First of all, Mods; feel free to move this thread if you fint it’s in the wrong section.
I recently installed a HMF swamp exhaust and optimizer on my 09 Grizzly 700, already equipped with a K&N drop in air filter /stock airbox. I tried the recommended settings and mode 1 (low throttle) is always pretty much too rich, but i can live with it, mode 3 (WOT) will be fine, but mode 2 (midrange) will be way too lean no matter what i do.. I have a brand new AEM wideband AFR , so it’s easier to keep an eye on things.
For fun i did a 25km run with the optimizer plugged in (temp was about -15 celcius) and my midrange was always above 14.7, hitting often 16+ even up to 18 (ouch) low range was plenty rich, high range was plenty rich also. I tried all possible options with the Mode2 (yellow light) from 1 to 8 no change. Next morning i checked my plug, it was too white for my liking.
The following day i did the same run without the optimizer, low and high end would be less rich, but always below 13.5 on my AFR gauge, midrange would always be over 14.7 but top at around 16, not good but less worse.. I will check the plug next time before i use it.
So usually when i trail ride i either have to go slow , or give it alot of gas to stay clear of the red zone.. When i ride on roads at around 50km it seems less worse in the midrange (still lean but not scary lean). i was running Regular 87 octane freshly filled fuel.
I did not play with any other settings other than the mode 1-2-3. I wrote to HMF this morning about my situation and i’m waiting for an answer.
Anybody here had any similar issues?
Here are some pics of my setup for the curious;
