Black Spark Plug
Hi, after my tea time run of about 60 or 70 miles the spark plug is really sooty, can anybody tell me how to cure it please...?
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bristolmod
- registered user
- Posts: 1741
- Joined: Wed Jan 07, 2009 8:42 am
- Main scooter: Lambretta TV175 S3- what else!
- Location: Bali-Hai bar, Locarno Ballroom Bristol, 1967!- mines a Brown Split!!
- Contact:
Clean it? 
I think you may need to tell us your set up first...............
I think you may need to tell us your set up first...............
Scootering since 1968.
GP200 with 22mm Jetex carb
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bristolmod
- registered user
- Posts: 1741
- Joined: Wed Jan 07, 2009 8:42 am
- Main scooter: Lambretta TV175 S3- what else!
- Location: Bali-Hai bar, Locarno Ballroom Bristol, 1967!- mines a Brown Split!!
- Contact:
Jetex could be the problem- poorly machined?
Main jet to large? Try 118
Jets/ atomisers/ slide. Wrong sizes / poorly made?
Wrong spark plug?
Blocked air filter?
Is bike running OK apart from black plug?
Main jet to large? Try 118
Jets/ atomisers/ slide. Wrong sizes / poorly made?
Wrong spark plug?
Blocked air filter?
Is bike running OK apart from black plug?
Scootering since 1968.
Main jet is 118
spark plug Champion N5C for hot running
air filter looks a bit iffy
but apart from that it runs quite well
spark plug Champion N5C for hot running
air filter looks a bit iffy
but apart from that it runs quite well
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bristolmod
- registered user
- Posts: 1741
- Joined: Wed Jan 07, 2009 8:42 am
- Main scooter: Lambretta TV175 S3- what else!
- Location: Bali-Hai bar, Locarno Ballroom Bristol, 1967!- mines a Brown Split!!
- Contact:
try an N4 or a genuine NGK B7ES
Scootering since 1968.