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Post by scooternub on Nov 29, 2018 16:49:19 GMT -5
Perfect,lean or rich?   |
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Post by 190mech on Nov 29, 2018 18:49:48 GMT -5
Looks a bit lean,insulator should be darker..  |
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Post by eclark5483 on Nov 30, 2018 22:35:48 GMT -5
Agreed. Not horribly lean, could use a bit of tweaking. Might wanna adjust (restrict) the airbox just a bit first and see how it's doing before going through the trouble of pulling the carb and upjetting. Doesn't look off by much.
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Post by harleyracer59 on Dec 1, 2018 4:25:50 GMT -5
I agree with them depending how many miles are on that plug, you might get away with lowering the clip and raising the needle 1 notch. its close but should be a little brown/ tanner than it looks
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jack667
Scoot Enthusiast
Posts: 190
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Post by jack667 on Dec 1, 2018 7:37:44 GMT -5
This seems like a good place to ask a Q about reading plugs
Is it important to check it right after a ride while things are still very warm or is it ok to wait several hours or even a day? I imagine the black spot would persist but is there anything ephemeral about the white color of a lean situation?
Thx!
(and sorry for the mini-hijack)
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Post by harleyracer59 on Dec 1, 2018 13:04:22 GMT -5
you can wait till it cools off. I don't like pulling plugs hot because of expansion through heat. someone once said it was hard on cylinder head threads when everything is hot and tighter than tolerances would be with cold metal. im not sure how true that exactly is either. but it makes some sense to me. so I kinda follow it. I also put anti seize on the threads of new plugs the first time I install them. not every time mind you. just the first time or after a good cleaning that removed all signs it was there.
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Post by 'O'Verse on Dec 1, 2018 14:34:42 GMT -5
What's your operating temps?
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Post by ryan_ott on Dec 1, 2018 15:13:03 GMT -5
According to this you could use 1 step colder plug.  |
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Post by scooternub on Dec 2, 2018 18:16:30 GMT -5
Agreed. Not horribly lean, could use a bit of tweaking. Might wanna adjust (restrict) the airbox just a bit first and see how it's doing before going through the trouble of pulling the carb and upjetting. Doesn't look off by much. I have the intake half covered with duct tape, runs like a champ, haven't seen any decent weather to check main jet. |
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jack667
Scoot Enthusiast
Posts: 190
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Post by jack667 on Jan 13, 2019 11:42:46 GMT -5
another plug question to throw into this thread...
When (if ever) is it ok to re-use a new plug after testing jetting and getting ready to do another test?
I can imagine that it there some burning on the plug, then it should be replaced, since it will still look burnt after the next test. But if it's just a bit white, or a bit wet, then could it be re-used?
I've been playing with my jetting and I can't believe how many iterations I'm going through!!
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Post by aeroxbud on Jan 13, 2019 14:03:27 GMT -5
By using a new plug you get a much better idea of the colour. By using the old plug it could give you a misleading colour. It will also take a longer time running to give accurate results.
I have used a plug for testing more that one. Only after cleaning. But only when I know it's pretty close, and on the rich side.
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