Time to change wheels and ...

[Yegor]

@declan ok thanks, I think the same. But in PJME you can find the Genuine Yamaha base gasket and is the same that I have , made of metal ( I think steel )
http://www.pjme.co.uk/acatalog/4FU-11351-00.jpg

@Calum thx , I will pay attention to ring end gaps. And have bought the Athena head gasket and the original yamaha water pump radial shaft seal.

@terry-tz Thanks , will try read it in English ( I'm from Spain) , and find some literature in spanish.

Now I have disassembled the carburetor and I have understood much better how it works and how they connect the holes. this video helped me a lot:
Chicho Lorenzo ( Lorenzo's father MotoGP)
https://www.youtube.com/watch?v=niNn0LZESfg

My questions are. Our Mikuni carb ( TM 28 ) main original jet is 180 ?
in this webpage you can see specs and the main jet is 180 .
-> https://www.japanbaiku.com/mikuni/mikuni-tm/mikuni-tm28

. Now I have seen that I have 240 all this time , without problems. With the Romeu exhaust will try with 250/260. BUT this jet :
https://www.japanbaiku.com/image/cache/data/chicles_tornillos/kys-00b-500x500.jpg <--- ralenti/starter jet ? the original is 15 . will try 17.5

where do you buy jets kit ? www.japanbaiku.com is a little bit expensive.

Thanks in advance !

[Calum]

@yegor Hi bud,

240 main jet is fine, in your climate it probably about right. In colder climates then you would want to up jet slightly.

Jets are expensive, I cannot stress enough how important it is to buy genuine jets from reputable sellers.

[terry.tz]

@Yegor if your Spanish don't bother reading that old notebook crap it got everything you need to know but badly rote and explain get something in your native tongue

[Yegor]

@calum yes. those are original Mikuni jets. But what size is the ralenti jet ? 25 or 15 or what ?

( https://www.japanbaiku.com/image/cache/data/chicles_tornillos/kys-00b-500x500.jpg ) thx!

[Calum]

@yegor Pretty sure that's called the atomiser. No idea what a ralenti jet is, neither do I know what size it is. I don't run a mikuni carburetor so I cannot help you I am afraid.

[Yegor]

@calum I was researching. I think in english is called " Pilot jet " and Mikuni TM28 pilot jet size is 15.

[Yegor]

sorry, the DT 125 "R" version is 17,5 pilot jet.

[Yegor]

Hello, I don't know if is good idea to write in this thread . Today I was checking the oil pump and I realized that the color of the oil changed: it has a suspicious color )
( I have put a transparent tube to check the oil flow)

I think it's because of oil seal or o'ring

11. O-RING
-- 13. OIL SEAL

WHat do you think ? Thanks in advance

[Calum]

Is the pipe suitable for oil?

[Yegor]

@calum said in Time to change wheels and ...:

pipe

you mean that if the material the tube is made of is the right one ? the #3 in the picture.

I put the tube yesterday to check the pump, later I will put the original. I'm going to add oil to the gas tank. 100 ml of oil for 5L gas. ?
with new cilinder and piston ...

I started the bike yesterday after installing the piston

[Calum]

@yegor Yeah, it's gotta be suitable for oil.