| Vintage Dirt Bike Q & A https://vintagedirtbikeforums.alp-sys.com/ |
|
| SPARKPLUG AND OIL PREMIX QUESTION FOR MY 76 ELSINORES https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=2567 |
Page 1 of 1 |
| Author: | davidwheat [ Sat Nov 21, 2009 9:12 am ] |
| Post subject: | SPARKPLUG AND OIL PREMIX QUESTION FOR MY 76 ELSINORES |
2 part question  1. can i run a BR8EG plug instead of the 9's the honda guy told me it would give a hotter spark. he said that you could move up or down one.. what are you using 2. what premix oil are you using.. i find i am fouling alot of plugs i have a 76 cr125 and cr250 thanks guys |
|
| Author: | rayivers [ Sun Nov 22, 2009 8:12 am ] |
| Post subject: | Re: SPARKPLUG AND OIL PREMIX QUESTION FOR MY 76 ELSINORES |
I'm running the same ignition as your CR125 in two of my bikes, and NGK BP7ES plugs work well in both of them. I was running BPR7EIX plugs before, but one bike wouldn't idle reliably with the resistor plug. Maybe you'd want to start with BP8ES plugs in your bikes. The projected-nose ('P') plugs gave slightly better throttle response and low end in my bikes; I won't use anything else nowadays. If a resistor plug works for you, that's great, but in these old CDI's I was getting a faint yellow-looking spark. Inserting a 4,500 ohm resistor in the ignition path may give better radio reception and more reliable on-board computer operation, but it sure didn't improve performance in my bikes. Unfortunately, not too many non-resistor plug types are available today. Here's some NGK plug code info: B = Thread size 14 mm, P = projected nose, R = resistor, 7 = heat range, E = 19mm reach, S = copper core, I = Iridium, X = series gap, V = precious metal tip I haven't fouled a plug since I stopped using leaded race gas, for what that's worth. I've used Bel-Ray oil since the early 70's, and today I use H1R ay 36:1. There are plenty of other good oils out there, though. Ray |
|
| Author: | b-joe [ Mon Nov 23, 2009 1:54 pm ] |
| Post subject: | Re: SPARKPLUG AND OIL PREMIX QUESTION FOR MY 76 ELSINORES |
if your bikes didn´t run well with 9´s plugs something is wrong. check your carb, airfilter or other things. |
|
| Author: | mitchie [ Tue Nov 24, 2009 2:53 pm ] |
| Post subject: | Re: SPARKPLUG AND OIL PREMIX QUESTION FOR MY 76 ELSINORES |
32:1 mix is good for all these bikes. I run mine 28:1 summer and 32:1 winter. An 8 plug is acceptable, but if you are fouling 9s then you do have a problem. A lot of times, the needle jet and jet needles get worn on these old Keihin carbs. All the jetting in the world won't fix it and good luck finding the right replacement parts. So, if your jetting is right, your air filter is clean, your carb is clean and you're still experiencing fouling, I'd look at one of two things: leaking right hand crank seal or finding a new jet needle and needle jet for your carb (or give up like a lot of us and just buy a 36 mm Mikuni carb). If you aren't losing transmission oil, it probably isn't a crank seal, but the loss can be so minimal you might not notice. A leak-down test will check the integrity of the seals. |
|
| Page 1 of 1 | All times are UTC - 7 hours [ DST ] |
| Powered by phpBB® Forum Software © phpBB Group https://www.phpbb.com/ |
|