700cc 5 Valve!?

Hey what's up Guy's, has anyone ever seen the 700cc 5 Valve from the mid 80's Swapped into an earlier 750 Maxim Frame? Became Curious when I noticed the Transmission Housing for the 5 Valve 700 seemed very similar to that of the YICS 750. It appears that it would bolt right in from looking at Pictures. Has anyone ever seen this done, or possibly done it themselves?

 

One potential issue I noticed is that the 700 is Water Cooled, so a Home for the Radiator would need to be located. But I wouldn't think that would be a deal breaker..

 

Not too sure if the 700 engine will match up with the frame mounting locations? If I recall the 7oo X bike is a smaller bike and lower seating style than the 750 Maxim frame. We will have to see what some of the more knowledgeable folks here have to say. I don't know if the distance on the output shaft drive is the same? Could be just a fast swap. I just put a Seca engine into a Maxim frame and had to so some mods.

 

Not a Maxim but I have a 650 Seca with 911 cc 5-valve liquid.
Since there's already a 5-valve Maxim I see no point in making one yourself.
I had the bike & sidecar combo and found the 650 needed more power to pull the chair.
It was a silly undertaking but no regrets now, I have something unique and it will be with me until I die.

 

Man, that's a really well done Bike. The SECA X is a very nice touch. And our Bike's would be somewhat different, are you sure there's not enough room in the World for a 5 Valve Maxim with Significantly inferior build quality? Lol..

 

But honestly I haven't committed to anything at this point, I have no issue with the YICS 750 it currently has. Just seemed like a cool project to take on one day..

 

The biggest issue with converting an 82 (Maxim or Seca, doesn't matter) to liquid cooling is there is no room for the fan.
If you look at the Maxim-X frame the down tubes coming from the steering neck are more widely spaced to allow placement of a fan there.
My solution was to mount a 2nd rad w/fan between the bike and sidecar, not an option on a solo bike.

Also the Maxim-X has a removable frame section which eases motor installation.
I remove the valve cover to get the motor in/out, that provides just enough clearance.

 

If you want to see a Rad bike with the same motor... https://en.wikipedia.org/wiki/Yamaha_FZX750 . I still lust after this bike, lol. Good luck fitting that one in though, where the motor angle is not nearly as vertical.

 

That is the original Fazer. There are listers here with them @hogfiddles and @xHondaHack I think both have them.
I agree they are very cool. The motor is essentially no different than the FZ750.
Not only is it leaned forward it's also chain drive.

 

Not sure how many "hogfiddles" has, but I do have one custom build that is still in the works:


and one that I did another frame up build on that I sold last summer:

BTW, the ones for the US markets were downsized "tariff beaters" to 700cc, just like the Maxim X.

So while engine swaps can be done (like Simmys awesome SecaX), thinking of the end result, and how to get there, may lead you to just choose a different model like a Maxim X or Fazer700.

Tony

 

That is a sharp looking bike....wow. Would like to have one in my stable.

 

Yes, I noticed the 700 Frame appears to be bigger

Yeah, I've never seen the 700 Frame 1st hand, just Pics online.

Yeah, I've never seen a 700 Frame in Person. But it appeared to have more Rake and a wider Wheelbase then the 750 in Pics Online. But, I didn't notice a Fan either. I wonder if I could find an Aftermarket Piece with a slimmer Profile that I could squeeze in there. It looks like I have a good 8" of space to work with.. I'll definitely have to get Creative..

 

Maybe see about a more Modern Radiatior, with dementions a little better suited for the 750 Frame.
If there's a will there's a way..

 

What got my attention is the Transmission's are identical. At least the Caseing is, so in theory it should mount right up. And yeah the Frames are different, the 700 seems to be more Cruiser inspired, not sure about Phisical Size, but I know the 700 has more Rake and a Wider Wheelbase. My guess would be to help keep the front wheel down.

 

But I would be Surprised if the 700 is Smaller, my CB-750 Dwarf's my XJ, but that's probably my favorite thing about the XJ. I like the short wheelbase, gives it a nimble feel I haven't found in too many Bikes .

 

I believe that Engine is shared with the FZ-750. Very similar Concept but different Transmission, and I believe the Head and Piston's are leaned forward at a more aggressive angle then the Power plant found in the XJ's.

 

Still a pretty sweet Bike that I've definitely never seen before..

 

The Fazer700 did have it's engine based on the FZ750. Destroked to 48mm to yield 698cc so that Yamaha undercut the tariff back in the day.
Fun fact: Yamaha downsized the FZ750 to 700 in 1987 to attempt to boost sales. Didn't work so they went back to a 750 in 1988.
BTW, they have identical 6 speeds transmissions, just different sprocket and tire sizes.

With the forward lean angle of the engine being 45 degrees (way more than the Maxim X has) it really helps lower the center of gravity.
And, even though the Fazer700 has a fairly long wheelbase, it has a "flickable" feel like a sportbike.

Tony

 

I only have 1 fazer 700.........

 

So what wheels did the modded fazer have? I'm guessing xj600s? The 900s were shafties...

 

Are the shock absorbers without visible springs Yamaha parts?

 

The modded one has 1994 FZR1000 wheels. 17" front and rear with 120 and 180 width tires.
Stock set up is 16" front and 15" rear with 110 and 140 width tires.

One of these days I'll be doing a full thread on the build.

Tony

 

Yes the shocks are "upside down" with spring covers. Unique to the Fazer700 (FZX) models.

Tony

 

I wonder if they would fit the 900f?

 

Hard to find a good pair to try. Plus they only have a preload adjustment and much better shocks are available that should fit your bike.

A lot easier to swap, compared to the Maxim X engine swap that this thread started as.

Tony

 

I will look for a set of non factory shocks for my bike. There are also some covers available for the springs. A shop over here does them for old British bikes.