what do i look out for???

Discussion in '4-Stroke Engines' started by eltatertoto, Apr 12, 2008.

  1. eltatertoto

    eltatertoto Guest

    i figured i would be the 1st to post here, because, i want to ask a question. i just bought a 4 stroke. i neeed to know what to look out for. (cans of worms issues, like the happytimes have issues with the intake gaskets.) i just bought this engine http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&Item=190214177567&Category=42319&_trksid=p3907.m29 i think it is the equavilant of dax's rack mount titan??? but, i just ordered about 30 min agao, and i want to know what too look out for. thanks guys! i am a 4 stroke noob (for the bikes)
     

  2. sparky

    sparky Active Member

    I dunno... but I'd be interested in knowing the answer to this question as well. I'd also like to know if anybody has found any parts for the GXH50 that don't fit on this Hua Sheng engine.
     
  3. fetor56

    fetor56 Guest

    Tater/sparky;
    I havn't tested this but from what i hear that figure 8 "SkyFire" gearbox does NOT fit on the GXH50 engine,nor does it fit a different model of Huasheng engine(i believe there's 2 models)
    The Huasheng engine itself is VERY good but NOT the same as Dax's....Dax's has upgraded Japanese and American bearings for longer life and higher sustained performance.I havn't seen Dax's engine price(by itself) but i bet it's more.
    Tater..please do more homework on this SkyFire gearbox cos it's about half the price of the Grubee and the Grubee is far from perfect.
     
  4. eltatertoto

    eltatertoto Guest

    is that a look b 4 ya ask, or is that a oh, carp!!! there is major issues! suguestion??? thanks. cleanin my room now, but i thought id ask.
     
  5. If you have a lawnmower that you've had for 10 years and never did nothing to it but add gas and oil and it still runs then by george there isn't much to do huh?

    It seems all that's ever done to these is a valve adjustment if even that.
    I think your centrifugal clutch will wear down before your engine will.
     
  6. eltatertoto

    eltatertoto Guest

    thanks large! now i just gotta build my own shed lol. i had to put this bike on a box so i could get the door to close!!! lol (or put my push bikes in my room :yuck:)
     
  7. fetor56

    fetor56 Guest

    @Tater.
    I'm only starting to get into this 4-stroke caper myself but from what i've heard it's got problems...it's not as good as the Grubee and the Grubee itself is only acceptable.I'de LOVE to hear from someone those actually using the SkyFire cos i MUCH prefer it's looks and compactness(if that's a word)
    I hope i'm wrong......i'm hoping i hear from someone that sayes it pees all over the Grubee. :smile:
     
  8. eltatertoto

    eltatertoto Guest

    thanks large, but ive got a 33 wide by 70 inches tall space to put it in. it has to be not as high, and not wider than my porch, so the park can consider it a garbage can holder (park=trailer park manager) were only allowed a shed or a garage, not both or 2 of one :(
     
  9. eltatertoto

    eltatertoto Guest

    and, fetor, im gonna ignore that, cause i wanna keep positive vibes about me:grin:
     
  10. SirJakesus

    SirJakesus Guest

    Well it looks like a nice kit but I have no personal experience with them. What bike are you putting this thing on anyways?
     
  11. fetor56

    fetor56 Guest

    By all means keep the faith...i'm still interested to know more about this gearbox cos i'm just about to order 2 Grubees and i wanna know(from other peeps personal experience) if anything's better.
     
    Last edited by a moderator: Apr 13, 2008
  12. eltatertoto

    eltatertoto Guest

  13. eltatertoto

    eltatertoto Guest

    can somone show me what a grubee is????? lol
     
  14. fetor56

    fetor56 Guest

    Last edited by a moderator: Apr 12, 2008
  15. eltatertoto

    eltatertoto Guest

    so, same engine, different gearbox??? hmmmm could i change that out in the future??
     
  16. fetor56

    fetor56 Guest

    Sure...but yours might be better anyway....that's why i want ppl who have yours to comment.
    PS...anyway it's Sunday morning and i gotta go to work....the things i do to get dough for these motorized bicycles............the pain. :-x
     
    Last edited by a moderator: Apr 12, 2008
  17. eltatertoto

    eltatertoto Guest

    Last edited by a moderator: Apr 12, 2008
  18. Irish John

    Irish John Guest

    Well Tater that kit is the suppliers answer to the Grubee kit. I'm getting one myself soon on trial. It has a couple of things that are better than the Grubee kits - firstly it comes with a set of cranks that don't necessitate replacing your bottom bracket; secondly, they include a strap for holding the muffler to the frame that looks as if it has been designed for the purpose and appears to be of reasonable thickness. Apart from that it has the same chain tensioner -they make big about it being on roller bearings but the spindle is the same soft chinese crud that strips when the nut is tightened.
    It uses the old HT tank which looks better than the tank that comes with the Grubee kit but probanly has a smaller capacity. The silencer is of the chapest HT type that holds the muffler in with 2 crud screws that like to come out and leave the muffler tube lying on the road. You'll need to carry spare screws taped onto the bike. I'm certain that it is the Huang Shen motor that Grubee uses so that is probably sort of OK. The gearbox was the difficult part for them to produce. For patenting reasons they couldn't rip off the Grubee gearbox because that is made in China and will be protected by patent - if was made in the US they's have ripped it straight off. They don't include in pictures of the inside of the gear box and I think we all know why.
    That is the main draw backand I'll soon find out about it because I'll be getting one on triall. I'm not expecting much from the gearbox but if they've made it to fit the HuangShen then it should be able to fit the Grubee that is made for the same engine. That's what I think but I wouldn't go on anything they say. The tray that holds the engine its hard to see if it is made well enough but you can be sure that the bolts and studs that are attached to it will all need to be replaced with non-chinese steel ones but that is no worse than the Grubee kit. I think the engine and the pedal cranks and sprocket are OK but the rest of it is the same old crud that only the Chinese know how to make. Oh yes, I don't trust the machining of the drive sprocket and the photo shows the chain looking uncomfortable on it. The chain could be faulty as well and I'd always recommend throwing the chain out and using a Yaban 415 or a KMG freestyle extreme for a BMX bike.
     
    Last edited by a moderator: Apr 12, 2008
  19. cruiser66

    cruiser66 Guest

    What to look for

    Hi Tater,

    I bought this kit last year. I have it on a 15 year mountain bike frame and had no problems. Your church bike looks good but the three piece wide pedal crank that comes with the kit will not fit your bike. My kit came with the old style JL Hoot tranny. This tranny was problematic because the straight cut gears were noisy. The solution was to put gear oil in since the tranny did have fill and drain plugs. However, the oil would spray out of the vented fill plug unless you ran the tranny almost dry which would increase gear noise and make for rough clutch action. Your improved version has angle cut gears for the clutch gear and the big ring gear but they eliminated the fill and drain plugs. Liquid gear oil will probably give the best consistent lubrication and thus noise reduction but it will be difficult to do unless you duplicate the old style tranny fill and drain plugs. Then you will have the oil spray problem, unless you do what I did. This mod stops oil spray completely. I use 75W-90 synthetic gear oil (about 6 ounces). I'm still experimenting with the final amount. Another help for gear and engine noise is dropping the original rear sprocket to a 36T. This keeps the revs in the "sweet spot" at about 25-30 mph cruising. This engine uses a 15 mm output shaft versus the Honda's 16 mm output. That's why the trannys are not interchangeable depending on the engine. I like the Huasheng engine and have had no problems. Starts every time and 4 strokes have the forced air cooling which helps reliability. If you have any questions, feel free. Here's some pictures of the anti-spray mod. Just a baffle made with sheet metal and pop rivets. I also supplied a before shot (the greasy one).
     

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