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Motorized Tandems, Trikes and Recumbent Bicycles Trikes (tricycle) and recumbent bicycles can give the ultimate in comfort for cruising on long trips or just around town. Ad an engine and they will really turn some heads.

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  #1  
Old 09-19-2016, 09:39 PM
stabbyjoe89 stabbyjoe89 is offline
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Join Date: Sep 2016
Location: Chicago, IL
Posts: 2
Default Predator 212cc Worksman Adaptable motortrike

Hey guys,

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


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?
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Old 09-22-2016, 09:23 PM
stabbyjoe89 stabbyjoe89 is offline
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Join Date: Sep 2016
Location: Chicago, IL
Posts: 2
Default Re: Predator 212cc Worksman Adaptable motortrike

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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