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Old 02-09-2010, 10:41 AM   #1
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Default backplate stuck

so i sealed my backplate on my ninja jx21 after break in with rtv black high temp sealant and i might have put too much on. i went to tear down my motor after last weekends race and i just cant get the backplate off. its not the piston in the way, that is up at tdc, it is just the fact that the sealant is stuck. anybody got a method to get it off. im pretty sure i put a small bead on the inside lip too of the backplate so its not just the outside where i can cut it off with an exact-o or something
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Old 02-09-2010, 10:43 AM   #2
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Use a pair of channel locks on the corners and twist it until it comes free, just make sure you use something in between the channel locks and the back plate or yours will look like mine with a chunk out of it because the channel locks slipped.
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Old 02-09-2010, 10:44 AM   #3
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heat gun, but once you heat it up and take the back plate off, wipe it down and put in back in untill it cools... I have warped to blocks just dont cook it
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Old 02-09-2010, 10:47 AM   #4
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tried the channel locks, twisted and twisted back and forth until i couldnt feel my hand anymore. i mean it is REALLY stuck on there. i even tried the ehat gun but i didnt get it that hot. i guess i will heat it up a little more. i just cleaned what i could with the piston out using denatured alcohol and carb cleaner. then i re-oiled and put it back together. next tear down i will just try some more heat
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Old 02-09-2010, 11:36 AM   #5
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Try to break the seal with a Hobby Knife around the outside maybe? Channel Locks usually work for me with a gentle rocking motion, even when I was over-zealous with RTV.

The High Temp RTV might just bond REALLY REALLY well though, and the heat gun probably won't get it hot enough. I normally use Ultra Copper without issues though. You are 100% sure the piston is up high enough?
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Old 02-09-2010, 11:46 AM   #6
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Put the backplate in a bench vise.

This will be a little safer and non-marring than pliers.

Also, this product combined with a little torch action (again...mild torch action )

Will likely "lick" the outer seal at the edge of the plate and let you get it off.

http://blasterchemical.com/display.cfm?p=50003&pid=4

Or you can spray it and let it soak for a bit first; then heat it with heatgun.

Use gloves or wife's old (old) hotpads
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Old 02-09-2010, 02:30 PM   #7
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I just lay the block on the side.(opposite side of carb slide) make sure the piston's where its supposed to be, line up a 3mm wrench and Whack it with another driver or something with some weight behind it.
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Old 02-09-2010, 03:14 PM   #8
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integra that post really confuses me you line up a 3mm wrench on what?
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Old 02-09-2010, 03:40 PM   #9
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Quote:
Originally Posted by skoalisbad4me View Post
integra that post really confuses me you line up a 3mm wrench on what?

the back plate...the 3mm is just a flat punch that is wide enough to not scar the back plate when you hit it.
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