Zongshen 125-30 problems

So, I have problems with my zongshen 125-30

When it is cold it starts without problems but when it is hot it is really hard to start it, almost impossible. If I turn carburetor so it is working with small number of rpm when idling it is little harder to start if it is cold but it is easier to start it when hot, so that's the compromise for now, but it is not satisfying.

Despite that, bike is running well when started and except that I do not have any problems with it.

So, could someone please help me?

Hi excrucio, this is a common problem with Chinese bikes and is easily fixed but you will need some special equipment. The first thing you will need is a jack or other form of lifting device such as a rope or even a strong woman. I see you live in Croatia so I think you have plenty of strong womens there.

Ok so lets begin, first you should attach your number plate to your lifting device or if you are using a strong woman have her grasp it firmly. Next find the attachment bolts for the number plate and carefully undo them, at the same time supporting the plate. What you are aiming to do is raise the plate high enough that you can remove the motorcycle from under it.

Then simply discard the whole motorcycle in a landfill or fire if this is allowed in your area. Now all you have to do is buy another motorcycle preferably of Japanese origin and gently insert it into the area under the number plate, carefully lower the plate and attach it using a pair of 6mm bolts and some self locking nuts.

Hope this sorts out your hot starting problem, let us know how you get on.

Do you use the choke properly? User manual has often errors in that matter.
Before you try to start the warm engine, set the chocke lever in opposite position. Maybe the choke is "permanently ON".
This is my first thought to your problem.

How is it with fuel consumption?

The secound though is, maybe you should set the valve clearence. It could cause simmiraly problems.

Btw. under which make is sold the Zongshen in Croatia? In Poland it is sold as Junak 131.

Yes, I am using choke properly. In summer I do not need it at all when starting cold.
And, when starting hot I even have to use choke to start it (if carburetor is not set up like I described).

Fuel consumption is about 2.5-2.7l/100km (I think, never measured properly.). Setting valve clearance is tricky because I do not have service manual and I haven't ever done that.

It is sold as Zongshen :D

Valve clearence you can take from any honda CG manual. I think it was 0,08 to 0.1 mm on both valves.

The fuel consumption shows that the engine has not too much gasoline.

Quote:

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Originally Posted by beniamin82

The fuel consumption shows that the engine has not too much gasoline.

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What do you mean by that?

Too low consumption?
From user manual is 2.2l/100km.

No. I meant it is ok.
If he would be use 3 to 5liters it could show us that the carburetor seting is wrong, or the air filter is full of dirt.

Set the valves and write us if it helped.

Da se ne bih mnogo mučio sa mojim očajno lošim engleskim jezikom, da kažem ovako: ja bih kao prvi korak preporučio jednostavan metod za podešavanje klasičnog "fergazera" sa cilindričnim šiberom, kakav je verovatno na tvom "Zongu", koga smo već pominjali na forumu - http://www.mychinamoto.com/forums/sh...e-Basics/page6

Znači, obezbedi da pre samog podešavanja sve bude u redu, pa tek potom kreni u podešavanje.

Ma imam jedan vijak na karburatoru koji je dugačak i ima na sebi oprugu. Mogu ga rukom okretati i to sam i radio. No, ima još jedan...

Koji da okrećem? I za početak kako da namjestim taj s oprugom. Da bude mali ler, da bude veliki ler ili nešto između, da se fino čuje mašina, ni previše ni presporo?

Quote:

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Originally Posted by zhu

Hi excrucio, this is a common problem with Chinese bikes and is easily fixed but you will need some special equipment. The first thing you will need is a jack or other form of lifting device such as a rope or even a strong woman. I see you live in Croatia so I think you have plenty of strong womens there.

Ok so lets begin, first you should attach your number plate to your lifting device or if you are using a strong woman have her grasp it firmly. Next find the attachment bolts for the number plate and carefully undo them, at the same time supporting the plate. What you are aiming to do is raise the plate high enough that you can remove the motorcycle from under it.

Then simply discard the whole motorcycle in a landfill or fire if this is allowed in your area. Now all you have to do is buy another motorcycle preferably of Japanese origin and gently insert it into the area under the number plate, carefully lower the plate and attach it using a pair of 6mm bolts and some self locking nuts.

Hope this sorts out your hot starting problem, let us know how you get on.

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I have done this many times now and has worked out every time, but I would recommend using none Chinese made number plate bolts , 2 times now I have found that the police don't take kindly when I have been stopped on my bike without the number plate , on both occasion when I have explained to the police that the number plates was held on by Chinese made bolts there let me go with a stiff warning in future I must use Loctite

Quote:

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Originally Posted by excrucio

Ma imam jedan vijak na karburatoru koji je dugačak i ima na sebi oprugu. Mogu ga rukom okretati i to sam i radio. No, ima još jedan...

Koji da okrećem? I za početak kako da namjestim taj s oprugom. Da bude mali ler, da bude veliki ler ili nešto između, da se fino čuje mašina, ni previše ni presporo?

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Taj sa vijkom i oprugom ti je za tzv. ler-gas, prazan hod ili idle na engleskom. Zagreješ motor na radnu temperaturu, pa zavijanjem tog vijka povećavaš obrtaje motora i obrnuto. Treba da postigneš da je ler-gas stabilan i da se zagrejan motor ne gasi (hladan može i da se gasi, ali to nije mana). Za taj motor, neki OK ler-gas je 1700-2000 obrtaja (ako imaš iole korektan obrtomer na motoru), znači ne prenisko, da bi pumpa za ulje ipak stabilno pumpala ulje kroz motor.... mislim, skapiraćeš šta je korektan ler-gas i bez mojih saveta.

E sad, dosta toga zavisi upravo od onog drugog vijka i njegovog položaja. Njegova uloga je da podesi optimalnu smešu vazduha i goriva na niskim obrtajima (na višim, tu ulogu preuzima onaj konus na igli karburatora, a potom, glavna dizna (sapnica)). Na linku na koga sam ti ostavio, postoji to uputstvo za podešavanje karba u nekoliko jasnih koraka ( http://www.mychinamoto.com/forums/sh...ll=1#post46310 ), pa sledi proceduru i rezultat ne bi smeo da izostane. Ponavljam, prethodno moraš ispuniti sve uslove koji su u uputstvu pomenuti: ispravna svećica, čist karb i filter itd.

Taj motor na tvom "Zongu" je klon starog motora sa "Honde" CG 125 i teško tu nešto mkože da ne radi korektno. Ima i snažnijih, modernijih, uglađenijih (OK, tvoj ima balansno vratilo koje ubija vibracije), štedljivijih motora, ali ovaj ti je nešto kao "Tomo Vinković" na dva točka - napravljeno da radi uz minimalne troškove. I što je bitno, gdegod da nađeš neke korisne informacije, priručnici za ko zna kakav motocikl i njegov motor, a da, kao i na tvom, postoji to sjajno dugme (gumb) na levom boku cilindra - ne libi se da ih sačuvaš. Mogu ti biti od koristi.

Hvala.
Kada budem doma za 10-ak dana, probam. Prvo ću očisitit karburator (valjda ću znati...), pregledati svjećicu i filter pa se idem zezati s tim.

Quote:

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Originally Posted by Zorge

OK ler-gas je 1700-2000 obrtaja (ako imaš iole korektan obrtomer na motoru), znači ne prenisko

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I da, nemam obrtomjer...

Bi li mogao ugraditi ovo:
http://www.ebay.com/itm/DC-12V-Unive...3494c9&vxp=mtr

??

Iskreno - ne znam.

Meni je elektrika još uvek nešto što nikako ne diram dok se ne pokvari, a kada se pokvari - imam auto električara na početku ulice. :icon10: