1000 miles, had fun, SEIZED

[ibdennyak]

I decided to go with a more reliable motor than the grewbee or the boygofast or even the other motors out there, I am going to surgically transplant a chevy 350 motor onto my bike, I must say the motor mounts will be tricky and the tire pressure will have to be taken up a notch.


just kidding.........

the truth is, the next motor I put in, I will not beat up by overreving f.o.t. all the time, the way I was driving would kill any motor. So I will take it down a notch, and maybe also buy an enduro motorcycle. But nothing beats a gas bike!!! People go nuts when they see it.

If I do come across a bullet proof motor, I will spread the word

thanks all

John

Shades of EJ Potter, the Ohio Madman. Actually the 4.3 (350 with two cylinders missing) would be a good choice. Same reliability and less weight.

 

[Fabian]

Hi c3po

This is what will happen to your big end connecting rod bearing if the engine is over revved or you just have a batch of bad bearing installed by the manufacturer.

http://www.motoredbikes.com/showthread.php?t=23865&highlight=failure+happy+time

Fabian

 

[AussieSteve]

c3po, check out:- http://www.rocksolidengines.com.au/
Tony sells a modified version of the HT engine that will work better and last longer. He also has a good range of performance products - billet aluminium high compression head, ceramic pistons, etc.

From his website:-

We do not know any other organization in Australia who disassemble motors and rebuild them before they forward the product onto their clients, Rock Solid Engines DO! That’s what we do for a living; we assemble and modify engine components.

Over-revving will kill his engines too, though, and WOT downhill is probably about the best way to do that.
... Steve

 

[gothicguy64]

Hello all,
I love gas bikes.
I was just about to embark on replacing the chain sprocket bearing (lots of play) this up coming week.
I noticed that the motor made more of a rattle, and more metalic noise, it seized up finally.
THE QUETION IS: did i abuse this motor?? most likely............... i did have it full throttle most of the time, went down long big hills full throttle, rpm'ed to the max, has anyone any experience in how to get the most life out of these motors. should i have limited myself to about 20mph.

the motor was cheap, 115$, boygofast, with standard rear sprocket.

thanks all

John

i presently have a rocksolid 49 cc hp1 with billett head an inlet ,poo poo street pipe an 44 rear sprocket
try lookin at rocksolid.com.au
with stock mod exhaust i get 64kmh
poo poo goes 55kmh
i live in syd
ohh i had a chainless bike but split rear rim
150 plus to repair .....
ohh a 40 is ideal for a 49
an 36 for a 66

 

[210061741]

Well to tell you all my experience.
A grubee GT-2B 48CC / Expansion Chamber / Porting / ECT.

Run this puppy hard as can be.
Prolly between 6000 and 8000 rpm all day.

Got about 2000 miles on it and my needle bearings are fine.

Took it all apart a wile ago. about 1500 miles.

Blew a crankshaft seal out 1 time and my 6202 bearings at the countershaft are due to be replaced.

The bearings are my fault cause i put the chain on way way to tight and damaged them.

 

[gregalman]

I ran a robin 33cc on a rack mount and used the throttle as an on off switch. That motor seemed to encourage wot all the time. Now I am running a 2 stroke china in frame and would not even consider the same type of abuse. At about 24 mph with the 44 tooth it starts to vibrate and so I never hold more than 23 mph for any length of time. If you want a motor you can abuse you may want to stop looking at the low end of the price scale. If you want to get long life out of the china motor just listen to it and it will tell you when it's being stressed.

 

[gothicguy64]

I decided to go with a more reliable motor than the grewbee or the boygofast or even the other motors out there, I am going to surgically transplant a chevy 350 motor onto my bike, I must say the motor mounts will be tricky and the tire pressure will have to be taken up a notch.


just kidding.........

the truth is, the next motor I put in, I will not beat up by overreving f.o.t. all the time, the way I was driving would kill any motor. So I will take it down a notch, and maybe also buy an enduro motorcycle. But nothing beats a gas bike!!! People go nuts when they see it.

If I do come across a bullet proof motor, I will spread the word

thanks all

John

hi mate ,
so far my rocksolid bike an motor have done 2270km an top of 64kmh ....
try rocksolid engines
they are in adelaide
i changed exhaust to poo poo street pipe an lost 10kmh
but it goes much quicker
ohh motor is the 50cc hp1 but with ceramic piston an billett head an inlet an motor is worked an ported with racin bearings
i run valvoline racin oil at 30 too 1 mix
only thing is i broke is plastic throttle handle ..cheap as
an rear rim is now split as i hit a pothole i didnt see on hume hiway
cant get a new wheel only replace rim or buy a std bike an exchange motor ... brad :helmet:

 

[happycheapskate]

re: original post/killed motor

I would say w.o.t. on the flats will not kill your motor if it is tuned right and not too lean.
It will eventually wear like anything though.

I bet your engine siezed from running lean and or excessive hit and piston slap caused by forced overreving of the engine. Probably a bearing lost its ability and put the vulcan death grip on your motor, or a piston ring deformed.

If the producer sells replacement parts, take apart the motor and see what the cause was. You may be able to repair it by replacing the bearing or ring and honing the cylinder. Luckily weeder motors just have a port and a reed valve, not cams or valve seats or springs.

If you can still turn the motor by hand or pushing the bike, try to repair or at least analyze it. Good luck.