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mazakim
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PostSubject: Segala Persoalan V8   Tue Aug 03, 2010 4:25 pm

Rumah lama :~>> http://125z.darkbb.com/diskusi-bengkel-diy-f5/segala-persoalan-v7-t1029.htm


LC135 is 4-speed and 125Z have 6-speed: Why?

Have you ever wonder about this? Why is it the marvelous and lovable Yamaha LC135 only have 4-speed gear and Yamaha 125Z having additional 2 speed gear? Is Yamaha neglected the important aspect of speeds and thrills? Well, I have been thinking about this for a while and tried to find out why. Here is what I’ve found out…The reason why Yamaha 125Z needed to have 6-speed gear is due to narrow powerband that is natural for 2-stroke engine. 2-stroke engine needs RPM more than 5000 (depends to the cc) to deliver its optimum torque, whereby 4-stroke engine can deliver the optimum torque from as low as 1500 RPM. So, because of this, 2-stroke engine needs to have a lot more gear than 4-stroke engine to make sure the torque can be spreads out all along the speed (km/h) starting from low speed to very high speed.
For example, LC135 can run on 4th gear as low as 20km/h and from there you can also speeds up to 160km/h without hesitation from the engine. Try this on your 125Z, and tell me how does it feels.
As you can see, having only 4-speed gear on LC135 is not a disadvantage, it is the nature of 4-stroke engine that have wide powerband. But, I think it is also not a wrong decision if Yamaha engineers decides to make LC135 being 6-speeder! More power, more fun!


Drive safely!

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mazakim
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PostSubject: Re: Segala Persoalan V8   Tue Aug 03, 2010 4:41 pm

The Compression Stroke

Now the momentum in the crankshaft starts driving the piston back toward the spark plug for the compression stroke. As the air/fuel mixture in the piston is compressed, a vacuum is created in the crankcase. This vacuum opens the reed valve and sucks air/fuel/oil in from the carburetor.
Once the piston makes it to the end of the compression stroke, the spark plug fires again to repeat the cycle. It's called a two-stoke engine because there is a compression stroke and then a combustion stroke. In a four-stroke engine, there are separate intake, compression, combustion and exhaust strokes.
You can see that the piston is really doing three different things in a two-stroke engine:

  • On one side of the piston is the combustion chamber, where the piston is compressing the air/fuel mixture and capturing the energy released by the ignition of the fuel.
  • On the other side of the piston is the crankcase, where the piston is creating a vacuum to suck in air/fuel from the carburetor through the reed valve and then pressurizing the crankcase so that air/fuel is forced into the combustion chamber.
  • Meanwhile, the sides of the piston are acting like valves, covering and uncovering the intake and exhaust ports drilled into the side of the cylinder wall.
It's really pretty neat to see the piston doing so many different things! That's what makes two-stroke engines so simple and lightweight.
If you have ever used a two-stroke engine, you know that you have to mix special two-stroke oil in with the gasoline. Now that you understand the two-stroke cycle you can see why. In a four-stroke engine, the crankcase is completely separate from the combustion chamber, so you can fill the crankcase with heavy oil to lubricate the crankshaft bearings, the bearings on either end of the piston's connecting rod and the cylinder wall. In a two-stroke engine, on the other hand, the crankcase is serving as a pressurization chamber to force air/fuel into the cylinder, so it can't hold a thick oil. Instead, you mix oil in with the gas to lubricate the crankshaft, connecting rod and cylinder walls. If you forget to mix in the oil, the engine isn't going to last very long!

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fareez91
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PostSubject: Re: Segala Persoalan V8   Tue Aug 03, 2010 9:14 pm

huhu..
asal bi?
sape2 ley tlg translate kn x? hhehe..
jap phm jap idak ler.. =)
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azdli90
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PostSubject: Re: Segala Persoalan V8   Tue Aug 03, 2010 9:15 pm

Compression Stroke


Sekarang momentum di crankshaft piston mula memandu kembali ke busi untuk langkah mampatan. Seperti udara / bahan api campuran di piston dikompresi, vakum dibuat dalam crankcase itu. vakum ini membuka injap buluh dan menghisap hawa / bahan bakar / minyak dari karburator.

Setelah piston membuat sampai akhir langkah kompresi, percikan api plug lagi untuk mengulangi kitaran. Ini disebut mesin dua-stoke kerana ada stroke mampatan dan kemudian stroke pembakaran. Dalam mesin empat-stroke, ada asupan berasingan, mampatan, pembakaran dan exhaust stroke.

Anda dapat melihat bahawa piston benar-benar melakukan tiga perkara yang berbeza di mesin dua-stroke:



*
Pada satu sisi piston adalah ruang bakar, di mana piston adalah
mampatan hawa / bahan bakar campuran dan menangkap energi yang
dilepaskan oleh pembakaran bahan api.

*
Di sisi lain piston adalah crankcase, di mana piston mencipta vakum
untuk menghisap hawa / bahan bakar dari karburator melalui injap buluh
dan kemudian pressurizing crankcase sehingga hawa / bahan bakar terpaksa
ke ruang pembakaran.

*
Sementara itu, sisi piston bertindak seperti injap, yang merangkumi dan
mengungkap intake dan exhaust port dibor ke sisi dinding silinder.


Ini benar-benar cantik rapi untuk melihat piston melakukan banyak hal yang berbeza! Itulah yang membuat dua-stroke engine begitu mudah dan ringan.

Jika anda pernah menggunakan mesin dua-stroke, anda tahu bahawa anda perlu campuran minyak dua-stroke khusus dengan petrol. Sekarang bahawa anda memahami kitaran dua-stroke anda boleh melihat mengapa. Dalam
mesin empat-stroke, crankcase sudah benar-benar terpisah dari ruang
pembakaran, sehingga Anda boleh mengisi tab mesin dengan minyak berat
untuk melumasi bantalan poros engkol, bantalan pada kedua-dua hujung
batang yang menghubungkan piston dan dinding silinder. Dalam
sebuah enjin dua-stroke, di sisi lain, crankcase adalah melayani
sebagai ruangan tekanan untuk memaksa hawa / bahan bakar ke dalam
silinder, sehingga tidak dapat memegang minyak tebal. Sebaliknya, anda mencampur minyak dengan gas untuk melumasi crankshaft, menyambung batang dan dinding silinder. Jika anda lupa untuk campuran dalam minyak, mesin tidak akan bertahan lama!
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PostSubject: Re: Segala Persoalan V8   Tue Aug 03, 2010 9:20 pm

fuyo...ad translater...dasat ah...
good info...br ak phm ape yg ak xphm sblm ni
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azdli90
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PostSubject: Re: Segala Persoalan V8   Tue Aug 03, 2010 9:21 pm

paham bagus2...laa ore pasir mas dio nie..baru aku tahu
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PostSubject: Re: Segala Persoalan V8   Tue Aug 03, 2010 10:28 pm

azdli90 wrote:
paham bagus2...laa ore pasir mas dio nie..baru aku tahu

jo lo doh...gegar botol2 budu bawoh glegar buluh dapur hahaha
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ajizaimi
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 12:31 am

salam. aku rasa translate pki google
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ajizaimi
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 12:33 am

LC135 adalah 4-kelajuan dan 125Z mempunyai 6-speed: Mengapa?

Adakah anda pernah bertanya-tanya tentang hal ini? Mengapa di LC135 Yamaha mengagumkan dan dicintai hanya memiliki gigi 4-kelajuan dan Yamaha 125Z mempunyai tambahan 2 gigi kelajuan? Apakah Yamaha mengabaikan aspek penting dari kelajuan dan thrills? Well, saya telah memikirkan hal ini untuk sementara dan cuba mencari tahu mengapa. Berikut adalah apa yang aku tahu ... Alasan mengapa Yamaha 125Z diperlukan untuk memiliki gigi 6-speed adalah kerana powerband sempit yang alami untuk mesin 2-stroke. 2-stroke engine memerlukan RPM lebih dari 5000 (bergantung kepada cc) untuk memberikan torsi optimum, di mana mesin 4-stroke dapat memberikan torsi yang optimum dari terendah 1500 RPM. Jadi, kerana ini, mesin 2-stroke perlu memiliki gigi lebih banyak dari mesin 4-stroke untuk memastikan torsi boleh tersebar sepanjang kelajuan (km / jam) bermula daripada kelajuan rendah ke kelajuan yang sangat tinggi.
Contohnya, LC135 boleh berjalan di gigi 4 serendah 20km / h dan dari sana anda juga boleh kelajuan hingga 160 km / h tanpa ragu-ragu dari mesin. Cubalah ini dalam 125Z anda, dan katakan bagaimana rasanya.
[color:359e=#000]Seperti yang anda lihat, yang hanya memiliki 4-speed gear pada LC135 tidak merugikan, itu adalah sifat mesin 4-stroke yang memiliki powerband lebar. Tapi, saya pikir ini juga bukan keputusan yang salah jika jurutera Yamaha memutuskan untuk membuat LC135 menjadi 6-speeder! Kekuatan lebih menyenangkan, lebih!
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fareez91
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 12:37 am

tah.. lenmcm je bm ko.hehehe..
tp xpe..
phm la gak..
thnkz..
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kenzou
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 12:42 am

canne carb leh tersumbat ea??
kwan aku die nye carb tersumbat...*tersumbat ape pon aku xtaw.die kata tersumbat je.. =_=
die xnek moto tuh da lama da...
mngkin ke sbb tuh??
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fareez91
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 12:48 am

ko servis carb sdh la kn..
setel mslh...
mybe mnyk da kering lngsung kot..

die PKAI KOTAK ANGIN x??
tkut ade bnde msuk kn..
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kenzou
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 1:47 am

dia pkai kotak angin..
moto stended... juz dia jrang pkai sbb die kene blajar kat perlis..
amek matrik..taw2 je la matrik xleh pkai moto... berhabuk moto die blek ari tuh..
enn...
ouh..servis je?
xperlu tukar carb ea??

hehehe...
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paan1171
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 3:54 am

ape nk buat ek.. rpm x lpas 8k.. pling kuat pon dpat 8.5.. cadangan ape yg prlu di modi...
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pais924
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 11:06 am

kalo pam 2t rosak or dh x bleh dipercayai cmne ek.....
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imanhalimi
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 11:11 am

kalu masa yg singkat xnk ganti baru, bancuh la 2t..
sumbat je dlm tank mengikut skala...
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pais924
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 11:24 am

oooo bg2 kaa....maksudnye kne tuka jugak la ek
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imanhalimi
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 11:29 am

pais924 wrote:
kalo pam 2t rosak or dh x bleh dipercayai cmne ek.....

abh da cakap rosak @ xdipercayai kn...
ganti baru kot dapat meyakinkan balik kepercayaan tuan badan terhadap pam 2t 2...
pendapat seposen aku je..
tgu la apa kata otai2 len...
manatau ada cara lem lg..
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chocolate
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 1:03 pm

imanhalimi wrote:
pais924 wrote:
kalo pam 2t rosak or dh x bleh dipercayai cmne ek.....

abh da cakap rosak @ xdipercayai kn...
ganti baru kot dapat meyakinkan balik kepercayaan tuan badan terhadap pam 2t 2...
pendapat seposen aku je..
tgu la apa kata otai2 len...
manatau ada cara lem lg..

aku rasa nak gelak la baca ayat ni

beli pump baru@ servis balik pump tu kot2 cuma tersumbat jer..kl nak pki 2t bancuh,pump tu kene tanggalkan,lubang 2t kat karb kene tutup,kendian tiub 2t dr tank 2t kene tutup gak..kang nnt habis meleleh kuar

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imanhalimi
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 4:10 pm

yela 2 choco...
haha..da dya cakap x yakin n xboleh dipercayai...beli baru jela bagi yakin lek..
wakaka
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pais924
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 5:51 pm

imanhalimi wrote:
yela 2 choco...
haha..da dya cakap x yakin n xboleh dipercayai...beli baru jela bagi yakin lek..
wakaka


btul gak 2....hehe....tp msalahnye br jek tuka 3 mggu lps dh jahanam... Mad Mad .dhla mhl nk mati...2 yg x percaya sgt 2...tp kalo x cbut pam 2t itu ketika 2t bancuh digunekan adakah ia akan mendatangkan ape2 kesan ke ats motot saye Question Question....hehehe...begitu panjang lebar skali persoalan hambe.....
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chocolate
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 7:28 pm

pais924 wrote:
imanhalimi wrote:
yela 2 choco...
haha..da dya cakap x yakin n xboleh dipercayai...beli baru jela bagi yakin lek..
wakaka


btul gak 2....hehe....tp msalahnye br jek tuka 3 mggu lps dh jahanam... Mad Mad .dhla mhl nk mati...2 yg x percaya sgt 2...tp kalo x cbut pam 2t itu ketika 2t bancuh digunekan adakah ia akan mendatangkan ape2 kesan ke ats motot saye Question Question....hehehe...begitu panjang lebar skali persoalan hambe.....

aish camner bleh jadi camtu,xde warranty ke..kl x cabut:
1.kl pump elok lg nnt 2t supply jadi lebih kat engine blok crank,seterusnyer bleh wat plug kong tiap2 hari
2.kl pump elok lg tp 2t dah bleeding kuar habis dr tank 2t,nnt xde lubrication kat pump 2t lantas membuat pump 2t trus jahanam
3.kl pump dah tersedia xleh pki,nnt angin masuk kat bahagian pump 2t tu lantas buat timing engine jadi giler,tetiba jer tinggi masa tgh idle..masa off throttle pun nnt jadi giler,timing ssh nak turun

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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 8:18 pm

paan1171 wrote:
ape nk buat ek.. rpm x lpas 8k.. pling kuat pon dpat 8.5.. cadangan ape yg prlu di modi...

ko nk rpm smpai bape? jom ikut ak gi jmpe pomen ak kat s.alam... kne modi sket... pastu rpm leh cecah 10
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paan1171
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PostSubject: Re: Segala Persoalan V8   Wed Aug 04, 2010 8:22 pm

smpai jarum ptah 12... hahahha ... modal bnyak x... sen xde sgt ni... brape nk stnby...?
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fareez91
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PostSubject: Re: Segala Persoalan V8   Thu Aug 05, 2010 12:35 am

kenzou wrote:
dia pkai kotak angin..
moto stended... juz dia jrang pkai sbb die kene blajar kat perlis..
amek matrik..taw2 je la matrik xleh pkai moto... berhabuk moto die blek ari tuh..
enn...
ouh..servis je?
xperlu tukar carb ea??

hehehe...

ko try servis ja dlu..
tah ade ulat ke bnatang ape msuk kn.heee...
klo x ley gak,mybe laen prob ke..
aku nyer mto dkt sbln x start pon ok je...
skali 2 je start da idup.hee
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