylinder.

09-16-2007	#2 (permalink)
elr658 Eddie Lawson is God! BTK Expert Join Date: Nov 2004 Location: Seymour,CT Posts: 4,653	No No No No!!!! __________________ 1982 Kawasaki KZ1000R1 #658 1983 Honda CB1100F Blue. www.myspace.com/79cb750f

09-16-2007	#5 (permalink)
elr658 Eddie Lawson is God! BTK Expert Join Date: Nov 2004 Location: Seymour,CT Posts: 4,653	It has been done. __________________ 1982 Kawasaki KZ1000R1 #658 1983 Honda CB1100F Blue. www.myspace.com/79cb750f

09-16-2007	#9 (permalink)
E.Diane Sit speling cheker BTK Expert Join Date: Mar 2006 Location: Mesa, Arizona Posts: 427	Oh man! Look for the bright spots...at least it didn't oil the back tire and put you down. Sorry for your misfortunes. __________________ ...Diane '85 ZX900A2 Ninja(modern classic) Mayor & Chief Sanitation Engineer - DooberVille

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09-16-2007	#3 (permalink)
A2rider Banned BTK Expert Join Date: Mar 2006 Location: KCK Posts: 19,728	Now that that has been answered, can you put a 900 motor in a 650 frame?

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