2019 Hawk 250 jetting settings and question

bmw111 · 05-29-2020, 11:36 PM

2019 Hawk 250 -- stock other than changing to a PZ30 Keihin from eBay.

Main jet: 110
Pilot Jet: 45
Needle: 4th notch from top
Idle Mixture Screw: 1.5 turns out
Altitude: 1000 ft

Starts up with little to no choke (finally!) and settles into a reasonable idle. No more stalling, sputtering, and warming up for 20 minutes. Feels much fatter throughout the rev range. Definitely more pick up from 50 to top speed.

Only issue I have is that once the bike is warmed up -- which doesn't take long now -- and I am riding anywhere from 10 mph up, it stutters or surges (not really a stumble) at around 1/8 steady throttle. Feels almost like a fuel injection model that is hyper sensitive and hunts between throttle on and throttle off.

Any ideas?

05-29-2020, 11:36 PM	#1
bmw111 Join Date: Mar 2020 Location: NorthEast Posts: 71	2019 Hawk 250 jetting settings and question 2019 Hawk 250 -- stock other than changing to a PZ30 Keihin from eBay. Main jet: 110 Pilot Jet: 45 Needle: 4th notch from top Idle Mixture Screw: 1.5 turns out Altitude: 1000 ft Starts up with little to no choke (finally!) and settles into a reasonable idle. No more stalling, sputtering, and warming up for 20 minutes. Feels much fatter throughout the rev range. Definitely more pick up from 50 to top speed. Only issue I have is that once the bike is warmed up -- which doesn't take long now -- and I am riding anywhere from 10 mph up, it stutters or surges (not really a stumble) at around 1/8 steady throttle. Feels almost like a fuel injection model that is hyper sensitive and hunts between throttle on and throttle off. Any ideas?
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