SR 125

[jb57uk]

Hi all , anyone got the valve & Tappet settings ?

for a sr 125, thanks,,,

[jinxed]

Hi all , anyone got the valve & Tappet settings ?

for a sr 125, thanks,,,

In my experience, the valves are broken and the tappets are not tapping. Also, my feeler gauges are rusty, so my clearances are "some". I've been hunting for a (dodgy) service manual for this model for a while, so far without luck. The user manual doesn't help:

"Valve clearance adjustment

The correct valve clearance changes with use, resulting in improper fuel/air supply or engine noise. To prevent this, the valve clearance must be adjusted regularly. This adjustment however, should be left to a professional Yamaha service technician." Should add "And not you, spotty!", shouldn't it?

I found clearances for the XT225, which (I believe) is very similar:

Valve clearance

inlet 0.05-0.09mm

exhaust 0.15-0.19mm

As it's not a high performance engine, clearances of this size may suffice. Make sure the locknut is tightened securely though - I took an oval locknut out the head of an SR engine only recently; it must have worked loose.

If you find out what the clearances should be, me too!! ME TOO!!

[sr125shell]

Haynes manual says;

when engine cold;

Inlet = 0.05 - 0.09mm (0.002 - 0.003 in)

exhaust = 0.11 - 0.15mm (0.004 - 0.006in)

hope info helps!

[jinxed]

Thanks! How about doing a page per week? In three years, I should have the complete manual!!

Does the manual happen to mention what size puller is required to remove the magneto?

[sr125shell]

Thanks! How about doing a page per week? In three years, I should have the complete manual!!

Does the manual happen to mention what size puller is required to remove the magneto?

I used a 16mm to remove mine