feetupfun

Very hard to diagnose over the internet using words. Can you post a video on youtube of it misbehaving?

Don't worry chappo I got the 348 out again today and have now fitted the plug to the central spark plug hole and it all fits fine. The other night when I looked at it I didn't twig at the time that you can very easily access the plug with the tank tilted up

Maybe there were more than one 348 exhaust pipe design. With mine it would be extremely hard, maybe impossible to get the cap off if the plug was in the central hole and it was a standard height plug. I see in the brochure photo, the plug is in the central hole but also in the brochure photo showing the left side of the bike, the exhaust looks different to mine where it goes over the head, maybe a smaller diameter pipe. I'll have a better look at mine on the weekend and try and work out if it is different to the pipe in the brochure photo.

I just had a look at mine. If you can remove and refit a spark plug cap on the plug when it is in the central hole with the exhaust in place, I'll be very impressed

Does it all still fit nicely with the exhaust pipe in place?

Yes they normally use a barrel that fits in the end of the brake arm and a nut on the adjuster thread. What advice do you want? I could do a photo of mine if it will help

Like this one?

Don't throw away the standard fork yokes. You may decide to revert to them after trying alternatives.

Have you got a photo of what you are after? I'm a bit lost by the description

One 348 I bought in about 2000 still had visible cross-hatching on the fork tube chrome and in the cylinder bore and it still had the original sprockets, handlebars, levers, cables etc. It had been ridden in trials but very little. I have a suspicion that some people bought them new and found that they were not as easy to ride as they had thought and just parked them up

Yes you can normally operate a clutch actuation arm like the one on your bike with a suitable tool to increase the leverage but you might have to make something due to the space being a bit tight on that motor. I have previously operated a clutch arm on other bikes using an 12" shifting spanner to provide the leverage. It's a very common thing on those motors to bend and sometimes crack that arm next to the weld

What ignition system? What plug gap? What fuel? What premix oil? What does the spark look like? Are there any whiskers on the used plugs? Did the fuel type get changed recently?

Corroded yokes is a common thing with 348s but there are usually some being broken down for parts in the UK. Be aware that the yokes from a 247 look very similar and will fit, but have slightly different geometry. Both 247 and 348 yokes were made from rolled aluminium plate which lends them to that sort of failure. I saw some NOS 348 yokes advertised a while back in the US. Sorry not allowed to mention suppliers on here. As for water getting inside things, one of my 348s came with collapsed forks and I found they were full of water. Lots of corrosion on the insides of the tubes.

That sure looks great. I'm intrigued with the black shields/guards inboard of the footpegs

Wow we had one of those CZ scooters too! I also remember our CZ scooter was 12v electrics when most bikes were 6V

If you still have doubt, why not just check out someone else's trials bike

Yes it is a floating disc

My wife chose her trials bike (Beta 200) based on the relative ease of starting it

That video of Albert on the electric Gasser didn't excite me. The visuals are nice but if the bike could be made to sound interesting it could be appealing. I don't know why but the Yamaha e-bike had a more interesting sound

They are a fabulous reliable and well-made bike with very few weak points but here is what I know: The bashplate is not flat underneath so the bike leans over if rested on a horizontal log (only important to learners) "relatively" heavy (compared with a 200 Beta). Very light compared with a twinshock. More flywheel effect would assist the 143cc motor for novices. The clutch engagement is "relatively" sudden but can be fixed with mods. The gearbox is TTR125 so second gear is further from first than on a dedicated trials motor.

There you go - original folding tip pedals and original crappy footpegs

I think some of us need to post some photos of our original 348s with folding pedal tips

8000 feet ? get ready for a big drop in power. Even 3000 feet which is as high as I go makes a difference to the power. Yes bikes usually benefit from being re-jetted for riding at high altitude. Without knowing how yours is jetted though it is hard to suggest how much to change it for this weekend. I used to go about 3 sizes smaller on the main jet for 3000 feet on a standard TY175 and didn't need to change anything else. Turning the air screw out makes it leaner at idle. Dropping the needle makes it leaner between 1/4 and 3/4 throttle.

I haven't tried vinylester so can't comment

That's why I line my tanks with epoxy resin