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Old 06-12-2008, 03:18 PM   #1
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$400, 100+ mpg rat bike

The most fuel efficient motorcycle in my collection was running about 75 mpg. Not bad but I new I could put together an inexpensive "rat bike" that would be fast enough for commute and get over 100 mpg.

Started with an old Honda Trail 90 that I bought 15 years ago for $75. It ran then but died and was retired to the pile of old bikes in the back 40. Engine was too expensive to repair so I bought a new Lifan 110cc engine for $235.00 including shipping from Hooper Imports. 2 new street tires and an air filter from JC Whitney for $60. Forks were bent so I put on a set from an XR100 dirt bike. Second gas tank from the XR100. Head light $6 from Harbor Freight. Tail light is a trailer light $5 from Walmart.

The bike has no ignition switch, just a kill button. No battery, lights work off the magneto. No steering lock. A $8 bicycle speedometer. It's as simple as I could make it. It's also UGLY (on purpose). No one is going to steel it even though they could just get on a ride away.

The bike has a top speed of about 50 mph and rides very well. It's licensed and insured. Holds over 3 gallons of fuel in the 2 tanks for a range of 300+ miles. Should last a long time with the brand new engine.


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Old 06-12-2008, 03:38 PM   #2
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freakin awsome!!!!!!!

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Old 06-12-2008, 06:22 PM   #3
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A tour-de-force of shadetree ingenuity..

Kudos, man..
94 Altima 5 spd.. Stock.. 29 mpg combined with basic hypermiling techniques ..

89 Yamaha FZR400 Crotch rocket, semi naked with only the bikini fairing, no lowers, 60 plus mpg

87 Ranger 2.3 5spd.. Does not currently run..
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Old 06-12-2008, 07:40 PM   #4
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I had a moped in college. I totally BMXed it out, knobbies, BMX bars, grips, pedals and covered with stickers. I loved the speed bumps on campus. I'd hit them full speed and do no-footers and can-cans. Damn the bastard that stole it from my storage unit.
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Old 06-13-2008, 02:15 PM   #5
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I have a 1970 Honda Trail 90 that I have put a Lifan 125cc engine on. I'm still finishing the wiring but I'll post up when it's done.


Ignorance is lack of knowing; stupidity is false logic
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