Gas tank placement for 4-stroke HuaSheng 49cc engines

Discussion in '4-Stroke Engines' started by bakaneko, Mar 10, 2016.

  1. bakaneko

    bakaneko Active Member

    Anyone know if the gas tank has to be above the engine? Can it be at the same level if not slightly below? For example, the bikeberry friction installation video showed that the gas tank is either at the same level or just slightly above the engine.
     

  2. P/C Geek

    P/C Geek New Member

    Above as it is gravity fed.
     
  3. bakaneko

    bakaneko Active Member

    Thanks. I think the gas intake is at the middle of the engine so there is at least some leeway for an unconventional build. Also, does anyone know the vibration comparison between a 4-stroke and 2-stroke? It seems the 4-stroke has less vibration from my observations. Thx
     
  4. KCvale

    KCvale Motorized Bicycle Vendor

    The HS engines have 2 carb types, one is for gravity feed and the tank needs to be above the carb, the other can suck up from below.
    Like an outboard boat engine it needs an in-gas line bulb pump to prime it first, but then it will suck the fuel up on it's own.

    I have little (~1/3 gallon) gas thanks that bolt right to the top of HS engine, they come attached to the 53cc HS 144F's I buy, I don't use them so I have a passel of them if you want one.

    As for vibration a frame mounted 4-stroke has virtually no vibration, no clue about how they do on a friction drive above the back tire on a bike rack does however, never have or will build one as I think that is about the stupidest place ever to put an engine and worst way to propel a bike.

    Some people love them though even if they need need special kickstands just keep them from falling over because of absurdly high center of gravity they create.
     
    bakaneko likes this.
  5. bakaneko

    bakaneko Active Member

    Thx for the reply, KC. I wanted to get your opinion on putting a 4-stroke behind the seat on an reinforced rear rack. I would place it in-frame but I doubt the 4-stroke will fit in the frame. This is the bike I want to do a bigger project on but first I figure I can try out the bike handling and what not with a 49cc 4-stroke. I see that you have some fat tire bike builds but the cruiser type; I really like the mountain bike look and feel. Please feel free to be brutal with your reply. I guess the advantage of the rear rack is that I can offset the motor as needed to compensate for the fat tire width.
     

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  6. KCvale

    KCvale Motorized Bicycle Vendor

    Uggh, the Mongoose, what an unruly bike despite it's dual disc brakes and about the worst thing to try to motorize in my opinion.

    The only thing I trusted to put in was was a low center of gravity electric shifting system as you can't even get a 2-stroke in without major mounting mods.

    [​IMG]

    [​IMG]

    Eloquent, low center of gravity, a shifting system, but I still didn't like riding it even with near a 1KW of battery power.

    I really can't even imagine what an Albatross it would be with a big 4-stroke above the back wheel as it was so cumbersome even with that electric that I pulled it off and it still sits as a kluge in my back yard with no motorizing and nobody likes to ride it as a regular bike either it's that bad.

    Just my honest opinion bud, others may differ.

    What I really liked in a really fat tire bike was the Sun Crusher, it was a joy to ride even with just dual V-brakes.
    I put a beefed up 2-stroke shifter in this build, but it will take a 4-stroke.

    [​IMG]

    [​IMG]

    Here is a comparison of the two.

    [​IMG]

    Hope that helps as I really did enjoy riding the Sun Crusher but couldn't stand the Dolomite.
     
  7. bakaneko

    bakaneko Active Member

    haha, you are right. the walmart reviews for the dolomite are a bit mix but most are positive considering it is an entry level fat tire bike. unfortunately, the last one on the shelf around my area is gone so I would have to order it from Walmart. so no see (ride around store) before i buy...
     
  8. bakaneko

    bakaneko Active Member

    Oke fellas. How did he do this? There must be less than an inch of clearance with the top tube for a 4-stroke to fit in this fat tire mountain bike. What a trooper to ride in that snow even with the fat tire.





     
  9. JGH122

    JGH122 Member

  10. KCvale

    KCvale Motorized Bicycle Vendor

    I Tried running the video full screen and pausing on side views to see what engine he was using but couldn't tell.
    It also looks like the seat tube was modified.

    Clever whatever it was he used for a power source and drive ;-}
     
  11. bakaneko

    bakaneko Active Member

    Yeh, video is too grainy to tell, but it is impressive knowing that the space between the top and bottom tube on those Dolomite fat tire is comparable to a BMX.

    KC take a look at my 4-stroke build thread; my torque aint great probably due to my transmission and 36T sprocket. I am getting the iridium ngk spark plug soon for 1st upgrade, but I have a video of a guy that has a number of upgrades to his 49cc HuaSheng and the video looks impressive. Since you build these 4-strokes, I thought I give you a heads up on a possible new upgrades for your builds.

    http://motoredbikes.com/threads/new-4-stroke-49cc-huasheng-142f-build.47115/#post-407111
     
  12. GhettoBike

    GhettoBike Member

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