Predator 212cc Worksman Adaptable motortrike

Discussion in 'Motorized Tandems, Trikes and Recumbent Bicycles' started by stabbyjoe89, Sep 19, 2016.

  1. stabbyjoe89

    stabbyjoe89 New Member

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    Hey guys,

    I'm building a Worksman Adaptable tricycle into a motorized trike using a 212cc Predator 6.5hp engine
    [​IMG]

    I have a very thorough knowledge of bicycles, but pretty much haven't got a clue about engines apart from the basic mechanics of how they function. I'm getting a Predator from Harbor Freight and purchasing all the other gasbike.net trike kit parts from ebay/amazon. I aim to use this trike to commute to/from work, I'm aware it's not street legal. That's why I'm trying to be as discrete as possible about it. Planning to cruise at ~15-20mph in the bike lane with lights/reflectors and follow traffic laws to appease cops.

    I'm posting here because I need some advice. I want the engine to run as quietly as possible since I'll be in traffic. I was wondering if it's safe, in terms of backpressure and stuff, for me to only install an aftermarket exhaust pipe and muffler. Down the line, I do plan to also get an air filter and re-jet kit to improve performance, but I was wondering if it's safe to wait on those and for now just run the engine as is, but with an aftermarket exhaust & muffler to quiet things down.

    Thanks so much!
    Plamen

    PS: I don't know how to pick between the hemi and non-hemi, they are the same price and I've heard hemi is slightly better stock, but non-hemi is easier to upgrade aftermarket?
     
  2. stabbyjoe89

    stabbyjoe89 New Member

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    Also I was wondering what a good sprocket size would be to pair with a 10T driver?
    Tricycle weight with rider, engine, and gear will be about 330lbs. The 212cc 6.5hp engine is rated at 3800rpm, 8.1 ft-lbs@2500rpm, I'll be using a torque converter. I'd like to be able to cruise at 20-25mph and care more about less engine strain and durability rather than top speed. Choices I see with the kits seem to be 36, 40, 44, 48 mainly? Thanks!
     

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