GS 650 engine from 83 on a 78ish gs550 frame?

[Guest]

Hi guys.
New guy from denmark here!
I have a gs550 from 77/78 and i wonder if a gs650 engine will fit My 550 frame og do the topend fit My 550 engine?
I Hope the information where enough.

[Radrider]

And will i be able to convert the 650 engine to kickstart from My 550?

[Wraith]

Hi there, the gs650 engine will not go in the gs550 frame or not with out a lot of ****ing because of the shaft.
The gs650 top end will go on the gs550 bottom end.

[Radrider]

Hi thanks for the fast reply
So it should be an easy fix to put the 650 cylinder and top on My 550 Block?

[DohcBikes]

Hold on a minute here.

Is your 650 engine chain drive or shaft drive

[Radrider]

Both engines Are chain driven

[DohcBikes]

Then yes the 650 engine will fit you'll just end up with a 5 speed instead of a 6 speed. Lot less work than doing the topend swap. Don't worry about the kickstarter, you don't need one.

[Radrider]

But the kickstarter is so cool 😎

[Radrider]

I am so excited to hear that it will fit!

[Nessism]

There are several long thread here where guys converted their 550 to 650. Just swapping in the engine is easier though.

Here is one such thread...http://www.thegsresources.com/_forum...50-699-project

[DohcBikes]

lots of threads with no finished pics or defining details...

[tkent02]

Defining detail..... Way more powerful than it was as a 550. Quicker, higher top speed and gets there a lot easier, chugs around slowly, you can whack the throttle open at 2,000 RPM in 6th gear and it chugs right out, or you can kick it down a few gears and scream it at 10,000, either way it's a lot more powerful than the 550 was doing the same thing. Its gone from a wimpy little bike with a great top end kick to a really useful motorcycle that pulls hard anywhere and everywhere.
You want a picture? I'll post one as soon as photobucket gets back up.

[tkent02]

Hi thanks for the fast reply
So it should be an easy fix to put the 650 cylinder and top on My 550 Block?

Not all that easy. You have to split the cases to hog the upper one out for the 650 cylinder's bigger sleeve diameter. Quite a bit of metal had to be ground away.

[Radrider]

I think i will buy and put the complete 650 engine from 83 on My 550 frame from 77/78 i think and just miss My kickstarter :/

[vaggmak]

Radrider. ..did you do the conversion? ?