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Old 07-20-2014, 12:20 AM
fischer550 fischer550 is offline
Motorized Bicycle Elite Member
Join Date: Mar 2014
Location: Fort Collins, CO
Posts: 233
Default Running amazing, but too lean.

So I was having 4 stroking issues at low rpm's and my motor was feeling sluggish. I am at 5,000 ft above sea level and using opti 2 at 100:1. I was running an nt carb with a .60 jet, and the needle set at the top (leanest) and these were my issues. My plug would always be black, with these settings.

But then I tried something else.

I got an NT speed carb and an HD lightning CDI. WOW

For the speed carb, I put the same jet (.60) literally the same one as the nt, and did the same needle setting. I am not lying, the motor felt so good, there was no more 4 stroking and she just felt strong, and for once I was really enjoying the ride.

Put in a new plug, and went on a 4 mile ride (which in my past experience is enough to get some color on the plug). I was going half-3/4 throttle most of the time, and at the end of the ride I rode about 10 secs WOT and then shut it down without letting her idle.

Plug=white. not even the smallest trace of oil on this plug.

Now I am going to do some jetting changes tomorrow, I am just looking for why this would happen with the same settings as the nt carb? Just curious and want to learn. Thank you!

Last edited by fischer550; 07-20-2014 at 12:23 AM.
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