When my 08 Vee suddenly started sputtering and coughing, I was 500 miles from home. I had to feather the clutch quite a bit in order to get the rpms up high enough that the bike would want to run at what felt like normal. Any pull up an incline demanded down shifting and running the rpms up in order to maintain speed. It started backfiring inside the air box. Is your sputtering and coughing leading to any of these symptoms? For my Vee, it turned out to be a clogged high pressure fuel filter on the fuel pump inside the tank. I would suggest you do the fuel flow test to ensure you are getting adequate fuel when your wrist demands it. There are a bunch of threads on the forum for how to do that. If the flow is inadequate, read up on doing the external fuel filter bypass. IF the fuel flow is sufficient, then check the boots inside the air box connecting to the throttle bodies. Make sure they are sealed properly and not allowing air to bypass. Also, check up on performing a throttle body sync so that both are pulling at the same pressures. All of these are easy to do and all of them are covered in numerous threads here.
Mid-range sputtering.
Recently bought a used 04 Vee with 12k on it. Now at 14k after a couple of months and now the bike is sputtering and coughing at mid-range ( between 3 and 4 thousand rpm). Would like to know the cause of this and how to get this cleaned up. The bike is stock and has been well maintained. Other than the mid-range sputtering, the bike runs strong. The latter is annoying AF though ! Anyone else have this issue ?
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Throttle body sync, throttle position sensor replace and adjustment, yosh box tune and cam sensor were all the steps I went through to cure this on my bike, but mine was beat and abused .Recently bought a used 04 Vee with 12k on it. Now at 14k after a couple of months and now the bike is sputtering and coughing at mid-range ( between 3 and 4 thousand rpm). Would like to know the cause of this and how to get this cleaned up. The bike is stock and has been well maintained. Other than the mid-range sputtering, the bike runs strong. The latter is annoying AF though ! Anyone else have this issue ?
these bikes were tuned too lean from the factory, the main cause of these symptoms.
Fuel pump and filter can be problematic too and eventually will need to be addressed most likely.
I banged my head for a while with this but the cam sensor was the final piece that made my bike run right.
If I bought another, I would immediately replace the tps, cam sensor, do the fuel pump filter mod and do a yosh box tune and throttle body sync to save myself the headache.
Hello, I had one a few years back and a plug in "Booster plug" cured it , basically it moves the position of the air temperature sensor from inside to outside the air box , on the uk bikes its for emissions, I guess it's the same in the states, cheers, TonyRecently bought a used 04 Vee with 12k on it. Now at 14k after a couple of months and now the bike is sputtering and coughing at mid-range ( between 3 and 4 thousand rpm). Would like to know the cause of this and how to get this cleaned up. The bike is stock and has been well maintained. Other than the mid-range sputtering, the bike runs strong. The latter is annoying AF though ! Anyone else have this issue ?
”yosh box” is a Yoshimura fuel injection tuning device for SuzukisWhat’s a gosh box?
you can do a search and find extensive threads here including schematics to build one.
It flashes the ecu and is not permanently insalled like a power commander
The most common cause of this is the fuel pump especially if the bike has sat for some time, that bike have very low Ks for it's age.
Start with a fuel flow test, it is easy, free and can tell you a lot.
Look at a fuel filter bypass, it can solve the pump issues.
It is the internal filter that blocks up not the bag/screen on the end of the pump that causes the issues.
Start with a fuel flow test, it is easy, free and can tell you a lot.
Look at a fuel filter bypass, it can solve the pump issues.
It is the internal filter that blocks up not the bag/screen on the end of the pump that causes the issues.
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