What happens when your rod blows!

[pnut420]

I had about 10 hours on my engine. It was a 426 with a stage 2 cam and 11:1 piston (pretty sure I ended up with a Ross). The motor ran awesome and was fast, I raced a few YFZ's that had a few mods and was right there with them. Then on the last day of my to to Pismo, Ca, I was heading out to comp hill and came alongide a banshee and floored it, I pulled on him for awhile and then a could see a dune coming up so I was going to downshift into 4th and before I could get the clutch lever pulled in all the way, I popped it into 4th because I hit a little crest and all at once the rod loaded up and boom this is what I ended up with.

http://www.imagestation.com/picture/sraid100/p9e82d3f7388ea1bdc7cce2942ccf0d93/f9e7a716.jpg

http://www.imagestation.com/picture/sraid100/p4bf262608a7def4954c69b657dee57e5/f9e7aa2e.jpg

http://www.imagestation.com/picture/sraid100/p40c42404fa934f37a02968c4c0b941c4/f9e7acd6.jpg

http://www.imagestation.com/picture/sraid100/p7e69b479353a8393f58aa32d769a6d0a/f9e7b0d6.jpg

http://www.imagestation.com/picture/sraid100/p1d3eb90f365a8163185731015c470367/f9e7b4f4.jpg

http://www.imagestation.com/picture/sraid100/pbfc97ed2b593a9420881028bcb72f293/f9e7e88e.jpg

http://www.imagestation.com/picture/sraid100/p86add3e6ce659dc6e090f2a5f7cd65cb/f9e7f400.jpg

Here it is before I blew the motor. Still needed a few things.

http://www.imagestation.com/picture/sraid97/p0800bb7a0acbaac6a47c9e91c5b9438f/fa073609.jpg

[Chanman420q]

so now what are u going to do?

buy a corrillo rod

[muff]

ouch :(

looks like hes gonna need a new engine it took some major damage lots of cracks and holes. good excuse for a 450 conversion :eek:

dude btw i was thinkin about going with a 416 pretty soon and now i know im gettin a rod cuz i dont want that to happen cuz if thats all it takes its worth it to spend the extra.

[pnut420]

I almost have it back together. It is amazing what JB weld can do for you. ;)

[JOEX]

Bummer!:(
What do you think caused it to blow?

Joe

[pnut420]

Originally posted by Jingle
dude btw i was thinkin about going with a 416 pretty soon and now i know im gettin a rod cuz i dont want that to happen cuz if thats all it takes its worth it to spend the extra.

I wish I would have done that. Im not sure what it is called but the piece that pretty much links the transmission to the engine (trannie fork or something) broke and Im not even sure if I carillo would have held up to it, its pretty much like slamming it from 5th into 4th while it was under power, Im not a bad rider, I just made a mistake and with the higher compression, etc... it was just to much.

[InsAyneROostin]

Dayum! looks like I need a rod if I plan on going up in cc's...well i'm sorry to hear what happened to your motor man. But will JB Weld hold it together? Good luck.

[JD400exrider]

Dam dude . Sorry to here about that. I know you have been waiting a while to get it done and get out riding. Well I guess its time for that stroker you were once talking about.

Those side cases look like norcalatvers when his rod let loose. (I was behind him when it locked up) Difference was he was running 13.1 compression on a 440 built motor. His lasted 4 years with no problems up to then. There are so many 416 & 426 motors built with 11.1 compression with a stock rod. Sounds like a freak thing. You never know. But a stronger rod is not a bad idea.

[Aceman]

A heavy duty rod is good insurance. You could of bought two carillo rods for the price of one busted case half. Lesson learned, the hard way.

[roostin_dale]

ouch..thats the chitterz!

[batgeek]

What happens when your rod blows!

well...my gf usually climaxes also. then i roll over and go to sleep.

[Aceman]

Is that the kind of girlfriend you have to pay:D :p

[TCracin440ex]

if i was u i wouldnt try and waste my time or money on that motor to have it do the same thing again....jb weld i dont think will hold that bike...i kno i had an oil leak between the 2 casings of my old 250x and i put jb weld on the pin hole and it didnt even hold the oil....so i dunno

[pnut420]

Originally posted by TCracin440ex
if i was u i wouldnt try and waste my time or money on that motor to have it do the same thing again....jb weld i dont think will hold that bike...i kno i had an oil leak between the 2 casings of my old 250x and i put jb weld on the pin hole and it didnt even hold the oil....so i dunno

:D I was just kidding on the JB weld. Well their is good news for me though, I have a backup motor that is the original motor out of the quad, it has pretty low hours, when I took the piston and top end apart it still looked great, no signs of wear, just some deposits. MY polished side cases are ok still as well as my ported head, new valves, etc... The stage 2 cam is good still also. Luckily the rod blew and when it came back around it hit by the starter and didnt hit the piston again and shoove the piston into the head. I was just waiting on the $400 I need for a piston kit and to have it bored, I think Im going to do a CRF timing chain while Im at it.

And for those of you that might be scared from what you saw in the pics, the stock rod was not the problme in this case, I missed a shift and everything just loaded up all at once. The motor was running great and would has lasted a few years if it wasnt for bad shift. Even though I only has a stock CDI in doesnt mean I didnt over do it, it probably wound to 11,000 all at once.

[cals400ex]

were you able to hit the stock limiter pretty easy? just wondering because i nail it on my 406 in the first few gears easily. i didn't know if a 426 would rev as high as a 406 or not.

[pnut420]

Originally posted by cals400ex
were you able to hit the stock limiter pretty easy? just wondering because i nail it on my 406 in the first few gears easily. i didn't know if a 426 would rev as high as a 406 or not.

I didnt seem to hit the limiter to much. My motor would pull all the through but it seemed to have ALOT of torque. My buddies both have 416's with Sparks CDI and said before they put the Sparks CDI in they hit the limiter all the time, I feel like I hit the limiter alot more with my stock engine then I did with this one, and the reson was because this one had more power per RPM so I could stay in the power alot longer. I think the 426 is a good way to go, becuase you get the low end torque with all the mid to top I ever wanted. Mid to top I surprisingly beat the YFZ450, we did a dig from 4th gear and I just kept pulling, but on the bottom end in the sand the YFZ450 was so light and I didnt have paddle tires so I got took in the drags, but as soon as I hooked up I started to catch them.

Im going to put the motor back the way it was, but the only difference is Im going to run the custom piston that Micky Dunlap has. Im just hoping my head wasnt decked to be true with a JE or Ross piston.

[cals400ex]

thanks for the response. what kind of piston do you want to run now? i don't know anything about his custom piston. by the way, what mods do you all have? who did porting if you have that done? thanks again

[pnut420]

Originally posted by cals400ex
thanks for the response. what kind of piston do you want to run now? i don't know anything about his custom piston. by the way, what mods do you all have? who did porting if you have that done? thanks again

I plan on running the Wiseco piston, basically it uses the same piston rings as JE or Ross (not sure which one). The main difference is Micky has Wiseco maske him a custom piston for the ex that is the right deck height, where JE or Ross you have to deck the head to get the proper "squash area". If my builder decked my head, then I will run a Ross or JE, if not I will order a piston from Micky. I also had a ported head that was done at a local shop from Sparks425ex on this site. Im dont know the name off hand, but I know it was a good job, I got a port that was between a mild and full race port and that setup was sweet, my buddies had mild port and this one seemed to flow better, it had instant throttle response, but didnt really Rev out that quick it just started the power sooner. We all are running a stage 2 cam as well as Sparks exhaust. When racing on the MX track the power was really usable, I could have used a +1 1/4 swingarm though, I lost to a YFZ450, but I hit the kill switch for 45 seconds so that explainds that. But on the uphill section I could pull on him and almost got past him.

I suggest getting a FCR39MM and a mild or little above mild port and it will bring your engine to life and your buddy will be left i n the dust. The main thinn when building an engine is that everything must match and thats what I went for on mine and it sure did perform. Ive never rode a EX that had a stage 2 only, just my brothers that has an HMF and FCR39mm, and I can say the carb did as much if not more than the exhaust did.

[cals400ex]

i really didn't notice much power gain with my x-6. yes, i did get gains but they were only at high rpms it felt. it did perform much better than my friends big gun though. also, i was debating between the fcr 39 and 41. i have talked to a few people who have both and they all said they like the 41 better, however they also had more mods done to their bikes than i do. also, i am more interested in top end power than low end power. i am thinking about letting gt thunder porting my head. i want someone with a decent turn around time and the quality of the job is most important.

[pnut420]

Originally posted by cals400ex
i really didn't notice much power gain with my x-6. yes, i did get gains but they were only at high rpms it felt. it did perform much better than my friends big gun though. also, i was debating between the fcr 39 and 41. i have talked to a few people who have both and they all said they like the 41 better, however they also had more mods done to their bikes than i do. also, i am more interested in top end power than low end power. i am thinking about letting gt thunder porting my head. i want someone with a decent turn around time and the quality of the job is most important.

With the port and polishing and either way you go 39mm or 41mm, they will both be good. If you only have a 416 a 39mm might be better, but you should be fine with a 41mm.

We installed just a X-6 and FCR39mm on my brothers quad and made a big difference, his HMF seemed to pretty close in power also.