Engine pros please help

Momus

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Momus 3/13/2020 2:01am

3/13/2020 2:01am

ecmx274 wrote:

I have had a 125 motor with all brand new parts bolted up, with the holes taped off and the entire thing wrapped in shrink wrap...

I have had a 125 motor with all brand new parts bolted up, with the holes taped off and the entire thing wrapped in shrink wrap sitting on my shelf in my garage for about 6 months. Everything was lubed and I coated the cylinder walls lightly with oil. I did not put any trans oil in it. Is it ok to throw it on the bike put some oil in it an go ride or should I re soak the clutch in oil and clean the inside of The cylinder? I have never let a motor sit for that long without putting oil in it so I don’t no. I’m also curious if the piston ring will still seal properly I’m not sure if oil thickens or anything along that line after sitting for awhile? Like I said I wrapped it up in string wrap really good and taped off any holes so there’s no way moisture or dirt got near it. Maybe it’s a stupid question but it’s a expensive motor with all brand new parts and a custom transmission so I worry. Thanks

I'd pull the head and cylinder, wipe the bore clean put a drop of oil on the Piston skirt and fire it up.

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Chris99Flannery

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Chris99Flannery 3/13/2020 2:25am

3/13/2020 2:25am Edited Date/Time 3/13/2020 10:12am

Wrapped up so well, id put a few cc oil in the spark plug hole, turn it over then let sit an hour, turn over some more and fit plug and start it with fresh fuel.

Edit- yeah didnt see the dry tranny bit. Agreed to wet them refit them.

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Paw Paw 271

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Paw Paw 271 3/13/2020 2:35am

3/13/2020 2:35am

You will need to soak the clutch plates as they were left dry.

Paw Paw

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DynoDan22

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DynoDan22 3/13/2020 6:35am

3/13/2020 6:35am

My opinion is to put a half cap full of 2 stroke oil in the spark plug hole, fill with trans oil and install the motor. By the time you install the motor, the clutch will have absorbed oil (make sure you turn the engine over a few times while you are installing the engine). The cork type material absorbs oil like a sponge. I always had spare motors in my race truck in the exact condition yours is in. I'd add trans oil and a shot of two stroke oil and turned the engine over a few time during installation. Never had an issue. Deep thought:

When an engine is assembled brand new at the factory, little assembly lube is used beyond trans oil for the tranny and a smear of two stroke oil for the piston/jug. The clutch plates are NOT soaked prior to assembly. I've witnessed this first hand. The engine is then assembled into the chassis and when it reaches the end of the assembly line, the bike goes onto a dyno. If it passes the minimum HP threshold, it goes in a crate. If it fails to meet the lowest HP number, the bike is set aside for a motor swap. Yes, your brand new bike gets warmed up for about 15 seconds and strangled on a dyno. The next time you are in a dealership, look at a brand new MX bike you your choice. Look at the rear rotor and it will have wear marks from using the brake on the dyno to slow it down. The front rotor is unused. Your motor is fine to install add oil prior to install, turn it over a few times randomly and let 'er rip.