Suzuki GSX650F Forum - www.GSX650F.biz

I've had this idea for awhile, nothing more than a thought for now, just curious to see what you guys think as far as it being possible. Anyone telling me to just buy a new bike will be ignored. That being said, here it is...

I am currently swapping a VG30DETT and 5 speed manual into my 93 non-turbo automatic 300ZX. This has gotten me thinking about the GSXF. If understand this correctly we have the same block as the GSXR and the same trans. I understand we probably have different gearing and our motor is detuned. Its very easy to get a hold of a wrecked GSXR around here due to the number of military that ride here at Fort Hood. I'm debating on swapping a 750 or 1000cc into my GSXF frame. Some questions I have, will our frame handle the added weight, will the stock trans bolt up or should I use the GSXR trans, will the block bolt to our stock mounting positions? I know that I will have to rip the stock wiring out and the stock ecu, but those will come with the totaled bike. I will have to modify the front fairing because on the GSXR there are air ducts behind the mesh.

Yes, I know its a lot of work. Yes, I know it would be easier to buy a different bike. I don't want opinions on whether I should do it or not, I want opinions on whether it is possible or if it will work.

Thanks fellas.

The 650F does NOT have the same block as any GSXR. Its not un uprated 600cc or downgraded 750cc engine. Its an engine specifically designed for the Bandit.

The only engine that directly swaps into the frame with only missing 1 mounting point is the 1250cc Bandit engine. It shares the same underblock/crankcase as the 650F.

Getting a GSXR engine in our frame wouldn't be the problem directly. Getting the air intake to work/fit does. Tank shapes from the 650F and racers are completely different and I think there isn't enough room to accommodate the intake of a GSXR but I could be wrong

Ok, I was told it was a detuned GSXR block. Thank you for clarifying. That is why I asked. So the 1250 will bolt in minus one point. I'm assuming that one point can be added (welded) to the frame. Is the trans a direct swap or would the 650 trans hold the power? If I can find a 1250 harness, ecu, and motor I'm sure it will be cheaper than the 1250FA I sat on the other day when I picked up my GSX650 from the shop for the recall repair. I love the riding position of this bike. I've rode an R6, and a GSXR 600. I can't lean over the tank because it kills my lower back. Does anyone know if this has been attempted before?

The gearing is totally different for the 650/1250. For instance, in 6th gear the 1250 does 50% LESS rpm then the 650F.

Also has to do with the sprockets.
650: 15/48
1250: 18/43

The mounting point it misses is a integrate part of the steel frame that you also need to remove if you want to remove the engine from the bike. But from the looks of it it cant be bought separately.

Sounds like its possible, but I'm beginning to wonder if its worth it. Only way would be to find a totaled 1250 and swap everything over but those aren't nearly as easy to find as the GSXR. I need to go back and look at the 1250FA I sat on the other day to get an idea of where the extra mounting point is.

Here are pictures where I highlighted to mounting points. If you look closely to the crankcase of the 650F you will see the same mounting holes in them.
Sorry for the big size, forgot to resize them!

The spot on the left side where the shifter mounts is on the 650 frame, but the mounting point on the other side isn't there. Where it bolts is removable from the frame itself so if I could get that bar from a wrecked bandit and its in good condition I could just swap those out. Looking at the rest of the bike I'm wondering about the cooling system now too. I think I read we have the same radiator as the 1250 but can't remember off the top of my head. Also assuming the header and exhaust is larger (bigger diameter) would I still be able to use my stock fairings? Of course an oil cooler would also have to be used.

Well if you've payed close attention to the 1250FA you could have noticed the bigger gaps in the fairing to allow heat to dissipate. Also the 1250FA has a second fan to help for cooling.
Radiator is the same for both 650 as the 1250 engine. Exhaust is not the same because the 1250FA uses the stainless/chrome exhaust from the 1250. But the general conclusion is that the stock exhaust should fit the 1250 engine. But I cant confirm this.

There could be 1 more obstacle in your path. The aligned of the front and rear sprocket. Because the 1250 has a wider rear tire (180vs160) it has a wider rim and different swingarm and so the sprocket is not aligned should you replace the rear swingarm/wheel as well. If you're not planning to get the swingarm I suggest getting at least a proper/stickier tire to the rear to accommodate the difference in contact patch for better rubber.