1977 kz 650sr gsxr/z1-900

Two years ago I bought my 77 650 sr did a garage cafe build learned a lot in my journey from cleaning carbs synching carne playing with settings on carbs and trouble shooting electrical issues fixing calipers many teachers along the way and for that I thank you for your knowledge and advice at this time I decided to do the big build to be totally un original let's call it project "the ton" bought a 1995 gsxr 750 that had all the parts I needed to do full front and rear swap and picked up a Z1-900 and this will be my power plant and going to use a 4 into one jardine racing exhaust I will add comments on what I have learned and answer questions as this epic journey continues will add pics of my own soon

Looking forward to it.

Show us a picture of the "Z1-900" we would like to see if it really is a Z1 since that would be a valuable machine but if the engine is ripped out and put in a KZ650 frame the value of the Z1 would be greatly diminished and have you considered the modifications necessary to the KZ650 frame since a large displacement engine can be installed but it will require changes that should not be attempted without the person doing the mods having a solid understanding of the engineering of motorcycle frame dynamics and I don't say this to be negative simply because I like KZ650 bike since I have owned one since 1977 as I have seen at least one big engined KZ650 that looks like it was done very professionally and with good results but also keep in mind that the gsxr front forks and rear swingarm will no doubt change the bike's geometry which will affect the bike's handling to some degree so have you considered mapping the geometry of the modified bike to that of the original to determine what the overall affect on handling will be or maybe it doesn't matter if you are more interested in simply fiddling with and displaying the finished product rather than riding it and it seems odd to call the project "the ton" since the stock KZ650 will very easily exceed the ton that is 100 mph without any mods at all so maybe a better title for the project would be Frankensaki

Might be mistaken, but am vaguely recalling that 900 engine in 650 frame requires engine removal to adjust valves.

Good Fortune!

Is this even possible? Will a 650 frame be able to deal with the extra forces produced by a 900 engine??

Found this one former thread. There might be others.

www.kzrider.com/forum/5-chassis/503534-k...nto-750-frame#503534

Good Fortune!

zed1015 wrote: Yes! It's been done plenty of times.
Z9/1000 and gpz11 are taller but will squeeze into the 650 and 750 frames.
You will have to make new motor mounts though and the cam cover will run very close to the bottom of the fuel tank.

www.kzrider.com/forum/2-engine/462514-engine-fitment#462517

Mcdroid wrote: A consideration....the Z1/Z900/Z1000 shoehorned into a KZ650 frame has been done...however, the issue has been that the motor must be pulled in order to check/change the valve shims...really.

porchev914 wrote: I'm a big fan of shoe horning big engines into small chassis. I hope you pull it off Be sure to start a project thread for it when you start. As long as it's not a daily driver that racks up a ton of miles, pulling the engine to check the valves is a small price to pay for a unique custom bike.

www.kzrider.com/forum/2-engine/394901-sw...kz650-chassis#394942

Bluemeanie wrote: Mcdroid wrote:

Yeah, I've seen that bike too and I think photos are buried somewhere on this site

I believe this is the photo in question... (Z1 in a 650 frame)

www.kzrider.com/forum/5-chassis/351790-9...sisconversion#351805

rstnick wrote: Here are some big engines in kz650 chasis:
1327 cc kz650:

GPz 1100 kz650:

1000 cc kz650:

www.kzrider.com/forum/2-engine/335184-11...z-in-kz-frame#335258


Another related thread:
www.kzrider.com/forum/5-chassis/229157-k...or-in-a-kz650#229470

Good Fortune!

The Z1-900 was purchased with out a frame needs to be rebuilt so far I purchased and installed a set of all balls racing Bearing conversion set only problem I had was length ongoing the stem by 1/2 inch this was done my cutting it in half slugging it and rewelding it together had a custom spacer made and counter bored the head nut to fit inside hole in bottom of top triple and dropped the fork cylinders 1/4 inch as for frame Horizontal brace was replaced (the one center stand is attached to after rear of frame was stretched to 9 1/16 wide to accept the gsxr rear swing arm and a 1x1.5 thick walled rectangle tube replaced it and a second one above it both will serve dual purpose as rear engine mounts and mounts for mono shock mounts had six bushings turned drilled and Welded and custom brackets made for mounting motor front of frame stretched 2 inches to fit motor inside of frame and extra support just below exhaust outlets in head and the only mod done to the rear ended was a 9/ 1/16 long bushing with od of swing arm bushing and Id to match original swing arm bolt and will run an off set sprocket to line chain up so motor can be centered

en.wikipedia.org/wiki/Punctuation

Day one

Google slattenpatte. 650ed

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