Deconstructed 2-stroke scoot!

[cyberconte]

I apologize in advance for my newbie questions - i only have a small knowledge of engines, and don't work with them often.

I took a few hours today (since i don't need it til monday) and stripped my 2-stroke XSJ50QT-2 down to expose its innards. These are the pictures i got:







You can see the thick layer of oily sludge all on the engine block. I'm not entirely sure how i'm going to clean it, but i will while i have it ope....

I pulled the spark plug (since i'm going to replace that) and noticedit was covered in a red film. This didn't fit any category in the spark-plug chart that i saw - any thoughts?

I tried to take the cover off the gears (second pic) to see if there was a gear restriction, but neither me nor my 19V drill could budge those darn screws to get it off. Any clues, or do i just need a 'bigger tool'? I'm afraid a bigger tool will just strip them out...

Also, you can see from the first picture that the carburator is pretty small - do you think that has the screw/washer restrictions?

Finally, the idle seems to be a bit low - after riding the bike a while, it seems on the verge of stalling out when i stop (it has a couple times), which, riding at night, makes it interesting since the headlights are powered by the engine only. If nothign else, I would like to idle it higher so the lights don't dim so drasticly at stop signs and lights. Does anyone know which screw would do that for me?

thanks for you time in helping me with this! I hope to have this scoot restored to better-than-new by the time i'm done with it

[cyberconte]

Ahh, sorry - this should've been in the engine section...

[Rusty]

I have yet to find ANY derestriction info about this 2-stroke engine!

[cyberconte]

I was looking at the parts manual, and it looks like theres some kind of washer/clip in the carb, similar to the derestriction guide, but i didn't see any screw in the cap or anything. If i'm feeling brave at some point (and don't need my scoot) i may take out the carb and disassemble it to see if that washer can be moved at all...

Other than that, I havn't found much either.

[Badobsession (the real one)]

On your fourth pic down i can see the mixture screw at the airbox end and in the middle of your carb (in line with the throttle slide) would appear to be the idle speed adjustment screw although its not very clear in the pic.
If that is not the screw it will be on the other side.
For your cover screws get a good fitting screwdriver and place on the screw and give a sharp tap with a decent size hammer.
Then try to unsrew it (usually works just make sure the screwdriver is a perfect fit).
Could the red film be two stroke oil? What colour oil do you use?

[cyberconte]

Thanks for the reply! That side has most/all of the screws, so thats probably the one. I need to adjust the idle when warm, so i'll give that a shot.

As for the spark plug - the oil is green, so thats probably not it. It was a dry film, however given the abuse this thing has taken, i've decided i'm just going to get a new spark plug, ride that awhile, and then take another look. I'm not sure *what* the previous owner(s) were putting in the fuel, (oil was at least one thing - there may have been others to try and 'fix' the poor performance) so it could be reminants of that. Its alawys good to start from a known (clean) slate.

I did buy some fully-synthetic 2-stroke oil today that is red, and i'll be putting that in when i burn through whats in there now.

Thanks for the tip on the crank case. I'll give that a shot next chance i have. Maybe sooner, since the kickstart is broken and i'd rather have that as an option if the battery goes

[Rusty]

Do remember that these 2 strokes are chain driven and therefore the transmission case will be full of oil. Also, be careful of the gasket when you take the cover off as i really can't see you getting a replacment anywhere.

[cyberconte]

Good catch - that would have been an ugly suprise! I've seen the chain in the parts manual, and noted (and wondered) why there was a "600mL" label next to the oil input, and wondered where all that oil went (based on the 100mL talked about here)... just never put 2 and 2 together

I have no idea how a chain-driven CVT works (can it be a CVT with a chain? I've only seen belts...), so this will be a bit more exploring than i was anticipating!

Thanks for the help

[Rusty]

Im not sure that it is cvt (please correct me if i am wrong). It uses a wet clutch system