Will the GS400, 425 or 450 motor fit in a GS250t frame

[Briars]

Hey guys I have a nice little 81 250t. It is in great condition and I love it.

I am curious though if the other motors will fit in the frame. I would like just a bit more power.

I have heard the 400 is a punched out 250, if so will the top ends interchange?

Any help or links would be greatly appreciated.

[Flaming Chainsaws]

Hey guys I have a nice little 81 250t. It is in great condition and I love it.

I am curious though if the other motors will fit in the frame. I would like just a bit more power.

I have heard the 400 is a punched out 250, if so will the top ends interchange?

Any help or links would be greatly appreciated.

I'm pretty sure the whole GS450 engine will swap right in!

[Charlie G]

There aren't too many 250-450 experts here. I don't know if it would work or not. The 400 and 750 were the frst of the GS line. If I can provide you some measurement from my 450, send me a PM.

Charlie G

[Charlie G]

I'm pretty sure the whole GS450 engine will swap right in!

FC, what makes you say that?

cg

[Flaming Chainsaws]

FC, what makes you say that?

cg

They look the same to me . But I might be wrong.

[cowboyup3371]

If you are wanting more power why not buy a bigger bike?

[Briars]

I was just thinking if I come across a 450 I may get it and swap them out. I have the 250 chassis in pretty good shape but would like to cruise at highway speeds a bit easier.

My son will probably end up on it and from age 14--16 our state has a 250cc limit. If I leave it badged and titled as a 250 he could still benefit from the extra few horses the 450 has. He is going to be well over 250 lbs by the time he get 14 and able to get his license.

As for just sheer power my 08 GSXR 1K has more than I could ever use. I did open it up once thinking I would see 160 indicated. I was by that so quick I shut it down at 172 indicated. Probably only 155 or so real speed. I looked down as I was slowing down and I was still in 5th gear.

[323D]

Did anyone do this?

[323D]

I am also looking into this for my 250t

[nejeff]

If you are wanting more power why not buy a bigger bike?

+1 on what Cowboy said. Just sell the 250 & buy a larger bike. Don't waste time & effort shoe horning in a bigger motor.

[Mekanix]

Although, If your really bored, Throw in a 500. With that single down tube the exhausts will fit around it.


You can't just drop the top end on there.

The 250 crank has a shorter stroke and the cylinder jugs won't fit in the case of the 250 i don't think.
Its the same engine but everything is scaled down.



There is no easy swap for this one except maybe a 300 engine?

[323D]

have any links to do just that 500 into 250 frame? or ya joking

Although, If your really bored, Throw in a 500. With that single down tube the exhausts will fit around it.


You can't just drop the top end on there.

The 250 crank has a shorter stroke and the cylinder jugs won't fit in the case of the 250 i don't think.
Its the same engine but everything is scaled down.



There is no easy swap for this one except maybe a 300 engine?

[tkent02]

If you are wanting more power why not buy a bigger bike?

Come on, what fun is that?

Anybody can buy bigger bike.

It takes a real GSer to make one.

[Mekanix]

have any links to do just that 500 into 250 frame? or ya joking

It can be done, Don't know anyone that has but it would be cool.