Low profile plug and cap?

MOTOMTB

Member
Local time
8:02 PM
Joined
Jan 15, 2009
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73
Hey guys,

I just bought one of those cool performance billet heads on ebay, everything is cool and I'm all set to ride but because the plug sits straight up, I just don't quite get enough clearance for my gas tank. I'm just wondering if there exists a shorter BH6S plug and cap out there, or possibly just a more low profile cap, that would probably work, all I need is a 1/4" of clearance. Any suggestions, please let me know ASAP. Thanks

J-
 
get an ngk bpm6a. if you need a shorter plug boot you can just trim the one you've got to length
 
eh thanks so much man, I owe you one, basically exactly what I was looking for. So will there be any performance difference or is it just a direct replacement but short insulator?
I think I should be able to take the lower rubber part off the boot so it will fit this plug...
 
it's meant to be a direct replacement, but I'm sure there's some kind of downside to using the shorter insulator. Whatever that downside is, I've never found it.
 
it's meant to be a direct replacement, but I'm sure there's some kind of downside to using the shorter insulator. Whatever that downside is, I've never found it.

Ok, well in this case I have no choice if I want to use the billet head.
 
Lol. it is 90 degrees. The plug itself is too long. Just bought a short one today. Going to try it out.
Just trying to help. Lots of people put the straight boot wire on, then have clearance issues. Glad you got er solved. Sometimes these builds come down to a millimeter here or there.
 
Hey Purple.. don't worry I appreciate it anyway! I didn't have a picture anyway so not your fault :) Big thanks to Brute also for the quick reply. Forums help so much, as opposed to spending half a day running around town searching. I just went to the local utility store and picked one up. Thanks again guys!
 
bpm5-6-7a, brm,bprm, and im sure theres another letter that just signifies the hex size as well. "J" possibly... couldnt be bothered googling anything! and one for the taper seat versus the washer/gasket. now i think thats the J!

B is the thread, in this case, 14mm.
P is a projected tip. i personally avoid them.
M is the size of plug...standard or M for mini :)
R is the resistor version. i like resistors in my spark plug as well as the cap and the lead.
the numbers are the heat range, lower for engines that get idled a lot in low temperature climates, higher for ones that get run WOT in the middle of summer.
the A or more normally H on these engines is the thread length. theres about 1mm difference between the H and A, whereas the "E" is 19mm long or another 6mm+... avoid!

anything else like IX stuck on the end means fancy electrodes. IX is specifically iridium. if its NGK, anyway.

all that matters is the b, m, numbers,and the a(or h)

so a bm8h would do but is more than likely impossible to find!(ngk, for some reason, wont actually list every plug they make...) the one problem with "non standard" plugs is less heat variants available.

other alternatives are champion CJ8, common mower/yard tool type plug. torch, denso and bosch, the numbers fail me at this point in time...


at least you had the sense not to get a slant head :)
 
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