Freshman Rider
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Posts: 94 
Likes: 3
Joined: Apr 30, 2014 2:44:28 GMT -5
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Post by userix on Jul 28, 2014 13:34:31 GMT -5
Recently when I was riding around for a while, I noticed that after a good couple minutes of straight WOT, I lose a lot of low-end acceleration power/torque. It takes a long time to accelerate from a stop back up to speed. It's not the clutch or belt slipping, but the actual engine losing power, but it's only the low-end power that's weak. Once I get past 30mph, it continues to pull like it should normally without any power loss or hesitation. Only from a standstill, the acceleration is very slow. No bogging or exhaust popping noises, just overall flatter acceleration from stop.
Is this a sign of engine overheating? Like it's getting too hot? It was never like this a month ago and nothing really changed in terms of the engine and parts.
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Post by ramblinman on Jul 28, 2014 17:41:22 GMT -5
you say it only happens after you ride at WOT for awhile, yes? my first thought would be the clutch. if the torque spring is wore out or broken the clutch pulley won't close to push the belt back out when you slow down.
i could be wrong but that is the first thing i would inspect.
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Post by geh3333 on Jul 28, 2014 19:23:20 GMT -5
Check your cvt , ramblinman may be right " at least a cvt problem" it will feel as if your engine has lost low end torque if your cv is stuck in a so called " taller gear" .
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Post by geh3333 on Jul 28, 2014 19:28:20 GMT -5
Check your cvt , ramblinman may be right " at least a cvt problem" it will feel as if your engine has lost low end torque if your cv is stuck in a so called " taller gear" . If it were an overheating issue I'd expect it to lack power at all bottom and top range. |
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Freshman Rider
Currently Offline
Posts: 94
Likes: 3
Joined: Apr 30, 2014 2:44:28 GMT -5
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Post by userix on Jul 30, 2014 3:21:02 GMT -5
Yeah, I figured if it was an overheating problem, I would notice the loss of power throughout the whole range. But it weird that it only happens after WOT and it seems to regain the low-end acceleration after I sit idling still for a few minutes, as if cooling down makes it return to normal acceleration power. So is it as if the clutch itself is overheating, in combination with a bad torque spring?
Is there any other causes of the engine being sluggish at low-end acceleration?
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Post by rockynv on Jul 30, 2014 6:10:01 GMT -5
Usually at WOT there will not be enough vacuum in the intake to keep a vacuum petcock open and additionally the pulse will be too weak to run a vacuum fuel pump so either way you will be potentially running with a low fuel level in the carburetor bowl which can cause a lean and hot condition. When running lean you could also start to experience a mild soft seize condition which you will need to ride gently for a few minutes to resolve before stopping to allow the cooling fan to compensate or just pull over and stop for 15 minutes. If you run WOT regularly and are not using Premium fuel then your valves will be hammering the valve seats and potentially driving them deeper into the head which will also cause performance issues and require more frequent valve adjustments.
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