Poor engine braking effect - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 10-09-2006, 02:50 PM Thread Starter
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Poor engine braking effect

When closing the trottle to decrease speed (f.i. crossing lights) I found too little engine braking effect. Only after some seconds delay the engine braking comes up a little. I drove other bikes (Honda) and they were superieur.
Also with standing bike and giving some throttle the engine speed increases very good from idle up. However it takes some seconds to reach idle speed again. Any idea?
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post #2 of 8 (permalink) Old 10-09-2006, 04:39 PM
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Sounds like your throttle return line is broken or the spring has become weak. It shouldn't take any time at all for the bike to return to idle speed once the throttle is released or closed.
If you rotate the throttle to the closed position manually do you get the same results? If so there may be other carb problems.

Jim W
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post #3 of 8 (permalink) Old 10-10-2006, 01:56 AM
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try lubing all throttle lines and parts.... i.e. the throttle cables, the moving parts at the carbs and so on.... also look at the choke too, it may be half open. make sure its closed.

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post #4 of 8 (permalink) Old 10-10-2006, 04:12 AM Thread Starter
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Already checked the throttle line. Release throttle with direct closing of both throttle valves till stop ends. Checked both choke valves positions, ok.
Carbs are synchronized. Acceleration and idling is ok.
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post #5 of 8 (permalink) Old 10-10-2006, 01:03 PM
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Something is causing the carbs to stay loaded with fuel longer than normal. Another area to check would be the vacuum valve diaphrams in the carbs. If they are stiff, or pinholed, they will stay open longer than normal and not allow the engine to slow down. If the throttle mechanism is free, it's not the butterfly valves as they are connected to the throttle linkage.

Jim W
93 VN 750 "Ursula"
Moved R/R 08Sep06
R/R rewire 17Feb07
New R/R, Installed 14Jun08
New Stator installed 10 Jun08
Maintenance Free Battery 12Jan08
21480 Miles
VROC #8542
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post #6 of 8 (permalink) Old 10-10-2006, 05:57 PM
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What about the coasters? Don't they enrich the fuel when coasting? It does sound like too far advanced (not possible) or too much vacuum somewhere, like in SkyRider's post above ^

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post #7 of 8 (permalink) Old 10-10-2006, 08:09 PM
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Check all your hoses could have a vuccuum leak.........
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post #8 of 8 (permalink) Old 10-10-2006, 08:18 PM
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Vacuum leak usually implies too little vacuum, which is the opposite of what Peter is experiencing.

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$65 leather saddle bags
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relocated R/R
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