Living in the mountains/breaking in engine?

Discussion in 'Motorized Bicycle General Discussion' started by carpetrugger, Dec 22, 2009.

  1. carpetrugger

    carpetrugger New Member

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    I live in the mountains a few miles below Big Bear Ca. elevation is 5'5oo ft. and with in two miles it's at 7000 ft. I have two options, up hill or down hill. I've read not to use the throttle down hill and right now with my stock 44 tooth sprocket going up hill I still have to peddle most of the time and it seams to me this is quite a strain on the engine I know it is on me. My question's are can I safley break my engine in while it's working so hard going up hill? I going to order another sprocket but not sure what size to get 48 tooth 50 or maby 56, need help on this decision as the only experance I have is with the stock 44 tooth. I've been transporting my bike down the mountain to ride but I really want to be able to ride it up here.
     
  2. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    Actually, you should give it some gas while going down hill because the only oil that the engine gets is mixed in the gas!!!
    Your engine will start to get more power as it breaks in.

    I don't know how much you weigh? but I weigh around 200 lbs, & a 44 tooth pulls me up big hills with a running start... so, you might go with a 46 or 48T sprocket if you really think you need a lower gear.
    Keep in mind that the lower gear you go, the slower you will go on flat ground & down hill!

    I don't see any problem breaking in the engine while going up hill, just try not to 'lug' the engine, & use 24:1 oil mix for break in!
     
    #2 Venice Motor Bikes, Dec 22, 2009
    Last edited: Dec 22, 2009
  3. steef

    steef New Member

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    I would think about getting a jackshaft kit installed and use a small 24 tooth frount freewheel sprocket and the 9 tooth sprocket for the shiftkit.Would probably cost you close to $300.but would probably give you the torch you need toget up that hill. Check it out at Sick Bike Parts
     
  4. carpetrugger

    carpetrugger New Member

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    Thanks Venice, problem is I don't have a straight away around here to build up speed it's either up hill or down hill. I found a guy that has a couple sprockets he will sell me, a 48 & a 50 both for 20 bucks shiped. For 20 bucks I'll try them both and use which ever one works best for me. Thinking of buying a parts bike off craigslist and using the rear wheel for my 44 tooth. I can't afford a shift kit yet but some day maybe. I have a Schwinn Jaguar and also weigh about 200lb. I'm running a 47cc Dax engine and only have about 15 miles on the engine. I'm sure the engine will develop more power as it breaks in I just have to be able to ride it far enough to break it in. I'm hoping one of these new sprockets will make it possible. If you use 24 to 1 during break in what do you recommend afterwords?
     
  5. Nougat

    Nougat New Member

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    If it were me, I would do an expansion pipe and new air cleaner (and make sure the carb is tuned right) before I changed the sprocket. More power out of the engine will deal with the hills without sacrificing top end.

    If you still have trouble with the hills after that, then change the sprocket, and you should be able to do a milder sprocket change, saving yourself some top end (in comparison with changing the sprocket and leaving the engine stock).
     
  6. carpetrugger

    carpetrugger New Member

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    Don't I have to wait untill it's broke to try to tune the carb, seeing how the spark plug will be wet from the extra oil, or is this not normal during the break in period?
     
  7. mdlee1958

    mdlee1958 Member

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    You need to set your jet needle to the last notch. I live at 5400 ft here in Colo and thats where I have mine set at. As long as you have even and consistent throttle there is nothing wrong with breaking it in going down hill. If that were the case every 2 stroker in Colo would have died out with the dinosaurs....LOL.
     
  8. mdlee1958

    mdlee1958 Member

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    My first HT engine was "broken-in" going down hill and it lasted 5000mi before the front engine mount finally broke. I eventually fixed the mount and it is living a very happy life on my 2nd build.
     
  9. mdlee1958

    mdlee1958 Member

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    PS: last notch being on the blunt end of the needle !
     
  10. Nougat

    Nougat New Member

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    No matter where you are, you'd ideally tune the carb (needle and jet) to be most correct for your fuel/oil ratio. If you change your ratio, you'd change your tune.
     
  11. mdlee1958

    mdlee1958 Member

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    It does......thats why you don't do it until after break-in and the rings are "seated"
     

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