CS175 burning oil. Thoughts please everyone? - MVAgusta.net
 2Likes
  • 2 Post By GTW36
  • 2 Post By Mondello175
 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 11-15-2017, 01:54 PM Thread Starter
New Member
 
Mondello175's Avatar
 
Join Date: Sep 2017
Location: UK
Posts: 43
CS175 burning oil. Thoughts please everyone?

I've now removed the cylinder head from my CS57 to investigate where the blue smoke is coming from. It got so bad that after a fairly long downhill I stopped at a roundabout and got overtaken by a blue cloud - embarrassing!
I've only had the bike a few months and it's the first look inside for me.
Anyway, I have my own thoughts on the problem but would like to know what others think, based on the photos.
So, thoughts please everyone?
And suggestions on how to resolve.
Attached Images
         

Last edited by Mondello175; 11-15-2017 at 01:59 PM.
Mondello175 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 11-15-2017, 02:01 PM
Established Member
 
GTW36's Avatar
 
Join Date: Sep 2006
Location: FRANCE
Posts: 178
Look at the exhaust valve guide, an excessive play between valve stem and valve guide will cause a "nice blue cloud of smoke".

You can look also the rings gap and if there is a step at the upper part of the bore (sign of a worn cylinder bore.
Mondello175 and Mondello175 like this.

The difference between a man and a child is the price of his toys

Last edited by GTW36; 11-15-2017 at 02:03 PM.
GTW36 is offline  
post #3 of 6 (permalink) Old 11-17-2017, 01:55 AM
Established Member
 
Join Date: Mar 2016
Location: NL
Posts: 144
New Site Garage
Running downhill with closed throttle creates a vacuum in your combustion chambers.

This will make the oil sucked into your combustion chaimber if:

a] Poor valve seals.
b] Worn or broken piston rings.
c] Piston rings stuck in their grooves.
d] Excessive wear on the cilinder.

You could try to put some fluid on top of the piston and see if it leaks away for a quick check. But the proper way would be to measure wear with a micrometer and compare it to the factory specification.
I think you have to pull the cilinders for a proper diagnose!

XJ750SECA --> RD350LC YPVS --> CBX1000F --> CBX550F2 --> RD350RR --> RD500YPVS --> FZ400R --> F3675 --> 899PANIGALE --> 959Panigale
RCEE is offline  
Sponsored Links
Advertisement
 
post #4 of 6 (permalink) Old 11-19-2017, 04:14 PM Thread Starter
New Member
 
Mondello175's Avatar
 
Join Date: Sep 2017
Location: UK
Posts: 43
and here's what I think

Thanks to GTW36 and RCEE for your suggestions.

I'm fairly sure the root cause is oil leakage down the valve guides but not because they are excessively worn - see my blog for more details and the solution I intend to implement.

https://cyclemasterron.wordpress.com...ce-of-smoking/

Last edited by Mondello175; 11-19-2017 at 04:31 PM.
Mondello175 is offline  
post #5 of 6 (permalink) Old 12-06-2017, 07:22 PM
Senior Member
 
Join Date: Jul 2009
Posts: 275
Don't forget you can get reusable copper head gaskets from Copper Gaskets Unlimited. They are my pattern but Ronnie will sell you one. Make sure you get the "CSS" one with the larger stud holes. Hope it helps!


1954 MV 175 CSS Super Sport
1957 MV 175 CS Modello Sport
1967 Motobi 125 Sport
1974 Ducati 750 GT
Left Coast USA
hulagun is offline  
post #6 of 6 (permalink) Old 12-07-2017, 06:00 AM
Old Wing Nut
 
esq'z me's Avatar
 
Join Date: Aug 2007
Location: Marietta, GA
Posts: 18,274
Send a message via Skype™ to esq'z me
Decel smoke.....valve guide. Your photos confirm. Combustion chamber and spark plug look nice and clean.

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 online now  
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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

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