Why i wanna cry

[imprezkid]

So hears the story

Last fall i rebuilt my prox cylindered(i believe) 330. The works piston, rings, gaskets, bore, etc. Got it broke in running pretty good nothing spectacular, but it was still new. So after having a few hours on it i went up to a Iowa state university event called cytrax where we race around a track on pavement and haybales, ran good. WEll a dyno showed up and i couldn't pass it up. So got on the dyno and after 3 trys of his equipment messing up he had it going and then boom, bolt sheered off out of front sprocket, chain came off, busted the case saver and that was done. So few weeks later finally got a chance to fix it, put a new bolt in after retrieveing the broke one, new chain and slidder. So a week later went to a track and well after riding for a few minutes i noticed something was wrong, like my chain was loose and slipping, so i went back and tightened it up, well turns out it was really 3rd gear grinding away, so i thought okay this sucks, drained the fluid, no shavings. Well i started it a while later to bring down to the house and after getting it down in the garage i went to start it again and no compression.

So tonight i finally tore it apart, my brand new piston is ruined, sleeve is probably done, dome done, who knows what the bottom end looks like. Shavings stuck a ring and put a few nice lines down my sleeve. Idk whats all broke, im pretty new to 250's and engine work in general. BUt im sad now, and don't really know what to do. Its at least half my fault, my dad says the guy strapped it on the dyno wrong is why it sheered like that, but anyway.

Sorry for so long, but i had to vent

So a few questions,
who resleves? is this the right option
Are there good sleeves and bad sleeves?
effect porting?
What years are the best bottom ends?
i have a black bottom end, which i believe means its a later one. but the one i have now is polished so idk what year it is ill check the vin

[imprezkid]

Well after that im now better and looking forward to bigger and better things, not to mention learning a valuable yet expensive lesson.
I know everyone loves pictures!
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[LONG-ROD]

dude, looks like you that thing really lean, did it have new crank seals in it, what jetting where you running, did you do a preasure test on it, did you heat cyle it to break it in, and what compression does it have, and whatoctane fuel where ou running

[2-330s]

why do you think you need it re sleeved?that sleeve looks pretty thick how big was your piston? where did the metal come from? the trans and crank are separate. the dyno had nothing to do with your motor going. if anything it would be your jetting,a air leak or bad part (bearing,ring,piston,ect)

[thedeatons]

There is an engine on Ebay.....

I agree, the dyno straps simply hold it in place. This could have happened going down a dirt road. Probably better on the dyno because at least it didn't lock the quads tires up and throw you over the bars.

[imprezkid]

Well like i said im pretty new, i don't think it leaned out, and it didn't lock up obviously, just no compression what so ever.

I was running a 178 main i believe. Premium mixed 40:1. Don't know what size the dome is.

I'm not sure on the compression we took it to a guy right after rebuild and he tweaked it(long time flat tracker, that races a 310pv) ran pretty good. Actually after a few weeks i blew the bottom cylinder gasket out of it, and thankfully noticed it, took the motor apart(looked fine) and reassembled.

No crank seals felt good so we just left them.

DIdn't pressure test it.

Was broke in properly.

Believed to be a 330 on second bore. BUt its got some good sized cuts up and down the walls where a few shavings got stuck on the rings. Anyone can tell if it has any porting, or just a stock prox?

I thought about that last night after reading the post that the trans and crank are seperate, so idk what came apart. I do know that i did a lot of things wrong with it though, so i'm gunna get my act together when rebuilding it.

[imprezkid]

i will say though, never ran as hard as when i got it. My dad and i never could figure out why

[CoDean45]

I'm gonna put my 2 cents in and say it was either way to lean or it ran hot. Check your water pump and make sure it doesn't have any broken fins and the bearing is still good. Check your radiator and make sure it isn't clogged up.

[skyhighatv]

Looks to me as if the lower rod bearing let loose,you shouldnt have to resleve the cylinder but its time for a new crank and bearings thats for sure.

[LONG-ROD]

there is no way to tell if crank seals are good by looking at them. I would say you deffintly ran it lean, bad crank seal, stator side, or base gasket gave out, always do a preassure test, always!! that and pump gas on a motor that needs more.

[wolly_80]

ill put my 2 cents in it is posssible that the oring for the head gasket was leaking air or anti-freeze into the motor i had the same problem on one of my quads already with the samre type of damage resulting in it

[imprezkid]

My plugs were always wet or light brown, like i said i had a guy tune it that runs a 310, he said after running it a bit longer i could go down to a 175 probably, so again i don't know for sure but i don't believe it ran lean.

Can anyone tell if any porting has been done to the cylinder? If not would it be worth it to have it done, or can it even be done?

[LONG-ROD]

ellyou would no best if it ran lean, is tere any up anddown play in the crank rod, 40:1 is not good to ru, se will disagree, but look at your motor, I wouldf say if not a lean conditionand the crank is good it was predetinateing.

[skyhighatv]

If you look at the pics of the piston and dome you can see the chunks of copper(or what ever it is)from the race of the lower rod bearing. Same thing happened to one of my motors a while back.

[imprezkid]

Yeah the rod is real loose. Can anyone tell if its had some porting done or not, i don't have a clue when it comes to p&p

[imprezkid]

bump for porting? I've also learned some more about the motor, its a 86-87 bottom end with a long rod in it, not a bolt on topend, cases are ported. Also noticed that someone has spent some time on the rod, its been ground down so its smooth on both sides and polished, anyone know who does this?