DirtyToes

so i'm gonna start by saying...**** my life

fresh oil(1 gallon of 20/50), fresh filter, stuntex oil pikckup, no pipe, just straight headers.

rode 10 miles to the stunt spot just fine...busted some circles for an hour...riding back home...pop a 3rd gear wheelie for maybe 100 feet, see chp, set it down, book it....maxing out the bike in 6th gear (+8/-1 sprocket)...the the bike chugs for a 2nd, then completely loses power.

btw, i **** myself thinking the cop was gonna catch up to me but i had enough momentum to switch freeways.

anyway, i pull over, look at the motor is seized, (won't start)....then i notice a small fire under the gas tank and the flame was getting bigger....i managed to put it out by blowing on it (no homo) for like 20 seconds.

i havn't took it apart yet, but my buddy who was riding behind me said he saw what looked like something shot outta the headers and alot of sparks.

any ideas what it could be?

i'm gonna end this by saying **** my life.

DirtyToes

my ONLY possible solution so far for the cause of this is...

because i had no muffler, just straight headers, cold air went back in the motor and fucked up the valves...does that make sense?

Towlieee

20-50 oil?!

That **** can't be good for flowing through the tiny oil passages

Thick oil quiets valves down, but IMO, I don't think it's good for crank bearings or piston walls..

The thickest I ran was rotella 15-40, and it always took my bike longer to build oil pressure..
And when I ran that **** in my car, my car would tick BAD for the first 2-3 seconds on startup, soon as I switched out to 5-30 in my car, it would INSTANTLY get pressure on startup and the ticking went away instantly



but ya it could 'possibly' be because you didn't run a header.. But that should only just burn a valve I'd think. And I'm pretty sure the header is long enough it would never be able to get cold air to the valve

Dat_Boi

yea im thinkin it might be from straight header.....

DirtyToes

idk, it might just be in my head, but my stunt bike always ran better with thick oil in it.

damn, i'm still trying to figure out how the **** the fire started. i woke up all deperessed this morning caz i have 2 blown motors.
if anything, i HOPE it's the valve, that way i can just replace my head and be good with it....i'm gonna rip this baby apart tonight.

OnEWhEeLNEAL

Dam you got no ****** luck

DirtyToes

you're telling me broski.

...2 blown f4i motors and a fucked up silverado frame...all in 1 month

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anyway, just finished taking the bitch apart under some hot ******* daylight.

took off the throttle bodies and water pump. about 5 inches under the pump i noticed a BIG chunk of the motor missing.

this is the part that gets funny....something ******* shot outta the motor and i don't know what it is.

btw, i was able to fire up the motor...it started for 2 seconds, then i killed it. (just incase)

any ******* how...here are the pics...anyone know WTF this is?

...whatever it is, the motor turned over without it...but i didn't leave it running long enough to hear knocking or anything...

(on a side note, this bike's 2nd gear has been fuckD for a while, so i'm guessing it could be a tranny piece.)

p.s. i'll have PONI give a good bj to whoever can figure out WTF this part it...

600flipper

600flipper

looks like a clamp wouldnt know to what tho ..

Lit

dude thats your connecting rod. You either staved it from oil or it had bearing failure. Anyway about it, your fucked. get a new motor. You sureee it had oil pressure to begin with before you rode it? I know this will sound crazy but maybe it didnt have oil pressure the whole day and it being a honda it just took that long to blow up? Was it making any abnormal noises? or was the open header to loud to hear it.

juzslidin

+ 1 , its part of yoru connecting rod . and it didnt come out of the exhaust lol . where is the hole ?

DirtyToes

i'm gonna kill that ************.

few inches under the water pump

idk, i don't run gauges. WHY wouldn't it have oil pressure tho?! i had a new pick-up O-ring/gasket too. the only problem was i t leaked a TINY bit of oil from around the oil pan.

since the bike still turnes over, can i still ride it? or will it instantly blow up?...i don't care if it rides like ****, as long as it will whoolie

it was really loud, and the only thing i could hear some some squaky noise which i thought was the subframe.

anyone have 2 f4i motors they wanna sell me with a discount?

this blows.

nickxf250

I honestly don't know how the bike is still running, I would have figured the other end of the rod would have smashed into the crank and broke more parts.

DirtyToes

so I found this article on boat engines and you can relate it to bikes:

http://www.mecoa.com/faq/conrod/brok...ine/conrod.htm

it quotes:
my conclusion...

no headers, high idle....the bike ran rich...stretched the rod....later that night it snapped.



wait.

DirtyToes

i have another motor that was oil starved but everything is still intact.

me and a bud are gonna drop the motor on this one tomorrow and bust it open....this bike didn't have a 2nd gear either so i'll replace the shift dogs too.

all i have to do is replace the broken piece...right? ...or is it more complicated than that?

p.s. the manual says there is a "special" honda tool needed to take off the engine mount bolts...how can i get around this or fabricate my own tool?

skinnyR!

ah yes. This thread right is the perfect example of how stunters are a bunch of hackers. Just bolt it back up and put it on the rev limiter. No?

I know, I am not helpful at all, kicken ya when you are down. Couldn't resist.

DirtyToes

***.

blow me.

juzslidin

special tool you can make with an old socket . you have to grind it so there are 4 fingers sticking out to loosen the lock nuts for the swing arm pivot .
im not sure what you mean by replace the broken piece so i cant answer ..... but the motor in the bike is pretty much fucked . from what you have said that engine needs cases (both , there matched ) crank , piston and rod , bearings , head gasket ....... and im sure there will be more .

poni

hahaha a con-rod...hahaha "what is this???" dirty feet you are the man...if i ever need anyhing blown to pieces i'll come see you, but that sucks bigtime bro! is that the engine you just put back together with thew head on it?

DirtyToes

well, the cases/block i can have my buddy weld up (ofcourse after i take it apart so the internals warp)

new headgasket i have

pistons and rods, i have...wouldn't you only need to replace ONE though? (the one that shot out)

bearings, i'm guessing by NEW?

why would i need a new crank?

...p.s. keep it mind the motor still SOMEHOW turns over and runs...no longer seized.