Modern Vespa

Something in experiencing is when I shift into first gear from a stop or 2nd from super low rpm the gear "slams" into place and the bike lurches a little.

What is the adjustment here? I recently replaced Clutch cable. Would it have stretched? Wild this be a gear selector adjustment?

Thanks guys! Here me and a pal on
My helix on a recent ride up the north shore.

If your clutch cable adjustment is too tight then that is a clear example that the clutch is already engaging too early. I would try to losen the cable down below at the engine case belly with the nut barrel adjustor, you want to losen it a little bit and try it.

You haven't touched the gear selector cables right? the gears selector fix is very easy, just put it in neutral , make sure that the shifty handle doesn't move (you can use tape) and just loosen the small cable barrels at the sector box, pull light on the cables to remove any slack and tight the cable barrels the closest to the "U" shape selector groove. I am 200% sure you already done it before.

Nice pic!

That sounds like your clutch is dragging to me - might try readjusting the cable.

However - the gearbox is the most primitive thing and some amount of thunk is normal/unavoidable. Popular wisdom is to shift into first BEFORE coming to a full stop, or shift into first from a stop while rolling forward a little to ease the transition. It shouldn't be a "slam" however, so it sounds like adjustment is warranted

The cable being tight will cause the clutch to engage late, not early (or not at all/slip if too much). Loosening it will cause it to engage earlier (possibly dragging if too much)

^^ I just read your response and I just re-read the OP problem and you are correct. When the clutch is dragging it does what you are saying, I didn't visualized it right.

Lol, no worries! I don't know about you but for me it's been a long week

Lower-end cables stretch, absolutely.
Open the cable adjuster and see what that does.

BTW that Helix is the most insane scooter ever made.
Like the Humvee of scoots!

Had any luck backing out the adjuster?
A lot of the SIP Performance cables (that don't stretch) are out of stock. For good reason I'm guessing.

Yea I Love my helix. It's nice to have a second bike for guests too. I have t adjusted the cables yet. I'm on the farm til Friday.

Also, there are "anti-clunk" springs in the primary, that are prone to breaking.
If adjusting the cable doesn't help, that may be something to consider going forward, among a few other possibilities.
BTW my bike clunks. It's a manageable enough clunk.

So most of my "slam" clunk was due to high idle from running choke on. I replaced my fly side seal and adjusted the clutch cable. Much smoother now.

Just noticed my 1980 P200e suddenly doesn't totally release in 1st gear. Even with the clutch lever pulled it still wants to creep. Shifting from 1st to neutral is also difficult.

I think the transmission oil may be low so I plan to drain and refill. Could low transmission oil cause the first gear issue?

If changing transmission oil doesn't resolve the issue should step two be clutch cable adjustment?

If it still isn't resolved should shifter cable adjustment be step three?

Thanks.

Intermediate discs between clutch plates can be warped. This causes clutch to not disengage completely. Swap for new good ones if the two first steps do not help.

I'd check for clutch cable tension first.

At the clutch lever, you need about a 2mm gap (at the point closest the headlight) from the lever resting position, until you feel spring tension.

Any looser than that you won't be able to engage the gears properly.

If for any reason you can't achieve the 2mm free play, the cable probably needs swapping out or the springs or the plates.

FINYoshi I didn't know this till about a few years ago, but the clutch has 1 wavy plate (it has a notch in it) and it's suppose to help free the plates when the lever is pulled. I was always under the impression they all had to be straight.