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After spending the last year trying to dial in my motor, I gave up and decided to tear it down and rebuild it. It has three problems:

1 Kickstarter locks about every other kick.
2 Clutch shaft leaks
3 And now, my head (below):
Forum member supplied image with no explanatory text
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UTC quote
I want to go with a paper gasket and replace that dumb o-ring. At first I was thinking of filling in the groove and broken part with JB weld, but I thought that it might not stand up to the heat/cooling cycle.

So now I'm thinking to just repair the cracked piece with JB weld and fill in the groove with some fuel-tolerant gasket sealer.

I don't know yet.
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UTC quote
I think you'll still be chasing your ass on a repair with that head.

I'd plunk down the coin for a new one and cross that shit right off my list and not look back.
@chandlerman avatar
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UTC quote
greasy125 wrote:
I think you'll still be chasing your ass on a repair with that head.

I'd plunk down the coin for a new one and cross that shit right off my list and not look back.
Agreed.

Also, wtf happened to that stud hole? It looks like it got drilled twice at some point, which makes me wonder what else is going on from a Bad Touch perspective with your motor.
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UTC quote
chandlerman wrote:
Also, wtf happened to that stud hole?

Dude, I don't know. This was supposedly rebuilt by some Vespa performance guru but, as usual, if you want something done right . . .

I buy old cars (and Vespas) and sellers seem to fall into three categories:

1. The cheap rat who doesn't want to spend what's needed to do it right.

2. The dude who does everything half-assed but thinks it's good enough and will hold up.

3. The guy who just doesn't know what tf he's doing.

I think my dude is a combo of 2 & 3. Very disappointing as this was sold to me as "just rebuilt", "like new", etc., etc. Bought it here too.

Finally, I'd love to buy a new head but so far I can't find one.
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UTC quote
chandlerman wrote:
Agreed.

This is a SS180. Would a P200 head work? They look awfully close. Different part #s though.
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UTC quote
Until you replace that head, you're never going to run right. Did you put it through a parts cleaner to get it so clean?

Check the kickstart quadrant isn't bent if it locks up. If it's not, when you open the cases, make sure the rubber buffers aren't out of place. If one of them is, it can jam things up from time to time.

And, yeah, the average scooterist is cheap af and has no idea what they're doing mechanically.
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UTC quote
The head you have is a modified P200 head.

the stud placement of the SS180 and P200 are not the same, that's why one of the holes on yours is modified to be peanut shape.
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UTC quote
chandlerman wrote:
Until you replace that head, you're never going to run right. Did you put it through a parts cleaner to get it so clean?

Ha, the dishwasher.
chandlerman wrote:
Check the kickstart quadrant isn't bent if it locks up. If it's not, when you open the cases, make sure the rubber buffers aren't out of place. If one of them is, it can jam things up from time to time.

Thanks so much for this. I'm just getting started. I'm sure there's much more to come.
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VNB VSC VMA VSX - o9c vbc vmb
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UTC quote
Man those heads are spendy when they come up. Godspeed.
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UTC quote
Update: Scooterwest just responded and said that "in theory" the VSX head should fit a VSC.
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Lucky
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UTC quote
mr-blazer wrote:
Ha, the dishwasher.
Waaaaaay ahead of you... Razz emoticon

External inline image provided by member with no explanatory text
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UTC quote
mr-blazer wrote:
Update: Scooterwest just responded and said that "in theory" the VSX head should fit a VSC.
Yes.

See OTC's comment above.
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UTC quote
somebody obviously knew what they were doing in that the head is drilled, tapped and profiled, it's just sloppy work-- the bowl doesn't look finished nicely, which wtf? that takes like two seconds when it's chucked up. and the break obviously happened somewhere along the line *before* being assembled, so somebody just slammed it together and said "ship it!".

besides modifying a P200 head, is there another that works or could be made to work? GS maybe?
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UTC quote
and if going to all that work then may as well recess it into the bore to locate it and tighten up the squish.
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UTC quote
Back on the bench. At least it looks good, even if it doesn't run.
Forum member supplied image with no explanatory text
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UTC quote
oopsclunkthud wrote:
and if going to all that work then may as well recess it into the bore to locate it and tighten up the squish.
Do you have a fixture to hold a head level or a process to recess with an offset sparkplug? I was looking into that on a P200 head, however it was cost prohibitive with setup etc. Ended up purchasing a center mount spark plug so I could chuck it up in a lathe using a piston stop.
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UTC quote
Clean looking SS!!! Is that a vespatronic ignition?
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Yes it is.
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UTC quote
Christopher_55934 wrote:
Do you have a fixture to hold a head level or a process to recess with an offset sparkplug? I was looking into that on a P200 head, however it was cost prohibitive with setup etc. Ended up purchasing a center mount spark plug so I could chuck it up in a lathe using a piston stop.
I'll be building a jig like this as soon as my lathe is up and running.

Cylinder Stud Patterns (Post 2306188)
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UTC quote
oopsclunkthud wrote:
I'll be building a jig like this as soon as my lathe is up and running.

Cylinder Stud Patterns (Post 2306188)
That's the type of fixture I had in mind, never worked through what needed to be done for leveling, locating etc.
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general procedure is to:

1. clamp the head face down on a mill and spot face each of the stud bosses.
2. the fixture then holds the head by the stud bosses to present the face for any reprofiling.
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UTC quote
Quote:
Kickstarter locks about every other kick
Replace the Xmas tree and/or the small kickstart gear.
Quote:
Clutch shaft leaks
There's an O-ring at the the clutch actuator arm where it goes into the clutch lid.


You can see here how it's installed in its groove.



External inline image provided by member with no explanatory text[/quote]
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Thanks so much for this. I'm not there yet but, believe me, I am taking everything in.
⬆️    About 1 month elapsed    ⬇️
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UTC quote
chandlerman wrote:
which makes me wonder what else is going on from a Bad Touch perspective with your motor.
The clutch arm was bent and was binding. It's not totally clear from the pic, but it's not seating true so the o ring isn't seating symmetrically.
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Clutch cover is now rebuilt and installed.

So, noob question: Should I be able to actuate the clutch by pulling on the clutch arm?

When the clutch cover was off, the arm worked fine. But installed, it feels like the clutch is locked up - I can't compress it.
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you would need about a 6" lever arm added to be able to move it by hand
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Lucky
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UTC quote
oopsclunkthud wrote:
you would need about a 6" lever arm added to be able to move it by hand
This.

Clamp a pair of vice grips on the lever and you should be able to move it and feel it (dis)engaging.
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UTC quote
Ok, sorry for neglecting this thread but everything went together smoothly and my issues appear to be solved. Here are a couple of in process pix:

New head - a VSX head. Weirdly (or not), the combustion chamber was actually the worst finished part of the head. I hand polished it but I wasn't gonna get everything, so this is what I wound up with:
Forum member supplied image with no explanatory text
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Ok, so this pig runs. No vid so you're just gonna have to take my word for it. Now to get it off the stand and adjust everything. Don't know if this is the easy part or the hard part. Thanks to everybody for their tips.
Forum member supplied image with no explanatory text
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Lucky
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UTC quote
mr-blazer wrote:
Ok, so this pig runs. No vid so you're just gonna have to take my word for it. Now to get it off the stand and adjust everything. Don't know if this is the easy part or the hard part. Thanks to everybody for their tips.
Glad to hear it!

What's the story with that airbox setup? I've never seen that before, but it looks interesting.
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UTC quote
It's stock. It just needed that rubber bellows thingie installed. I didn't do it yet because I would just have to take it all apart again if I have to re-jet it.
Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text
@subetherbass avatar
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1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
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Ossessionato
@subetherbass avatar
1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
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UTC quote
chandlerman wrote:
Glad to hear it!

What's the story with that airbox setup? I've never seen that before, but it looks interesting.
It's a SS180 airbox setup
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UTC quote
SubEtherBASS wrote:
It's a SS180 airbox setup
On an SS180, of all things!
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UTC quote
Ok, I thought I would post a little cheesecake to wrap this up. I think I'm pretty close with jetting with:

Idle: 55/100
Tube: BE2
AC: 150
Main: 135

My plug B8ES is still pretty black so I may try a B7ES.
Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text
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