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Author: Subject: Yamaha 5vy Throttle Issue.
cfc999

posted on 10/5/23 at 10:14 AM Reply With Quote
Yamaha 5vy Throttle Issue.

The throttle on myR1 5vy seems to be sticking. When I press the accelerator pedal the engine responds and as expected the revís increase .When I release the throttle the pedal springs back but the engine revs remain high before dropping as if something is sticking.
The cable is relatively new and checked both the pedal and the throttle linkage both of which spring back as soon as your release the throttle. Could this mean Iíve got a faulty throttle position sensor.

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Slater

posted on 10/5/23 at 11:21 AM Reply With Quote
Hi
Do you have a throttle return spring fitted? Essential for bike carb set ups.

https://www.locostbuilders.co.uk/viewthread.php?tid=205928

I can't access the pic in my photo archive for some reason. But I think it's in the thread above.....





Why do they call Port Harcourt "The Garden City"?...... Becauase they can't spell Stramash.

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cfc999

posted on 10/5/23 at 11:56 AM Reply With Quote
Thanks will have a look. Pretty sure itís fitted.
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adithorp

posted on 11/5/23 at 01:21 PM Reply With Quote
I had the same issue with my 5vy initially. Others have had to do the same. On the bike there's a cable to open and another pulling it closed and in a single, cable car install it doesn't close as positively.

I fitted an extra return spring and that cured it.





"A witty saying proves nothing" Voltaire

http://jpsc.org.uk/forum/

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cfc999

posted on 11/5/23 at 04:01 PM Reply With Quote
Cheers
Will have a look when I get time.
The pedal and butterflies both seem to spring back when I manually release them but like you say only running the one cable so sounds like that could be the issue.

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motorcycle_mayhem

posted on 11/5/23 at 06:42 PM Reply With Quote
Have a look around the various stops, etc. There's a thermostatic lifter in the middle of the TB's, sometimes interferes.
Air leaks, bleed screws, fouling hoses and clips, etc., all good culprits.
There should be no issue with a single cable and the OE return springing, served me well on a 5VY Jedi, with a very long cable run.

Best engine note I've ever had, the 20V screams, enjoy.

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cfc999

posted on 11/5/23 at 08:16 PM Reply With Quote
Snap.
Will take a close look on my 5vy powered Jedi !!!!!!

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adithorp

posted on 12/5/23 at 09:29 AM Reply With Quote
quote:
Originally posted by cfc999
Cheers
Will have a look when I get time.
The pedal and butterflies both seem to spring back when I manually release them but like you say only running the one cable so sounds like that could be the issue.


Yeah, mine shut fine but when running suffered slight hang-up when running. Never worked out exactly why but an extra spring sorted it.





"A witty saying proves nothing" Voltaire

http://jpsc.org.uk/forum/

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