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Bigger engine for 85 GS550E? What will fit?

  • Thread starter Thread starter bobbysick
  • Start date Start date
B

bobbysick

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I am looking to fit a larger engine (preferably a GSXR or Katana model) into my 1985 GS550E frame. What will fit is the question???

I am willing to go the extra route of steering stabilizers and reinforcing the frame, even as far as to reweld the mounting brackets...anybody have any ideas or expperience behind this situation?
 
the GSXR600 motor has a chance.. But it isn't likely. There's a lot of power available if you're willing to go the route of a 4-1, pods, and a stage 3 dynojet kit. If that's not enough, yoshimura made cams too.
 
Don't know about any '85, but I just finished bolting up a late 80's GSXR 750 into my '78 GS550. Like I said, don't know about the '85 model, but if it would any help, the newer engines will fit in the older frames with a little work.

let me know if you want or need any addition info.

cm:-D
 
This the start of my project. Should be ready to ride by Spring. Currently it is tore down getting the frame braced and welded and I will start putting it back together as time allows.

The engine fit right in (had to make mounts of course). It is actually smaller in every deminsion (except across the top of the head) than the older GS550 engine. Plus about 40lbs lighter. Only major issue was the carbs. Had to relieve the edge of the gas tank to get it to set down (it will be cut for knee pockets anyway). Of course I had to get creative with the airfilter mounting, but it should work out.

Let me know if you have any specific questions,

later,
cm
 
DAMN YOU! Now I know what I need to do. Now that I've gone 650.. it's time to go 600. *shakes his fist* RAAAR!
 
See, I bought a ragged out GSXR that had a bad engine (one missing piston and rod because it spun a rod bearing and proceeded to disintegrate the piston). I was only going to use the front end and wheels from the bike. One thing led to another and an engine rebuild later this is what I came up with. Just wanted a neat little run around bike that might run and handle fairly well. The engine swap was an after thought. Considering how lite the bike will be, it should be a pretty spirited little ride. I will also be running a cafe style tail section and the rear of the bike will be approximatly 2" taller after I make the shock mounts and get the ZRX shocks on there.

The original question was whether a later model engine would fit in an '85? If the frames are similar to the '78 as far as mounts, I would see no reason why it wouldn't. The way my mounts are made and given the nature of suzuki, I could put a GSXR 1100 or a Bandit 1200 engine in there with no more modifications. The way I am bracing the frame, it should handle it. One more note, the only engine mount that had to be cut off the frame was the bottem left mount. All the other mounts lined up with just a few spacers and a few different brackets. I also need about a 1/16th of an inch more chain clearance, but that can be taken care of with a little imagination.[-o<

cm
 
Well, how about an 8-valve GS750 motor? I have an '80 GS550E.
 
If the 600 fits then a 750 will probably fit too. The old 600's were supposedly the same size physically as the 750. An old member was attempting it here but I don't think he ever finish before being killed in an auto accident.
 
cm113 said:
This the start of my project. Should be ready to ride by Spring. Currently it is tore down getting the frame braced and welded and I will start putting it back together as time allows.

The engine fit right in (had to make mounts of course). It is actually smaller in every deminsion (except across the top of the head) than the older GS550 engine. Plus about 40lbs lighter. Only major issue was the carbs. Had to relieve the edge of the gas tank to get it to set down (it will be cut for knee pockets anyway). Of course I had to get creative with the airfilter mounting, but it should work out.

Let me know if you have any specific questions,

later,
cm
Click to expand...

That looks like a good start on a cool little hotrod!
 
GSXR 750 engine in a GS 550:

mk4_002s_001.jpg


Check out this thread: http://oldskoolsuzuki.info/cgi-bin/Yabb/YaBB.pl?num=1049597189
 
Deesel said:
That looks like a good start on a cool little hotrod!
Click to expand...

Thanks,
Currently the frame is ready to be powder coated and then I can start putting it together and finishing it. Hope to have it done by summer of next year.

For the record, the engine I am using is a 750. Don't know if I ever said that or not
 
I have always thought this would be a cool swap, the tricky part if I remember correctly is having enough room for the carbs, that is why 2 barrels were used originally.
 
Hi Guys have just found this thread and I'm glad I have. I was thinking on putting my GSX750 engine into a GS750 frame which I have just bought, and it looks from this thread as if it will fit:-D Cm113 if i can ask, you mentioned you had put additional bracing on the frame, if you did could you give more details please, it would be much appreciated, also did you weld on other mounting points. I'm going to try and build a real cafe racer style bike.Thanks!
 
As far as putting the engine in the frame, there are no additional mounts or braces needed. I used all the stock mounting locations from the frame and made brackets/spacers to mount to the new engine. You would be suprised at how similar these engines are once you started measuring. Plus the weight savings is incredible. I can place and pull the late model 750 engine by my self. However, I can't pick up the GS550 engine without serious problems with the old back:-|

Mine will also be a cafe styled bike when completed. So I want it to handle as well as possible. That is why a braced the frame (added gussets, etc.) Anywhere that looked like there would be stress, I added a brace (if I had room). All this braceing should help the chassis feel alittle more planted when the speed goes up. Plus, my 550 frame was built with the idea that a 40+ hp engine would be setting in it. I figure if I more than double the hp, the frame would need some extra bracing to stiffen it up.

You have alittle bit a room once the engine is in the frame. So you can place the engine in crooked if your not careful. Basically it comes down to getting the engine position that allows for the sprockets to be aligned, the header to fit and the gas to clear as best it can. Yes, there is some problems getting the carbs to fit on with a stock tank. My tank will modified for knee pockets anyway so that won't be a problem. From the pictures of the other bike on this thread, it appears that type of tank my have more clearance than the one I am using? One other thing, on the 550 frame, I have to pull the oil pan to get the 750 engine in or out of the frame. Since you don't pull the engine very often, this is not a problem either.

hope some of this helps.
cm
 
Yes it helps a lot. Much appreciated. I have a GSX750F and I'm planning on transfering the engine and front end to the GS750b frame, I know there's a bottom head stock bearing change required, also have a katana twin shock swing arm which will fit, and I'm going to flip the clip ons and get them machined, so it has the distinctive low handle bars, thats the plan any way :-D no doubt it will have changes along the way. Thanks again for the info.
 
Actually, If I am not mistaken, the GS750 used the big bearing on the bottem of the steering stem. If so, that is the same bearing your GSX750F uses. Should be a direct bolt up and go swap. I could be wrong?

later,
cm
 
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