Jammed Pistons

PICTURES would be huge to help you.

Questions off the top of my head.
1 Is motor in bike ?
2 Is motor in gear ?
3 Is piston at top dead center ?

Many here can help , but more information is really needed to speed up your responses from us with advise that will work,,,,

You are turning the 17mm nut not the bolt that runs into the crank, right? You don't wanna break the bolt off for sure. Used to break stuck engines loose by pouring a little transmission fluid on top of piston and letting it set a few. It's a little thinner than oil and will seep a little deeper in. might help.

nivlac wrote: Feels like the bolt is ready to break off the crank with no piston movement. Is there any other way to turn the crank?

:pinch: you might try putting the trans in third , forth or fifth gear with the bike on the center stand and using the rear wheel to move the crank...........I've done it before :huh:

turboking wrote:

nivlac wrote: Feels like the bolt is ready to break off the crank with no piston movement. Is there any other way to turn the crank?

:pinch: you might try putting the trans in third , forth or fifth gear with the bike on the center stand and using the rear wheel to move the crank...........I've done it before :huh:

Exactly, put the transmission in the highest gear possible to get the best leverage, then rock the bike.


However, let me say this. If it is stuck that hard, I would venture to guess any sort of forcing the issue like this, I'd give up and take it in. The amount of damage you might do at this point by forcing it versus paying a shop to get it loose -- and they have probably done it before, had to loosen up a stuck install -- might be cheaper to pay the shop $80 for an hour of their labor, let the experts free it up. They might get it done in 5 minutes and still charge you a full hour but WORTH IT MAN.

I can see myself getting into to it, way past the point of common sense, "I'm gonna break this sucker free I don't care what happens" then the regret.

I have done that and the self-loathing afterward aint worth it man. If you're confident you can get it freed up with no damage go for it.

My # 3 piston (# 2 looks the same)

Overall view of carnage
I'm having a little problem posting from photobucket hope you don't mind clicking the link.

I think I see the carnage! Bottom of the oil ring out of the groove and dropped downward.

Does that photo mean you freed up the 2 stuck pistons, and if so, what does the cylinder wall look like?

[img]i1307.photobucket.com/albums/s599/cerictaylor/PistonProblems_zpsf7abaca8.jpeg[/img]

No, 2 & 3 are stuck.I was able to remove the rings from 1 & 4, trying to eliminate the possibility of breaking. The center pistons are stuck. I've got a parts engine that I broke down and the cylinders are in good condition. The engine a shaftie and in in the bike.

:blink: from your pix it looks to me like your cylinder is cocked, #3 is farther up in the sleeve no skirt visible......than #2.
I'm just throwing this out there... you could make 2 small mini jacks from fine threaded 1/2-20 bolt with 2 nuts pushing a spacer sleeve / block on one end being sure to use a couple of sheet metal plates on each end so to spread the load across the cylinder and case. :S
I've never seen a cylinder with a laid over ring that far into the cylinder..... :huh:

I tapped & prodded, I prayed & pushed I found a folded oil wiper ring on the # 3 piston/ cylinder. I checked for damage and found none and with a good bit of patience, another ring, and the help of a buddy on the other side of the bike installed the cylinder block and now have real smooth movement. I appreciate all the input.

Good Deal...

That coulda been worse, nice 'save' there, hope it breaks in fine. The hard part's over.
Well, most of the hard part. When I put mine back together my biggest fear is a leaking gasket and that I'll have to re-do it. You rationalize it away by saying "well if I have to do it a 2nd time, it'll go quicker" which is a bunch of b.s. it's still the same pita, only difference is you go slower and don't drink 'anything' during the work. Good luck with the break in!

glad to help..... :pinch: hope thing go smoother from here on :pinch: