Topic: best leverage for engine unsticking

[seanbarney41]

I have a cb750f3 with a stuck engine that I have been trying to free.  I have filled the cylinders with 50/50 atf/acetone mix.  Can't get much force on the kickstarter because it won't go down far enough to be in the part of its stroke where you can put some weight on it.  Have removed the stator cover and tried a breaker bar on the big bolt, but counter clockwise just loosens the bolt and clockwise just keeps turning the bolt tighter to the point that it feels like the threads are gonna strip.
 So I put a loose drive chain on it, shift it into fifth and have been trying to jar it free by jerking the chain with the wheel.  Is 5th gear giving me the best leverage?

Any way to get some more leverage through the clutch?

I realize this engine is probably going to have to get torn down but I would love to break it free before too much gets taken apart if at all possible.

[carnivorous chicken]

HAve you tried putting it in gear and rocking it back and forth while sitting on it?

[scottly]

Yes, 5th gear will give the best leverage.

[seanbarney41]

I was gonna chicken, but it has a flat tire.  Anyway, I just freed it!  Finally got brave and used an impact on the rotor bolt.  Bumped it back and forth and finally freed it!

[seanbarney41]

Another win for atf and acetone!...except now I gotta clean my shop lol

[jgger]

Sean I might be stoopid on this (probably am) but 5th gear is closest to a 1 to 1 ratio. If you use 1st gear I think whatever the ratio is will be reversed because of where the "power" is coming from. So by cranking the rear wheel 1st gear would be in your favor?

Try it, I double dog dare you!

[seanbarney41]

Sean I might be stoopid on this (probably am) but 5th gear is closest to a 1 to 1 ratio. If you use 1st gear I think whatever the ratio is will be reversed because of where the "power" is coming from. So by cranking the rear wheel 1st gear would be in your favor?

Try it, I double dog dare you!

except, in this case you are driving the engine with the wheel, not the wheel with the engine

[jgger]

Toadja I might be stoopid! Haha

[seanbarney41]

naw dude, I was confused at first too, that is why I posted this question

It's funny.  I rarely ask questions here.  But whenever I do, invariably solve my problem on my own.  Engine turns nice now but cylinder 4 spewed some really dirty, gritty filth

[Stev-o]

Another win for atf and acetone!...except now I gotta clean my shop lol

How far was the "shot"?   I have the record at 17'!

[seanbarney41]

Another win for atf and acetone!...except now I gotta clean my shop lol

How far was the "shot"?   I have the record at 17'!

You are still the champ Steve-O!  The impact method just resulted in multiple small squirts ha ha but I still got a big mess to clean up.

[scottly]

See if it starts up! I double dog dare you to try.

[seanbarney41]

See if it starts up! I double dog dare you to try.

Oh I will!...got some carb and electrical work to do first

[seanbarney41]

...pics of the carnage
20180908_165224 by Sean Barney, on Flickr
note the undeniable evidence of a future frame kit customer
20180908_165213 by Sean Barney, on Flickrmanaged to land one spooge fountain right on that perfectly good wood chunk
20180908_165242 by Sean Barney, on Flickr

[Stev-o]

See if it starts up!

+1 Run it!  Slap a good rack o carbs on there and I bet she fires...

[ekpent]

  Who was the lowlife scumbag seller that sold you that piece of s#@t Sean ?       Congrats on getting her unstuck ! Be a lot easier now at least to break it down if or when it needs major surgery.  That frame tube rust out or was somebody doing some 'custom' mods of some kind ?

[seanbarney41]

Yeah, it looks like the valve cover has been off before as there is a mismatched collection of bolts holding it on.  Someone apparently thought hacking some v shaped notches in those tubes with a hacksaw was gonna make that job easier.