HASTY Posted October 28, 2004 Report Share Posted October 28, 2004 (edited) could someone help me with the posssible cause to these pic's . Edited October 28, 2004 by HASTY Quote Link to comment Share on other sites More sharing options...
HASTY Posted October 28, 2004 Author Report Share Posted October 28, 2004 this has only happened on the left side ,this is looking up the exhaust port Quote Link to comment Share on other sites More sharing options...
NYUK Posted October 28, 2004 Report Share Posted October 28, 2004 what kind of piston? Quote Link to comment Share on other sites More sharing options...
fixitrod Posted October 28, 2004 Report Share Posted October 28, 2004 http://www.mztech.fsnet.co.uk/workshop/wrk_piston.html This page may help. I'm having a hard time with the pics Quote Link to comment Share on other sites More sharing options...
rebelbanshee2 Posted October 28, 2004 Report Share Posted October 28, 2004 could someone help me with the posssible cause to these pic's . bad lighting? Quote Link to comment Share on other sites More sharing options...
HASTY Posted October 29, 2004 Author Report Share Posted October 29, 2004 thanks rebelbanshee2 i was about to go on a two day trip when i decided to change the O rings on the exhaust because of a little leak ,just happen to look up the port and f*ck me,look at that !.on my back with torch and camera trying to get pic so i can get some sort of help and all i get is bullshit answers like yours Quote Link to comment Share on other sites More sharing options...
HASTY Posted October 29, 2004 Author Report Share Posted October 29, 2004 after now getting the top off (rebelbanshee2 ) we can see better, any clues? have a shaved head and advance timing plate,thought it might be detonation seizure before because i'm running standard pipes and it might have got hot ? but why only one side ??changed main bearings 6mnths ago, thought seal would last longer !stator side.left hand carbie top still tight ! now cannot up load pic like the last one because it cannot up load this type of file ERROR<ERROR WAS FOUND Quote Link to comment Share on other sites More sharing options...
itsaripper Posted October 30, 2004 Report Share Posted October 30, 2004 The problem is on the edge of the piston, at the exhaust? If there is a hole in the middle of the piston that would be detonation, caused by high compresson with low octane. If the edge of the piston is ate off and looks scuffed like your picture. The biggest culpret would be heat. With hot weather and running hard the piston doesn't have time to cool off. You also said this only is on the left side. That says your crank seal was leaking, leaning out and running hotter. Also look at the intake boot to see if there is any cracks. Or the seal on the reeds to could be leaking. With a two stroke there can be two or three things contributing to the problem all at once. Like not enought oil in gas, low octane, high compresson, air leak, or somthing restrickting the gas going to that sides carb. If you just rebuilt the motor did you make sure the end gap on the rings was .012 to .018 ? I could go on, but check these out and get back if you still can't find anything wrong. Quote Link to comment Share on other sites More sharing options...
svtkid78 Posted October 31, 2004 Report Share Posted October 31, 2004 Hasty, you have people trying to help you, but calling people out saying they are giving B'S answers isn't right. Stop taking B'S photos for us to look at and you'll get a non B'S answer. Take the cylinders off the pistons and take another photo. Then we can tell you what the problem is. Quote Link to comment Share on other sites More sharing options...
svtkid78 Posted October 31, 2004 Report Share Posted October 31, 2004 You can tell from it though that your rings are completly frozen and are not able to expand at all. Looks like the ring lands have closed down on them as a result of heat. Looks like your minor air leak may have not been so minor. Quote Link to comment Share on other sites More sharing options...
rebelbanshee2 Posted November 1, 2004 Report Share Posted November 1, 2004 sorry but i cannot even tell thats an engine from the picture. Before you took it apart you should have done a leakdown test. I guess you could put the head back on to see if the crank seals were leaking. If the melted spot is in the middle its pre-detonation. if its near the exaust port its a lean condition. scuffs on the side could be a cold sieze..... Quote Link to comment Share on other sites More sharing options...
HASTY Posted November 30, 2004 Author Report Share Posted November 30, 2004 my apologys to those that thought i was a bit agressive in my behavior,i had a pisser of a day and am now over it, i am replacing the crank seal ,maybe it was due to extreme advance on my timing (new timing plate ,stator,from ricky!!! yer go ricky)did not change jetting from standard.also got stock pipes ( not letting heat escape maybe ?)also the top of my LH carby i've being having trouble with.(getting TORS removal kit) not sure if i should go single carby ? also the exhaust ports are worn around the o-ring seating area,so i need to fix that also!. i'd like to thank you guys for your input and ideas from what i read. it seems to have been a combination of things.lean fuel maybe, detonation due to the damage done to the top off piston (advanced timing ?) cold seizure maybe due to exhaust leaks ? any way putting it back to gether as best i can and hope it runs again Quote Link to comment Share on other sites More sharing options...
Big Blue Posted November 30, 2004 Report Share Posted November 30, 2004 Cold seziure is from not letting the bike warm up properly before riding, are you putting new pistons in and what about a boring it? or just honing it maybe? i would say that it leaned out though. Quote Link to comment Share on other sites More sharing options...
HASTY Posted December 1, 2004 Author Report Share Posted December 1, 2004 Cold seziure is from not letting the bike warm up properly before riding, are you putting new pistons in and what about a boring it? or just honing it maybe? i would say that it leaned out though. 286786[/snapback] i'm just replacing the one piston , this will be ok yer ?with a little hone,not much damage to cylinder Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.