STuck engine mounts

[ZXR750H1Resto...]

I'm stripping down an H1 ZXR750, and am having trouble removing

the rear engine mount bolts.

They are 10" long coach bolts, but appear to be rusted solid in place One at the top rear of the engine, and one at the lower rear on the engine. I have managed to persuade the nuts from the threaded end of the bolt.

Tryed battering the bejesus out of 'em with a lump hammer and they wont move. They wont move when attempted to with a a torque wrench.

Anyone got any ideas. I don't want to compromise by leaving the engine in the frame when trying to clean-up and ensure the bike is in top condition.

Appreciate any advice anyone has got

Thanks

Rob

[stinkwheel]

Lift under the engine with a car jack to take the load off the bolts.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[baldy]

Use copious amounts of WD40. If that doesn't work, lots of heat. Then try a big spanner around 4 foot long.

If all else fails try the sledge hammer and all of the above.
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One day i will rule the world, just not today.

[hmmmnz]

i vaguely remember them being threaded,
undo the bolt from the other side, the nut is just there to stop them from coming undone...
i may be thinking of a different bike altogether, but try that
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[B10Hazard]

Get a good penatrating spray
+1 for heat
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Current bike .. The police stole it
No longer any socks
Let me take you on a trip . . let me show the world in my eyes.

[lonner]

hi

this particular little nasty is common on most kawasaki's.

the bolt is a sliding fit and not threaded.
but it has a square locating part for the frame adjustment dowel and this can be confused with it apearing to be threaded.
ignore this part as it just slides out of this.

they rust on the left side as that's where the water gathers when there on the side stand

give it some heat with a blow torch if pos and try and give it a good clean hit and if pos have someone apply turning pressure at the other end.
use a drift hard wood etc if your hoping to save the thread.

try this a few times and if you get some movement apply plus gas and soak for a while.

if you just go brute force the bolt will snap and does crack the casing occasionally

hth

[ZXR750H1Resto...]

Thanks for your help

I've had them soaking for a few days, and have got a bigger heat source home tonight to give it a bash.

[ZRX61]

[lonner]

[ZRX61]

Removed one from a SOHC CB750 once in SEVEN pieces...

[b-f-c]

A trick I've used is an SDS drill, turn off the rotation, but leave the hammer action.

Makes light works of b@stard stubborn bolts, but can knacker them.

[lonner]