pauls320 Posted November 13, 2018 Report Share Posted November 13, 2018 Judging from your first pic, the top of your piston looks like its been smashing bits of metal between it and the head...possibly bits of con rod or main bearing debris or even a lost wrist pin clip?? Pic also has your piston ring rotated around and overlapping the pin, which it should not...maybe its fallen out? You might want to look at taking it to a reputable shop. Hope you get rolling again soon Quote Link to comment Share on other sites More sharing options...
d2w Posted November 13, 2018 Report Share Posted November 13, 2018 I too noted that texturing around the the piston top (but not on the top of the crown). Would that area correspond to the "squish zone" (and so little clearance between the head and the piston)? It sure looks like something was being driven into the piston. Alexdukes ... Do you have a picture of the (underside of the) head? Quote Link to comment Share on other sites More sharing options...
Alexdukes Posted November 13, 2018 Author Report Share Posted November 13, 2018 I do, see attached. I think the guy said it was a new piston. The problem is, i live in the countryside info France, reputable garages are few and far between, so some amazing guidance on how to move forward with my own two hands would be amazing!! Thanks guys so far Quote Link to comment Share on other sites More sharing options...
trapezeartist Posted November 13, 2018 Report Share Posted November 13, 2018 Yes, the piston marking on the crown matches the squish area. Its hard to tell from the photos if that marking is due to debris getting smashed between the piston and head, or bad detonation occurring in there. If you only ran the engine without oil for a short while, that may not be the cause of the problem and is just serving to confuse us. I certainly don't think the ring area of the piston looks healthy. On the other hand there doesn't seem much wrong with the bore in the photo, but I think it needs to be inspected carefully and measured. Quote Link to comment Share on other sites More sharing options...
Alexdukes Posted November 14, 2018 Author Report Share Posted November 14, 2018 After further conversation with my son, he has said he has probably run roughly 2 tanks through the engine without oil! I nearly crucified him! So am i looking at trying just new rings as evrything else looks vaguely ok? Or new piston aswell? Need to get stuff ordered as everything takes a dogs age to be delivered in France!! Quote Link to comment Share on other sites More sharing options...
lineaway Posted November 14, 2018 Report Share Posted November 14, 2018 Blowing the pictures up, there is alot of small specs everywhere which usually means the rod bearing. Especially with that amount of time with no lubrication. If not the rod the mains could be the culprit. I would not just throw a piston in without some thought into what all is wrong. Quote Link to comment Share on other sites More sharing options...
d2w Posted November 14, 2018 Report Share Posted November 14, 2018 I'm sorry for Alexdukes situation, but I'm eager to learn from it as well. If a (connecting road and/or main) bearing "went", how would one assess that? What would you "feel" when moving the crank through its stroke? Would it grind or stick or ... ? Quote Link to comment Share on other sites More sharing options...
Alexdukes Posted November 14, 2018 Author Report Share Posted November 14, 2018 Thanks guys, Thanks d2w, yes, as i am fixing this myself, i need some guidance of what i am looking for? Quote Link to comment Share on other sites More sharing options...
oni nou Posted November 14, 2018 Report Share Posted November 14, 2018 1 Quote Link to comment Share on other sites More sharing options...
lineaway Posted November 14, 2018 Report Share Posted November 14, 2018 39 minutes ago, oni nou said: Really no opinion? Ha, Ha! 1 Quote Link to comment Share on other sites More sharing options...
lineaway Posted November 14, 2018 Report Share Posted November 14, 2018 Hard to fix a bike on the internet. Luckily the Pro motor lubes the mains by the transmission oil. The rod can be checked for vertical movement, Should be no up and down play. They always have play sideways. The crank should spin freely, but you are turning the flywheel and clutch basket. It really should have the lower end flushed out. If you go any farther the engine can be removed without removing the skid plate. Good luck. Quote Link to comment Share on other sites More sharing options...
oni nou Posted November 14, 2018 Report Share Posted November 14, 2018 21 minutes ago, lineaway said: Really no opinion? Ha, Ha! That in depth step by step how- to for a person who has zero knowledge should be of enormous help. Ha Ha. ........It will have to be answered by section swept he is the one who can be bothered to type up more than a couple of sentences at a time HaHa. 1 Quote Link to comment Share on other sites More sharing options...
lineaway Posted November 14, 2018 Report Share Posted November 14, 2018 Actually google Jim Snell video`s on you tube. That will at least have you familiar with the motor. Yeah, if you get Section Swept and Oni nou bantering. At least everyone will be amused. Quote Link to comment Share on other sites More sharing options...
oni nou Posted November 14, 2018 Report Share Posted November 14, 2018 2 minutes ago, lineaway said: Actually google Jim Snell video`s on you tube. That will at least have you familiar with the motor. Yeah, if you get Section Swept and Oni nou bantering. At least everyone will be amused. As you well know lineaway I only ever do anything to amuse myself. .....Keep up the good work don't worry I will not be giving any more opinions... poor old Nigels ego gets bruised. 1 Quote Link to comment Share on other sites More sharing options...
d2w Posted November 14, 2018 Report Share Posted November 14, 2018 Alexdukes ... Just some basic questions ... What do you see in the oil when you drain it? What kind/size of debris is stuck to the fill and drain plug magnets? I believe that diesel fuel is a safe solution to use when trying to flush debris from an engine. Quote Link to comment Share on other sites More sharing options...
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