p200e 1979
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Member
1979 P200e
Joined: 06 Jun 2019
Posts: 12
Location: Baytown, TX
Thu Dec 26, 2019 7:40 pm quote
So I have a 1979 p200e. It had piston slap so I ordered a barrel and piston, took it apart, but had some troubles getting one of the snap rings out, ran out of time and let it sit for about 3 months until Christmas Break.I got it all back together, compression is great, but now I have zero spark. The kill switch assembly was off when I first got the bike but the key worked. Can the coil/cdi go back from sitting like that? All of the wires are still hooked up. Any ideas?
Member
P200e
Joined: 29 Jul 2018
Posts: 45
Location: Orange , Ca
Thu Dec 26, 2019 7:48 pm quote
Check that the spark plug cap was possibly pulled out of The ignition cable . Also pull the switch out of the headset to be sure the kill wire isn't grounded out . I have also seen the inside of the flywheel get rust and block the electrical connection .
Member
1979 P200e
Joined: 06 Jun 2019
Posts: 12
Location: Baytown, TX
Fri Dec 27, 2019 9:12 am quote
Will check that now. It was inside my house the whole time it was down so nothing should have rusted. When I turn the key the tail light comes on but I will open it up. I pulled the outside green wire off which I think is the kill and nothing changed(also put that one back and pulled the inside green)
Member
P200e
Joined: 29 Jul 2018
Posts: 45
Location: Orange , Ca
Fri Dec 27, 2019 9:36 am quote
As you know its just a process of elimination right ? When this happens to me i start with what could have possibly changed since it worked last . Did I accidentally do this or that . Its always unintentional but has a negative effect right ? Pinching a wire while putting the switch in or putting thr headset top on .yanking on the spark plug cap doing something else . Since it was inside your probably right it shouldn’t have any rust ,but it only takes 5 minutes to rule it out . Its something silly and im sure you’ll find it just be patient and methodical .
Ossessionato
73 Rally, 74 Rally, 76 ET3, 80 P200, 06 PX150, 65 Li225 Silver Special, 86,95,96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3406
Location: Oceanside/ SF
Fri Dec 27, 2019 11:15 am quote
Yep, like VSX said process of elimination.

-Youve eliminated the harness kill wire by disconnecting the outer green wire.
-Then the CDI to spark plug cap wire. Make sure those connections are secure.
-Have you tried a new spark plug?
- After that I'd focus on the electronic components. Do you have a multimeter? Check the resistance on the green, red, and white wires that go to the CDI. The values should be close to these:
G- 495 ohms
Red to CDI-128
W-00.2
- If those are close then I'd focus on the flywheel woodruff key. Did you torque the flywheel down to spec 45 ft/ lbs when you rebuilt it?
-Last i'd check if the flywheel has enough magnetism? Get a 17mm open ended wrench and put it to each magnet in the flywheel. It should hold the wrench in the air no problem.
Member
1979 P200e
Joined: 06 Jun 2019
Posts: 12
Location: Baytown, TX
Fri Dec 27, 2019 1:27 pm quote
I have checked the coil for an inserted ignition wire. It is good. I also tried a brand new plug(first thing I did actually).

Thank you for the readings to check. I do have a meter and I'll check tomorrow morning. We are headed the Texas Bowl shortly. I did not take the flywheel off to change the piston and jug. I just pulled the rear wheel, exhaust, and plastic cover.

I've been worried about the flywheel. I was hoping to have her running before I had to go back to work but if I need to send the flywheel out that wont be happening. I guess scooter west is normally pretty fast though.

I guess this will give me a chance to fix the kill switch being disconnected. I'll trace out the wire and see where its supposed to go.

Last edited by jjona5 on Fri Dec 27, 2019 1:37 pm; edited 1 time in total
Member
1979 P200e
Joined: 06 Jun 2019
Posts: 12
Location: Baytown, TX
Fri Dec 27, 2019 1:36 pm quote
stator
Might also be a good time to upgrade the stator/charging system. I have been unhappy with it since I bought the bike
Member
1979 P200e
Joined: 06 Jun 2019
Posts: 12
Location: Baytown, TX
Fri Dec 27, 2019 1:46 pm quote


Am I supposed to have those centering bushings like this in the picture? My vespa did not have them and the kit didn't come with them either.

Last edited by jjona5 on Fri Dec 27, 2019 10:40 pm; edited 1 time in total
Ossessionato
1979 P200e
Joined: 18 Mar 2013
Posts: 2536
Location: Lock Haven, PA
Fri Dec 27, 2019 2:16 pm quote
Where did you disconnect the green wire? Take it off at the cdi to ensure it's not grounding somewhere on its journey to the kill switch.
Banned
Joined: 04 Jul 2019
Posts: 55

Fri Dec 27, 2019 8:13 pm quote
P200's are notorious for the vinyl falling off the kill wire and grounding to the body somewhere.
Member
1979 P200e
Joined: 06 Jun 2019
Posts: 12
Location: Baytown, TX
Fri Dec 27, 2019 10:41 pm quote
Larrytsg wrote:
Where did you disconnect the green wire? Take it off at the cdi to ensure it's not grounding somewhere on its journey to the kill switch.
I disconnected it from the CDI. I wasn't sure if it was the outter or second from outer so I tried both. Either way no spark.
Ossessionato
1979 P200e
Joined: 18 Mar 2013
Posts: 2536
Location: Lock Haven, PA
Sat Dec 28, 2019 4:34 am quote
I haven't seen my scoot since I moved in August, but I recall it is the outer wire on the cdi,

Mine broke at one point, I had no way of shutting off the scoot but stalling it or shutting off the fuel tap.
Hooked
58 VB1T, 68 SS180, 81 100 Sport
Joined: 06 May 2019
Posts: 278
Location: Long Beach, CA
Sat Dec 28, 2019 9:58 am quote
Crawdad23 wrote:
P200's are notorious for the vinyl falling off the kill wire and grounding to the body somewhere.
So very true. Most of us P200 owners (my first vespa) can testify to the fact that the green wire insulation on these bikes is designed to self destruct. I belived they start cracking and deteriorating before they left the factory floor.

The outer green wire on the CDI would be your kill wire. If you disconnect this and still no spark, it could be a bad CDI or the Stator wiring need to be replaced.

CDI ignition can be hard to diagnose. If you can replace the CDI box with a known good one, try that. Then also inspect the wiring from stator to CDI/harness, as the insulation can crack and ground out here. Remove flywheel to get a better look. Might just be coincidence with the timing of these problems....
Ossessionato
Joined: 26 Oct 2015
Posts: 2079

Sat Dec 28, 2019 10:12 am quote
jjona5 wrote:


Am I supposed to have those centering bushings like this in the picture? My vespa did not have them and the kit didn't come with them either.
I’m not aware of any kit that comes with those centering bushes included. I bought them separately from SIP to use on my T5 172 to locate my MMW head.
Hooked
Jet 200, P200E (x2), T5
Joined: 27 Jan 2013
Posts: 351
Location: Paris, France & L.A., Cal, USA
Sun Dec 29, 2019 5:38 pm quote
Larrytsg wrote:
I haven't seen my scoot since I moved in August, but I recall it is the outer wire on the cdi,
Actually, both green wires at the CDI are interchangeable (so if the previous owner switched them, you might be unplugging the wrong one), but the one you want to make sure is plugged in is the one that comes from the stator (along with the red and white).
Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1247
Location: UK (South East)
Sun Dec 29, 2019 11:34 pm quote
The picture is of a Malossi 221 (or 210) kit. These come with the bushes to center the head and two of the stud holes in the cylinder are slightly bigger to accommodate the bushes. You didn't say which cylinder and piston you bought, but most would not have either the bushes or the machining.
Member
1979 P200e
Joined: 06 Jun 2019
Posts: 12
Location: Baytown, TX
Wed Jan 08, 2020 4:28 pm quote
I put in a stock Piaggio p200 piston/barrel set. BTW all my tools came in along with the ducati cdi. Installed the cdi and spun it over and saw fire on the plug. Installed the plug and it fired first kick. SWEET.
Member
1979 P200e
Joined: 06 Jun 2019
Posts: 12
Location: Baytown, TX
Thu Feb 06, 2020 9:08 pm quote
Forgot to come back and reply it was the cdi. Replace it and it fired up first kick. That said I got the jetting dialed in, was flying around the neighborhood and it died. All he rivets popped on the flywheel so no more timing or spark...
Member
1979 P200e
Joined: 06 Jun 2019
Posts: 12
Location: Baytown, TX
Sat Feb 08, 2020 7:03 pm quote
New flywheel and adjusted timing and she is flying now. No issues. Also I had a slight knock sound which was apparently that flywheel with bad rivets.
Addicted
GL, PK, PE200 with hack, Sears Rust Badge
Joined: 24 Apr 2012
Posts: 789
Location: Deep in the heart of Texas
Sat Feb 08, 2020 7:12 pm quote
jjona5 wrote:
New flywheel and adjusted timing and she is flying now. No issues. Also I had a slight knock sound which was apparently that flywheel with bad rivets.
Did the piston slap noise, mentioned in the 1st post, stop with the new top end? Was the piston slap actually the knock sound from the flywheel or was this 2 different issues?
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