PowerGroove's Catastrophic engine failure and rebuild thread

[vividlust]

its a big problem as well on honda s2k ap1 cars. cept mishifts cause the retainers to crack slightly. best preventable maintenance is to put heavy duty valves, retainers, springs in. they tend to take abuse much better

[PowerGroove]

Originally Posted by vividlust

usually its mis-shifts that cuase valves to drop. the piston slightly touches the valve and bends it slightly, and as you abuse it more and more the bend moves back and forth. like a pop top on a soda can. eventually the metal gets soft and the valve head falls. in all honesty tho all you would really need is a rod and piston. and valves depending on how many dropped and how many destroyed said internals. all you will need is a good hone, piston, rod incase that one bent, and valves. i suggest sodium filled. better with heat and high revs

Originally Posted by vividlust

pg i say some high cr pistons, some port work on the head, and then some serious cam action. and those videos you post will be even more awesome!

I was just over at Kawi looking at the performance catalog. There will definitely be port work done. Still waiting to see the pistons and cylinder walls though to see what I'm looking at. Cams are a possibility too, as I'm thinking I can get some money for the old ones... they look to be fine.

[PowerGroove]

oh... and I head ya on the mis shifts.. but this bike hasn't seen the rev limiter more than 6 or 7 time in its life.

[mark72]

i know what you are going through there pg been there many atime
and done what you are wanting to do ....extensive modding on the engine
when the engine is all sorted ......on a funny note .....its worth every penny when you open it up and give it the beans .....

[greenmeeny]

What a ball ache PG, but she'll be back stronger, faster. What about a balance and blueprint aswell?

[vividlust]

nice yea, that'll be tits man! and yea its really the mis-shifts, when you slip it into neutral and the engine sees 20k real quick its never a good thing haha. but def keep this thread bumpn' with the progress. i enjoy your posts and videos alot!

[hdasilva1990]

Sorry to hear what happened to your 6 man, hope you can get this all sorted and get out on 2 again. good luck with the rebuild.

done a few misshifts hear and there but never hit the limiter.

[reaper636]

dam it now i have no videos to look forward too. lol sorry to hear your loss man hope it gets fixed quick and cant wait to see the updates

[1NastyZ]

Dude... That blows!

I really hope to see you back on the road soon. I have a feeling the itch won't let you rest too long

Good luck PG!

[PowerGroove]

So here's the latest....

Unfortunately my mechanic has taken a job that requires him to be out of town during the week and he wasn't able to get to it much in the last couple of weeks.

Preliminary thoughts are:

Possible rod snapped at the upper end of the piston caused the piston to climb up in the cylinder high enough to hit the valve and snap them on the intake stroke.

He's hearing some noise when hit turns the crank by hand. Sounding like a rod up toward the top... not down at the crank. We'll get the head off Sunday and get a closer look.

As of now I'm on the hunt for new pistons and rings and the head. Also going to look for a motor. If I can get a motor to swap out for now this one will be getting a major overhaul. Either way it's getting rebuilt.

We are going to be doing 1 of two things. It's either getting rebuilt with race cams, slimmer head gasket and new pistons and rings, and we'll be smoothing out the ports to increase the airflow. New headers and PC5 are the minimum.

The possibility. He found a 687 kit for it with cams, pistons, rings, all the gaskets, porting specs and full blueprints. HUGE maybe but it'd be pretty cool pulling 3rd gear power wheelies.

I'll get pics and more updates next week. I'm moving this week so I won't be around that much.

Later all!

[Youssef636]

Originally Posted by PowerGroove

HUGE maybe but it'd be pretty cool pulling 3rd gear power wheelies

Yea alright Mr. Saftey pants haha Good luck wit her

[THUG]

Shit , glad u r okay tho !!!!!

[ZXNasty]

Just strap some wings on it and it'll damn near fly by the time you're done with it

[ZX6RRECTION]

Originally Posted by PowerGroove

So here's the latest....

Unfortunately my mechanic has taken a job that requires him to be out of town during the week and he wasn't able to get to it much in the last couple of weeks.

Preliminary thoughts are:

Possible rod snapped at the upper end of the piston caused the piston to climb up in the cylinder high enough to hit the valve and snap them on the intake stroke.

He's hearing some noise when hit turns the crank by hand. Sounding like a rod up toward the top... not down at the crank. We'll get the head off Sunday and get a closer look.

As of now I'm on the hunt for new pistons and rings and the head. Also going to look for a motor. If I can get a motor to swap out for now this one will be getting a major overhaul. Either way it's getting rebuilt.

We are going to be doing 1 of two things. It's either getting rebuilt with race cams, slimmer head gasket and new pistons and rings, and we'll be smoothing out the ports to increase the airflow. New headers and PC5 are the minimum.

The possibility. TcHe found a 687 kit for it with cams, pistons, rings, all the gaskets, porting specs and full blueprints. HUGE maybe but it'd be pretty cool pulling 3rd gear power wheelies.

I'll get pics and more updates next week. I'm moving this week so I won't be around that much.

Later all!

I concur

I still have my oem motor that died ...good luck gettin to the bottom of the motor failure ...and please document the fuck outta it .....pics video etc
We gots to see the whole autopsy

[PowerGroove]

Originally Posted by PowerGroove

HUGE maybe but it'd be pretty cool pulling 3rd gear power wheelies up the straight at Buttonwillow

Originally Posted by Youssef636

Yea alright Mr. Saftey pants haha Good luck wit her

Fixed... because doing wheelies on public roads is not safe.

Originally Posted by ZX6RRECTION

I concur

I still have my oem motor that died ...good luck gettin to the bottom of the motor failure ...and please document the fuck outta it .....pics video etc
We gots to see the whole autopsy

I'm moving this week and the bike is at my buddies house about 45 miles from here. I'm moving into a brand new house with a nice BIG garage I'll have my own space in... so I might be getting it back down to the hood so I can start doing much of the work myself. My friend just started a new job that's keeping him away during the week and he's only been able to work on it (providing he's not having Injector issues on his Aprillia) one day a week.

Photos, videos, write ups on the rebuild... it'll be very documented. You know me... I can't NOT take pics and video.

To make matters worse... I got my corner working schedule for the spring... and I can't sign up for any dates yet.