Modern Vespa

Wow! Good find. Sucks, but good find!

Three hours after pumping it up to 6psi today it was still just over 4psi.

I reckon that'll do.

Your pressure testing is legendary. I just wait 10 minutes. Need to up my game.
I would like to say its hard to believe that Malossi reed block but it just isn't. A lot of parts now are a bit rough.

Remarkable find really.
Ur motors are air tight enough to float with helium.
Curious tho - the hole appeared to be round - as if bored.
What do u make of the almost perfect circle ?
Did that just punch out?

Thats Nasty Craig..i hope mines ok, been running for over a year now so time will tell

Yep - dissapointed in the roughness of that. SIP have offered to ship a replacement, fair play to them. U.A.T. has been part of my working life for long enough that I cant divorce myself from it, so it's nice when the result works. All I did was press on it with a scribe when it was under about 5-6psi of pressure. The wall was only about .2mm thin at that point, so no surprise it blew. The pretty circle was interesting, the jagged bits were pointing in not out, not sure why. Nice shot Jim. Mine's got reed cases, so it's a canyon in comparison. I'll try to get a shot. Am thinking about putting a fuel pump on, so might take the vac off the side wall of the block.

She's up and running, but not rideable yet - gear selection needs work.

Think I'm gonna need some help from the brains trust here.

I put a px lusso driveset in on the latest rebuild. Since then I've been really struggling to select gears.

I've tried my liztor selector, then a used and crusty PX style one out of a box in the garage, then a shiny new one.

Tonight the shiny new one went on. Was stiff at first, but it shifted, and went into all gears. I put some greaseon it and went for a spin.

It was good at first - selected all gears and went up and down. I started to feel good about it and found some gaps in traffic to get it on the pipe. All good and wickedly fun.

Next I headed to the freeway. Just after dark and pretty busy, but I got it into a gap, pushed it through the gears on the pipe, and was happily winding past 100 klicks when I could get a gap. then I jumped off the freeway, looped back on, and headed back into town (less traffic that way)

Heading down the on ramp, I switch into "like you stole it" mode, and wanted to hit 4th really on the pipe. Clutch in, twist to 4th, nope. Massive resistance. Hmm, now I'm joing the freeway coasting on the clutch, rather than accellerating into my gap. Nasty. Rev, hold 3rd, jump off at the off ramp.

From there on, all the way home,I only had 1st and second, and occasionally, if I twisted like I was going to break the cable, 3rd.

I checked the cables, nothings caught, I loosened them slightly in case they were too tight, and I adjusted the clutch up and down.

Weird. 1, neutral 2 and sometimes 3.

Any thoughts on what I might have done?

Shooting from the hip...

Did the cruciform back off the threads a smidge?
Checked the tiny tapered pin that's located in the selector box arm?
Lusso driveset is EFL, correct? Could it be possible that you accidentally installed pre and post Lusso gears on the same stack?
Newer selector boxes aren't the best of quality. Maybe that could be a problem as well?
Some foreign object fell into your headset, causing the shift handle to not rotate forwards?
Frayed gear selector cable causing a fiction point somewhere in your cable?
The pinch bolts at the selector box are too tall, and are fouling out against the selector box cover?

Well - I fall well short of brain trust - actually - I think I fail on both counts - but first thought is this:

https://scooterlab.uk/vespa-px-gear-selector-boxes-part-1-workshop/

These guys did a whole write up about it with some pretty detailed pics you can confirm with Check vs V shapes and subtle height change - which might be interfering as it goes above deck in 3rd gear - where you are having some weirdness.

JBWeld repairs aren't temporary. Just sayin' D

Life has been a little busy.

Went out and figured it out today.

I'd already played with the selector box. And the cables. And the clutch. And the selector rod. And boroscoped the cruciform. Nada.

I took the selector box off the cables completely, and the problem remained. Must be headset or cables.

So I pulled out the headlight and speedo, and I looked hard in the headset. The cables ran free, but the selctor disk could concieveably foul on the inner edge of the headset (it's a px style disk in a Super headset). So I dremelled it. No good.

I then thought I had it - the new disk has a new clip, maybe it's sticking. So I trimmed the excess of the ends. Better, but still sticking. Then I had a bloody good look at the tube itself.

There was a big fracture, and a twist in the tube, and it was fouling on the clutch cable.. Getting it out was a chore.
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Problem solved. New tube ordered.

eegads! at least you found it!

And cable outer I hope!

160/BE3/118 main

Does the '160' refer to the air corrector?

Yes it does.