engine siezed - fix or replace?

GoldenMotor.com
JdubMotorMan

JdubMotorMan

New Member
May 9, 2011
41
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los angeles county
Hey guys, I stuck to the maintenance schedule exactly as recommended in the owners manual including proper oil and gas mixing and yesterday on a short ride my motor completely siezed up .... should I attempt to take it apart and try to fix it or just call it a loss and eventually purchase a new motor?
 
O

oldtimer54

Member
May 15, 2010
540
6
18
On a bike
I would take it apart and at least see, whats the worst that could happen and youll get to learn something. A new motor should be about $80 shpped so not to bad. Let us know how it goes.
 
JdubMotorMan

JdubMotorMan

New Member
May 9, 2011
41
0
0
los angeles county
oldtimer54 said:
I would take it apart and at least see, whats the worst that could happen and youll get to learn something. A new motor should be about $80 shpped so not to bad. Let us know how it goes.
Click to expand...
I actually just got off the phone with the guy and he said send it in with $60.00 and they'll send me a new one... other than that, where can I buy just the motor brand new?
 
DaveC

DaveC

Member
Jul 14, 2010
969
1
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Boise, ID
Very much depends on why it seized. Does the piston still turn now that it's cool'd down? You'r going to have to tear it down to find out. Waaaaay too much could be wrong, some things are repairable and some turn the motor to junk.

I have a 49cc that's never run:bad magneto coil, that I was going to list in the yardsale section but I'll give you first shot at it for $50 shipped. It will need the magneto coil and bucking bar in the clutch from your old motor but like I said, I bolted it to my frame and tried to get it to fire. Ran the tests and discovered it was the magneto coil. I'll even send it with a NGK B6HS installed, well, in the box. brnot

I have a 66 cc I'll be selling, too, but it has major bolt-ons. There are ...."things" on it unavalible from anyone. That one I will have to list in the yard sale. So many up-grades the sum of the parts way exceeds the cost of the motor. I'll be listing it at about 50% of what I have into it.:-||
 
rohmell

rohmell

Active Member
Jun 2, 2010
1,531
6
38
New York
A whole engine is $80 + $16.99 S&H = 96.99
If you send in your old engine + $60, this means that the engine is worth $36.99.
The old engine has the crankcase halves, magneto, magnet, clutch parts, that if bought separately would easily exceed $36.99.
I would keep the old engine for parts/rebuilding and a learning experience, unless you're hard up for loot.
 
DaveC

DaveC

Member
Jul 14, 2010
969
1
18
Boise, ID
oldtimer54 said:
Thats your best deal but boy goes fast sales just the motor.
Click to expand...

The 49 cc I described IS a BGF motor. So is the 66 cc.

Broken is the natural state of a Chinese motor. The need for constant repair and the necessity of a parts warehouse has soured me on the HT boat anchor.
 
rohmell

rohmell

Active Member
Jun 2, 2010
1,531
6
38
New York
BiMoPed said:
BoyGoFast no ship to California. It's those C.A.R.B. regulations.
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BGF's warehouse is in California, and he can't ship to California. Yet the kits can be shipped to him in California from overseas.

I tell you, the laws are all effed up.
 
MotorBicycleRacing

MotorBicycleRacing

Well-Known Member
Jul 28, 2010
5,844
109
63
SoCal Baby!!!
www.facebook.com
rohmell said:
BGF's warehouse is in California, and he can't ship to California. Yet the kits can be shipped to him in California from overseas.

I tell you, the laws are all effed up.
Click to expand...
Yes, CARB is a out of control non elected CA agency run by
a crazy lady that doesn't care if CARB regs mess up CA.
CARB = CaliforniaAirResourcesBoard

Huh? Having non CARB motors in a CA warehouse is one thing.
Selling them to a CA user who is going to run the motor in CA
is quite another.

GasBike aka KingsMotorBikes is also in Van Nuys CA and they
don't ship to CA either.

The fine for them would be large.

These Chinese 2 stroke bicycle motors will never be CARB approved.

Only CARB approved motors that we use on bicycles I can think of are
Honda GX 25, 35 and 50 cc
Robin Subaru 25 and 35 cc
Harbor Freight 79 cc and larger 4 strokes

Harbor Freight 2 strokes
Tanaka Purefire
Mitsubishi
 
JdubMotorMan

JdubMotorMan

New Member
May 9, 2011
41
0
0
los angeles county
DaveC said:
Very much depends on why it seized. Does the piston still turn now that it's cool'd down? You'r going to have to tear it down to find out. Waaaaay too much could be wrong, some things are repairable and some turn the motor to junk.

I have a 49cc that's never run:bad magneto coil, that I was going to list in the yardsale section but I'll give you first shot at it for $50 shipped. It will need the magneto coil and bucking bar in the clutch from your old motor but like I said, I bolted it to my frame and tried to get it to fire. Ran the tests and discovered it was the magneto coil. I'll even send it with a NGK B6HS installed, well, in the box. brnot

I have a 66 cc I'll be selling, too, but it has major bolt-ons. There are ...."things" on it unavalible from anyone. That one I will have to list in the yard sale. So many up-grades the sum of the parts way exceeds the cost of the motor. I'll be listing it at about 50% of what I have into it.:-||
Click to expand...
thanks Dave , I actually took it apart and found the piston arm was bone dry so I oiled it up and put everything back together and got it running... now I just need to figure out what the loud rattling sound is coming from the motor when I rev it up ... any ideas ?
 
D

Drewd

New Member
Jul 25, 2008
425
0
0
Colorado
jdub,
what were the engine operation parameters when it seized? did you warm up engine a little before going to full throttle-2 strokes can cold seize.

how much oil mixture ratio and what type are you using? i strongly recommend 32:1 using klotz supertechniplate or maxima 927....no more or less for now.

pull the head and check to see that the pins in the cylinder that prevent ring rotation are secure...sometimes they pop out and get spit out the exhaust and then the rings rotate and catch on a port.

some more info would be appreciated. also check idle mixture by starting engine then closing the fuel valve and see how much it speeds up. it shold speed up 200-300 rpm just before it dies...if it sounds like it is speeding up a lot you are too rich and if it speeds up or doesn't speed up at all you may wish to lower the e-clip on the needle valve one notch to richen the mixture.
 
JdubMotorMan

JdubMotorMan

New Member
May 9, 2011
41
0
0
los angeles county
Drewd said:
jdub,
what were the engine operation parameters when it seized? did you warm up engine a little before going to full throttle-2 strokes can cold seize.

how much oil mixture ratio and what type are you using? i strongly recommend 32:1 using klotz supertechniplate or maxima 927....no more or less for now.

pull the head and check to see that the pins in the cylinder that prevent ring rotation are secure...sometimes they pop out and get spit out the exhaust and then the rings rotate and catch on a port.

some more info would be appreciated. also check idle mixture by starting engine then closing the fuel valve and see how much it speeds up. it shold speed up 200-300 rpm just before it dies...if it sounds like it is speeding up a lot you are too rich and if it speeds up or doesn't speed up at all you may wish to lower the e-clip on the needle valve one notch to richen the mixture.
Click to expand...

Hi Drewd , thanks for the tips. Unfortunately I didn't warm it up yesterday I just started to go. Usually I warm it up for a little bit . Also , I wanted to make sure the engine was getting lubed really well so there is a lot more oil than normal in there right now causing plenty of white smoke and a slower response with the engine power. I will have to pull the head again. I also noticed that the nut that holds the large gear in place is cracked and needs to be replaced and the large gear wiggles more than it probable should ... at first I thought it was a bearing but now I don't think it is ... the oil I am using it synthetic 2 stroke oil from Home Depot by the chainsaws. I'm actually going to switch to Opti-2 if I can get it running again... I'm on a huge budget right now , so whatever happens , I have to do it myself lol , all advise and tips are welcome though
 
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