Ghost racer 7g poor manufacturing

Discussion in 'General Questions' started by Riggsz, Dec 2, 2014.

  1. Riggsz

    Riggsz New Member

    :annoyed: YOU GET WHAT YOU PAY FOR! After installation I installed the proper amount of 10w 30 synthetic oil & proper low octane gasoline in gas tank. The motor started just fine & let the motor break in for 1/2 hr running straight at idle. Periodically also starting before road test. During said road test I ran the engine at low to mid rpm for a 1/4 mile or so then slightly increased rpm as to insure proper break in as I have purchased & installed over a dozen Huasheng 49cc 4 strokes in past. After increasing rpms the motor started cutting out slightly & smoke & oil was pouring out on exhaust & into carb from vent hose. I have ran tests on this engine after this mishap & it seems the oil rings in motor are faulty. Motor being under warranty still I called Gas Bike.Net where I purchased the kit & after 40 attempts to speak with support tech or to file a warranty claim no such luck. Also emailed support with no reply & they are ignoring the fact that they do not want to deal with this problem. I decided to repair engine myself & have found broken rings, compression ring installed upside down, & the piston installed backwards with arrow facing towards exhaust. After honing scratches from cylinder & new rings properly installed with piston facing in correct alignment the motor is running great. The transmission with it's one way 10 tooth sprocket is another story lol Ha!

  2. Imthegrt1

    Imthegrt1 Member

    That's bites ...check them of my list
    Riggsz likes this.
  3. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Idling a brand new motor is the worst thing you can do to it.
    You want load on the rings and you want to rev it out to seat the rings right away.

    A slow low ring load break in makes for a bad ring seal and a glazed cylinder.

    I am pretty sure that the arrow is supposed to be facing the exhaust.
    I have a few Haushengs and a few Honda GX 50's but I never had to take one apart.

    However yours is the second complaint I have heard about bad rings in a Huasheng 7G
    kit from Gasbike unless you are the same guy?
    Gasbike has a history of ignoring warranty or missing parts complaints.

    Where did you get the replacement rings from?
    Did you take pics?

    Glad to hear that you got it running good......
    Riggsz likes this.
  4. butre

    butre Well-Known Member

    this is good advice, but I do have something to add: you do want to idle it until it's warm before you go revving it out, and you don't want to rev it out without load. let it sit until warm, and then ride it hard. just giving it throttle is just as bad as babying it during break in
    Riggsz likes this.
  5. Riggsz

    Riggsz New Member

    Hey SoCal, As far as I know I am the only one that has had this problem with the 7G motors.Everyone has has there theorys on breaking in 4 stroke engines. I have had much luck with the old school method which is heat cycles. The "three heat cycle" seems to be most popular. Turn the engine on, let it idle for 10-20-30 minutes, give it a couple of revs, then shut it down. Cool off completely. Repeat. Repeat again. Ride @ 1/2 throttle for 20 miles or so & shut down. Let engine cool down ride again @ 3/4 throttle for 20 miles shut down cool off. Now full throttle is possible for short bursts @ idle or riding. With most new 4 strokes the honing process is much smoother & not needing such a long break in process & the rings seat much faster. All the new parts in the engine are mating together and the aluminum parts need a chance to expand, from the heat, fully. Riding before the engine is warm (and this reflects both the heat cycle routine and the controversial ride it hard off the floor) can cause the pistons and rings to sit prematurely causing wear and potential damage. 2014-12-02_1851.png
  6. crassius

    crassius Well-Known Member

    chinese pistons are unreliable - I've seen marks both ways on the 2-strokes and wouldn't trust them on 4-strokes either - I always check pin location on the 2s & check alignment marks & dipper on the 4s
    Riggsz likes this.
  7. Riggsz

    Riggsz New Member

    :ack2: I think the Chinese who are putting these engines together should lay off the Suki Yaki!

    Attached Files:

  8. butre

    butre Well-Known Member

    sukiyaki is delicious and not chinese, I think they're personally emptying every can used in the making of these engiens
  9. Fabian

    Fabian Well-Known Member

    You definitely want to be reeving the engine to peak cylinder pressure, which is going to be somewhere around peak torque, to force the piston rings against the cylinder wall to ensure good mating between both surfaces.

    I have never used manufacture recomended (gentle) break-in with any of my engines, be it car, motorbike, agricultural equipment or my motorised bicycle engine. Having said that, i do not abuse the engine, rather just operate it like i normally would, from the very word go, and they run just fine, and (on the dyno) they make more power than those who have followed the gentle break-in process.

  10. KCvale

    KCvale Motorized Bicycle Vendor

    Just to be clear, the HS 142 engine is one thing, the 7G is another, this is an HS 142 engine problem not 7G as it has it's own faults.

    The only issue I have had through a dozen 142's was the oil seal on one I tried to file down for a bearing clutch bell.

    I do them all the same...
    Fire it up, let it warm a couple of minutes, and then a ride around the block and back to the build bay to check everything.
    The next ride is the hard ride, plenty of wide open with typical residential stops.
    After our test miles, ~10 usually we change the oil.

    HS 142 PERFORMANCE TIP: Get an NGK 7544 (VR7HIX) Iridium spark plug, we still can't believe the boost but standard in them all now here.
  11. darwin

    darwin Well-Known Member

    The HS 142f is a great lil motor and you can't beat the price. I've had 3 and would buy another in a heart beat if needed, especially when they're on sale. The vendor not standing behind the warranty is an issue separate from the quality of the motor in my book. Seems in this industry that's a huge issue. They make their money by volume sales and cut corners on service. Only thing I never do to a new engine is to avoid max revs for any length of time till it's broken in and have never had an issue. That includes new cars/MCs and such. Firm believer in changing oil when it's needed.........only real problem I've had with these is the carbs getting dirty. It's from the crappy 10% ethanol they put in there. Even my gas can needs cleaning every year. After about 4 mo you can see a gooey ring starting to form where the gas level is. Not the motors fault.
  12. KCvale

    KCvale Motorized Bicycle Vendor

    Just to be clear the HS142F 49cc and HS144F 54cc engines come in 2 flavors...
    One has a long 5/8" straight shaft that transfer cases like the 7G use...

    And the 142F-1G short shaft with a clutch attached.
    This is what the Stage III, 4G and new 10G use as their clutch bell/pulley is on a bearing supported shaft in the transfer case and not riding on an oilite bushing on the engine shaft.

    10G's are coming soon ;-}
  13. dougsr.874

    dougsr.874 Active Member

    NEVER BUY FROM GAS BIKES this is a case in point....all of the stage III's that I've built use the 5/8 keyed shaft.....I'm disappointed in the new 4G kit I just got....seems much lower quality...time will tell..
  14. KCvale

    KCvale Motorized Bicycle Vendor

    I thought the stage 3's used that short shaft too, been awhile since I seen one.
    Maybe it's the 5G, that one with a pair of non-adjustable chains?

    I don't care for any transfer case that has the clutch bell riding on a bushing on the engine shaft, it don't take long for them to start sounding like one of them wind up monkeys with symbols having an epileptic seizure on crack ;-}

    I like the 4G's and new 10G's, both have the clutch bell isolated in the TC on a bearing supported shaft, the new 10's just have a much friendlier freewheel output shaft with 9 and 10T sprockets.
  15. darwin

    darwin Well-Known Member

    Well for $129 for a brand new 49cc 4 stroke motor I'd take my chances with gasbike again. To me its just the nature of mabbing, if I can't keep it cheap then it isn't worth it to me. Keep in mind there's a difference between junk and cheap price. I've had nothing but good service from the HS 142f.