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Author Topic: GV650 wont high rev when going down the road  (Read 76 times)

ThatServerGuy

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GV650 wont high rev when going down the road
« on: June 06, 2018, 04:05:05 PM »

My GV650 won't rev high without choking down while going down the road but I can redline while in neutral or while holding in clutch.

Any ideas?
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Christianleon266

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Re: GV650 wont high rev when going down the road
« Reply #1 on: June 06, 2018, 04:21:47 PM »

Wide open throttle with a load vs blipping the throttle to red line are two different things, With no load you can achieve red line with just a touch of the throttle. With a load, however, you need more fuel and air to get things going, thus more throttle twist to achieve the same results which varies with what gear your in.

What gear does this happen? What position of the throttle? Wide open, 3/4, cruising? By choking down do you mean applying choke or the bike seems like its choking/ sputtering? Any mods, recent or past? 
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ThatServerGuy

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Re: GV650 wont high rev when going down the road
« Reply #2 on: June 06, 2018, 04:45:30 PM »

Under load throttle at about 50% in all gears chokes and sputters. If I hold wide open it will eventually choke and die and will recover at speed. Chokes, spits, sputters.
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spit051261

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Re: GV650 wont high rev when going down the road
« Reply #3 on: June 06, 2018, 04:54:16 PM »

Sounds like electrical to me .
Have you checked battery connections , regulator , coils , HT leads and spark plugs ?
I say this because you get the fault when it's moving and not stationary .
Might be wrong but that is where I would start and it's a lot easier than messing around with the next possible fault if it's not electrical .........fueling :o
« Last Edit: June 06, 2018, 04:57:18 PM by spit051261 »
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Christianleon266

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Re: GV650 wont high rev when going down the road
« Reply #4 on: June 06, 2018, 05:01:36 PM »

Here is some probable causes and solutions for you.
1. Main Jets and associated air jets are clogged
2. Slides are frozen, gummed up, diaphragms torn or otherwise inoperative.
3. Fuel pump or fuel petcock (do you have vacuum or electric pump?) flow inadequate or otherwise restricted.
4. Carburetor float height too low, causing fuel starvation.
5. Humungous vacuum leak somewhere. Doubtful but not unlikely.

1, 2 and 4 require a tear down and cleaning/ rebuilding of the carbs to find the issue. There are a few guides floating around here on how to do this, both here and floating around the internet.
3. requires testing the flow of the fuel just before carb inlet when bike is running.
5. can be found by spraying carb cleaner around the intake boots and vac lines to find a leak. Would honestly clean carbs out of general principle.

Just above half throttle is when the main jets start to take over the fuel demands, with death of the bike it sounds like they are blocked, or the jet needle responsible for metering said fuel isn't lifting as it should, which would also lead from sputtering to a gradual death the more throttle you give it. Low levels of fuel in bowls will mimic these symptoms as well, almost to a tee.
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2007 Kawasaki KX250F
1984 Yamaha Virago
1982 Honda V45 Sabre
1996 Kawasaki ZX6R
2009 Kawasaki Ninja 250
1984 Honda V65 Magna (Favorite)
1982 Kawasaki KZ750E
2005 Suzuki M50
1983 Honda Goldwing Aspencade
2007 Hyosung GT250R
1991 Honda ST1100 (current)

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