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'85 650 Nighthawk throttle problems
Posted: Thu Jun 07, 2007 8:57 am
by wapam
With the engine running and in neutral, if I rev the throttle and then release it, the throttle grip and carb linkage all snaps back but the engine speed takes a few seconds to decrease back down to idle.
Likewise when I am riding and decrease the throttle to shift the engine speed takes a few seconds to decrease.
Carbs have been cleaned and bike runs well otherwise.
Thank you for any opinions.
Re: '85 650 Nighthawk throttle problems
Posted: Thu Jun 07, 2007 9:00 am
by jonnythan
wapam wrote:With the engine running and in neutral, if I rev the throttle and then release it, the throttle grip and carb linkage all snaps back but the engine speed takes a few seconds to decrease back down to idle.
Likewise when I am riding and decrease the throttle to shift the engine speed takes a few seconds to decrease.
Carbs have been cleaned and bike runs well otherwise.
Thank you for any opinions.
I'm pretty sure it's supposed to.
My bike does it, and both of my girlfriend's manual transmission cars did that. With no load on the engine, the engine speed takes a few seconds to decrease after being revved.
Posted: Thu Jun 07, 2007 9:31 am
by wapam
So when I am riding and want to shift I release the throttle, engage the clutch, wait (coast) with the clutch in for the engine speed to slow down so I can shift smoothly, than shift and roll on the throttle???
That doesn't seem right to me. My dirt bike doesn't act like that.
Posted: Thu Jun 07, 2007 9:42 am
by jonnythan
wapam wrote:So when I am riding and want to shift I release the throttle, engage the clutch, wait (coast) with the clutch in for the engine speed to slow down so I can shift smoothly, than shift and roll on the throttle???
That doesn't seem right to me. My dirt bike doesn't act like that.
There's no reason to wait for the engine speed to slow down to match. Slowly release the clutch to engage the new gear.
Posted: Mon Jun 11, 2007 4:18 pm
by BuzZz
The rpm decrease will not be a 1:1 relationship to the throttle if it's snapped off like that, but it shouldn't be very far behind...
Check your idle speed and your low speed jet. I think the carbs may be feeding a rich mixture to your engine with the throttle closed....
Posted: Mon Jun 11, 2007 4:44 pm
by Sev
If your idle is set to high it will take a while for the rpms to drop back down after releasing the throttle.
Are you saying that it holds at one rpm for a short time, then drops down, or does it smoothly drop down to idle rpm. It should be a smooth transition without hanging or speeding up through certain areas.
It's tough to describe, but easy to show.