165fmm and nibbi PE28FL tuning questions.

NathanTC · 04-06-2022, 10:55 PM

Ok so my XMOTOS 250 has the 165fmm engine and i just installed a Nibbi PE28FL carb. The factory air box is not a possibility with this carb so im running this pod filter found here.
https://www.amazon.com/dp/B0897KHTZB...roduct_details

So far the ONLY settings that make the bike run ALMOST perfect are as follows
Throttle needle at its absolute highs position
air screw two turns out
42 pilot jet
115 main jet

any deviation at all with jetting nets negative results, same for air screw and needle position

Bike runs way stronger than it ever did stock. Just there is a slight hesitation/bog right off idle. Sucks when you need to pop up the front tire. My dad suggested putting a sock over the air filter which helped but didn't eliminate it.

Spark plug is an E3 and shows that the bike is running about perfect. Both valves are set at 0.10MM or basicly 0.004

My question is this. Is it the filter making it impossible to tune perfectly? I can make it either to rich or to lean so i would think there is something im missing here.

04-06-2022, 10:55 PM	#1
NathanTC Join Date: Mar 2022 Location: Lumberton TX Posts: 36	165fmm and nibbi PE28FL tuning questions. Ok so my XMOTOS 250 has the 165fmm engine and i just installed a Nibbi PE28FL carb. The factory air box is not a possibility with this carb so im running this pod filter found here. https://www.amazon.com/dp/B0897KHTZB...roduct_details So far the ONLY settings that make the bike run ALMOST perfect are as follows Throttle needle at its absolute highs position air screw two turns out 42 pilot jet 115 main jet any deviation at all with jetting nets negative results, same for air screw and needle position Bike runs way stronger than it ever did stock. Just there is a slight hesitation/bog right off idle. Sucks when you need to pop up the front tire. My dad suggested putting a sock over the air filter which helped but didn't eliminate it. Spark plug is an E3 and shows that the bike is running about perfect. Both valves are set at 0.10MM or basicly 0.004 My question is this. Is it the filter making it impossible to tune perfectly? I can make it either to rich or to lean so i would think there is something im missing here.
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