Engine transplant?

**Gubb** · 9th December 2008, 20:41

Right, so i've had a Hyosung engine fall into my lap, which I intend to use in my blown bike.

I've never done anything remotely like this. Is removing an old engine, and installing a new (whole) a tricky job?

Is it just a matter of unbolting the exhaust, taking off the hoses, and unbolting it from the frame? Or is their considerably more to it?

i.e. Can any idiot with a spanner do this? Or am I kidding myself for even thinking that I may be able to achieve this with a few mates over a couple of nights?

**sinfull** · 9th December 2008, 20:43

Originally Posted by Gubb

Right, so i've had a Hyosung engine fall into my lap, which I intend to use in my blown bike.

I've never done anything remotely like this. Is removing an old engine, and installing a new (whole) a tricky job?

Is it just a matter of unbolting the exhaust, taking off the hoses, and unbolting it from the frame? Or is their considerably more to it?

i.e. Can any idiot with a spanner do this? Or am I kidding myself for even thinking that I may be able to achieve this with a few mates over a couple of nights?

Dooooo eeeet

**R6_kid:Me** · 9th December 2008, 20:44

Originally Posted by Gubb

Is it just a matter of unbolting the exhaust, taking off the hoses, and unbolting it from the frame? Or is their considerably more to it?

i.e. Can any idiot with a spanner do this? Or am I kidding myself for even thinking that I may be able to achieve this with a few mates over a couple of nights?

shouldnt take a couple of nights, probably a few hours at max.

Just drain, unplug, unbolt, remove, replace, rebolt, replug, re-fill.

**eelracing** · 9th December 2008, 21:04

If ya aint got a manual sometimes i find taking heaps of digital pics can help when pulling things down.Then its just a matter of following in the reverse manner.
Hope it helps.

**Conquiztador** · 9th December 2008, 21:45

As long as it is same(ish) motor it takes a spanner (or two) and a sixpack and it's done. No real need for any manuals or other complicated stuff. The only recommendation would be to take out and replace same day (or at least same w/e). If you take out and then start the replacement fitting a month later you will really test your memory. And as mine is crap it is a no go zone.

But if the motor is something that was not ment for that frame, then it becomes interesting and you can use your imagination. Here there is really only three main issues that can kill the project:
- Chain on other side
- Electrics.
- Wont fit in to gap in frame!
But even those can be sorted.

Oh and some bikes are made so that the motor can only be taken out from one side. A little trick I use when no help around to lift in motor and match up bolt holes: I lie down the frame on the lawn, then drop the motor in where it belongs and it becomes so much easier than trying to use the feet to keep the motor up while pushing in bolts...

Good Luck!

**HDTboy** · 10th December 2008, 04:43

Yeah, it's fairly easy. If you want, I could come help you for a reasonable rate

**koba** · 10th December 2008, 06:21

Make sure you have (or get) an idea of how tight things should be.
Use loctite.

Doooo eeeet!

**Gubb** · 10th December 2008, 06:39

Cheers guys. Friday night it is.

Yeah, it is the same engine, so no issues there. Looking forward to it now.

Cheers HDT, will flick you a PM if I have any issues.

**Squiggles** · 10th December 2008, 06:59

Gizz a bell if ya need it, done this a few times and getting good at not crushing fingers

edit: If the Hyobag swingarm pivot runs through the back of the motor it may pay to check its not some crazy castle nut that you're going to need a special tool for...

**nodrog:Me** · 10th December 2008, 07:00

just whip the old one out and replace.

**vifferman** · 10th December 2008, 07:55

Originally Posted by koba

Make sure you have (or get) an idea of how tight things should be.
Use loctite.

... on the bolts that require it (it will be obvious when undoing them).
Make sure you use the right grade.

Also, keep track of where all the fasteners, washers and other small widgets go. If necessary, you can put them in small bags or pots and scribble on the side what they are / where they go.

**Gubb** · 10th December 2008, 22:09

Printed out a service manual today with lots of purdy pictures to help along the way.

It doesn't seem like it'll be tooooooo hard.

Fingers crossed. Or crushed.