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79elco · 05-07-2016, 10:45 AM

I have the mikuni clone, 115/30 jets. I have modified the air box lid to allow more air in. Practicing for motorcycle test I noticed engine running poorly. Quickly clears up with revving engine. I read the NGK website that talks about the need for a hotter plug..."slow operation plug becomes loaded" . This is what mine was doing. I have noticed soot at the he rear of the muffler. Black bike is clean...not an issue on that bike. I installed NGK DR7EA plug. Gapped .7 mm. Now for the results .... No stumble at first acceleration leaving a stop sign. RPM increases rapidly. Able to accelerate in 5th gear up a steady slight grade. Previously I would not accelerat, It was slowing down at full throttle. It's a small tweak with great results. Hope others can find this helpful. I didn't want to take off the carb again. Easy fix.

05-07-2016, 10:45 AM	#78
79elco Join Date: Mar 2016 Location: Dark Corner, South Carolina Posts: 78	Spark plug change.. I have the mikuni clone, 115/30 jets. I have modified the air box lid to allow more air in. Practicing for motorcycle test I noticed engine running poorly. Quickly clears up with revving engine. I read the NGK website that talks about the need for a hotter plug..."slow operation plug becomes loaded" . This is what mine was doing. I have noticed soot at the he rear of the muffler. Black bike is clean...not an issue on that bike. I installed NGK DR7EA plug. Gapped .7 mm. Now for the results .... No stumble at first acceleration leaving a stop sign. RPM increases rapidly. Able to accelerate in 5th gear up a steady slight grade. Previously I would not accelerat, It was slowing down at full throttle. It's a small tweak with great results. Hope others can find this helpful. I didn't want to take off the carb again. Easy fix.
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