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For me it's gotta be Zach Osborne's 2017 Las Vegas comeback ride. Wrecked on the first lap, his bike pinned under another riders so the time loss was that much greater, rode like his life depended on it all the way to Savatgy and full sending it on the 2nd to last corner on the final lap to win the championship. Absolutely wild night.

Just spent the weekend riding with my daughters got about 30 miles in out in ocotillo. The youngest rides a 110 around camp and switches to her 250 quad for the longer rides oldest is on a 140 with the 21/18 wheels. They stick the trails and I venture of the main line to keep it interesting.

Get the trail bike, it’s their turn

similar situation got a 6 yr boy and life is super busy.i sold track bikes and bought enduro bike, that way i can nipp out for an hour or 2 ( not that i do that much ) and i dont have to make a day and can use the enduro for both lanes and track if i wish to. at 48,i bought my dream bmx so i could spend more time t gether down the track with my lad, that way we both get to play

I had 3 kids on washer stacked 50's at the same time. That was brutal. I should've kept riding.

It was fun until he got on the KTM 50 with the washer stacks for the clutch. I couldn't wait until he got off that bike.

When the kids were younger, id tried a full size bike, sort of sucked same as you experienced. Id go with a smaller trail bike or pit bike. I have a YCF bigy 190, with 19x16 wheels, perfect bike for my to have fun on and easy enough to trail ride. A lot less expensive than a klx140, which i think is a good bike fpr what ypu want too. Kids grow fast and would probably grow into either in a few years if ypur still just playing in the trails. For me the 110 size bikes are too small...

And some of their best days too, even if they don’t know it yet.

I have a KLX110L and some days I wish I had a CRF125L or KLX125 just for the slightly larger frame. I'm short and the KLX110L is fun to ride/race but my legs cramp just sitting around going slow/ trail riding on it. I also built an electric full size bike using Electro and Company kit. Kind of expensive but its silent, runs forever just creeping around. It's quiet and a full sized bike. Easily my favorite play bike now.

Beta 200rr. You can putt around all day if needed. Electric start. Kick stand. Super light..... this all matters when you're on and off your bike every 5 minutes. Yet, if you have time to grab a handful... it's still a blast.

Some of the best days of my life have been spent watching them ride. I spun laps while they were resting and eating uncrustables. 😉

Race bikes will never be as fun to ride slow as an air cooled trail bike. I have a ttr-225 and a Chinese crf50 clone that I ride around with my kid while he's on his crf110. To me at least it's way more fun and the suspension and low ground clearance keeps me from getting too dumb while playing riding. If I'm on my 450 I get board and always end up doing something stupid, I've had worse crashes riding slow than racing 😅.

A Fan and a Quiet pipe on his KX250F could be the cheapest way for the OP - while retaining a bike that can be raced at the level he's been at. Evans coolant can be useful, but, I didn't start using until well after I put Fans on my CRE500 ( didn't want to just 'hide' the boiling problem) - and then only because it suddenly appeared in my local Auto store, for a reasonable price. Though, 'Foo Foo' bikes are quite fun. And, can be kept in the Family, for others use / your youngsters use as they...

I’m 38 with kids 12 & 9. We are just weekend warriors. My son (9), has been riding/racing a pdub all the way to 65 now. In the beginning I got a 110 to chase them. Once my son got a little quicker I got a klx140. Having a kick stand also comes in handy to pick them up off the ground. Eventually the kids started riding the 110 and 140, so they will get many years of use.