Bike bogs when throttle is held wide

Sep 11, 2016
1
0
#1
I have a 2003 CRF450R that i bought in June. When I'm riding it is a beast. The only time it isn't a beast is when i hold the throttle wide open in 5th gear. It will bog down quick and then be back at full rpms. This happens within a second and it doesn't stop unless I go down to half throttle. One thing that i find weird is that i always ride while listening to music, and when it bogs my earbuds crackle and sometimes the song stops for a bit. I've run sea foam through the bike and that didn't do anything. My friends think its a bad ignition cable. I originally thought it was the carb but now i'm confused. Any help will be loved!
 
Jul 27, 1999
22,269
11,074
Chicago
www.eric-gorr.com
#2
On a bike this old it's not unusual to have corrosion in the electrical connections and/or bad grounding for the coil. Given what you have described it's worth the effort to verify the following:

- Clean grounds for the coil and CDI system
- Clean connections between the CDI unit and the stator & coil
- Adequate fuel flow from the tank to the carb
- Correct float level in the carb (FCR carbs are sensitive to this)
- Clean main jet sized correctly for the combination
 

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