650/750 engine in Z1 frame?

  • Sixten
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650/750 engine in Z1 frame?

Yesterday 08:32
#920574
Hi,

I found a Rickman frame Z1 without engine for sale and i have bunch of Z650/750 engines…

Would it fit with adapters? I don’t want to cut the frame.

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  • MFP-Joe
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Re: 650/750 engine in Z1 frame?

Yesterday 08:39 - Yesterday 09:02
#920575
The "engine conversion specialists" here can certainly tell you that... If I were you, I would get a Z1000 A1 or A2 engine for the Rickman frame (they aren't as expensive as the 900cc Z1 engines, and they fit just like a 900cc engine; the dimensions are exactly the same).........Unless you enjoy challenges and are looking for the fun of remodeling...
 
Greetings, Joe
Last edit: Yesterday 09:02 by MFP-Joe.

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  • sf4t7
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Re: 650/750 engine in Z1 frame?

Yesterday 08:56
#920577
I'm with Joe.  Why not drop in a 1000 - it fits perfectly and you'll have some extra power.  More if you hotrod the 1000 with a little more compression!
Scotty

1974 Z1A
Yoshimura 987, 10.25:1
welded Z1 crank
Andrews 1X Cams
Delkevic 4 into 1
Superbike bars
530 conversion

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  • Injected
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Re: 650/750 engine in Z1 frame?

Yesterday 09:35 - Yesterday 09:42
#920580
I did the exact opposite and put a Z1 engine in a 650 frame without major alterations so I would say yes its probably going to work.

www.kzrider.com/forum/11-projects/618809...00-engine-transplant

If you read thru my build thread all the frame mock up is explained in detail. 

The 650/750 engine is not as tall so there would be extra room at the top of the cam cover. Its much easier to do the mock up with empty cases/head/barrels, that is what I did. For mine I just sat the cases as low as possible then started looking at the motor mount points.
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1978 KZ650B2 Injected Drag 831cc
1980 Z1 Custom Frame Drag 1327cc
1981 Z50R Honda tow bike
Last edit: Yesterday 09:42 by Injected. Reason: more info

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Re: 650/750 engine in Z1 frame?

Yesterday 10:06
#920581
Try and keep as straight a line as possible from the rear axle, through the swingarm pivot to the gearbox sprocket
1982 KZ1000 Ltd
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca
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Re: 650/750 engine in Z1 frame?

Yesterday 12:20
#920586
Yes a 1000 would make sense but to race it it needs to be a Z1 or 650/750 engine.

Can the 650/750 engine be longer because of the extra shaft between the crank and gearbox?
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  • TexasKZ
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Re: 650/750 engine in Z1 frame?

Yesterday 13:31
#920589
What extra shaft?
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24

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Re: 650/750 engine in Z1 frame?

Yesterday 15:38
#920593
The secondary shaft between the crank and gearbox. Chain driven from the crank and drives the clutch basket.
On Z1 engines the clutch basket drives directly on the crank.

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Re: 650/750 engine in Z1 frame?

Yesterday 15:57
#920594
Injected wrote:
I did the exact opposite and put a Z1 engine in a 650 frame without major alterations so I would say yes its probably going to work.

www.kzrider.com/forum/11-projects/618809...00-engine-transplant

If you read thru my build thread all the frame mock up is explained in detail. 

The 650/750 engine is not as tall so there would be extra room at the top of the cam cover. It’s much easier to do the mock up with empty cases/head/barrels, that is what I did. For mine I just sat the cases as low as possible then started looking at the motor mount points.

Thanks. And nice build. 
Looks like the length is similar but like you say I would have more space upwards and could probably rotate the engine to fit.

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Re: 650/750 engine in Z1 frame?

Today 07:50
#920612
I never really put a tape measure on the two different engines, but there did seem to be some difference on the fore aft location of the front sprocket when I went to install the chain.

One tip I do have is to make sure you can slip the sprocket cover on when doing the mock up. On first try my shift shaft was too close to the bottom frame rail to get the cover to install.
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1978 KZ650B2 Injected Drag 831cc
1980 Z1 Custom Frame Drag 1327cc
1981 Z50R Honda tow bike

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Re: 650/750 engine in Z1 frame?

Today 11:38
#920627
Sixten wrote:
Can the 650/750 engine be longer because of the extra shaft between the crank and gearbox?
650/750 engine is smaller/shorter in all directions compared to the 900/1000/1100.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
www.kzrider.com/23-for-sale/611992-air-c...lide-mikunis?start=0





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  • StreetfighterKz
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Re: 650/750 engine in Z1 frame?

Today 13:30
#920630
Setting dimensions and required fabrication aside, you don’t want to mod the frame yet what will happen to it if you crash while racing it?  It’s most likely not going to come out undamaged.

Just something to think about…my 2¢.

Later, Doug
1978 z1000 Streetfighter
1976 z900 Stripfighter
1978 Z1R (roller)
1979 z650 Resto-Mod
1983 Gpz750 Resto-Mod
2018 Z900RS

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