Top End Rebuild, Need Help!
- Thread starter Brenden
- Start date
You look like a proud new uncle
Make sure the bottom end checks out, if it needs attention, do it now.
There shouldn't be fluids in the crankshaft! I think you mean the gearbox, trannsmission, clutch case.
Take a good bright flashlight and look down in the crankcase. look for pieces of metal. Inspect the crank for up and down play(you don't want any), and no more that 3mm side to side play.
If you find stuff wrong, rebuild that crank if its a OEM yamaha one, buy new main bearings and seals, and freshen up that bottom end. then you have a good fresh Motor that you will be able to enjoy for quite awhile.
That piston looks like it has suffered one of three things.
Lubrication loss.
Dirt ingested through the carb.
Not enough warm up time.
Lubrication loss.
Dirt ingested through the carb.
Not enough warm up time.
I think you may hit the nail on the head.
I cringe every time I see someone hop on their smokers, kick and rip.
if you want to get ghetto find a magnet that will fit and or tape a straw to vacum and suck...
un offficial way resume at your own risk
un offficial way resume at your own risk
the onlything in the crank is 2 stroke oil and gas it is ok...
if it was a 4 stroke then it would be gear oil
the transmission is seperated from the crank cylinder,piston ect
not sure what piston that is but it looks like a wiseco which you need to let it warm up longer.although it dont matter know it is toast
if it was a 4 stroke then it would be gear oil
the transmission is seperated from the crank cylinder,piston ect
not sure what piston that is but it looks like a wiseco which you need to let it warm up longer.although it dont matter know it is toast
Yeah I think the issue was just that the previous owner (and me also, I only drove it twice) didn't warm up the machine before running it...I've never owned a two stroke?? What's the best way to break it in after the rebuild and from there how long do I let it warm up??? So like a month from now should I let it warm up before riding for like 10 minutes???
It is fine to see oil in the bottom of the crankcase!
You are going to have to split the cases to remove the debris, as I do not think you are going to find a magnet that attracts aluminium, or a straw that will fit into a bearing.
Warm up should be as long as it takes the engine to get to operating temperature, occasionally blipping the throttle.
After rebuild, leak test, 3-5 heat cycles, 2 tanks of fuel at no more than 3/4 throttle!
You are going to have to split the cases to remove the debris, as I do not think you are going to find a magnet that attracts aluminium, or a straw that will fit into a bearing.
Warm up should be as long as it takes the engine to get to operating temperature, occasionally blipping the throttle.
After rebuild, leak test, 3-5 heat cycles, 2 tanks of fuel at no more than 3/4 throttle!
Alright thanks
like I've said I've never owned a two stroke so I didn't realize how much warm up time and stuff there is
Not trying to be smart, but how long is a bit of string or a ditch.
It all depends how fast or in what gear!
It all depends how fast or in what gear!
Every infernal combustion should be given the opportunity to warm up.Alright thanks
Excessive wear occurs to a cold engine.
