shredded piston

m8, yopu aint riding that monday.

the rings are now fucked. it was worn, youve ragged it with worn rings, this has probably scored the barrel beyond belief.

strip it, replace anything marked. if its not running right dont ignor it nexxt time. easy really.. if it aint broke dont fix it, if it is broke dont ignore it!!

 

guessing its air cooled, if so check the fan covers are in place/not broken, there are no air leeks, no build up in the exhaust.. just sounds like the rings were worn an youve ignored it, fucked the piston against the wall of the cylinder) this causes lots of heat, causing a sieze, new rings barrel an piston (forget a rebore) an it should be fine.

jus check the oil seals arnt weaping now that i think of it.. did it sound atall funnny at idle? or just completly normal dindt want to rev then went bang?

 

if the electric start wasent enough to start but it would go wiht a hard kick an a bit of throtle yet faild to idle then ye, you wore the rings badly.. whip it off, take some pics of the side of the piston an the cylinder wall and ill tell you why it blew

 

prittyy simple... if you cant figure out simple running issues or identify problems/failures why are you porting barrels?

 

it was a question m8, your taking it the wrong way as you fel in the wrong for playing..

i was meerly saying fine, do what you like with your bike.. but should you be atempting things like this (even under instruction) if you dont know how to listen to the bike... this well respected tunner from holland, did he listen to the bike down the phone an tell you you did it right? i remember your post about this... an that info could have come from ANY minimoto website (if you read back i even said its all well an good people passing around majic fformula's for barrels.. it AINT that simple)

im trying to help.. to be a cunt would be to simply iognore this thread... whip it apart.. the learning process begins. get some pics up, ill tell you why i think it faild. could well just be worn rings (what i been saying)

would you have a dentest do a tripple corinary bypass? no... and why? not because he doesent understand the procedure... more the fact he has never done it wrong so when the shit hits the pan its clueless city...

get it apart, have a look, we will help. i might be a cunt 99% of the time. but im helpfull 99.5% of the time with it so hey. im ALL for people trying/learning to port. you HAVE to expect failures tho.. this sounds unrelated all the saem, just seems strange for you to be working on a barrel, yet asking questions about somthing as simple as obviously worn rings, ignoring this fact (on your ported barrel) blowing it up then wondering why..

as for the people who helped me? who was that then? im self taught. didnt read a single manual for the first few years, then i fucked up hundreads of engines throughout my childhood...slowly learning what i was doing wrong. THIS is how i learnt. and it took ALOT longer than it would have if i could have just asked... so ye, dont jump to the conclusion im trying to strikje you down. im only trying to help..

 

generally, if your doing miles on an engine do what ive started doing (just cant leave anything alone see) grab a spare engine.. have it literally ready to sling in the bike (wheel on, pipe on, everything) then its 2 bolts a brake a couple wires and simply dropping it in place (i run premix wich makes it alot easier for engine swaps, altho in any case the carb can stay in place, just remove the oil pump and carb intact from the bike)

this way you can play all you like, get home wiht a broken bike, do an hours work an drive to work tomorrow. then fix the engine when your not swearing throwing things and "really in need of this bike for work" i found by rushing/doing things i know were wrong to "jus get me to work" its cost me alot more in the long run.. havent even needed the spare engine yet, but you get the idea

 

weather is glorious where i am, hasent been wet atall in 3 days now (as in dry roads, cold air, no wind and sunny blue sky's... ie perfect riding conditions)
LOVIN it