seized piston??

[vad]

i have a tgb r50x 05 plate, has 9800 miles on it. i was riding it last night and my mate slammed on his brakes on a turn, as i was behind him i turned to the right to go around him and a van pulled out. i slammed on my brakes and then let the van go past, when it went past i started throttling and my ped cut out, i pushed it to the side and tried electric starting it but it only made a clicking noise, then i tried the kick start but the kick start wouldn't go down. my guess is i seized the piston

[vad]

the guy i bought it off also said it's got a new engine rebuilt with a new piston and whatever else it needed

[MarJay]

[RhynoCZ]

Is it a two stroke? Was the oil pump working? If it runs premix, did you put the oil in the petrol?
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[vad]

[MarJay]

[vad]

[RhynoCZ]

So the engine might have been freshly rebuilt after all. I wouldn't even bother the previous owner, as you're gonna just look silly for not putting in any two stroke oil.

Lessons learned, time to rebuild the engine once again. Not expensive, not complicated, do it yourself.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[vad]

[RhynoCZ]

I know this isn't much of a help, but when people ask me to recommend them a scooter or a small motorcycle, I always tell them to get a 4 stroke for this very reason.

Don't take this the wrong way, if you know what a two stroke is and do everything by the book, it's alright and some even enjoy the novelty of a two stroke engine. But when people have no clue it may also end up just like yours did. 4 strokes are more user friendly.
____________________
'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[stinkwheel]

[vad]

[stinkwheel]

[vad]

[Pete.]

If you put a 70 kit on it you'll no longer be licensed to ride it. Get caught and they'll hang you for no license and probably no insurance too.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[skatefreak]

It sounds like it has seized but a few pertinent questions, how far have you ridden this bike?
There should be an oil tank that requires refilling ever x number of tanks worth of fuel, and you will have a low oil level light on the dash? Smoke is good (within reason)...

Have you ridden more than a tanks worth?
Was there a light illuminated on the dash?

I rode an NSR for > 4 years and never changed the piston, had it 'nip' a few times over the years but it was not terminal.

It's a bit hard to grasp how people are getting hold of 2 stroke bikes and not getting the basic information? It's not exactly complicated... I mean I assume they can manage to fill a fuel tank?

[vad]

[vad]

can someone help me find a pdf or a website which can guide me through taking off the top end and inspecting it please? i've tried but i don't even know where to look

[RhynoCZ]

You said there was a lot of smoke, maybe the oiler wasn't set up correctly and you burned through the whole reservoir much sooner than anticipated. Either way, any RED light on the dash means stop the motorcycle.

As said, lesson learned and you won't do such mishap again, I do believe that.

Service manual: Google is your friend.

Try this: https://www.scribd.com/doc/26110815/TGB-Service-Manual-101S-BH1-303R-50-BR1-Delivery-50-BK1

And this: https://scootercommunity.com.au/files/folders/tgb/default.aspx
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Evil Hans]

[vad]

[vad]

update: the ped is some how running, i unscrewed the transmission case and tried turning the variator with my hand, it made a noise and then it started turning, where as previously it wouldn't turn. i try to electric start it but it doesn't get a kick, it tries to start (what my mate said) but apparently it's just missing that extra kick (i think there's not enough compression) so we try to kick start it and then it starts running, i rode for about a mile without a problem, didn't try going any further as i have barely no oil (gonna buy some in the morning)
do you guys still think i'd need a new top end? and my friend also said that if the cylinder is scratched and i keep using the moped (even tho it still runs) that it will mess up my entire engine? is that true or not? thank you

[skatefreak]

If the cylinder is scored it will ruin a new piston so if you get the top end off and check the cylinder and it's fine you can get away with just a piston else it will need to be both.
Pistons (and somewhat cylinders) are considered consumables with 2 strokes so are priced accordingly, I can't see a scored cylinder damaging a whole engine though maybe the cylinder head as well but mostly it will ruin your piston...

The the top off, take lots of pictures and put them on here.

A new piston and or cylinder may get it running nicely again but it is important you find out what caused it to stop running in the first place if you want it to be reliable and last!
If could be the previous owner ran it with low oil or there is a problem with the oil system, badly adjusted etc.

I rode a 2 stroke NSR 125 for 4 years and gave it plenty of abuse. Still has the same piston in there!

[vad]

does anyone know where i can find how to derestrict the moped? i want to put it up for sale or swaps for a geared but no one is interested in a restricted bike, i tried typing the model into youtube and google but i don't seem to be getting lucky,

[RhynoCZ]

Leave it as is or fix it. Don't bother polishing your lemon for someone else. It will sell, I'm sure about that. It might take some time and you might be losing money, but it will sell.

Also, I hope you tell who ever you're selling it to, that it was seized, if you decide to not bother with sorting this out first.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor