Aluminum Shavings in New Crankcase ms660

Hi guys,
I've been lurking for a while and absorbing as much knowledge as I can. Thanks for all the great info.
I just recieved an ms660 kit and upon inspection I noticed a ton on aluminum shavings in the crankcase halves from when they tapped the bolt holes and it sticks in the nooks and crannies due to the oil coating from the manufacturer. I also found that some had gotten into the crankcase bearings and in between the bearings and seals. I would point out that this could easily be the cause of some of the lower end bearing problems I've read about.

So a heads up to flush the bearings and crankcase really well before installing.

My question is...
What do you guys recommend rinsing the crankcase and bearings with? If I can save the seals that would be great, but I realize the only way to be 100pct sure there isn't a chip lurking between the seals and bearings would be to pull and replace the seals.

Appreciate any advice.

 

Flush with straight gas , or mix ...

Sawhawgz, ruining the internet since 2012...

 

I would ditch the seals, and get some new ones, then You could flush with any light oil, kerosene, diesel as it can be used inside without fear of a spark etc. or what ever cheap petroleum based product you have but petrol should not be used in an inclosed space.

The good thing with a light oil is you can filter out any particals and reuse. Where as petrol with have mostly evaporated

Well that's how I would do it.

 

I've flushed with mix when I can do it outside, and with WD-40 inside. You may be able to leave the bearings installed. Just make sure they look clean and spin smooth.

 

If in doubt, toss 'em out! Easier to put new bearings and seals in now than later.

 

Thanks guys. One of the bearings has snagged a few time when spinning it. I blew some compressed air through it and it's spinning smoothly now, but I'm contemplating replacing it anyways since I'll be ordering the Hyway gasket pack from HLS tonight. The bearings are on sale for around $12 for Presidents day, so I figure better safe than sorry, and a bearing disintegrating at 13 - 14,000 rpm would be sorry indeed.

 

When I built my MS660 clone, the first thing I did was ditch the factory seals. Then I cleaned out the case, all drilled and tapped holes, dowel pin holes and the bearings with brake cleaner. I then blew everything out with compressed air, and relubed the bearings with 2-stroke oil. Made the bearings turn really smooth. I also loctited the dowel pins in on 1 side of the crankcase to prevent them from vibrating out. Seen a video on youtube showing what happens when a dowel pin walks out, and gets into the clutch. Not a pretty sight.