blew another f4i motor...
#1
blew another f4i motor...
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.
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.
#2
Re: blew another f4i motor...
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?
because i had no muffler, just straight headers, cold air went back in the motor and fucked up the valves...does that make sense?
#3
Re: blew another f4i motor...
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
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
#5
Re: blew another f4i motor...
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
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
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.
#7
Re: blew another f4i motor...
you're telling me broski.
...2 blown f4i motors and a fucked up silverado frame...all in 1 month
.
.
.
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...
...2 blown f4i motors and a fucked up silverado frame...all in 1 month
.
.
.
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...
#10
Re: blew another f4i motor...
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.
#12
Re: blew another f4i motor...
i'm gonna kill that ************.
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.
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.
#14
Re: blew another f4i motor...
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.
http://www.mecoa.com/faq/conrod/brok...ine/conrod.htm
it quotes:
An ABC engine needs to come up to temperature and running it at an extremely rich setting for a period of time will cause premature wear on the piston as well as the rod to stretch and break. This is because the cylinder is too cold and the piston is forced into the taper and sticks and is then pulled back down with the connecting rod. The normal warm up period will not hurt the engine but trying to run it very rich will because of the accumulative effect of 15,000 rpm’s or 15,000 sticks and pulls of the rod per minute. The damage may not be apparent initially but the rod may break in the future seemingly for no apparent reason.
no headers, high idle....the bike ran rich...stretched the rod....later that night it snapped.
wait.
#15
Re: blew another f4i motor...
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?
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?
#16
Re: blew another f4i motor...
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.
I know, I am not helpful at all, kicken ya when you are down. Couldn't resist.
#17
#18
Re: blew another f4i motor...
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?
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?
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 .
#19
Re: blew another f4i motor...
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?
#20
Re: blew another f4i motor...
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 .
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 .
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.
Last edited by DirtyToes; 04-20-2009 at 10:31 AM.