Indian PX stators, unable to time.

[lambro]

Having a headscratch moment, and after strobing a good few Vespa's in the last few years, I have a couple doing my nut in.
This one is odd, most likely something simple, but I can't see it for the 'Pistoff'nfuctoff' I am suffering from at the moment.

Story is, PX125, 166 Malossi.
Piston stop method and two stops marked off.
Flywheel off, cutdown timing disc to clear stator used, TDC mark found and stop marks are 41 degrees either side.
I took TDC and marked 16btdc.
Stator on full advance just past IT.
Flywheel on fired up and strobing at about 36btdc
Elongated holes and restrobed, nigh on no difference.
Changed CDI for an old Ducati, still same.
Elongated holes a bit more, better.
Changed flywheel for a known good one, checked woodruff slot and crossed magnets against the other flywheel and all still the same.
Elongated holes a bit more and a bit better.
Changed stator for a working one I have previously strobed at 16 on another engine, and that also fully advanced is strobing at about 36btdc
Checked TDc with a screwdriver and a tad amiis (not alot),
Checked TDC with a borescope watching for the rock and it matched my piston stop TDC.
Don't have a dial guage, but I am not going to be wrong on 3 other methods.
So, 2 flywheels (Piaggio), 2 stators (Indian), 2 CDI's, (1 unknown make, 1 Ducati).
Oh, and 2 timing lights, my Draper one, and my mates Snap on one, still the same.

Now, If I keep elongating (I am almost double the normal slot and nowhere near) I will be able to get it to strobe right, but that can't be right, can it

Any ideas????

I do have an umolested PX rotting in the back garden (future project), I may borrow that stator as it will be Italian.
Whats reckon chaps??

[B-Race Tuning]

Eh Oh, you say Malossi 166. Is it a new build? Has it run before? With the same crank? Simon.

[lambro]

Hi Simon.
Scoot a mate has picked up.
Has run, but not on the road with him or previous owner.
New top end as the old DR on it was a rattler.
Runs, but splutters and wont pull, thought carb, but wanted to strobe first to check.
Same crank it came with as a non runner.

[Yanker]

Having a headscratch moment, and after strobing a good few Vespa's in the last few years, I have a couple doing my nut in.
This one is odd, most likely something simple, but I can't see it for the 'Pistoff'nfuctoff' I am suffering from at the moment.

Story is, PX125, 166 Malossi.
Piston stop method and two stops marked off.
Flywheel off, cutdown timing disc to clear stator used, TDC mark found and stop marks are 41 degrees either side.
I took TDC and marked 16btdc.
Stator on full advance just past IT.
Flywheel on fired up and strobing at about 36btdc
Elongated holes and restrobed, nigh on no difference.
Changed CDI for an old Ducati, still same.
Elongated holes a bit more, better.
Changed flywheel for a known good one, checked woodruff slot and crossed magnets against the other flywheel and all still the same.
Elongated holes a bit more and a bit better.
Changed stator for a working one I have previously strobed at 16 on another engine, and that also fully advanced is strobing at about 36btdc
Checked TDc with a screwdriver and a tad amiis (not alot),
Checked TDC with a borescope watching for the rock and it matched my piston stop TDC.
Don't have a dial guage, but I am not going to be wrong on 3 other methods.
So, 2 flywheels (Piaggio), 2 stators (Indian), 2 CDI's, (1 unknown make, 1 Ducati).
Oh, and 2 timing lights, my Draper one, and my mates Snap on one, still the same.

Now, If I keep elongating (I am almost double the normal slot and nowhere near) I will be able to get it to strobe right, but that can't be right, can it

Any ideas????

I do have an umolested PX rotting in the back garden (future project), I may borrow that stator as it will be Italian.
Whats reckon chaps??

The woodruff Key slot on the flywheel is incorrectly located vs the stator? There were a few prodution years (1976-1983 at outside perameters) where Piaggio transgressed from points to electronic ignition on the 125/150 models. Is it possible that you have the earlier crank with tha later flywheel? However if the stators are Indian then I think you might be on to a winner.....I mean loser there......

[rosscla]

Just so I'm clear Yanker, are you saying that the position of the key ways is different in relation to the TDC? The inference being that there are points and electronic CRANKS??

[OzOAP]

My Snap-on timing light is for 4 stroke. So on a 2t the timing figures have to be halved.
Is your 36 deg actually 18, and all your marks are right?
I would go 16 deg on a 166, that is normally fully clockwise on std stator.

[lambro]

The crank is a points one, but so is the flywheel.
Its the one one with a cam and the electronic pick up.
The other flywheel is a straight electronic one.
I always thought the points and electronic were the same, hence the crossover flywheels.
Oz, I agree on the timing light, but my Draper one has always been good on 2 strokes, and I have done a couple now.
Snap on one was just to double check, I will try another basic one and have a look.
Sorry I didn't see you at Weston, I never even got into town over the whole weekend,
Spent the whole weekend tiling and bathroom fitting
Made a change from chatting bollox and drinking though

I have shoved the offending scooter in the naughty corner for a couple of days and will look again next week.

[lambro]

Turns out both the flywheels I was trying were the points/electronic swap over ones.



Tipex marks are woodruff and pickup magnets.



Tipex marks on these two show the difference between an electric start flywheel and the crossover ones I have.

Turns out that although my flywheels have electronic crossed magnets they are not suitable

Must pay more attention next time