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TOPIC: uncles sams 700 vs 750

uncles sams 700 vs 750 04 May 2019 21:56 #803346

  • gixxerkidd03
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hey guy , so i came up on a free 84 KZ700A engine that i will be using at a donor for my current kz750E. My plan is to fully build the kz700 (as a 810cc) that way my bike wont be out of commission for any real period of time . im looking for any major differences between the 84 kz700 and 81 kz750E beside the cylinder bores and cylinder head? and can the kz700 be bored to fit 810 big bore kit or is it recommended to start with the 750 jugs? i will be replacing the cylinder head with the a 750 head for obvious reason.

my goals for the build is to starting with the bottom end is:
~ to do a 6 speed trans mission swap as DaftRusty did complete with zr7 secondary shaft,starter clutch, oil pump, with oil pan and cooler.
~ i will be running an 810cc big bore kit
~kz750 head with milled .010" with mild port , built with new guides and valves
~83-85 GPZ cams that have a .5mm more lift and slotted cam gears

i would appreciate any other information regarding the differences between the two engines or any foreseeable problems i may run into.

thanks guys.

~Eric
1981 KZ750e

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uncles sams 700 vs 750 05 May 2019 13:17 #803368

  • Nessism
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The 700 engine case is set up for rubber mounted engine mounts. I bought a set of the mounts with thoughts of converting those on my 750 but never did the mod out of laziness. PM me if you want to acquire a set of mounts for cheap.

I don't know if the 700 cylinder liners can be bored to 69mm.

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Last edit: by Nessism.

uncles sams 700 vs 750 05 May 2019 14:23 #803370

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ya i received almost a full bike. unfortunately most the parts where in buckets and the buckets were filled with water. so i pull the engine and scrapped just about everything else. the motor mounts are the only other thing i kept haha, i thought they looked like great mounts, unfortunately it looks like only the right one will work. my frame is from a kz750h and the left side of the frame has a weldment.
1981 KZ750e

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uncles sams 700 vs 750 08 May 2019 17:46 #803547

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Anyone else know any major differences with these two engines?
1981 KZ750e

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uncles sams 700 vs 750 08 May 2019 18:43 #803554

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Bore is different. 700 has higher compression. Check part numbers if you want to see what's the same and what's different.
www.partzilla.com/

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uncles sams 700 vs 750 09 May 2019 07:40 #803587

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I learned. 810 is max for 750 when its comes to working for long time....

So if the linners thinkness is the same on 750 and 700, will guess the linners will be to thinn...?

But if the whole for the liners is the same, then you have higher margin to borr out?
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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uncles sams 700 vs 750 11 May 2019 08:48 #803686

  • Jekyll86
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Hi Kidd. I’ve done the 810 kit in a 700 with a GPZ intake cam. I have about 5k miles on it and it seems to work well. I didn’t measure the sleeve thickness so I can’t speak to whether or not the 700 just has more material in the sleeve than the 750 or if it is smaller all around.

The 6 speed trans swap is a really cool mod. I’m wanting to do the same and have been collecting parts but just haven’t torn the bottom end apart to do it.
1984 KZ700A1 Franken-saki
810 kit

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uncles sams 700 vs 750 15 May 2019 15:46 #803933

  • gixxerkidd03
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ya i two have been collecting parts hoping to do the full build at once. good to know you are running 810 in your 700. are your still running a 700 cylinder head? and is there a reason you are only running a gpz intake cam instead of both?
1981 KZ750e

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