In reply to Basil Exposition: OK, I'm out of date. Not the first time nor won't be the last. I've been told I'm old and out of date by youngsters. 
In reply to Basil Exposition: OK, I'm out of date. Not the first time nor won't be the last. I've been told I'm old and out of date by youngsters.
A Datsun 1200 is 1500lbs and fitted with a Nissan A15 will easily make 100 whp. Nissan used their A-series motor until 2007 in various vehicles worldwide.
Contrary to urban myth Nissan A-series is not a BMC copy, it's a 5 main bearing motor with alloy head and weighs a whooping 190lbs. My race engine is 172lbs complete with oil and the stock gear box is 38lbs. A 5 speed overdrive box is about 54 pounds.
The stock bottom end will rev to 9000 rpms, the top end needs nothing more than a set of dual valve springs, the stock push rods, rockers etc will tolerate huge revs as well. I rev my car to 8200 on a regular basis without issue. My motor is making around 105-110 whp and I have $2300 into it (that's everything including the flat slide carbs header bigger valves etc). Note the A15 I picked up unbeknownst to me sat with water in the sump and ended up needing $350 of extra machining.
My car is 1674lbs; I have a way overbuilt roll cage, roadster rear axle, 280ZX struts, race seat on passenger side for students and it's still all stock sheet metal. If I'd built it with weight as a priority rather than things I could buy cheap I could have easily shed another 75-100lbs. It's possible to get a street 1200 just to under 1500lbs.
On Datsun 1200.com we have several members with Spridgets and Morris Minors who've fitted Datsun engines, it's fairly common and a nice upgrade.
Tom
I'm going to say Toyota 4AGE with sidedraft Webers. A T50 gearbox will bolt up and you'll be set. I have a couple 4AGEs that I wouldn't mind rebuilding for you. The one in my MR2 has been running perfect since its rebuild in 2005. Dead reliable. Lightweight flywheel and some cams make a world of difference.
Fiesta 1.0L ecoboost.
The 22re is way too tall FYI. That is one of the biggest issues on a Midget engine swap.
In reply to singleslammer:
Oh. Yes, they have a pretty long stroke...
Bike power is super easy and wickedly lightweight. Sequential six speed trans allows clutchless upshifts. Just mount longitudinally and run the driveshaft right off of the front sprocket. You can buy sprockets that have a ujoint right on em.
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