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Spark plug replacement
Discussion at Motorized Bicycle Engine Kit Forum in the Bicycle Engine Kits forum. I'm going to fire mine up with a B7HS - just for ****z and giggles. I got it for $1.
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05-26-2008, 05:18 PM
|  | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 1,401
| |  Re: Spark plug replacement
I'm going to fire mine up with a B7HS - just for ****z and giggles. I got it for $1.
I normally run a B5HS with no issues, so I'll let you know how a plug two steps cooler does. (not necessarily a smart move) |
05-26-2008, 07:14 PM
| | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 1,401
| | Re: Spark plug replacement
The B7HS did just fine....if anything, once warmed up it pulled a bit better. |
05-27-2008, 04:53 AM
| | Master Motorized Bicycle Builder | | Join Date: Mar 2008 Location: Daytona Beach
Posts: 201
| | Re: Spark plug replacement
First picture is of Dimonfire do not know what number, but is the Cj7y champion equivaliant. Second red arrow is the stock plug. See how the stock plug reaches all the way down, and the Dimonfire does not. I get carbon on the last 2 or 3 threads which makes it really hard to screw in the regular length plug because of carbon. You would have to take the top part of your engine the part that the plug goes into and scrape carbon off to go back to a regular length plug.  
Last edited by sisdavid : 05-27-2008 at 04:54 AM.
Reason: forgot
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05-27-2008, 04:58 AM
| | Master Motorized Bicycle Builder | | Join Date: Mar 2008 Location: Daytona Beach
Posts: 201
| | Re: Spark plug replacement
Quote:
Originally Posted by toytime  I am now going with a Champian L86c and I love the new sound I seem to be getting.
The plug is a bit too long and I may end up with probs. when I go to remove it but it did change the sound and feel of the bike, almost as if it is running a little richer now, from the sound of things. I have also used the "40501" which is what I seem to remember being an NGK but looking at it now, there is no "ngk" marking. |
Toy Time a longer plug may creat a sittuation that requires you to take the top part of your head off to take the plug out because of carbon. |
05-27-2008, 05:28 AM
|  | Moderator | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 3,066
| | Re: Spark plug replacement
So then the Champion CJ7Y is off the list.
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If it ain't broke, and you mess with it long enough, it will be. |
05-27-2008, 05:30 AM
| | Moderator | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 3,066
| | Re: Spark plug replacement
I have had very good results with the Autolite plug.
__________________
If it ain't broke, and you mess with it long enough, it will be. |
05-27-2008, 07:40 AM
| | Master Motorized Bicycle Builder | | Join Date: Mar 2008 Location: Daytona Beach
Posts: 201
| | Re: Spark plug replacement
I think the CJ7Y Champion should be off of the list because if you go back with a plug with the longer threads you have to take the head off to get the carbon off |
05-27-2008, 11:59 AM
|  | Moderator | | Join Date: Mar 2008 Location: Tucson,Arizona
Posts: 1,779
| | Re: Spark plug replacement
Just a reminder, I alway's use thread ant-sieze on my plug. 
Last edited by fairracing31 : 05-29-2008 at 03:48 PM.
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05-27-2008, 02:42 PM
| | Moderator | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 3,066
| | Re: Spark plug replacement
Always! And never remove a very hot plug.
__________________
If it ain't broke, and you mess with it long enough, it will be. |
08-28-2008, 09:22 PM
| | Motorized Bicycle Apprentice | | Join Date: Aug 2008 Location: NASCAR Country
Posts: 3
| | Re: Spark plug replacement
I have two engine kits. I have a 50 and an 80. The Chinese plug that came with the 50 had a reference number to NGK BP7HS. I have successfully used NGK BPR7HS and an Autolite 4123. Great Plugs. Does anyone know how long a plug should last (in general)? I've been running the Autolite 4123 for almost a year and it hardly has any erosion on the center electrode.
Last edited by Down_South : 08-29-2008 at 12:57 AM.
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