Blown rings? - Suzuki TF125

[DeadeyeDent]

cheers for all the replies so far guys - learning a lot from this thread and google/you tube!

Pretty sure there is no water in the fuel as the bike is kept in a garage and I filled it up with the same fresh fuel I used recently for the lawnmower which has had no issues. I did notice when I took the exhaust off there was a lot of loose carbon falling out of the exhaust - a few gentle taps with a hammer and a fair few big chunks were falling out. Anyway to give them a good clean or need to bite the bullet and look at a new one?

Will check the gudgeon pin etc. tonight when I get home from work and see if there is any slop in there.

It still has the separate two stroke oil tank. Assuming I get it up and running again is it an easy task to simply block this off and pre-mix the fuel and oil? Id much prefer the manual mix method for peace of mind that the oil is definitely getting in there.

[unstuck]

Blocked exhausts on 2 smokes can rob you power and cause all sorts of problems. Clean as much as you can out, then try it again. Easy enough to disconnect the oil pump.

[Jjgres]

I don't know about your bike but some Suzukis have a oil feed directly to the crank bearings. If you run pre-mix they may not get enough oil.

[ktm84mxc]

Yep just cutting of the oil feed line will lead to other issues mainly the crank assbly not getting enough oil for the bearings to survive .
De-coke the exhaust, there's plenty of threads on here on how to do it.
Buy a new air filter and use it as per the owners manual, if not use a proper filter oil and when its dirty clean and re oil.
Fit a new top end-piston,rings,gudgeon,small end bearing,gaskets don't forget the exhaust gasket.
And it'll run for another decade.

[DeadeyeDent]

Yep just cutting of the oil feed line will lead to other issues mainly the crank assbly not getting enough oil for the bearings to survive .
De-coke the exhaust, there's plenty of threads on here on how to do it.
Buy a new air filter and use it as per the owners manual, if not use a proper filter oil and when its dirty clean and re oil.
Fit a new top end-piston,rings,gudgeon,small end bearing,gaskets don't forget the exhaust gasket.
And it'll run for another decade.

Hey thanks for this - sorry for my late reply Mrs has been admitted to hospital with pregnancy complications and aside from travelling to Dunedin and back I'm now doing the solo dad thing so this repair project is likely to go on the back burner a bit. I think I will leave the oil feed line to avoid causing any other issues. I have been pricing up the top replacement parts and have found a few options for piston/rings/gudgeon pin sets online but none of the depictions seem to have the small end bearing - does this usually come with the sets or do you have to ask for and order this part separately?

Also, and this may be a bit of a noob question but the crank when I pushed it up and down and was looking for excessive play was becoming coated in oil - presumably it can only be transmission oil and I was wondering if this should be present? My understanding was that transmission oil should only be in the trans/clutch pack and the engine/crank is lubricated by the oil in the fuel mixture, is this correct?

Also if anyone knows where I can get a workshop manual for a TF125 id be grateful for a point in the right direction as I can find one anywhere.

[ktm84mxc]

A thin film of oil on the crank assmbly is normal , excessive amounts can mean a leaking crank seal allowing gearbox oil to be sucked in this normally shows up as excessive smoke from the exhaust. Small end bearings normally not included in top end piston kits and have to be purchased separately.
Haynes and Clymer should do a service books on the TS/TF models check Technical books etc .
I can handle a top end rebuild and general repairs my self and only seek expert or shop work for case splitting , shock servicing etc. The joys of 2 smoke ownership.