DT125R ARCHIVE

zander · DTR Senior Member

Removing the cylinder and cylinder head

the only way is YAMAHA DTR · Guru

haynes manual,

drain coolant

i removed tank, fairings powervalve servo

removed head bracket

removed head nuts with combi spanner

kick the engine over and pop the head off

remove cylinder nuts and make sure piston is at bottom of the bore

slide barrel up off

remove piston circlip

http://www.youtube.com/watch?v=xFrLH_kREsw

zander · DTR Senior Member

Alright, thanks so much :) very helpful.

How did you do when you put it back togather then? I've been told to use a torque wrench when tightening the bolts back. Found the values in the workshop manual.
Problem is , I find it really impossible to fit a torque wrench at where those bolts are. I know there are certain adapters and sleeves, but I don't know any that would fit there.

NORFE · DTR Trusted Engine Builder

the only way is YAMAHA DTR wrote:
haynes manual,
drain coolant
i removed tank, fairings powervalve servo
removed head bracket
removed head nuts with combi spanner
kick the engine over and pop the head off
remove cylinder nuts and make sure piston is at bottom of the bore
slide barrel up off
remove piston circlip
http://www.youtube.com/watch?v=xFrLH_kREsw

good video that for any one wanting to do it

the only way is YAMAHA DTR · Guru

well i have a good feel for tightness and didnt have an adapter for my torque wrench so i didnt use it and it has been fine,

Calum122 · Guru

I did mine ****ing tight. Should be fine mate. Take lots of photos and keep everything in good ordered fashion. It really isn't too difficult. I always find it's good to lightly skim the head and cylinder to ensure no gasket has been left on. Also make sure you use genuine yammy head gasket. That is an absolute must!

Make sure that the arrow on the piston points towards the exhaust port.

NORFE · DTR Trusted Engine Builder

iv got various adaptors for torque wrench

just wels some half inch sockets on the end of spanners leave the ring end for the nuts like this

zander · DTR Senior Member

I see.. I'll have a friend of mine coming over today and we'll start make things happen :P

Btw didn't you guys use a torque wrench?

NORFE · DTR Trusted Engine Builder

NORFE wrote:
iv got various adaptors for torque wrench
just wels some half inch sockets on the end of spanners leave the ring end for the nuts like this

yes this is a torque wrench adaptor

Calum122 · Guru

I didn't bother mine runs fun. Just make sure you tighten each nut evenly upon rebuild.

zander · DTR Senior Member

My brother bought a small torque wrench yesterday, gonna borrow his :)

When I ordered the piston I forgot to order the small end bearing aswell -.- so I ordered one
yesterday so I can put things back togather.

Calum122 · Guru

Tidy mate. You got geniune head gasket yeah?

Be pointless otherwise mate. Honestly. It's like £15 for a genuine one and it'll save you a lot of time. Ask anyone on this forum!

Ralzy · Guru

Calum122 wrote:
Tidy mate. You got geniune head gasket yeah?

Be pointless otherwise mate. Honestly. It's like £15 for a genuine one and it'll save you a lot of time. Ask anyone on this forum!

Agreed I had probs with using pattern head gaskets a geniune head gasket is best used smile

NORFE · DTR Trusted Engine Builder

dont for get to re-torque the head/barrel fastners after the first runing off the engine !

fused420 · DTR Senior Member

NORFE wrote:
iv got various adaptors for torque wrench
just wels some half inch sockets on the end of spanners leave the ring end for the nuts like this

Brillant idea that!

When i done my top end i used a torque wrench for the cylinder head bolts, and a ring spanner to bolt the barrel down, alls good so far.

And deffo genuine head gasket ftw

zander · DTR Senior Member

Calum122 wrote:
Tidy mate. You got geniune head gasket yeah?

Be pointless otherwise mate. Honestly. It's like £15 for a genuine one and it'll save you a lot of time. Ask anyone on this forum!

Yup, I bought genuine gaskets