910 Brutale Vacuum in throttle bodies on high RPM - MVAgusta.net
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post #1 of 5 (permalink) Old 02-09-2018, 04:58 PM Thread Starter
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910 Brutale Vacuum in throttle bodies on high RPM

So yesterday noticed something that never have noticed on other bikes.

While I was riding pretty high RPM I shut down throttle and tried to re open it but it was "hard" to open and it seems there was so much vacuum in the throttle bodies that it resisted opening the throttle. Like vacuum was holding butterfly valves closed until I opened throttle more.

Is this normal?

- Yamaha FZ1N 2007 (sold)
- CFMoto 650NK 2013 (sold)
- CBR1000rr 2008 (sold)
- Aprilia Shiver 750 2008 (sold
- MV Agusta Brutale 910 2008
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post #2 of 5 (permalink) Old 02-09-2018, 05:48 PM
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Wald0,

Yeah, my 1078 is much the same. One of the things that make them harder to ride round town than they should be. Disconnecting the outer throttle spring helps as does a Microtec and Domino throttle.

Cheers

Deano
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post #3 of 5 (permalink) Old 02-09-2018, 05:49 PM
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Quote:
Originally Posted by Wald0 View Post
So yesterday noticed something that never have noticed on other bikes.

While I was riding pretty high RPM I shut down throttle and tried to re open it but it was "hard" to open and it seems there was so much vacuum in the throttle bodies that it resisted opening the throttle. Like vacuum was holding butterfly valves closed until I opened throttle more.

Is this normal?
Yes, it's normal on MVs......the throttles are built backwards

The big side of the blade should be on the downhill side, so vacuum helps open the
throttles not try to lock them closed

Only throttles I know like this?????
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post #4 of 5 (permalink) Old 02-09-2018, 07:00 PM
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Quote:
Originally Posted by theknurl View Post
Yes, it's normal on MVs......the throttles are built backwards

The big side of the blade should be on the downhill side, so vacuum helps open the
throttles not try to lock them closed

Only throttles I know like this?????
Turns out Kawasaki did this on some of their road bikes as well as KXF dirt bikes, bad idea as you say Noel.
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post #5 of 5 (permalink) Old 02-10-2018, 10:46 AM Thread Starter
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Quote:
Originally Posted by Deano View Post
Wald0,

Yeah, my 1078 is much the same. One of the things that make them harder to ride round town than they should be. Disconnecting the outer throttle spring helps as does a Microtec and Domino throttle.

Cheers

Deano
Yes, that outer spring I already disconnected. How does Domino help?

- Yamaha FZ1N 2007 (sold)
- CFMoto 650NK 2013 (sold)
- CBR1000rr 2008 (sold)
- Aprilia Shiver 750 2008 (sold
- MV Agusta Brutale 910 2008
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