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camoweasel
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Joined: Sep 14, 2006
Posts: 50
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 Posted: June 15, 2007, 6:01 pm Post subject: B8ES>BP7ES |
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Is there any advantages to switching to a hotter plug? My bike is stock exept for free flowing megaphone mufflers. I just bought new coils, wires, and caps so is it good idea or should I just run what I have now? 1974 TX650A
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1974 Yamaha TX650A |
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xsjohn
Full Member
Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
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| Posted: June 15, 2007, 7:02 pm Post subject: Re: B8ES>BP7ES |
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Autolite 63 is the samce as BP7ES or .......
John
Last edited by xsjohn on January 2, 2008, 9:54 am; edited 3 times in total |
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grizld1
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Joined: Jun 20, 2005
Posts: 594
Location: Carbondale, IL
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| Posted: June 15, 2007, 8:45 pm Post subject: Re: B8ES>BP7ES |
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If you're having trouble with fouling, consider a hotter plug or the same heat range you're running with a projected nose plug. The the tip of the projected nose plug (BP-series) is designed to extend further into the combustion chamber, leading to improved combustion efficiency and a quick rise to cleaning temp., and it's also exposed more directly to the intake stream for better cooling; the bottom-line effect is to extend the heat range of the plug. Your TX650A has the 447 engine, for which the BP7ES is the recommended plug.
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It ain't whatcha got, it's whatcha can get to the ground! |
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jayel
650Rider Supporter
Joined: Apr 16, 2006
Posts: 3417
Location: SE Iowa 1974 TX650A
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| Posted: June 15, 2007, 8:52 pm Post subject: Re: B8ES>BP7ES |
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I run B8ES's in my 74TX but I do mostly highway miles don't seem to to have any fouling problem, the plug color is your best guide, run the coldest plug you can get away with, less overheating, pre-ignition problems
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xsjohn
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Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
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| Posted: June 15, 2007, 9:19 pm Post subject: Re: B8ES>BP7ES |
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My Original Yamaha manual recommends a BP7ES....I suspect the engine designers expected to run rich mixtures to help cool these air cooled engines....
John
Last edited by xsjohn on January 2, 2008, 9:55 am; edited 5 times in total |
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camoweasel
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Joined: Sep 14, 2006
Posts: 50
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| Posted: June 15, 2007, 10:14 pm Post subject: Re: B8ES>BP7ES |
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Well my plugs now are a beautiful shade of brown so I know that the mixture is right. How an you tell when your engine is pinging/detonating? i know that my motor runs pretty hot as it is so a hotter plug may be a negetive so maybe I should try a bp8es?
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xsjohn
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Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
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| Posted: June 15, 2007, 10:19 pm Post subject: Re: B8ES>BP7ES |
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Did you read about a top end cooler... did you miss it....If you try to cool it with fuel which won't work anyway in the summer you can wash the cylinders and get poor gas mileage and still have a blistering hot head and cylinders......Wa...la....Cool the FN thing down.........
John
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camoweasel
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Joined: Sep 14, 2006
Posts: 50
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| Posted: June 16, 2007, 3:11 am Post subject: Re: B8ES>BP7ES |
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well i know it is definitly not running rich because 45-55 mpgs is my average mileage. The bike already has a cooler installed on it by the previous owner. I will try and get a picture to show how it is rigged up.
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xsjohn
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Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
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| Posted: June 16, 2007, 3:38 am Post subject: Re: B8ES>BP7ES |
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Complete system coolers to me on these XS's are useless or maybe marginal for hot weather.....The hot places get the same temp oil as places that don't really need cooling thus heating up the oil needlessly.......For example my lower cases never gets hotter than 170 degrees so the cool 120-140 oil from the top end cooler goes straight to the hottest place the head and cylinders...And actually cools the lower end as it runs down .....Many will argue this but they just don't get it........The earth is flat syndrome...........Take your pick...275 or 300 degree top end or 230-240 degree top end on a hard running summer day...no brainer......
The xs1100 complete oil cooling system is even worse...There is a super tiny pinhole restrictor to the top end so the lower end stays cool while the top end fries.......At least we can send a bunch of oil to our top ends because the lower oil pressure and higher flow alows more oil to the top end through a much larger restrictor........Lucky...Lucky......
John
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xs1961
650Rider Supporter
Joined: Apr 23, 2007
Posts: 1808
Location: uk
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| Posted: June 16, 2007, 10:05 am Post subject: Re: B8ES>BP7ES |
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| I only use B8ES on my 650/750/840, always have,best out of all Ive tried..
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xsjohn
Full Member
Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
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| Posted: June 16, 2007, 12:28 pm Post subject: Re: B8ES>BP7ES |
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Have you tried the 7's in the winter...Mine runs so cool I need the7's.....
...John
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xs1961
650Rider Supporter
Joined: Apr 23, 2007
Posts: 1808
Location: uk
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| Posted: June 16, 2007, 3:22 pm Post subject: Re: B8ES>BP7ES |
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Doesnt get cold here in the winter John...
What are you riding in the winter for at your age... 
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xsjohn
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Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
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| Posted: June 16, 2007, 3:42 pm Post subject: Re: B8ES>BP7ES |
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Why am I riding at all at my age......?
John
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xs1961
650Rider Supporter
Joined: Apr 23, 2007
Posts: 1808
Location: uk
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| Posted: June 16, 2007, 7:44 pm Post subject: Re: B8ES>BP7ES |
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HeHe..same here..wife doesnt understand.. 
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wally
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Joined: Apr 04, 2007
Posts: 538
Location: Sydney Australia
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| Posted: June 16, 2007, 9:00 pm Post subject: Re: B8ES>BP7ES |
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I have just removed my plugs for replacment they are BP6EY
You all say 7EY
Why would mine have 6EY,s in it.
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xsjohn
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Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
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| Posted: June 16, 2007, 9:25 pm Post subject: Re: B8ES>BP7ES |
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Wally....Try BP7ES (ngk)
Or Autolite 63, or 64
John
Last edited by xsjohn on January 2, 2008, 9:57 am; edited 2 times in total |
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camoweasel
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Joined: Sep 14, 2006
Posts: 50
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| Posted: June 17, 2007, 8:53 pm Post subject: Re: B8ES>BP7ES |
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well I made the switch to the BP7ES. So far after 170 miles of raural backroads and interstate, the bike seems to be running excellent. 55 mpgs seems great.
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xsjohn
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Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
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| Posted: June 18, 2007, 8:51 am Post subject: Re: B8ES>BP7ES |
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Autolite 63 cross references and seems to be the same plug as BP7ES ngk....Auto zone $1.43...Think grizld1 is right the extended tip seems to run better while the engine is warming up which to me means the tip cleans off faster and it also seems to axcelerate better after warming up......I'm sold so far........
John
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mcat
Full Member
Joined: May 10, 2007
Posts: 34
Location: omaha
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| Posted: June 25, 2007, 7:02 pm Post subject: Re: B8ES>BP7ES |
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what's the gap?
mcat
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jimdi
650Rider Supporter
Joined: Oct 27, 2005
Posts: 512
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| Posted: June 28, 2007, 4:49 pm Post subject: Re: B8ES>BP7ES |
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Just so everyone is clear - a BP8 is Colder than a 7 - 6 is hotter.
NGK numbers go backwards.
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Jimdi
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xsjohn
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Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA
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| Posted: June 28, 2007, 5:38 pm Post subject: Re: B8ES>BP7ES |
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Autolite 63 same as BP7ES........
John
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