New scooter, lots of problems

Jecklen · 07-21-2014, 08:26 PM

I just bought a Baja sc50 scooter for 50 bux. Upon initial inspection, the throttle on the carb is locked, the kick start won't budge and the starter just clicks (even with a car battery). This doesn't mean the engine is frozen up does it? There is oil in the case. Where should I start?

Madathlon · 07-21-2014, 09:08 PM

I would pull the head and see what the piston looks like in that case.

Jecklen · 07-21-2014, 09:26 PM

Crap so many body panels to remove lol

Bvance554 · 07-22-2014, 01:17 AM

Or put a wrench on the flywheel and see if you can turn it over that way. The throttle is a completely different issue. It must be bound up somewhere.

dwint51 · 07-22-2014, 07:04 AM

just take off the cvt cover and move your fly wheel,take out your plug

Jecklen · 07-22-2014, 04:08 PM

So, extremely worried now... I pulled off the carb and the tube going down into the cylinder is full of a white chunky powder... The carb is full of powder as well... What.... the hell. What do I do at this point? Is this even repairable?

Jecklen · 07-22-2014, 06:03 PM

Upon further investigation the carb has that white powdery crap in it, the cylinder head is filled with it but the piston and piston sleeve are clean. Yet again I screwed up, i lubed the cylinder and it rotated freely than stopped... I think I bound up the loos e chain on the crankshaft sprocket... I can't pull the cylinder head off because a frame bar is in the way so I think I have to pull the engine, no idea where to start with that ether.

Bvance554 · 07-23-2014, 12:37 AM

WTH is that? It looks like ash. Looks like someone did something to deliberately destroy the engine. But you only paid $50 so I still don't think it would be a terrible deal as long as everything else checks out. I think I'd buy a new engine.

Jecklen · 07-23-2014, 06:44 AM

You don't think it's worth trying to thoroughly clean the carb and the cylinder head?

blueboy5000 · 07-23-2014, 07:07 AM

The white powder is a a combination of evaporated gas/gas resins and salt. That's what these carbs look like if they sit for a few years without draining the gas out of them.

I'd pull the carb down and clean it out good, the powder (mostly zinc, salt and magnesium) will rinse off easy with carb spray. Though if you wanna get it super nice and clean, soak all the non-rubber parts in a clean bowl of de-natured alcohol for a couple days.

While it's probably not the best, the powder shouldn't screw up the engine. Though I would immediately change the oil.

Do a compression test (use a TESTER, not your finger). If compression is good, you're probably fine once you get the carb cleaned up.

Also remove the FUEL TANK and FUEL LINES, and REPLACE the lines and clean the tank with fresh gas and carb spray, make sure you clean out the PETCOCK also.

Jecklen · 07-23-2014, 04:07 PM

Wow, great information! Thank you very much,!

Madathlon · 07-23-2014, 06:53 PM

While that is a good thing I would still pull the head, If that gunk in in the cylinder and you get it cranking you can do some real damage ranging from a bend rod to bent valves. Plus it would be so much easier to make sure you cleaned the head fully.

Jecklen · 07-23-2014, 09:20 PM

I just bought a bbk that comes with a new head and jets. Figure best to just replace it for the price. Now I know the 100cc is actually 82cc, what size jet should I have? (purchased a new carb too). Also I may have overlapped the chain on the crankshaft, any ideas for fixes?

Jecklen · 07-25-2014, 03:26 PM

Okay so heres a picture of my chain wrapped around my crankshaft...

I've tried everything I can think of to get it off... I tried backing out the flywheel until the bolt just came off. Tried putting bolts in the flywheel and levering off those... I've tried hammering the old piston to back it out, I even tried moving the flywheel forward to just run through the stuck chain... I have no idea what to do at this point... Really really need help.

07-23-2014, 07:07 AM	#10
blueboy5000 Join Date: Jul 2011 Location: Connecticut Posts: 493	The white powder is a a combination of evaporated gas/gas resins and salt. That's what these carbs look like if they sit for a few years without draining the gas out of them. I'd pull the carb down and clean it out good, the powder (mostly zinc, salt and magnesium) will rinse off easy with carb spray. Though if you wanna get it super nice and clean, soak all the non-rubber parts in a clean bowl of de-natured alcohol for a couple days. While it's probably not the best, the powder shouldn't screw up the engine. Though I would immediately change the oil. Do a compression test (use a TESTER, not your finger). If compression is good, you're probably fine once you get the carb cleaned up. Also remove the FUEL TANK and FUEL LINES, and REPLACE the lines and clean the tank with fresh gas and carb spray, make sure you clean out the PETCOCK also. __________________ 2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats.
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07-21-2014, 09:08 PM	#2
Madathlon Join Date: May 2014 Location: Redding, Ca Posts: 70	I would pull the head and see what the piston looks like in that case.
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07-22-2014, 01:17 AM	#4
Bvance554 Join Date: Sep 2013 Location: VA Posts: 37	Or put a wrench on the flywheel and see if you can turn it over that way. The throttle is a completely different issue. It must be bound up somewhere.
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07-22-2014, 04:08 PM	#6
Jecklen Join Date: Jul 2014 Posts: 10	So, extremely worried now... I pulled off the carb and the tube going down into the cylinder is full of a white chunky powder... The carb is full of powder as well... What.... the hell. What do I do at this point? Is this even repairable?
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07-22-2014, 06:03 PM	#7
Jecklen Join Date: Jul 2014 Posts: 10	Upon further investigation the carb has that white powdery crap in it, the cylinder head is filled with it but the piston and piston sleeve are clean. Yet again I screwed up, i lubed the cylinder and it rotated freely than stopped... I think I bound up the loos e chain on the crankshaft sprocket... I can't pull the cylinder head off because a frame bar is in the way so I think I have to pull the engine, no idea where to start with that ether.
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07-23-2014, 12:37 AM	#8
Bvance554 Join Date: Sep 2013 Location: VA Posts: 37	WTH is that? It looks like ash. Looks like someone did something to deliberately destroy the engine. But you only paid $50 so I still don't think it would be a terrible deal as long as everything else checks out. I think I'd buy a new engine.
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07-23-2014, 06:44 AM	#9
Jecklen Join Date: Jul 2014 Posts: 10	You don't think it's worth trying to thoroughly clean the carb and the cylinder head?
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07-23-2014, 04:07 PM	#11
Jecklen Join Date: Jul 2014 Posts: 10	Wow, great information! Thank you very much,!
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07-23-2014, 06:53 PM	#12
Madathlon Join Date: May 2014 Location: Redding, Ca Posts: 70	While that is a good thing I would still pull the head, If that gunk in in the cylinder and you get it cranking you can do some real damage ranging from a bend rod to bent valves. Plus it would be so much easier to make sure you cleaned the head fully.
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07-23-2014, 09:20 PM	#13
Jecklen Join Date: Jul 2014 Posts: 10	I just bought a bbk that comes with a new head and jets. Figure best to just replace it for the price. Now I know the 100cc is actually 82cc, what size jet should I have? (purchased a new carb too). Also I may have overlapped the chain on the crankshaft, any ideas for fixes?
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07-25-2014, 03:26 PM	#14
Jecklen Join Date: Jul 2014 Posts: 10	Okay so heres a picture of my chain wrapped around my crankshaft... I've tried everything I can think of to get it off... I tried backing out the flywheel until the bolt just came off. Tried putting bolts in the flywheel and levering off those... I've tried hammering the old piston to back it out, I even tried moving the flywheel forward to just run through the stuck chain... I have no idea what to do at this point... Really really need help.
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