Honda ATC110 engine swap options?

[Bugzturbo]

I am rebuilding/modifying an `85 ATC110. The rings are shot, and while it does run, the previous owner filled it with 85w90 gear oil to keep it running (compression was too low with regular oil). I got the strange feeling that bad rings sin't the only thing I'm gonna find in there due to running it like that. So I'm kinda leaning towards a swap. Googled and searched several sites, but no real solid swap info. I've seen that the Lifan engines are a possibility, but no concrete yes/no answers. I know the Lifan has no front mount on the head, and the ATC110 requires this to strengthen the frame, but this part is not a concern for me as the frame will be getting modified as well, so I can easily add a downtube and run it under the motor to make the frame rigid and not require the motor attachment up front. But is the rear mounting the same on the Lifan vs the 110? I was looking more at the 140 or 150 motors they offer. Or is there something else I can use? I don;t want to go totally crazy with the swap, but if I have to completely redo the 110 anyway, why not go bigger/better? Thanks for any advice.

Bug

[jb2wheels]

The Lifan / Chinese engines use Honda 50/70cc mounting - slightly different from the 90/110/125.

DRaTV.com covers this pretty well for swapping Lifan into CT90.
http://dratv.com/newreen.html

Here's a sweet GPX into 90/110 conversion build thread:
http://www.3wheelerworld.com/showthread.php/78652-Honda-177X-ATC-!!!!SOLD!!!!-!!!!SOLD!!!!?highlight=gpx+177
http://www.3wheelerworld.com/showthread.php/91844-2008-Gpx-177-Atc?highlight=gpx+177
http://www.3wheelerworld.com/showthread.php/90296-GPX-177-update?highlight=gpx+110

Don't know if the pics are still there - I can't tell at work.

When I built my 90/110 hybrid trike, I used an 84 110 engine and electrics. They're easy to rebuild. I did a cheap rebuild:
- lapped valves with compound. The guy at the local shop (Dave's Cycle on Round Rock TX FYI for locals) had the right spring compressor so I took him the head and he pulled the valves for me then put them back in when I came back with the finished work
- dingleball honed the cylinder (Dave's again, $10 I think)
- new rings ($30 as I recall)
- re-used the piston, just cleaned it well, especially the ring lands
- gasket set includig valve seal($?? cheap)

That engine was rough - had the nastiest oil I think I've ever seen and a 3/8" ring of muck in the centrifical "filter". And it was bug killing smoker. And hard to start due to low compression.

Ran great when I was done, though. Good compression, easy start, no smoke, and plenty of power for a 110.
http://www.3wheelerworld.com/showthread.php/110610-Finished-my-90-110-hybrid

Food for thought