Can anyone tell me what the valve clearances are meant to be? It sounds slightly tappy in the head wondering whether this is normal as i've not had any experience with old yamaha four strokes. Cheers, Chris.

Best bet is to hunt down a haynes manual for it

saves alot of time and money

In the Yamaha data book I have it say's XT125 (12V) 1982 - 1983

Valve clearance (engine cold)

Inlet 0.05 - 0.09mm or 2 to 4 thou

Exhaust 0.11 - 0.15mm or 4 to 6 thou

Tony

Thank you Tony, great help!

Hi Sir Tony,

You have mentioned that you have a Yamaha data book.

If you don't mind my asking sir, would you pls tell me where did you bought that data book?

I have a yamaha stx 125 and I just want to know how to adjust my valve clearance and carbs air/fuel mixture.

Thanks in advance!!!

Regards,

Maxwell

Hi Maxwell

The two data books I have I got off ebay a few years and only cover models from 1979 -1983 and 1984-2001 and were originally issued to Yamaha dealers as quick referance books. They are only data books with service data settings and don't actually tell you how to do a specific job. Do you have a Yamaha dealer near you who will give you the settings but obviously he will be doing himself out of a job and might be a bit reluctant. Haynes don't seem to list that specific model. The options would be to see your dealer and see if a Genuine Yamaha workshop manual is available but these are usually quite expensive or to see how much he would charge to do the job.

Tony