backfire/ overrun causes?
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- registered user
- Posts: 59
- Joined: Fri Jul 05, 2013 7:19 pm
- Main scooter: SX150/ Mugello 186
- Contact:
thoughts on what might be causing my engine to occasionally backfire through the exhaust? it only seems to happen when i have been running at full throttle, backed off & then re-open the throttle. There will be a split second hesitation followed by a flat sounding explosive/ woosh noise from the exhaust which you can feel popping out of the end of the pipe. It doesn't happen all the time, only under extended full load running. the plug colour is good, otherwise it runs fine. set up is a Pinasco 177 kit on a P125 with a 24mm carb, fast flow tap & SIP Road 2. Jets are 160-BE3-118. Nothing has been changed recently to this setup.
- garry inglis
- registered user
- Posts: 1298
- Joined: Tue Jul 21, 2015 8:04 pm
- Main scooter: ts1 230 and rb200
- Location: darlington
- Contact:
Backfire is nearly always electrical probably stator
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The only time I experienced backfiring (apart from after a curry) was when the CDi was on the way out.
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- registered user
- Posts: 25
- Joined: Sun May 13, 2012 11:01 pm
- Main scooter: LI150 Special
- Location: Hatfield
- Contact:
Check plug cap for good fit and ht connection to CDI.
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