# f4 sr 750 idling rough when hot - MVAgusta.net
log in
|
|


Forum
Go Back   MVAgusta.net > Technical and Hands On > Maintenance & Tech. Issues (All 4 Cyl. Models)
Register FAQ Members List
Reply
 
Thread Tools Display Modes
Old 11-08-2012, 10:34 PM   #1
mvrob
Senior Member

MV in the Registry:
[F4 750 SR]

 
mvrob's Avatar
 
Join Date: Dec 2009
Location: australia
Posts: 115
Default f4 sr 750 idling rough when hot

my sr 750 has started idling rough when it gets hot. it only seems to do it in stop start traffic.it's going to the mechanic next week i just want to try and narrow down what could cause it

thanks rob
mvrob is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 11-08-2012, 11:37 PM   #2
theknurl
Senior Member


 
theknurl's Avatar
 
Join Date: Jul 2009
Location: Palos Verdes Est, SoCal, USA
Posts: 8,901
Send a message via Skype™ to theknurl
Wink ?

Rob;
check the hose clamps on the intakes.......guaranteed they're loose
also the check the vacuum tubes and caps* from the throttle bodies to the side fittings

*on my '05 they were cracked and leaking
__________________
Noel-theknurl

The Forum Curmudgeon
i'm not PC either

ph. 310-414-7247 PST, GMT -8
email, PayPal; theknurl@yahoo.com
Skype; theknurl
theknurl is online now   Reply With Quote
Old 11-09-2012, 12:23 AM   #3
mvrob
Senior Member

MV in the Registry:
[F4 750 SR]

 
mvrob's Avatar
 
Join Date: Dec 2009
Location: australia
Posts: 115
Default

Quote:
Originally Posted by theknurl View Post
Rob;
check the hose clamps on the intakes.......guaranteed they're loose
also the check the vacuum tubes and caps* from the throttle bodies to the side fittings

*on my '05 they were cracked and leaking


thank you very much noel i'll check them
i love this forum you guys are always really helpful

rob
mvrob is offline   Reply With Quote
Old 11-11-2012, 09:41 PM   #4
mvrob
Senior Member

MV in the Registry:
[F4 750 SR]

 
mvrob's Avatar
 
Join Date: Dec 2009
Location: australia
Posts: 115
Default

fixed noel your diagnosis was spot on as usual all 4 caps were cracked/split i think you should write a book.
we can call it dr knurl's guide to mv mechanics lol

thanks rob
mvrob is offline   Reply With Quote
Old 11-12-2012, 12:43 AM   #5
theknurl
Senior Member


 
theknurl's Avatar
 
Join Date: Jul 2009
Location: Palos Verdes Est, SoCal, USA
Posts: 8,901
Send a message via Skype™ to theknurl
Wink cracks?

mvrob;
the manual says replace all the in-tank lines every 3 years......

i read that as THEY know they are using low grade lines......forget ethanol, they wrote that 13 years ago....before ethanol

so all fuel system rubber is suspect.....ozone eats it....it shrinks or cracks

i have 2 MVs both bought used...1st thing i did? replaced fuel lines, fuel filters, vacuum lines, caps and tightened the intake clamps

i started working on exotic cars in '59...if they didn't run right you looked for air leaks...... spray butane at it, if the engine changes sound... its leaking

when you have some time get a tube of dielectric grease and lube EVERY electrical connector on the bike......i live 3 blocks from the Pacific Ocean......and EVERYTHING corrodes....

yet, i have NO electrical problems.......OK! my Aprilia RSVR eats stators

my bikes are never on a battery tender.....and they all get 5-7years on a stock battery.....
except BMWs they're battery sluts
coming up on 1,400,000 mi on bikes

glad i could help you
__________________
Noel-theknurl

The Forum Curmudgeon
i'm not PC either

ph. 310-414-7247 PST, GMT -8
email, PayPal; theknurl@yahoo.com
Skype; theknurl
theknurl is online now   Reply With Quote
Old 11-13-2012, 12:43 AM   #6
mvrob
Senior Member

MV in the Registry:
[F4 750 SR]

 
mvrob's Avatar
 
Join Date: Dec 2009
Location: australia
Posts: 115
Default

not fixed went for a ride today and the problem has returned.
im going back to my mechanics tomorrow to check the vacuum hoses and clamps.

thanks rob
mvrob is offline   Reply With Quote
Old 11-13-2012, 07:08 AM   #7
CAG
Senior Member


 
CAG's Avatar
 
Join Date: Dec 2006
Location: Home. In Dixie.
Posts: 13,371
Send a message via Skype™ to CAG
Default

Check the sensor in your left air tube.

Last edited by CAG : 11-13-2012 at 06:12 PM.
CAG is offline   Reply With Quote
Old 11-13-2012, 09:14 AM   #8
mvrob
Senior Member

MV in the Registry:
[F4 750 SR]

 
mvrob's Avatar
 
Join Date: Dec 2009
Location: australia
Posts: 115
Default

Quote:
Originally Posted by CAG View Post
Check the sensor in you left air tube.

ok thanks carl

rob
mvrob is offline   Reply With Quote
Old 11-14-2012, 09:43 PM   #9
mvrob
Senior Member

MV in the Registry:
[F4 750 SR]

 
mvrob's Avatar
 
Join Date: Dec 2009
Location: australia
Posts: 115
Default

all the clamps were loose this seems to have fixed it running rough but the idle is still rough when it gets hot.
it also slalls occasionally when idling.
tried to check the sensor but the manual does not really tell you how to do it?

i think it's time to take it to an official mv dealer

thanks rob
mvrob is offline   Reply With Quote
Old 11-18-2012, 10:48 PM   #10
mvrob
Senior Member

MV in the Registry:
[F4 750 SR]

 
mvrob's Avatar
 
Join Date: Dec 2009
Location: australia
Posts: 115
Default

still idling rough i'm going to the mv dealer thursday will get them to check the airtube sensor and the coils is there anything else it could be?

thanks rob
mvrob is offline   Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is On
Forum Jump


Powered by vBulletin. Copyright 2000-2010 Jelsoft Enterprises Limited.