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Post by farmer54 on Nov 7, 2016 15:47:18 GMT -5
Looking at buying a new moped and was wondering about the engine. It is a 139 FMD which I think is a air cooled non-forced engine also I've read those engines are in Chinese 50cc dirt bikes. If anyone know anymore about this engine please tell all you know. The moped is a SSR Lazer 6 it is brand new and won't be released until after the first of the year. There is a short video on line showing it at the AIM Expo and I think the styling is pretty neat reminds me of the bikes I grew up with back in the mid to late 60's. thanks, frank
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Post by tortoise2 on Nov 7, 2016 16:19:39 GMT -5
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Post by Cincikid on Nov 7, 2016 16:23:03 GMT -5
Sweet!
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Post by dan50 on Nov 8, 2016 1:38:44 GMT -5
Very cool and definitely retro.
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Post by dan50 on Nov 8, 2016 1:41:20 GMT -5
Engine code.
F= natural air
M= Motorcycle style engine
D= 70cc
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Post by 90GTVert on Nov 8, 2016 7:26:58 GMT -5
That does appear to be the Chinese pitbike style of engine. Increasing performance should be easy, as you can do an engine swap with one of many larger engines of that style. When I was into them long ago, 50cc, 70cc, 90cc, 110cc, and 125cc were all popular. Now you can swap an engine in that's 150cc or more. I've swapped a 50 for a 110 before and the only fitment issue is that the engine is longer, sitting farther forward, because of the increased stroke of the bigger engines. It was a problem on my old bike, but that thing was tiny and even a 49cc would nearly touch the front wheel with the head studs. From the pics above, it doesn't appear that you'd have any trouble at all there.
You would need to choose an appropriate starter style, as they come with no e-start, top mount, and bottom mount e-starts. No e-start should fit wherever. If you want electric start though, it may not fit if you get the wrong style.
You can get them in automatic, semi-automatic, and manual. Automatic of course means you don't shift. Manual means you use a clutch and shift. The semi-auto requires shifting, but you don't have to operate a clutch. They also come in different gear amounts and patterns. At least when I was into them, 4 speeds were most common for the shifting versions. By different patterns, I mean some were 1 down 3 up and some were 4 up or 4 down and some would go around in circles; meaning if you shifted past 4th it would go to neutral and then back through the gears again. Gear pattern is pretty much preference or just what is available. There are power output differences between them. The full manual seems to suck up the least power and the automatic ends up a little slower than the rest.
You can get sprockets to change the final drive ratio. Rear wheel sprockets will depend on the application, but there should be a few choices for front sprockets that are more universal to those engines. They typically use #420 chain, which is common enough that I picked up a link from Ace Hardware when I needed it at one point IIRC.
You can get big bore kits and big valve heads and 4 valve setups and all sorts of go-fast goodies that can get really expensive if you go with the high end brands or can be reasonable with a less-frills brand and build. Going from 49cc though, an engine swap is easier IMO.
You can also get CDIs, carbs, intakes, and all sorts of other parts for them. Full exhausts will depend a good bit on the application.
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