OP
@petere avatar
UTC

Member
1981 P200
Joined: UTC
Posts: 11
Location: Humboldt County, California
 
Member
@petere avatar
1981 P200
Joined: UTC
Posts: 11
Location: Humboldt County, California
UTC quote
This is a weird one. I just installed new seals, cross, and rewired the stator. Put it all together and it fired right up. Road around a little yesterday with no issues. Today, there was some backfiring then missing under load then it died. It will idle but as soon as the clutch cover lever moves, she dies. The tiniest movement of the lever at the clutch cover kills it. Any ideas?
@charlieman22 avatar
UTC

Nedminder
62 VBB1T Round Tail W/ leaner sidecar
Joined: UTC
Posts: 4110
Location: california
 
Nedminder
@charlieman22 avatar
62 VBB1T Round Tail W/ leaner sidecar
Joined: UTC
Posts: 4110
Location: california
UTC quote
I would rule out air leak first.
Did you pressure test when you completed the work?
Soapy water in spray bottle, and pressurize the motor (lots written on how). Spray it over on the clutch side (as well as all over) and look for bubbles.
OP
@petere avatar
UTC

Member
1981 P200
Joined: UTC
Posts: 11
Location: Humboldt County, California
 
Member
@petere avatar
1981 P200
Joined: UTC
Posts: 11
Location: Humboldt County, California
UTC quote
Thanks. I didn’t pressure test it yet. New point of information: It happens when it’s hot, runs great when cold.
@scootermarc69 avatar
UTC

Ossessionato
Joined: UTC
Posts: 2101
Location: Santa Margarita,Ca.
 
Ossessionato
@scootermarc69 avatar
Joined: UTC
Posts: 2101
Location: Santa Margarita,Ca.
UTC quote
What model?
@scootermarc69 avatar
UTC

Ossessionato
Joined: UTC
Posts: 2101
Location: Santa Margarita,Ca.
 
Ossessionato
@scootermarc69 avatar
Joined: UTC
Posts: 2101
Location: Santa Margarita,Ca.
UTC quote
My first step would be to disconnect the green kill wire from the cdi. If this solves it you have a short that grounds out when the clutch cable stiffens under load.
@killo avatar
UTC

Ossessionato
I have a few scooters....
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Posts: 2226
Location: San Antonio, TX
 
Ossessionato
@killo avatar
I have a few scooters....
Joined: UTC
Posts: 2226
Location: San Antonio, TX
UTC quote
I had a brand new seal almost turn inside out when I installed the crank. I didn’t notice it when it happened. It ran fine at first but got worse and worse.
@gt6mk3 avatar
UTC

Hooked
Bodgerific 150 Super, PX200(ish...), US 50 Special in progress
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Posts: 478
Location: Melbourne, Way Downunder
 
Hooked
@gt6mk3 avatar
Bodgerific 150 Super, PX200(ish...), US 50 Special in progress
Joined: UTC
Posts: 478
Location: Melbourne, Way Downunder
UTC quote
scootermarc69 wrote:
My first step would be to disconnect the green kill wire from the cdi. If this solves it you have a short that grounds out when the clutch cable stiffens under load.
This!
UTC

Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
Joined: UTC
Posts: 4609
Location: London UK
 
Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
Joined: UTC
Posts: 4609
Location: London UK
UTC quote
Clutch nut come undone and crank moving?
@sdjohn avatar
UTC

Johnny Two Tone
'15 GTS300, '86 PX125EFL, '66 VBB, '01 ET4
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Posts: 8555
Location: San Diego, CA
 
Johnny Two Tone
@sdjohn avatar
'15 GTS300, '86 PX125EFL, '66 VBB, '01 ET4
Joined: UTC
Posts: 8555
Location: San Diego, CA
UTC quote
I'm with Jack - maybe some lateral movement (even without a loose nut) combined with pickup location for the CDI could be leaving you without a trigger. You may need to shim the pickup.
OP
@petere avatar
UTC

Member
1981 P200
Joined: UTC
Posts: 11
Location: Humboldt County, California
 
Member
@petere avatar
1981 P200
Joined: UTC
Posts: 11
Location: Humboldt County, California
UTC quote
I tried disconnecting the green wire from the kill switch with no effect. A friend had a rebuilt stator on hand to swap for my self-soldered one. In the process of switching them I discovered that the purple wire from the stator to the regulator and the ground from the stator were touching in the junction box. I put them in their proper slots and the problem went away! Why the clutch had any effect on this is still a mystery to me. Thanks for all the suggestions.
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