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After 16 years it's back! This thing endured my father, my brother and myself without any real engine work or maintenance. It just kept going. Some of my earliest memories are of my father sitting me on the gas tank and putting around the woods. I still remember back when I was 12 or 13 and kicking it over for the first time and taking off in the woods for the rest of the day - my dad's rule was that if I was big enough to start it, I was big enough to ride it. I've spent the last 2 years slowly dismantling every piece, painting the frame, rebuilding the engine, etc. Thanks everyone. This place was a massive help. I've gone through many years of threads looking for answers and almost always found what I needed - usually answered by feetupfun. It's time to get some proper tires on it, build an airbox and climb some stuff.

As with any question I ask on forums I always find the answer right after posting the question. Found a .pdf of a service manual and it states top ring: minimum 0.3mm maximum 0.5mm second ring minimum 0.2mm maximum 0.4mm I feel much better now, I don't want to be doing this again for a long while. Thanks guys.

I'm a little confused as to what I should run for the ring gap. I'm using an aftermarket wossner forged piston, 71.44mm. Their online ring gap calculator gives the following suggestions: naturally aspirated: 0.29mm (0.0113 in) naturally aspirated racing: 0.32mm (0.0127 in) snow/marine: 0.36mm (0.0141 in) forced induction: 0.39mm (0.0155 in) heavy load/high heat: 0.43mm (0.0169 in) I'm guessing since it's air cooled I should go for 0.43mm (0.0169 in). I've never done this before so I wanted to ask people with more experience than me if this sounds about right. I'm not sure what the oem manual calls for or if it even applies since I'm using aftermarket piston and rings. I just got the case halfs together last night. It's been 15 years since this thing last ran and I'm looking forwards to it, the internals were all original when I took it apart.

Thank you guys very much, I'll give the bearings a shot since I have the original steel inner bushing/tube. Ordered some shocks and misc. pieces as well, shipping from the uk is painful but I can't wait to hop on this bike again. The dualsport just doesn't cut it when it comes to playing around in the woods and climbing obstacles and I miss the sound of a 2-stroke so much.

I've been lurking for a long time and have started reassembly of my ty250A. I'm trying to order parts for the rear swingarm and can't find much information using the site's search. Has anybody had success with this kit that appears to replace the stock bushings and dustcaps with needle bearings and brass endcaps? https://www.francetrialclassic.com/en/frame/4963-yamaha-ty-125-175-250-rear-arm-bushing-kit.html I originally noticed an identical kit on ebay but the description was vague and I wasn't sure if it would fit. This seems to be the only trials specific website that lists this kit, everywhere else just carries the oem style bushings and dustcaps. What do you guys think?