It appears that just the cylinder cover over the drive shaft has come lose or broken (come lose from the rear) does the complete assembly need to be replaced? and is it safe to ride until fixed?
SOURCE: Replacing broken drive shaft
the u joints definitely need lubrication and as far as breaking a drive shaft I personally have never seen one break unless someone has been really hammering it or doing a lot of burnouts
SOURCE: firing on rear cylinder not front
I had a similar problem with my Hinda Cb750 after it sat for years. What i had to do was work my way from the battery thru the electrical system cleaning all the connections along the way to the coils This fixed the problem and get me firing on all cylinders. give it a try
SOURCE: Rear brakes not fully releasing
I had an XJ 1100 and had the same problem. after paying someone else two diferent times I found an article talking about the very problem, (wish I could tell you where it is but) what it said was this system was prone to moisture getting in the rear master cylinder. I took the cylider apart and carfully cleaned all the brown residue out of all the small areas and orfices. then with a large suction/pressure pump bought at NAPA I forced good quality dot 4 fluid through the lines untill all the fluid came out clear (better buy 2 quarts this may take several flushings. then disasemble and clean the wheel cylinder as carefully as you did the master cylinder. This solved the problem on my 82 XJ 1100, the article said the trick was that if you live in a climate where weather chages with the seasons changing the fluid each riding season should prevent this from clogging again. Hope this helps, mine worked great afterwords.
SOURCE: i just purchased a 2003 yamaha 1100 vstar with
if it is still firing on the same cly then clean the carbs they tend to gum up after sitting
SOURCE: oil leak from small round cover held in place by 2
sounds like a tappet cover, it will have a "o" ring seal.
This is a very simple repair, purchase a new seal from yamaha, remove the two screws and replace seal, make sure everything is clean when you reassemble. you dont need to overtighten the screws to much
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