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Rubber Side Down!
› fowled plug and black smoke
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fowled plug and black smoke (Read 7 times)
barry68v10
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Re: fowled plug and black smoke
Reply #15 -
09/30/07 at 04:25:03
I tend to agree with WD. 155 main seems extreme when you consider the stock is 145. Going up 4 sizes in jets might be ok, but you'd want to get there 1 at a time. I've got the stock pilot and main, and simply got rid of the white spacer, and my mpg dropped from mid 70's to high 50's (got 58 last tank.) That's a pretty big drop, but my throttle response is soooo much better, that it's worth it to me.
"Ideal" air to fuel mixture is around 14.6:1, but an engine will "run" from about 11:1 on the "crazy rich side" all the way up to 18:1 on the "make your nose bleed lean side." You're definitely better off at 15 or 16:1 than 12 or 13:1, so I'd err in that direction if at all. My personal preference is 14:1 for "hot rod" applications, and 15:1 for "daily drivers." I don't have my exel spreadsheet out right now, but I think a stock S-40 runs around 15 or 16:1. Can anybody confirm or deny?
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petc0ck mod, white spacer removed, 150 main jet, 12.5" shocks, 16" turnout muff, oil cooler mod, chain conversion, Tkat brace, external fuel filter, fuel screen removed...
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Savage_Rob
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Re: fowled plug and black smoke
Reply #16 -
10/01/07 at 06:49:16
When I had the stock carb on mine, along with a MAC muffler and K&N air filter, a #55 pilot and #152.5 main worked perfectly for me. Many folks don't need the #55 pilot though.
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1998|MAC muffler|ceramic coated header|K&N air filter|Amal Mk2 carb|Odyssey battery|iridium plug|NC windshield|Dunlop 491s|Superbrace|EBC brake rotor|12.5" Progressive shocks|Kuryakyn ISO grips
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barry68v10
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Re: fowled plug and black smoke
Reply #17 -
10/02/07 at 04:34:26
Rob did you notice the ceramic headers required a richer mixture? I noticed when I wrapped my header with heat tape the bike acted like it was running leaner...
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petc0ck mod, white spacer removed, 150 main jet, 12.5" shocks, 16" turnout muff, oil cooler mod, chain conversion, Tkat brace, external fuel filter, fuel screen removed...
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Savage_Rob
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Re: fowled plug and black smoke
Reply #18 -
10/02/07 at 04:58:33
barry68v10 wrote
on 12/31/69 at 16:00:10:
Rob did you notice the ceramic headers required a richer mixture? I noticed when I wrapped my header with heat tape the bike acted like it was running leaner...
Odd hijacking of topic but nope, didn't notice that at all.
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1998|MAC muffler|ceramic coated header|K&N air filter|Amal Mk2 carb|Odyssey battery|iridium plug|NC windshield|Dunlop 491s|Superbrace|EBC brake rotor|12.5" Progressive shocks|Kuryakyn ISO grips
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barry68v10
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Re: fowled plug and black smoke
Reply #19 -
10/02/07 at 14:19:35
Not trying to hijack, trying to provide quick alternatives to test a leaner mixture since I thought we were pretty convinced we're dealing with an over-rich condition...
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petc0ck mod, white spacer removed, 150 main jet, 12.5" shocks, 16" turnout muff, oil cooler mod, chain conversion, Tkat brace, external fuel filter, fuel screen removed...
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splash07
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Re: fowled plug and black smoke
Reply #20 -
10/02/07 at 17:16:41
got the 152.5 main in today and fired it up, she runs a lot better now. Although i am on the sidelines again for other reasons.
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splash07
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Re: fowled plug and black smoke
Reply #21 -
10/03/07 at 21:32:52
well I ran for a bit today, and it seems that the backfireing is worse. Also it seems to be at max RPM at about .5 to .75 turns out. is this odd.
since the pebble ordeal, i cant help but wonder if it is related. So much work on the bike in so little time it makes me dizzy. I due for a 400+ ride this weekend and I am sure all my questions will find answers on the road.
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