lineaway

Except for the leaking fuel tanks.

Kids have always ridden the crap out of bikes. We did have more than a decade where fewer kids actually rode bikes for fun. Could be the push for more bike paths and watching the extreme sports more. The only kids that have ever progressed from bicycles to trials were son`s and daughters of trials riders. Reality still is the money for the bikes come from men older than 30. And most trials riders are older than forty. The latest trend is more grand father`s are still riding and footing the bill for the grand kids to join them. In our club the problem was so many riders never had kids. The one`s that did have kids are the people who keep the club going for the next generation of life time riders. PS You do not want to see what they teach now. Barely anything the correct way. Try to find a kid that can tell time or do any math.

It is fine, I just looked at my son`s bike,and it is similar. The photo magnified makes it appear worst than it is. The pipe is in all the way and no leaks. Go ride it!

Have you ever dropped the bike? Exhausts move all the time on all bikes. Unless they just sit in the garage. No oil, no problem.

Well you could look it up through the parts manual.

I would say you need a heavier spring in the rear.

Hate to tell you but you caliper is on wrong. Hard to tell by the picture. I bet if you roll the bike backwards with the brake on the caliper moves with it. The brake arm is usually flush with the swing arm . There is a bolt that breaks off, quite common.

That second hole is to get at the bolt on the shifter.

In the real world, adjustment needs to be a straight wheel and chain. You might make sure everything lines up. The snail cam marks are just for reference.

https://advrider.com/f/threads/chain-tension-adjustment-noob-question.875147/ you might take a pic of your rear wheel set up. what were you doing when things went bad?

You cannot see the guard is not square. Let me hold my light closer.

Seems you have the chain too tight? Eh? Like I said, better off loose.

Not looking at no picture. I have had many of the apart.

Actually the noise could be the shifter as it is not all the way on the shaft.

I think there were two plastic rivits that hold the guard square. Also your shifter sits too low.

Yeah. And the guard does not ride straight.

Look at your first picture. The swingarm guard is loose and you are missing the screw that holds it in place properly. The guard looks to be riding all wrong. Remember when on the bike the chain rides different. Too loose of chain is better than too tight.

The flywheel shears as the engine shuts down. Pull the exhaust header. Look at the piston and rings. You have likely nipped the piston. The cylinder should still be good, but new piston and rings. P.S. Hydrochloric acid can clean up the aluminum in the cylinder.

Bet there was not a change. Old sprockets 3.8 gearing, new is 3.9. Of course I am with you at 4.2.

Get a ride on one. They have lots of power compared to the old Sherco`s. They turn ok, but I think they feel cramped. Like you are to far forward. But everyone is different on likes/dislikes.

Chances are the friction plates have come apart. Only thing to do is pull the clutch apart and see. Just lay the bike over on the left side, pop off the round clutch cover which has an oring. Take the 6 bolts and springs out and remove the plates. Good chance the friction material has separated from the steel.

Kick start sleeve and stop bolt would be my first place to look. Go to Beta USA support page and look at the parts diagram for the starter.

Depends on the years, but 300cc was the norm.

That is strange. Almost seemd he is running too small of tube.

You can buy a tube type tire. You could buy a tubeless rim. Or you could just screw the tire to the rim. ( The old tried and true method of us old cheap B`s.)