76R75/6 - BMW Luxury Touring Community
 1Likes
  • 1 Post By McWideglide
 
LinkBack Thread Tools Display Modes
post #1 of 4 Old Apr 24th, 2020, 4:24 pm Thread Starter
Junior Member
 
Join Date: Apr 2020
Posts: 2
76R75/6

I have an R75/6 that starts up every time, doesn’t smoke, doesn’t use oil, but has only 80psi in each cylinder. Does have 74K on clock. Just use it locally. What could be wrong, valves?
Robool is offline  
Sponsored Links
Advertisement
 
post #2 of 4 Old Apr 25th, 2020, 8:03 am
Lifetime Supporter
 
Patric's Avatar
 
Join Date: Feb 2004
Location: Zephyrhills, Florida USA
Posts: 1,474
Re: 76R75/6

Could be the valves.. The bikes from back then don't do well with today's gas. I had a /6 & a /7 from that time , & ended up changing the valves & seats.

Did you set the valves before the compression test?

You might want to re-torque the heads , set the valves every 2,500 miles . The cylinder studs stretch & effects the valve clearances....That is what we did in the old days...

Patric Blackman
2002 K1200LT/Hannigan2+2
2010 R1200GSA ...1987 Helix...
AMA Charter Lifemember
37 Year Member of both BMWMOA & BMWRA

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

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Patric is offline  
post #3 of 4 Old Apr 25th, 2020, 2:18 pm
Lifetime Supporter
 
McWideglide's Avatar
 
Join Date: Apr 2009
Location: San Mateo, Ca, USA
Posts: 335
Re: 76R75/6

try adding a tablespoon of motor oil to each cylinder via spark plug hole, crank for a few seconds then try your compression . If it goes up, likely rings if not, likely valves.
Patric likes this.

McWideglide

Jeff M.
2002 Harley Dyna Wideglide
2016 BMW R1200RT
2009 BMW K1300GT sold
1976 BMW R90/6 sold
1967 BSA 441 Victor sold
McWideglide is offline  
 
post #4 of 4 Old Apr 25th, 2020, 8:43 pm Thread Starter
Junior Member
 
Join Date: Apr 2020
Posts: 2
Re: 76R75/6

THANKS MUCH! Will try both suggestions
Robool is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the BMW Luxury Touring Community forums, 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











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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