Gs750 engine dimension

[jb]

Could someone please do me a big favour and measure the distance between the front and back top engine mounting points on a gs750 engine….ideally it’s easier if the engine is out of the bike so you can use some round bar pushed inside the mounts to get a fairly accurate between centers measurement for me……cheers 

[jb]

The reason behind the question is that I’m trying to confirm what engine fits in a special frame that I’ve recently acquired……

 

[gorbys]

I can check next week if no one else can do it before then. Send me a PM if so

[jb]

8 hours ago, gorbys said:

I can check next week if no one else can do it before then. 

Thanks pal…..next week will be great cheers 

[Dezza]

Interesting: what make frame is it?

[clivegto]

33 minutes ago, Dezza said:

Interesting: what make frame is it?

Spondon 

[Dezza]

3 hours ago, clivegto said:

Spondon 

More pics are clearly required

 

If the frame number is still readable, then Rory at GIA can ask Stuart Tiller to look it up. Apparently he still has a load of documentation from the old Spondon works.

Edited March 2, 2023 by Dezza

[Swiss Toni]

Just had a measure. 215mm, lower rear to lower middle mount  … a bit awkward using one hand for each!

Upper rear to front is 402mm give or take a mil. You can just see the front engine bolt below the tape.  

That’s from a ‘78 750 2valve. I would imagine the later 4 valve TSCC cases are the same dimms? Don’t know. Just guessing  

 

Edited March 2, 2023 by Swiss Toni

[jb]

4 hours ago, Swiss Toni said:

Just had a measure. 215mm, lower rear to lower middle mount  … a bit awkward using one hand for each!

Upper rear to front is 402mm give or take a mil. You can just see the front engine bolt below the tape.  

That’s from a ‘78 750 2valve. I would imagine the later 4 valve TSCC cases are the same dimms? Don’t know. Just guessing  

 

Thanks mate….it’s the upper rear to front that’s critical, and judging by your measurement it’s a little too big for my frame….much appreciated, but it’s back to the drawing board 

[jb]

5 hours ago, Dezza said:

More pics are clearly required

 

If the frame number is still readable, then Rory at GIA can ask Stuart Tiller to look it up. Apparently he still has a load of documentation from the old Spondon works.

Yes I believe so mate, unfortunately I’m missing the frame number…..as it’s a quite early frame I was hopeful that the engine choice would have been minimal but it may not be for a Suzuki after all, I’ve tried a gs1000 engine and it fits snugly, but is 10mm too short for the mounting points 

[clivegto]

JB I've discovered recently that my one originally had a GS1000 motor fitted. Also around that time quite a few had Jota motors fitted. I have a 1100et motor I could measure if you like.

[jb]

22 minutes ago, clivegto said:

JB I've discovered recently that my one originally had a GS1000 motor fitted. Also around that time quite a few had Jota motors fitted. I have a 1100et motor I could measure if you like.

Yes please, that would be great thanks Clive……

heres a picture showing how I’ve been measuring the mounting points distance (sorry it’s a foreign engine but it’s all I have to hand)

 

[clivegto]

Hear you go bud. First picture is the 1100ET motor second is a Harris Magnum 2 frame that originally had a 1100ET engine fitted. 

[jb]

Is that 375mm between centres mate?

[clivegto]

3 hours ago, jb said:

Is that 375mm between centres mate?

370 I think.

[jb]

17 hours ago, clivegto said:

370 I think.

Cool, thanks for checking it for me mate…..sounds like it’s the same measurement as a gs1000, close but no cigar.  

[gorbys]

On 3/2/2023 at 1:56 PM, Swiss Toni said:

That’s from a ‘78 750 2valve. I would imagine the later 4 valve TSCC cases are the same dimms? Don’t know. Just guessing  

Later engines are shorter front to back. I went from a 2valve gs engine to a 4valve gsx and had to make new longer engine mounts for the rear so it would bolt into the gs frame