Power loss at higher rpms
#1
Power loss at higher rpms
So I'm having a little trouble diagnosing my bike. It's a 1998 cbr600f3. It started having some carb issues a couple months ago and so I had somebody rebuild them completely with all new Jets needles floats gaskets and o rings. It ran great for a couple of months.. And then started having a bunch of electrical issues with the fuel pump. I got all that sorted out. Fuel pumps working great , it's brand new. but when I get to about 5 to 7 RPMs it starts sputtering and total power loss. Definitely feels like a fuel issue but it can't be the carbs because they were so recently done. When the bike is in neutral I can rev it up past 7 and it sounds super clean. Doesn't stutter at all. But as soon as I'm in gear it feels like a fuel starvation issue. I've changed the stator, the regulator rectifier, the fuel cut relay, brand new fuel filter fuel pump and air filter. Also new spark plugs. I have no idea what it's doing but it's really starting to **** me off. Any help would be much appreciated
Last edited by Chris Kenney; 07-23-2018 at 06:40 PM.
#2
I was having the same issue with my bike. Cleaned the carbs drained the tank flushed the filter out. Put fresh gas 93 octane and 3/4 bottle of seafoam. Just ran it through the tank today and I got all my power back.
It literally happened well I was riding, my bike would sputter at 8k and on the trip home it was all good.
I suggest putting some seafoam in and running the tank till it really gets through it.
It literally happened well I was riding, my bike would sputter at 8k and on the trip home it was all good.
I suggest putting some seafoam in and running the tank till it really gets through it.
#3
I was having the same issue with my bike. Cleaned the carbs drained the tank flushed the filter out. Put fresh gas 93 octane and 3/4 bottle of seafoam. Just ran it through the tank today and I got all my power back.
It literally happened well I was riding, my bike would sputter at 8k and on the trip home it was all good.
I suggest putting some seafoam in and running the tank till it really gets through it.
It literally happened well I was riding, my bike would sputter at 8k and on the trip home it was all good.
I suggest putting some seafoam in and running the tank till it really gets through it.
#4
#5
In a round about way that is true. A more technical way to look at it is when you sync your carbs you are compensating for the small imperfections in the mechanical parts as well as the difference in valve clearances. The end goal is you want all four carbs to act in perfect unison as they create vacuum. That is why one adjustment screw can be x amount of turns in and another y amount. In reality it isn't hard but it does take patience as even the smallest tweak on an adjustment screw has a direct affect on the others. There's a lot of give and take if will.
As GameKiller7 pointed out, you can remove the bowls without getting things out of sync.
#7
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