Hi new to motorised bikes -need tips

BAZZA614

Member
Local time
8:40 AM
Joined
Mar 6, 2013
Messages
61
Location
Australia
Hi I'm very new to motorised bikes and you might be able to see that I'm only 12 years of age nearly 13 in August. I put the kit together by my self as who I live with don't know much about Motorised bikes. I took the cylinder wall off (not knowing the consequences) and snapped my piston rings. I bought another 2 and trying to put them on snapped them again and dropped half of a piston ring into the crank shaft. Anyway left it and got 2 more piston rings. I Put them on successfully and got the rest of the bike finished. After 20 minutes I got the thing to finally start it went great making sure I didn't go over 20 kph. The petrol mixture was 16:1 and now I have quite a bit of oil in my exhaust pipe. Today I went to ride it and I had to peddle alot to get it started just like last time but it was worse. Finally got it start but had hardly any power. I heard clicking noises (broken piston rings move inside crankshaft) then it's cut out and came to a sliding halt. My knee touched the motor and it was burning hot ,so hot when my knee rubbed against the motor I could hear it sizzle my skin. Any help would be appreciated on anything and help on how to get the old piston rings out of crankshaft area (without taking the motor apart) would be greatful. Also I have changed the spark plug as thatnwas gonsikis(broken).
 
Last edited:
Your engine will be a complete mess - there isn't any nice way of saying it.
Better to just buy a new replacement engine because if you try and fix the engine, using methods that caused the stuff-up in the first place, the outcome will be nothing less than a hugely spectacular stuff-up; not even recreatable by a Mythbusters team effort.
 
Education is expensive, be glad you screwed up a $ 100 China Girl, not a many thousand dollar complex motorcycle engine !

Even though your engine is busted, it's not junk. Pull it apart ' alien autopsy ' style and marvel at your new parts collection,
covers, mag, clutch . The knowledge and parts gained will take the sting out of replacement. Know any Dirt Bike Guys ? They should know all about 2 cycle top end jobs. Muffler Shops can be a good source for welding brackets, and ' persuading ' tubing into place.
 
and marvel at your new parts collection

I agree, he will have a new parts collection but the process of pulling the engine apart without any knowledge of how to do so in a planned and methodical manner (and without suitable tools) will make it nothing more than a "scrap metal parts collection"
 
There is no way of putting a sugar coated spin on this.
If any salvageable parts can be saved, they will soon take on all the qualities of scrap metal (it's a certainty); just give it a little time with a hammer and flat blade screw driver for predictable results.
 
Hi everyone thanks for being honest and every thing I took the motor off qand cylinder wall carbe and exhaust.believe it or not the broken half of the piston fell out (after moving piston around). I also found that the piston smashed a bit of the wall. If i was to get a new piston wall, would I get it up and running?
 
Last edited:
Can anyone tell me why the motor was so hot and why there was so much oil in the exhaust? Thanks in advance
 
Short and sweet: just buy a replacement engine, bolt it in place and be done with it.

By asking the questions you are asking in your previous post means that the above sentence will be the best course for the least amount of trouble.
From this point forward, the best method of education is the Socratic method. Study the information in the links below and you will be able to answer your own questions:



http://edj.net/2stroke/jennings/oilpremix.pdf

http://edj.net/2stroke/jennings/higher_compression.pdf

http://edj.net/2stroke/jennings/do_you_really.pdf

http://edj.net/2stroke/jennings/crankcase_volume.pdf

http://edj.net/2stroke/jennings/aspirin_takers.pdf


and


turn your monitor 90 degrees for this one:

http://edj.net/2stroke/jennings/2stroketunershandbook.pdf
 
I say as long as the cylinder above the exhaust port isn't gouged then clean it up and use it!
If the cylinder is gouged (grooved) then just buy a replacement cylinder.
If the piston is broken then replace it.
I have used grease on the flywheels, rotated them, for the loose stuff in the crankcase to come out.
Also I have taken the engine off, taken the whole thing off the bike, then poured gasoline into the crank/flywheel area, rotated the crank if at all possible, and then poured it out into a pan so I could see if anything came out.
You are quite the small mechanic attempting this kind of repair at such a young age. Keep it up and you'll be an incredible mechanic when older!
 
Back
Top