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| Spark plug caps for MT and CR250M?? https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=3091 |
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| Author: | Grae UK [ Mon Sep 12, 2011 6:49 am ] |
| Post subject: | Spark plug caps for MT and CR250M?? |
Hi, I'm looking to fit a new plug cap and HT lead to my MT/CR hybrid. I use NGK B9EV plugs and wondered what NGK plug cap to use as there are so many different ones out there either suppressed or non suppressed. Do I need a suppressed cap and if so, what ohm, or do I need non suppressed? Whatever cap I go for wants to be waterproof. Anyone got any ideas of what I actually need? Many thanks in advance, Grae |
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| Author: | rayivers [ Mon Sep 12, 2011 9:23 am ] |
| Post subject: | Re: Spark plug caps for MT and CR250M?? |
Grae, I use only non-suppressed (no resistor) plug caps with vintage ignitions, on the theory that there's not a lot of excess spark energy to throw away. I've also seen cap resistors burn out, which can be difficult to diagnose unless you're looking for it. I use non-resistor plugs for the same reason, but many of the precious-metal-electrode ones (BxEV, BxEVX, BPxEV, etc.) have been discontinued and are getting harder to find. I use BP7EVX's or BP8EV's in my Hondas, my buddy uses a BP7ES in his MT250. Here are the NGK caps: http://www.sudco.com/spark.html#cover I've used the LZFH (non-resistor) and LB01EP (1K resistor) caps, which both worked fine. Even though my bikes use the aluminum terminal 'nuts', I believe that removing the nuts and using the LZFH-type caps that grip the threads directly is the way to go - they hold really tight, and all the looseness/oxidation/etc. issues go away. Both are waterproof, and the seals fit real tight on the plug. I make a hole in the middle of the plug wire strands and spread them apart in a cone shape with a small pick before putting the plug on the cable. I've had the cap screw tunnel in between the cable and the rubber sheath a bunch of times, and the cap never feels tight and sometimes starts cutting out. Ray |
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| Author: | Grae UK [ Wed Sep 14, 2011 3:45 am ] |
| Post subject: | Re: Spark plug caps for MT and CR250M?? |
Thanks Ray, that was the information I was looking for! I'll get a LZFH plug cap on order. Grae. What a great site this is! |
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