DT50 engine swap

[beardface]

Hello, does anyone know what is the easiest 4stroke engine to put in an old DT50? Looking to use anything from 50cc to 125cc, ideas very welcome. Thanks
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[UnspeedySam]

[beardface]

My mate is fairly handy with a welder

Only putting a 4stroker in there for reliability, really not bothered about speed as have bigger bike for that but just want a cheeky little back road commuter c90 engine transplant would be idea or a cg clone like you say but apart from the brackets are there any other probs I might encounter?
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[UnspeedySam]

[beardface]

Cheers for the replies Sam, will keep all that in mind when the time comes - nice one mate.
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[Teflon-Mike]

I think I'd be a bit more worried about obviouse non 50cc engine, and re-registering it as new class of vehicle, ie 'motorcycle'.
DT50 lumps pretty tough; abused by generations of 16 year olds for decades; I would think you'd struggle to find something hardier to fit than whats in it, or as 'tuneable'.
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[Fladdem]

I'd imagine a DT 50 engine would be pretty robust. If it's anything like my MT5. I did 5000 miles, flat out. I purposely tried to kill it. It has 20,000 miles on the original piston, not sure about rings.

If I killed it, that would give me the motivation needed to stick the H100 engine in.

Each engine should be just as reliable as the other, just requiring different maintenance. I hate to say it, because I'm doing it to, but swapping out the 50 engine to bodge in another, will lose all originality. I think the 50 engine would be more fun anyway. My 50 did 45 flat out and the Yamaha's are meant to be stronger, so you'd have a similar speed to a Chinese CG engine, similar fuel economy, maybe slightly better on the four stroke. But I think butchering a soon to be classic moped isn't the right way.

Just my thoughts though.
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Current:1991 Honda MT50 (Soon to be a H100/MTX/MT5 hybrid), 1976 Honda Cub C70, 2005 Honda Varadero 125, 1993 Yamaha TTR250 Open Enduro , 2010 Road Legal Stomp YX140, 1994 Honda CRM 250 MK III, 1999 Cagiva Mito 125, 1992 Honda CB400 Super Four, Stomp T4 230, 1984 Honda H100s, 2009 Sym XS125K
Past:2003 Aprilia RS125, 1982 Kawasaki GPZ550(FREE BIKE!)
I'm having more fun than a well-oiled midget.