Valve / spring failure - DIY!!! - Page 3 - MVAgusta.net
 53Likes
Reply
 
LinkBack Thread Tools Display Modes
post #21 of 90 (permalink) Old 09-08-2018, 08:09 AM
Old Wing Nut
 
esq'z me's Avatar
 
Join Date: Aug 2007
Location: Marietta, GA
Posts: 18,296
Send a message via Skype™ to esq'z me
Quote:
Originally Posted by airjawed View Post
Doing just the intake cam I believe can be done with engine in place and only a little extra work during a major servicing (valve cover removed) when I measure valve clearance.
What are your thoughts?
Replacing the cam with engine in place is the same as doing a valve adjustment. You take the cam out to swap shims...so yes, that will be relatively easy.

I think your theory on the springs and valve guides as likely causes for the original failures are spot on...not the cam lobe ramps.

Thanks for sharing all your information and photos.
airjawed likes this.

I used to be fast....now I just dream about it.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'08 910R (Gina), '04 F4 SPR #275 Track Bike (Lola), YSR50 (The Rabbit), '71 CB100 (Lil' Red), '75 RD350C (Orange Bird) restoration project, '70 Suzuki F50 (Baby Blue)
esq'z me is offline  
Sponsored Links
Advertisement
 
post #22 of 90 (permalink) Old 09-08-2018, 07:45 PM Thread Starter
Senior Member
 
airjawed's Avatar
 
Join Date: Apr 2017
Location: Memphis
Posts: 564
New Site Garage
My theory is the power and rideability part.



The information regarding what is central to failure comes from the trusted source doing the work. I would agree that a lobe with less lift would be less stressful to the springs. The information I've received is that the cam profile, spring and guides can all be improved (and were) in the newest F3 800. His advice was to get the revised cam as that would greatly improve the reliability in my street application as that worked in the race world as well.


I wish I had the budget to do all the things I wanted in the bike world. I'd make this a track oriented bike and have a lot of fun making it with top spec hardware but I have reality to deal with. So, in the meantime I appreciate that this thread might be helpful or at the least interesting!!



Quote:
Originally Posted by esq'z me View Post
Replacing the cam with engine in place is the same as doing a valve adjustment. You take the cam out to swap shims...so yes, that will be relatively easy.

I think your theory on the springs and valve guides as likely causes for the original failures are spot on...not the cam lobe ramps.

Thanks for sharing all your information and photos.
cherche likes this.

2014 MV Agusta F3 800 ABS
airjawed is offline  
The Following User Says Thank You to airjawed For This Useful Post:
post #23 of 90 (permalink) Old 09-09-2018, 03:49 AM
New Member
 
Moriwaki's Avatar
 
Join Date: Jan 2016
Location: Netherlands
Posts: 48
New Site Garage
Thanks a lot for sharing this story!
Glad to see there are options for repair when it drops a valve...

2013 F3 800 (track only)

The older you get, the faster you was
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Moriwaki is offline  
Sponsored Links
Advertisement
 
post #24 of 90 (permalink) Old 09-09-2018, 07:59 AM
Established Member
 
Mario21's Avatar
 
Join Date: Sep 2018
Location: Poland
Posts: 99
I have same issue with B3 675 MY2013. In my case air box looks like a part of grinding machine. One intake valve completely damaged second as well, piston drop down and piston rod went outside from crank case. Good I’m still alive as it happen at speed 190km/h. I heard that there is some company in Italy which makes heads for racing and fixing valve issue at F3 engines. But after 2 days of net searching nothing found yet.

Last edited by Mario21; 09-09-2018 at 09:06 AM. Reason: Mistake in MY
Mario21 is offline  
post #25 of 90 (permalink) Old 09-09-2018, 08:20 AM
Senior Member
 
silentservice703's Avatar
 
Join Date: Feb 2008
Location: Duxbury, MA, USA
Posts: 21,019
Send a message via Skype™ to silentservice703
@Mario21: You can use the EDIT button at the bottom of your post to go back and change information found to be erroneous.

Gapalicious 2019 at
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
from OCTOBER 2-6, 2019

Call (423) 519-2000 or (423) 253-6213 to reserve your Riverfront Cabin. PM me for The Crow's Nest reservation!!!

Email/Paypal:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


My personal Cell Phone: (781) 223-3020


'07 F4 312R, '10 B4 1090RR, '15 B3 800RR
'07 Ducati Monster S4Rs, '07 Ducati Monster 695
2010 Harley Davidson Ultra-Classic Electra-glide CVO FLHTCUSEBLK
'63 Honda C100A Cub
'61 MVA TRA 125
silentservice703 is offline  
post #26 of 90 (permalink) Old 09-09-2018, 07:55 PM
Established Member
 
Join Date: Apr 2018
Location: Minneapolis MN
Posts: 85
So won’t changing the cam require a re map of the ECU? Or will th you bike be smart enough to notice and adjust for it?
Strider78rr is offline  
post #27 of 90 (permalink) Old 09-09-2018, 09:56 PM Thread Starter
Senior Member
 
airjawed's Avatar
 
Join Date: Apr 2017
Location: Memphis
Posts: 564
New Site Garage
The information that I have is that remap is not mandatory. But I do believe that a remap/dyno tune would optimize the fueling. It is likely similar to installing a slip-on exhaust. Most bikes don't require a remap for that little of a change but if you have the resources to do it then it should be done.


My bike actually kept running with a dropped valve. It didn't even trigger a code on my dash! I'm sure deeper analysis of the fueling and trims would show a problem but it was not enough to trigger a warning of any sort.


I could always try a map from a newer model if it did indeed present a fueling issue.



Quote:
Originally Posted by Strider78rr View Post
So won’t changing the cam require a re map of the ECU? Or will th you bike be smart enough to notice and adjust for it?

2014 MV Agusta F3 800 ABS
airjawed is offline  
post #28 of 90 (permalink) Old 09-09-2018, 10:02 PM
Established Member
 
Join Date: Apr 2018
Location: Minneapolis MN
Posts: 85
I still haven't gotten my F3 yet but all this dropped valve talk has me shaking in my boots....
Strider78rr is offline  
post #29 of 90 (permalink) Old 09-10-2018, 05:37 AM
Old Wing Nut
 
esq'z me's Avatar
 
Join Date: Aug 2007
Location: Marietta, GA
Posts: 18,296
Send a message via Skype™ to esq'z me
Quote:
Originally Posted by Strider78rr View Post
I still haven't gotten my F3 yet but all this dropped valve talk has me shaking in my boots....
The dropped valves were mostly a first edition problem with the 675 cc bikes. And 100% of the bikes were not affected. A fair number, but not every one.

What year and model are you getting? Regardless, I would not let this concern deter you or keep you awake at nights.
Strider78rr likes this.

I used to be fast....now I just dream about it.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'08 910R (Gina), '04 F4 SPR #275 Track Bike (Lola), YSR50 (The Rabbit), '71 CB100 (Lil' Red), '75 RD350C (Orange Bird) restoration project, '70 Suzuki F50 (Baby Blue)
esq'z me is offline  
post #30 of 90 (permalink) Old 09-10-2018, 07:51 AM
Established Member
 
Join Date: Apr 2018
Location: Minneapolis MN
Posts: 85
‘14 f3 800.
Strider78rr is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to use all of the features of the MVAgusta.net site, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome