Fl250 gsxr engine

[Odysseygsxr]

So I got a gsxr 750 motor and a 1980 fl250 odyssey and would like to make them one. I have questions about the rear axle and maybe I can get some advice.

 

[Kartorbust]

Well what's the question? If it's about the axle holding up to that much power, doubtful for very long. Someone with more knowledge will chime in on what to get.

 

[bob58o]

Go head and ask the questions....

https://oddatv.com/wp-content/uploads/2013/05/FL250-Manual.pdf

 

[itsid]

uhhh a pre 1992 engine...
I hope you plan on a good overhaul first.

chances are it's not in it's best condition

if such beast is spitting enigne internals at you, you will not be safe
I mean we speak of 100-110 horses that will kick your head in worst case, right?

So make sure this thing runs well and can still handle loads before you plan on installing it to your Ody.

I also hope you still have the carbs, finding the correct ones is tricky, since they esentially changed some minor detail every year

Anywhoo..
axle:
most reliable would be to get a nice beefy new axle and simply run a chain instead.
that likely means you will have to machine a sprocket hub to take a matching sprocket.
(530 I guess)

and if you want a differential you are about to be screwed
that thing has at least 70Nm of torque (max 74 or so) and a first gear around 3.4 or something
that turns out to be around 240Nm ..too hefty for non automotive differentials especially
if you keep in mind that it still makes 10k plus of rpm. (~3000 rpm at the diff)

so yeah.. possible, not trivial and very surely not cheap if done correctly.

'sid

 

[Odysseygsxr]

Can I put a gear on the stock axle if so how? I still jave the sprocket from the bike.My motor is good

---------- Post added at 12:18 AM ---------- Previous post was at 12:17 AM ----------

Does any one have a good motor mounting set up?

---------- Post added at 12:20 AM ---------- Previous post was at 12:18 AM ----------

If i need to change my axle what should I use do u think?

 

[bob58o]

Here's a related thread. I didn't read it. Check it out and maybe send bighead a Private Message. He's the Ody guy.
http://www.diygokarts.com/vb/showthread.php?t=14552

 

[Odysseygsxr]

Here's a related thread. I didn't read it. Check it out and maybe send bighead a Private Message. He's the Oddy guy.
http://www.diygokarts.com/vb/showthread.php?t=14552

I had read that one the guy had already cut the back half off of his cart and had no choice but to use A after market axle

 

[bob58o]

Well bighead posted about a day ago so if you can wait, he'll probably stumble upon this soon enough and might be able to offer up some sound advice.

 

[Odysseygsxr]

I sent him a message thank you

 

[landuse]

I don't have any firsthand knowledge of Ody axles, but I am doubting that it could handle that engine for very long before it twists like a pretzel.

 

[Odysseygsxr]

I just wana get it rideable so I can still play a little while I upgrade if I only get 100 miles out of it before it brakes I'd be happy

 

[landuse]

I just wana get it rideable so I can still play a little while I upgrade if I only get 100 miles out of it before it brakes I'd be happy

You might also twist the frame, and that would make things a whole lot more difficult for you to rectify.

 

[Kartorbust]

Also weight will be a problem and you'll have a watercooled engine as well. In all honesty as long as your fabrication skills are good I see 2 options.

1. You build your own frame, I'd suggest 1.25"x1/8" square tubing. Plenty strong and light weight. You can do it to be full suspension and you shouldn't have to worry about twisting a classic frame.

2. You stretch out and reinforce the exiting frame. You'll still have the issue of just relying on balloon tires in the rear as your only rear suspension, which will wear on you over time.

If you the radiator lines end up breaking, you'll end up scolding yourself in hot coolant. If you want to swap a different engine on it, I'd look at maybe a 250cc single cylinder motorcycle, dirt bike or atv engine.

 

[bob58o]

Also weight will be a problem and you'll have a watercooled engine as well.

If itsid was correct, pre '92 engines were not water cooled.

 

[Kartorbust]

If itsid was correct, pre '92 engines were not water cooled.

True. But he never did say what year this one was.

 

[anickode]

True. But he never did say what year this one was.

No, but that looks like an awful lot of fins on the block for a water cooled engine.

 

[Odysseygsxr]

Motor is a 94 (water cooled) I will be building a fire wall I figured I would be re enforcing the frame the rims are shot so I'll be replacing rims and tires

---------- Post added at 08:16 PM ---------- Previous post was at 08:14 PM ----------

Also weight will be a problem and you'll have a watercooled engine as well. In all honesty as long as your fabrication skills are good I see 2 options.

1. You build your own frame, I'd suggest 1.25"x1/8" square tubing. Plenty strong and light weight. You can do it to be full suspension and you shouldn't have to worry about twisting a classic frame.

2. You stretch out and reinforce the exiting frame. You'll still have the issue of just relying on balloon tires in the rear as your only rear suspension, which will wear on you over time.

If you the radiator lines end up breaking, you'll end up scolding yourself in hot coolant. If you want to swap a different engine on it, I'd look at maybe a 250cc single cylinder motorcycle, dirt bike or atv engine.

Do you mean weight in the front end? I've been thing of that myself

 

[Odysseygsxr]

94 gsxr 750

 

[Kartorbust]

Motor is a 94 (water cooled) I will be building a fire wall I figured I would be re enforcing the frame the rims are shot so I'll be replacing rims and tires

---------- Post added at 08:16 PM ---------- Previous post was at 08:14 PM ----------



Do you mean weight in the front end? I've been thing of that myself

A bit of both front and rear. With the added weight in the back, it'll kick up the front end quite easily and if you got that part under control, not enough weight in the front and you won't be able to turn as easily.

If I recall the Fl250 also used a gas and brake handle on the steering yoke, rather than foot pedals, that may add another challenge to putting in a shifter as well as a clutch handle. I'm not trying to discourage you in the build/conversion, I just want to bring up all of the things you'll have to figure out, so you know how to plan everything out a head of time and not be full in to the build and find out all the challenges when you've done 50 or 60% of it and getting frustrated and possibly giving up.

 

[itsid]

Motor is a 94 (water cooled)

*cough* uhm I seriously doubt that.. the 94 and 95 engines had the waterpump sticking out the left side ..
a different rib-pattern on the valve cover
and the cylinder block has an additional bolthole to stiffen the engine in the frame (it's way heavier than previous engines

yours look awfully lot like a 88 engine to me
at best it'd be a 1991!

here a few comparision pics:
'88

'95 (see that additional bolthole?)


here's the headpattern of a '91 engine:

and the pattern of a '94 engine:

94 gsxr 750

Nope still not watercooled.. that is an oil cooler!!

The bike I testdrove a dozen times (but wasn't able to buy in 1994 for lack of funds since I just bought a car that year)

(still love that silver color and the blue upside down fork *sigh*)

Now I call a fuel injected SRAD my own...

not as cool as the 94 silver model, but it was a good deal and it's quicker too


'sid