Hi i am new to this forum so sorry if my post is in the wrong place,

I have a 1995 yamaha sr 125 which recently has had engine failure, now can someone please tell me if a 2002 yamaha sr 125 engine will work in my 1995 bike as no dealers or even yamaha its self can tell me the answer.

Thanks

Alex

Short answer is no , you either will have to swop flywheel & stator + cover or wiring harness .

Any other questions check here first , its nice to be nice & yes you should have posted in the workshop

http://www.yamahaclub.com/forums/forum/48-noobs/

Thanks for the help, im going to have to just save for a new bike then

It's not a hard job realy , to swap the the stator & flywheel , with a puller .

Thanks, yeah i was just worried didnt want to really spent 200 pounds on engine on ebay and 100 pounds on labour for it to not work

I just bought a whole SR125 for £60 dunno what it is like though it has not run for 2 years

pick it up tomorrow evening, spannering begins friday ,

Merv

Oh cool there such nice bikes to ride, have you got any idea if the 2002 engine would work in mine?

Hi Alex a proper intro is always welcome mate

so you have engine failure eh? thats more than a little vague

tell us what you know about it, maybe its not terminal as you are suggesting.

...Paul

Thanks, yeah i was just worried didnt want to really spent 200 pounds on engine on ebay and 100 pounds on labour for it to not work

If everything is ok with the bike apart from engine go for it , there should be no reason for it not to work , your old unit will power the bikes electrics

& if it was ok before it should be in the new one , It is the only major difference, plus the new one will have automatic cct which is a plus & a different

carb that shouldn't be an issue & work near enough the same , They are very prone to top end failures, regular oil & filter changes valve clearances will

prevent that , you could refit the new flywheel etc to the old lump & sell it to get some cash back ?

Good luck with it

Haha yeah sorry the shop just to me its bottom end failure and would cost hundreds to fix and suggested getting a new engine but im finding it really hard to find them for my bike and the only one was from a 02 which the bikes look the same but yamaha or other deals werent sure if it would work

Alex

wel hang on til i get this thing and see if it is any good, if the thing is going to cost too much to get on the road i may be able to sell the motor to ya if that is any good

merv

Thanks for all your replys guys has anyone else got any ideas? thanks

what part of country are you - I have an old SR125 engine ( I replaced it because it was top end slap noisy ) and its sat in shed for a good 3 years but maybe 2 can make one good one ? Its free if you can collect - kent

hi guys sorry to post here i have a yamaha sr125 the aa said theres no compression and the piston has hit some thing in the exhaust (missed timing) any help would be great thanks

maybe it dropped a valve, come on now it's time to get the tools out and check

i think thats what the aa said the piston had hit the valve in exhugst but not sure where to start lol i am a noob when it comes to engines ? any help plz lol

take off the inspection cover over the exhaust valve first and have a look to see if it looks right and the valve is moving ok when the engine is turned, you shouldnt have much gap between the tappet and the valve when the piston is a tdc on the compression stroke although i dont know what the gap should be myself!

I get a feeling though that youre such a noob youre gonna struggle with all of this because lack of tools/experience/manual etc!

ok thanks for the info il have alook on the net for more info thanks again

Valve clearance (cold):
Intake valve 0.05 to 0.09 mm
Exhaust valve 0.11 to 0.15 mm

Take out the spark plug.

Remove the 2 inspection covers at the top of the engine - the tappets are behind these.

On the left hand side of the lower engine there are 2 circular inspection covers. These have slots in them to allow them to be unscrewed. One in the center of the casting and one above it. Undo both of these.

The center cover should reveal the bolt on the end of the crank. You need to get a socket in here to manually turn the engine (anticlockwise).

Turn the engine until in the smaller inspection hole the pointed is aligned with a mark on the part that is turning.

When these marks aligned, adjust the tappets as above.

When you are turning the crank, both the tappets should be moving.

thanks for the help guys