Fl250 gsxr engine

[65ShelbyClone]

That air and oil-cooled 750 was sold here until about 10 years ago. The most common model was the Katana 750. The sprocket on it is probably a 530. I'd try putting a smallish sprocket on the FL250 gearbox. It will probably break and be lot off effort finding out.

Ironically, not being water-cooled adds the complication of routing the oil cooler and having to keep airflow over the cylinders when they're buried behind the seat, fenders, and exhaust.

 

[Kartorbust]

That air and oil-cooled 750 was sold here until about 10 years ago. The most common model was the Katana 750. The sprocket on it is probably a 530. I'd try putting a smallish sprocket on the FL250 gearbox. It will probably break and be lot off effort finding out.

Ironically, not being water-cooled adds the complication of routing the oil cooler and having to keep airflow over the cylinders when they're buried behind the seat, fenders, and exhaust.

Would putting a larger than stock oil cooler help with that? Just asking for the sake of my own curiosity.

 

[Odysseygsxr]

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.

I was going to make a simple petal set up for gas and rear brake and re purpose the levers for clutch and a front brake system. For weight in the front I was going to make some kind of bash bar in the front and some metal front fenders

---------- Post added at 08:09 PM ---------- Previous post was at 08:06 PM ----------

That air and oil-cooled 750 was sold here until about 10 years ago. The most common model was the Katana 750. The sprocket on it is probably a 530. I'd try putting a smallish sprocket on the FL250 gearbox. It will probably break and be lot off effort finding out.

Ironically, not being water-cooled adds the complication of routing the oil cooler and having to keep airflow over the cylinders when they're buried behind the seat, fenders, and exhaust.

The gear box that is on the rear will just grenade I was wondering if the was a way to just straight gear it

---------- Post added at 08:10 PM ---------- Previous post was at 08:09 PM ----------

That air and oil-cooled 750 was sold here until about 10 years ago. The most common model was the Katana 750. The sprocket on it is probably a 530. I'd try putting a smallish sprocket on the FL250 gearbox. It will probably break and be lot off effort finding out.

Ironically, not being water-cooled adds the complication of routing the oil cooler and having to keep airflow over the cylinders when they're buried behind the seat, fenders, and exhaust.

The gear box that is on the rear will just grenade I was wondering if the was a way to just straight gear it

 

[bighead]

To much power. The reduction unit cannot hold that power. You can take the axle out. One side has a hanger that bolts to the frame. The other side uses the the trans reduction unit to hang axle. The bearing races are the same. So maybe just maybe you can get a right side hanger and bearing to hang axle. Look into machining the axle down to one inch and key way. Use the bearing race on the axle that went into the trans. I never did any of this. But thought about it many times.

Better off just buying 40mm cart axle and hangers.

No suspension so this will be scary ride.

 

[Kartorbust]

It wouldn't be too terribly hard to convert the rear end to swing arm. Small bit of fabricobbling to make it all work.