Reliable towing motor

I've searched the forums and found a couple of threads about towing. Most recommend the Flyinghorse 4 stroke or the Titan xc50s (the current equivalent seems to be the XC50R MAGNUM). Currently I have a little Honda 35gx setup with a rear chain drive system, its a great little motor but its always had a problem with hills. With the trailer on and stuff loaded in it what is normally just a fun work out becomes a horrid slog, and some where in the middle I become terrified that I'm going to blow out the motor. I have designated spots where I stop, de-gear, turn the motor off and we both have a cool down. This makes what is normally a 20 minute ride take an hour, and I can't pump enough carbs or protein into my system to make that kind of exercise sustainable.

What I'm looking for is a 4 stroke that's the same form factor as my Honda that can take the stress of pulling an trailer load. Load break down is as follows.

Trailer = 10lbs
Chair = 2lbs
Folding Table = 26lbs
Shade Canopy = 15lbs
Other = 10lbs
Me = 108
the bike = 35lbs

Total that the motor has to haul = 209lbs

I would be willing to switch to a center mount 4 stroke but I'm almost positive that the triangle is too small since it was not a consideration when I purchased the bike. I've pretty much settled on getting the Titan, but I'm open to other options, the biggest thing I'm worried about with the Titan is over revving so any information on that would be wonderful too. Though I am in the process of researching it.

ajoh: the biggest problem with using a different gear box is I would have to re-engineer the bike, she's my daily driver and I work 6-7 days a week. This is currently how I'm set up.

Venice: You're hilarious! I don't want to kill my self, I just want to be able to tow the trailer... in all seriousness though this wouldn't even fit in the triangle of my little mountain bike. Which is brand new, I cracked the seat post on my other bike but she gave 2 long years of rough service. Not bad for a huffy. But the more I look the more it seems like I'm going to have to build my self a new bike anyway.

I think I found my solution... the That's Dax rear mount chain drive. Upon closer inspection I realized that their mounting kit has ports for the transmission sprocket on BOTH sides, so I won't have to re-engineer the bike EVERY TIME I change something.

I wouldn't even know where to start for motorizing a push trailer. But I realized I still have that busted huffy frame, its the same dimensions as the current bike so if I need to I can set it up as a work stand.

I don't think I will though, if I get the That's Dax rear mount chain drive it will make mounting different configurations mush easier. I'm just wondering how much speed that 18.75 to 1 transmission is going to rob me of. Also does it require right or left hand mounting? If I can mount it left handed then I can put the full gear cassette back on my bike. With the current mounting set up I do not have full gear range.

I check everything on my motors once a week and my honda goes to the shop every 100 hours. She had a clean bill of health last time I took her home, I promise its not a maintenance issue. I put 4000ish miles on my honda, half of which was 2000 foot elevation change up hill and pulling a trailer.

My first china girl I totally ****ed up and that was my fault, I had no idea hat I was doing. The second one was more powerful than my honda, that thing did 30 - 40 mile commutes 5 days a week for 2 years. I had do change the magneto coil and the CDI every 6 months because Hawaii but she did it. That is until I go hit by a car and the head cracked, she was never quite right after that. So I tried a new engine 66/80cc, and the pin bearings exploded into the piston chamber 100 miles after break in. Finally I gave up, it was the third china girl in 3 years. I already had the honda from a belt drive kit that my fiance bought, I'll tell ya cinder and exposed belts are a bad mix.

So I converted her to a chain drive, but I had to forsake most of my bike gears to do it. She runs good, but just doesn't pull the same as the china girl did.

Sorry, that post kinda got a way from me. I'll take a look at your build and see if I can learn anything, thank you.