Weird noise from crankcase

The scoring marks on the rotor in/out side and on the stator coils are a sign of loose dirt particals under the stator cover.
The dirt particals fall into the small gap between the Stator and rotor Segments when you filp the bike over.
I have seen no real gasket or dowl pins in the engine case or stator cover.
The dowl pins are nessesary to centered the Location of the startor cover to the engine case and rotor body. Screws only have a little bit of Play and do not the centering job !!!
In other words the flip over do a little movement to the cover that let the dirt Sounds like you hear.

Scirocco wrote: The dowl pins are nessesary to centered the Location of the startor cover to the engine case and rotor body. Screws only have a little bit of Play and do not the centering job !!! In other words the flip over do a little movement to the cover that let the dirt Sounds like you hear.

I did not see any dowel pins in the pic either. Without them, the stator can become off-center, and it has definitely been scraping on the rotor. The alignment pins were mentioned in the first few posts.



These can be had a lot cheaper than 3 bucks each, but this is what is not pictured above that EVERYONE is referring to, and is the root cause of your mystery noise.

www.ebay.com/i/382536421989?chn=ps

A good way to clean metal filings off of a magnet is to use masking tape. It will pull the particles right off.

Like old_kaw said, make sure there are two dowel pins to locate the cover correctly.

I did see the one larger hole where a dowel would fit but the pics of the cover aren't large enough to tell if they were in it.
Steve

Yes the dowel pins are missing, but the rotor is on there tight. Did the ol’ wiggle test to confirm. when it fell it probably did shift it just enough with all the other crap that’s in there causing the noise. I’ll order some new pins and clean out the cover and rotor and it’ll be good as new! More or less haha. Thank you all for the help.

SWest wrote: I did see the one larger hole where a dowel would fit but the pics of the cover aren't large enough to tell if they were in it.
Steve

Yep, I could almost make out the dowel pin holes, partially filled with clear RTV, yet visible.
Move the camera away from the object and get a picture of the entire cover, and the entire mating surface on the engine cases.


The scraping on the inside is because of the missing alignment dowels.


Notice how the bottom of the clip is hooked behind the two casting bump thingies in the bottom of the cover. It will scrape if it is not hooked to the protrusions.
The scraping on the outside of the rotor is most likely this metal clip that is used to hold the stator wires off of the rotor.

And please don´t forget to order a non-liquid gasket for the stator cover...

well theres no dowel pins on the parts diagram at partzilla... possibly just the gasket keeps everything in place?

No, maybe just unavailable. Try eBay.
Steve

I looked and couldn’t find anything. All the parts diagrams I see don’t have any sort of dowels or pins for alignment.

Calvin9819 wrote: well theres no dowel pins on the parts diagram at partzilla... possibly just the gasket keeps everything in place?

I googled it and did not see any listed for the stator cover either, yet the top right bolt hole appears to be a alignment pin location in your pics (8mm diameter hole). Of course, knowing how some manufacturers arranged their micro phish layout, it could be located on a completely different page. It shows pins on the sprocket cover, #551 and #92042.

if you clean off the clear RTV sillycone and bolt holes, you will find 2 locations.

Calvin9819 wrote: well theres no dowel pins on the parts diagram at partzilla... possibly just the gasket keeps everything in place?

Nope. Keep looking. You need the dowels or this will keep happening. If I can measure some of mine, you might be able to order generic dowel pins.

The dowel part number is 92042-007.