Keep Blowing Pistons Plz Help

Hey Guys/Girls.

Heres the scoop, I recently bought a 99 Honda CR125R (1st bike) from a local shop ( which i had heard good things about) So i buy the bike, and when doing so he had told me yes new top end Wiseco piston bearings etc also that it had been broken in correctly. The next day my buddies n i had went out ridding, i was on the bike 3 hours: and as i was going up a hill in 3rd the bike kinda bogged out so down into 2nd. As i reached the top again the bike bogged n died this time. I kick it and it starts right up 1st try but as i let out the clutch it dies. I go to kick it yet again and i notice no compression at all. I call the shop explain what happened, i wasnt pining any gear ( first Bike) etc. Later that day i drop it off, tell theres no way i did this due to i know how to mix gas n was babying it. He told me i pay part he ll cover labor, said fine. I buy a better piston ( wiseco dom top ) well was told it was better. 200 bucks later and 9 days i get the bike back and the old piston, which was black and had scratches on it also miss shaped ( not full circle ) also thought with the miss shape it wasnt going up and down properly ( rod?) . i Have worked on cars for years  and knew well if i pulled this outta my Maro my walls must have been damage aswell. Na Na he said, Wall was fine and i installed new piston bearings etc. So i take the bike (with it fixed) load it up. Next day im out at the pit. As i was ridding down a normal trail 4th gear half throttle, the bike does the same *** !!! and after pushing 3 miles back to the truck, you can only image that i wasn't to happy when i called him at the shop. He had told me im doing sum thing wrong ( gas mix) which got the bike back with full tank n didn't even fill it. He wanted nothing to do with me or the bike he had sold me being this all happened within 12 days of buying it. When i came home that day i said hey i do cars motor is a motor, i have the owners man for specs. I start taking it apart as im doing so 1st time ya knw read read read take your time etc. Ok it comes off next thing i know theres a hole and if i was a perfect circle i could almost fit my pinky threw. I think it wasnt installed proper backwards we all make mistakes you know. So does anyone have any thoughts or what i should do about this ?????? thanks Rob  

I like to do my own work on my bikes if I have the time, which most of the time I do. It assures that the job gets done correctly or if something is wrong, I'm the one to blame. i do believe in helping local shops and giving them business but it sounds as if you have someone who doesnt really care to take care of their customers, he should be taking care of that bike for you.

Im interested in knowing what your ring gap was when he put hte new top end in. There is no way that the piston should be warping, your bike is running way to hot for that to happen, have you checked your radiator fluid? I would definately look into the rod and see if you have some up and down play or piston slap on the head. honing or resleeving that cylinder may be a good idea and just start out fresh.

Sounds like you kind of got burned, sorry man.  
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____________________
MIKE
Phoenix, az
(07 yz250)
(99 yz125)


Every bush has its day (sanders, 2009)
Lack of enthusiasm is for the weak and timid. (alex, a.k.a. yz250 forever)

"I know much about nothing at all"(Maple, 2009)

any pictures ?  
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"Every time I start thinking the world is all bad, then I start seeing some people out there having fun on motorcycles. It makes me take another look." -Steve McQueen

I have pics on my cell idn how to upload them to this site ? As for doing all the work myself, i think this just might be my 1st project. I have already talked to this guy out in PA that will re coat or sleeve my wall ($ 250 ). As for my bottom end i havent looked at it yet but i can image that if the piston was warped it must not have been going up & down properly. Rod? Crank? Bearings.And the coolant was 3/4 filled res topped off with water.I dont know much as of now. Only thing i know is the dude *** me over on this bike ( Country Cycles ) NJ.  

download them to photobucket.  get the code and bring it here.  hit reply to thread ,use the yellow square whit the moutain in it at the top of the reply page to upload pics.  
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"Every time I start thinking the world is all bad, then I start seeing some people out there having fun on motorcycles. It makes me take another look." -Steve McQueen

If you can get some pics I imagine we can help you walk through some of the process and give you some good advice. If we can't, the editors may chime in and give you some help as well. See what you can do about getting pics up. Resleeving is probably a good idea if your going to fix this and if yougoing to go that far, consider replacing the bottom end and start fresh.  
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____________________
MIKE
Phoenix, az
(07 yz250)
(99 yz125)


Every bush has its day (sanders, 2009)
Lack of enthusiasm is for the weak and timid. (alex, a.k.a. yz250 forever)

"I know much about nothing at all"(Maple, 2009)

http://s772.photobucket.com/albums/yy5/Freestyle0101/?newest=1 . and thank you guys already for the advice but take a look at the pics n ?  

http://s772.photobucket.com/albums/yy5/Freestyle0101/?newest=1  
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____________________
MIKE
Phoenix, az
(07 yz250)
(99 yz125)


Every bush has its day (sanders, 2009)
Lack of enthusiasm is for the weak and timid. (alex, a.k.a. yz250 forever)

"I know much about nothing at all"(Maple, 2009)

Holy *** thats bad...lol Seriously sold you a lemon of a dirtbike right there. That cylinder has got to need work and I would definately say your getting piston slap. Rebuild that engine freestyle, split cases and replace top and bottom. Hope that all helps man.  
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____________________
MIKE
Phoenix, az
(07 yz250)
(99 yz125)


Every bush has its day (sanders, 2009)
Lack of enthusiasm is for the weak and timid. (alex, a.k.a. yz250 forever)

"I know much about nothing at all"(Maple, 2009)

i would destroy the guy who sold u that bike.  A bike that has a replaced top end when u buy that shouldnt do that..... well if he did the work on your bike i think he should pay for the whole cost cause its his mess up for the first time but definatly the second piston should be his problem he installed it.  The shops i go to are really good if they do something that messes up a bike they fix it for free cuz they messed up.  Y should u have to pay if you didnt do anything wrong.  I think thats wrong that the shop allowed that to happen,  A mechanic and a rider need to have trust they guy who works on my bike races with me at the races i go to.  He does good work and i trust him thats how it should be.  
IBEW LOCAL 697 1st year apprentice,  fuels my passion of riding.

looks like a big chunk of the piston shattered....there was some major problem that caused that....the shop replaced the piston so they are ultimately responsible if they had that engine apart and put it back together without checking everything else....with damage like that they cant just say it was your fault like you were doing something wrong because if you had mixed the gas wrong the engine would have just seized....obviously that isnt the problem with your piston...if i was you id take it to another shop and just diagnose the problem and say what went wrong and wrtite all down and then you take it back to the shop you bought the bike from and tell them if they dont fix it..parts AND labor....then youre going to sue them for the cost of the bike  
1978 Yamaha 175 MX
Northern Ontario
Canada
31 yrs young
WHEELIES!
Yaaaayyyyyy!

What does your spark plug look like?  Also, are there impact marks from pieces hitting the head etc?  

What pre-mix ratio are you using?  

The fact there is a hole; you need to make sure there are no small pieces of aluminum down in the crank area or it will likey do this again.  
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Dave H 2006 YZ250
(2008 YZ 125 son)

Well the shop i took it to was the same shop i bought it from ( Country Cycles ) NJ. Spark plug i pulled out now is a lil black but i was their when they were so called tuning it n they blew one then put the one i have in their now ,as for the mix was 32-1 Only Bel ray was used since i bought it tho only have maybe 4 hrs on the bike between 2 pistons first one was 3hours 45min second one was the rest, i put my 1st piston on photo bucket. I have looked at nything besides taking the head off i was planing on taking it to a shop maybe motoX or sun cycles both 15mins away from me. Go their tell em whats up n hey listen i just want you to tell me what happened n why. Was it installed rite, jet work specs, Rite MM piston etc . Those are my plans as of now should happen within a wk or so. A part i  left out about that crappy day  was as i  was walking back i saw a cop between me running with my bike in sand or drop n run na i just keep walking and he stopped and gave me a MV on private prop, think up to 250 or 500 fine maybe driving lis 3 to 6 months.  

you were pushing the bike? if the vehicle wasnt running and you were pushing it then how can he charge you?? id fight that in court  
1978 Yamaha 175 MX
Northern Ontario
Canada
31 yrs young
WHEELIES!
Yaaaayyyyyy!

That hole in the piston is where the aluminum was burned away. That has nothing to do with the mix or anything. Either the jetting is super lean, fuel is very poor quality or the engine has an air leak. It does sound like time for a full rebuild. Bummer about the ticket as well.