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Old 05-30-2010, 09:34 PM   #1
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Default engine sealant, who uses it?

I just bought a used (but fairly new) Nova N21BF engine and I took it today for my first race and a guy told me that he highly recommended taking the motor apart, and using some kind of sealant around the back plate and carb. Is this necessary? If so, how exactly do I do it and what to use? He said he uses something from walmart, was pretty much the same as lucky 7???

Should I do this or is it not really required? He said Nova engines are notorious for air leaks.

Also, if I do end up doing this, and having to dis assemble the engine, will I have to re-tune?
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Old 05-30-2010, 09:42 PM   #2
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I just bought a used (but fairly new) Nova N21BF engine and I took it today for my first race and a guy told me that he highly recommended taking the motor apart, and using some kind of sealant around the back plate and carb. Is this necessary? If so, how exactly do I do it and what to use? He said he uses something from walmart, was pretty much the same as lucky 7???

Should I do this or is it not really required? He said Nova engines are notorious for air leaks.

Also, if I do end up doing this, and having to dis assemble the engine, will I have to re-tune?
Imo i dont think its necessary unless your having tuning problems than look for an air leak. If you take it apart im sure you will have to re tune a little just cause the carb will be bumpped around a little and stuff. But when you seal it up and wanna take of the backplate or carb it is a son of a bit** to get off.
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Old 05-30-2010, 09:44 PM   #3
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how do you check for leaks?
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Old 05-30-2010, 10:03 PM   #4
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http://www.youtube.com/watch?v=epEGetU7NFU
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Old 05-30-2010, 10:26 PM   #5
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hello,

i run Novas too, a Plus-4 and a P5, they are new but i do use lucky 7 sealent, better safe than sorry, its very easy to use and doesn't take much time to dry. i tryed few other sealants but non is the same as the lucky 7,
i clean my engine and spray it with WD40 and then blow it with air, wipe everything so it looks brand new again and they apply the lucky 7 sealant to the back plate, carb, carb needles and the carb mounting screw.

IMHO, even if you dont have air leaks, it doesnt hurt spending 10 more minutes to seal the engine, you will feel better knowing that your engine is sealed

Rcdude, did you use the lucky 7?? its very easy to remove, i just rub it with a towel and its off.

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Old 05-30-2010, 10:52 PM   #6
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Wal-Mart has nothing like Lucky 7 sealant. You do NOT have to take your engine apart to apply Lucky 7 sealant either. It is a wicking sealant so it will work its way into tight areas and seal them off. I seal around the carb base, pinch bolt ends, back plate, and high speed needle assembly while everything is still in place and tightened down.

Go to Lucky 7 RC and pick up a bottle. You wont regret it!
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Old 05-30-2010, 11:06 PM   #7
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i learned on my backplate dont use a sealent that takes 600 degrees for it to break down. i got my engine to 350 and it took me on one side pulling and a friend on the other side.
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Old 05-30-2010, 11:19 PM   #8
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Same here, Lucky 7 works great. I seal HSN, pinch Bolt, carb base, and back plate on all my engines. New and used. Its just preventive maintenance and I love the fact that Lucky 7 works without dis-assembly.
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Old 05-31-2010, 12:44 AM   #9
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i learned on my backplate dont use a sealent that takes 600 degrees for it to break down. i got my engine to 350 and it took me on one side pulling and a friend on the other side.
Ya, one of the magazines showed a video of them putting sealant inside the backplate. Big no no. This effectively glues the backplate to the case.
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Old 05-31-2010, 08:26 AM   #10
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Why in gods name would you put sealant around a nicely machined backplate that has an o,ring to seal it?

And the greif it will cause you when you want to get it off

If your backplate is leaking replace the o ring or damaged housing



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Old 05-31-2010, 09:13 AM   #11
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Originally Posted by T Wright View Post
Wal-Mart has nothing like Lucky 7 sealant. You do NOT have to take your engine apart to apply Lucky 7 sealant either. It is a wicking sealant so it will work its way into tight areas and seal them off. I seal around the carb base, pinch bolt ends, back plate, and high speed needle assembly while everything is still in place and tightened down.

Go to Lucky 7 RC and pick up a bottle. You wont regret it!
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Old 05-31-2010, 09:24 AM   #12
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so some of you are saying to seal everything except the backplate. im confused lol
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Old 05-31-2010, 09:36 AM   #13
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so some of you are saying to seal everything except the backplate. im confused lol
seal anything you want just dont take anything apart to do it,, IF your using Lucky 7 RC Engine Sealant.I personally seal the carb base, HSN assembly, and the pinch bolt ends.
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Old 05-31-2010, 10:14 AM   #14
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Ok guys. I did a leak check on my Novarossi and I am getting bubbles around the bearing on the bottom of the motor. (the kinda big bearing you see when you remove the flywheel) Is this ok? Or do I need to replace that bearing?

Also, I do understand that this is a common bearing to replace, but How do I get it out on my Nova? I took off the back plate and I can't see anything that comes off to get that bearing out.
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Old 05-31-2010, 10:20 AM   #15
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you take out the piston than you pull back on the crank shaft. Than you heat up the motor to take out teh bearing and than put it in the freezer for a little while before you put the new one in. I could be mistaken on takein out/ putting in the bearing but you will get more feedback.
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