4 Stroke engine clutch problem?

Discussion in '4 Stroke Bicycle Engines & Kits' started by Dawelny97, Jan 10, 2020.

  1. Dawelny97

    Dawelny97 New Member

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    Hey all. Im pretty new to this website so forgive me if I posted in the wrong thread. I've never built a motorized bicycle before, but I am about to with this 53cc 4 stroke engine kit that just arrived. I inspected the engine made sure everything was okay and what not, and I noticed that when you pull the pull starter the gear on the belt drive transmission moves as well. I thought that was only supposed to move when you give it gas, not when your starting it? The kit is brand new I haven't even put it on the bike yet. Is this normal? Is the output sprocket supposed to move when you do this? I have a feeling its going to try to move the wheel when I try to start it for the first time
    :-||
     
  2. curtisfox

    curtisfox Well-Known Member

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    Have you tried to hold it while turning, may be just new and stiff
     
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  3. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    I'm not familiar with any 53cc 4-stroke kits, (so I can't picture what clutch it has).
    Can you post some pictures of the engine & clutch??
     
  4. Dawelny97

    Dawelny97 New Member

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    Here are some pictures of the engine without the transmission cover. It's huasheng 144f with belt drive. You can find it on ebay by just typing 4 stroke bike kit with belt gear. So basically what happens is when I pull the pull starter, the entire belt moves. To my understanding this should only happen when I give it gas, which is when the centrifugal clutch engages. So if my belt is moving without it even idling, (just pull start) does that mean its engaging too early? I've tried pulling it while holding the gear in place but it still moves, that could just be because I have weak fingers tho. I can't even mount it on the bike yet because I need to get a crank puller. Im just hoping its some weird break in thing and the clutch isnt stuck


    IMG_1913.jpg IMG_1914.jpg IMG_1916.jpg
     
  5. curtisfox

    curtisfox Well-Known Member

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    Venice, on the other forum Dan has one he races, seems to like it much better, just enough difference to make it worth while over a 49cc. Although i haven't been on that forum for over a year now, they were for sale on some regular venders for a while, then not for long........Curt
     
  6. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    Remove the large pulley & then you'll be able to remove the clutch to inspect it...
    I'm betting that the clutch is just installed wrong
     
  7. Dawelny97

    Dawelny97 New Member

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    I figured there’s no point in getting that clutch looked at if I can’t even put it on the bike. So I tried putting it on the bike and the stupid carb won’t fit unless it’s at an angle. Im worried cause someone said something about oil or whatever. I’d it okay for it to be like this?
    51FE010B-DBC1-40BC-8792-68C19E995C1B.jpeg 51FE010B-DBC1-40BC-8792-68C19E995C1B.jpeg

    So is it okay to mount the 4 stroke like this? I don’t want to mess with the clutch yet until I know there’s a problem with it so I’m going to try to mount it first. Also if I hold the sprocket while starting it still moves. But if I hold the gear itself on the transmission while starting it doesn’t move. Sorry for the late reply I’ve been busy.
     

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