New machine is a smoke machine

[rabidnz]

Hey again bucketeers, I have again bought a 50cc scootermotard for the missus as she was well jealous of the gasgas for zipping into town . Found her a totally mint suzuki smx50 for a good price, up north but my mate works for owens so free freight (well beers). She arrived looking amazing with 500kms on the clock its pretty much new but appears to have sat for a very long time. Even still started first kick and putted away nearly silently, albeit very smokily.
It is smoking like a centerfold now, decent "discharge" of smoke when idling, and quite nice thick white maybe a tiny tiny hint of blue puffs. It is spooging majorly out the muffler, which i assume is now pretty damn blocked.

There are no bubbles and no loss of water from the rad tank, the problem persists equally after draining the trans overnight, that is as far as I have gone to examine the head gasket and wet crank seal. I am just hoping its not the bloody center case gasket, is there an acid test for that? I will drain out the trans and measure for quantity difference.

My grandad is an old hat with two strokes, he reckons its all the gunk that has been sitting inside the crankcase and pipe that is burning off, but i went for a 25km full throttle run with a new plug and it was smoking just the same. Plug reading LEAN by the way but only on half of the plug (does this mean water or oil has been hitting it ?

The thing still rides totally fine, and feels as if it is restricted to 65-70kms somehow, but also feels like its only doing half the work, have looked up the pipe and cant see any restrictors, the carb is 18mm mikuni so that should be plenty for tickling up stock a little.

Cheers in advance for your infinite wisdumbs :)

[Henk]

If it's been sitting for a while and is blowing as much smoke as you suggest I'd suspect the crank seals. Looks like you are slowly burning your way through the gearbox oil.

[Bender]

If it's been sitting for a while and is blowing as much smoke as you suggest I'd suspect the crank seals. Looks like you are slowly burning your way through the gearbox oil.

^^^^^^^
What he said.

[rabidnz]

cheers, its an rg50 engine, would I just need to replace the clutch side seal right?
also whats the chances of being able to match the seal at a bearing and seal shop? as they are bloody hard to find and im too scared to even ring suzuki and hear what ridiculous treasures they want for an original one.

[Henk]

Get the numbers off the seals and give your local bearing shop a call.
I'd probably replace both sides since one side will have you burning oil but the other may have you running seriously lean.
The bearings may be OK. If you have the time and inclination I'd be pulling the top end off and checking the state of the mains, and big end. I've heard of a few RG50s that having sat for a while run for not very long and then expire. Something to do with condensation getting in and damaging the big end bearings, some of the F5 guys on here might be more help. Been a number of years since I had an RG50 in bits.

[TZ350]

If its an RG50 then the wet seal is inside and to replace it the crankcases have to be split..........

We have been able to buy original seals from Suzuki (2 years ago).

R/H Crankcase Oil Seal p/n 09283-28013 $10
L/H Crankcase Oil Seal p/n 09283-18004 $5
Gear Change??Oil Seal p/n 09285-12006 $7

I suggest that if you get the cases apart that you change the rod assembly for a rod kit from a later RG/RMX/SMX/TS/GT/RV/MT50 that has oiling slots in it.

ConRod p/n 12161-04710
B/E Brg p/n 09263-16034
L/E Brg p/n 09263-12023
Pin p/n 12211-04711
Washer p/n 09160-16021

And a fresh piston wouldn't do any harm either.

Wiseco Piston 826M04100 (std bore) Fits JR50 78-2004 and Kawa KDX50 03-04

The RG50 has only 3 thick clutch plates, 4 thiner TS/TF/GP100 or 125 and a steel will fit for a much better clutch.

Clutch cover gasket p/n 11482-13710 $22
Cly base gasket p/n 11241-04710 $14

And if you or anyone else ever wants to sell their RG50 or any engine parts or general junk, please PM me........... :niceone:

[F5 Dave]

well above, but most likely the smoke is coming from the muffler that is soaked in oil.

[rabidnz]

thanks heaps tz, this is the exact infinite wisdom i was hoping for. Not so grand that the the seal is inaccessible from the outside!

I drained the trans oil and left it to drain over night, before starting it up in the morning and it ran equally as smokey, thats what made me think it could be something other than the crank seal, such as extreme rich jetting and lots of carbon and spooge buildup in the whole system .

Also because of the extreme low amount of ks the bike has done from new(500km) i wont be in a hurry to do the top end unless it is looking scored up or the ring end gap doesnt measure out , ill just clean it up.

And finally because it is a 2004 smx50 motor (same as rg50 appareantly) i would assume that it would already have the rod with the oiling slots ? as id really like to not spend money on her, as the gasgas and rmx250sm are getting all my funding at the moment.

And yes the clutch is grabby as shit and i will be looking into swapping the plates for the ones youve mentioned while i have the case open :)

Thanks again!