Illegal Yamaha 125Z Racing Bike

July 20th, 2008 3:27 pm by

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What was modded on that bike…?
block and piston
– Original Yamaha 125zR block.
– Bored tu 57mm using DT125(enduro) RK brand piston.
– Ported and polish the block.

Engine head
– OEM header.
– Skimmed the header and polished it.

– Standard Y125z manual clutch system.
– Original Yamaha friction plate.
– GT Racing clutch springs.

Actually that bike got 2 carburetor unit.
– Carb Mikuni for Suzuki Panther 150. [Main jet 300, pilot 28.5]
– Keihin PWK 28mm. Ported to 30mm. [unknown]
– paired with FCCi Racing reed valve.

– Fully Standard. Even the CDi is standard.

– BM Power + YY Pang exhaust manifold + custom made end can silencer.

– Standard OEM front and rear suspension system.

Final drive
– Using 15/34 MCS sprocket setup with TP Racing 415 chain.

– COM* 17×1.4 alloy rims with hi-polish 125z hubs.
– Camel 50/90 tyre. very2 kecik punya tayar.

– Standard front disc brake system.
– Rear disc brake system was removed due to no use of using it.


– None. This bike was staying in the house all the time except when it was needed on the road.

Which shop do all this ?
– my friend’s house. Of coz la this is his bike.

How fast can it go ?

– 180km/h on 4th gear. after that cant calculate due to meter limit is only at 180km/h.
– 16sec for a kilometer.


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13 Responses to “Illegal Yamaha 125Z Racing Bike”

  1. 135lc JB says:

    In Johor,the new model of 135lc modified and reach up to 267km/h with custom made Thailand parts.You can find in Skudai.Owner is a chinese.The bike was also fully modified with Racing Boy parts.If you have $$$,confirm everything you can reach but also have limit la…

  2. Kishan says:

    hi chesecake,
    no offend too, but i own a 125z as well, and modification few years back while i was in kolej, used RX-Z carberator, with LC piton, one piston ring, sprocket 14/35, and my 4th gear was hitting the 180km/h already, and can easily exceed 200km/h when using 5th & 6th gear, i tried with RR & RX-Z & is possible, when i ride, i use only upto 5h gear, 6th gear is too fast already bro, so yes, it is posible bro….and the feeling is wow!laju!!!!!!!!!!!!!

  3. eddy says:

    Why not, CheeseCake?

  4. CheeseCake says:

    No offend bro but 180km/h on 4th gear is impossible based on your mods. Again it is impossible to go 180km/h on 4th gear based on your mods.

    If u said 5th gear at 180km/h then i believe. 5th gear can go even faster than 180km/h.

    But if 4th gear happen to go until 180km/h on your bike, then it must be something with your speedo.


  5. sayrool says:

    125z kome parak gler minyak,kalo nk tuning kasi jimat ckit cmne bro?

  6. york says:

    bahagian enjin apa yang nak di ubahsuai dan di install dengan part apa,coz motor masih original belum di ubahsuai lagi

  7. york says:

    apa part motor yang perlu di tukar untuk menjadikan motor power kuasa enjin dan apa nama part dan motor yang nak di ubah suai ialah y125z

  8. Bro says:

    kalo ko xnk usik block susah kate ko cari block len je jgn gune yg ori.ko adjust block ckit je n tkr spoket mmg leh mkn la stkt rxz..

  9. Anonymous says:

    dekat sarawak SS2 dapat cecah 235KM/j
    135LC kat sarawak dapat main 125z…
    LC tu cc die 210cc…entah apa mende dia orang ltk dalam LC tu

  10. Razi says:

    Salam bro..

    Aku nak tolak Performance Carburator Mikuni TM Flatside. Ukur lilit antara 34 ke 36mm aku tak sure tak ingat. Berminat email kt aku

  11. FiQ_x says:

    i use y125z..i jus wanna make it a little bit fast..boleh makan rxz sudah la…but without touch block(mengusik block moto,jus kai standart jerk block)..
    apa yg perlu wat ek??
    tolong beri nasihat..

    -fresh border-

  12. Halole says:

    i don’t know. you need the read the original source of the article. IMHO, i think a lot of race is won.

  13. rem says:

    how many races won by using this bike? huhu.respect ah,nice mod

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