Hey everyone, I am new here and have been searching for carb tuning tips for months now and can't get it right. It's always a different setup for everyone so I'm starting my own thread to hopefully figure this out finally.
I have a Sportrax 300ex with HMF slip on, and quiet core installed. Trying to get the jetting correct.
Backstory: i had the jetting close but with poping on decel but was rideable. 14 miles into a ride it just started stumbling and losing power and cutting out above 1/4 throttle. I have a gopro video od the moment it happened, was riding on a hard road and then just total crap performance. Worried that i have a bigger issue.
After several times taking carb off my current status is this.. running great on idle, no more popping, ok putting thru parking lot to trail, then as i hit first trail and get close to half throttle, stumbling cutting out,loss of power,jerky. Also have gas coming out overflow tube when this happens but not at idle.
Settings:
HMF slip on with quiet core
Slow jet: 42 (stock was 38)
Fuel screw: 2 1/4 turns
Main jet: 126 (stock was 123)
Needle: lowered one notch to richen
Carb is clean,used a rebuild kit as well
Airbox has holes drilled, might run slightly better with holes covered but hard to tell.
I feel like air is coming back out the airbox when i cut the throttle from 1/2 to none.
Increasing the slow jet from 38 to 42 did get me from the problem happening at 1/4 up to half throttle. Seems to run ok at wot. Should i increase another step?
Last 3 trips to the trail i haven't made it more than 50 yards without leaving! So i need to fix this. Thanks for any tips!
I have a Sportrax 300ex with HMF slip on, and quiet core installed. Trying to get the jetting correct.
Backstory: i had the jetting close but with poping on decel but was rideable. 14 miles into a ride it just started stumbling and losing power and cutting out above 1/4 throttle. I have a gopro video od the moment it happened, was riding on a hard road and then just total crap performance. Worried that i have a bigger issue.
After several times taking carb off my current status is this.. running great on idle, no more popping, ok putting thru parking lot to trail, then as i hit first trail and get close to half throttle, stumbling cutting out,loss of power,jerky. Also have gas coming out overflow tube when this happens but not at idle.
Settings:
HMF slip on with quiet core
Slow jet: 42 (stock was 38)
Fuel screw: 2 1/4 turns
Main jet: 126 (stock was 123)
Needle: lowered one notch to richen
Carb is clean,used a rebuild kit as well
Airbox has holes drilled, might run slightly better with holes covered but hard to tell.
I feel like air is coming back out the airbox when i cut the throttle from 1/2 to none.
Increasing the slow jet from 38 to 42 did get me from the problem happening at 1/4 up to half throttle. Seems to run ok at wot. Should i increase another step?
Last 3 trips to the trail i haven't made it more than 50 yards without leaving! So i need to fix this. Thanks for any tips!
