Plug look ok?
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Member
PX150
Joined: 11 Jul 2020
Posts: 24
Location: Essex
Thu Jul 30, 2020 4:01 am quote
Hi, does this plug look ok or too rich or too lean?

IMG_20200730_124903_643.jpg

Hooked
GTS 300 ABS, 2018
Joined: 07 Jun 2020
Posts: 147
Location: Finland
Thu Jul 30, 2020 1:13 pm quote
Looks pretty normal 2 stroke plug to me. They are a bit darker because of the burning oil.
Jet Eye Master
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 2226
Location: London UK
Thu Jul 30, 2020 1:59 pm quote
As a general plug it looks rich or too high a number. If this was WOT it's way over.
Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: 12 Sep 2015
Posts: 180
Location: Madtown
Thu Jul 30, 2020 3:19 pm quote
Looks too rich. There should be some tan.
Addicted
BV 350
Joined: 22 Nov 2016
Posts: 637
Location: Nebraska
Fri Jul 31, 2020 10:33 am quote
Maybe
The only way to really read a plug is to run the engine full throttle for several minutes, then shift to neutral, kill the engine, and coast to a stop. Part-throttle and idle confuse the reading.

Unless mileage is a major concern, 2-strokes seem happiest running a bit rich. So long as you are not having problems with the plug fouling, I'd leave this one as is.
Member
PX150
Joined: 11 Jul 2020
Posts: 24
Location: Essex
Fri Jul 31, 2020 10:54 am quote
[quote="kaukari"]
[quote="Jack221"]
[quote="yackee"]
[quote="Jimding"]

Thanks for the replies, great stuff. Yeah the reason I asked about the plug is that the bike starts ok and runs well enough but on open throttle it hits a flat spot and just gurgles. So my three questions to the experts are: what plug ideally should I be using (2000 PX150 engine) and with what main jet? And is it a mixture-screw issue to get rid the flat spot on open throttle?

Thanks again, cheers
Hooked
GTS 300 ABS, 2018
Joined: 07 Jun 2020
Posts: 147
Location: Finland
Sat Aug 01, 2020 3:09 pm quote
Gurgling at fully (only ?) open throttle may result from too big main jet or too rich mixture. Easiest way is to try to adjust the mixture little bit leaner (more air) with the screw.

If this does not help, you need smaller main jet. I`d forget the plug. It has nothing to do with this issue.
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