Investigating that blue smoke

[racerrad8]

What set up do you have for crankcase ventilation and is it in good nick, as in not kinked or blocked.

Have pods on the bike Noel and the crank vent is the standard hose and filter.

Richard,

Just confirming, there is no obstruction in the crankcase ventilation system that could cause that oil to run up past the piston rings?

If there is, you should also be concerned about all of the oil seals of the crankcase being over pressured and causing leaks as well.

Randy - RPM

[roverfj1200]

There are no scores in the cylinders and I don't think riding it more will hurt.

Be careful...

If the piston ring land is broken, then there is a possibility it can break apart, gouge the cylinder or create additional piston friction. If any of these start happening and it overloads the rod bearing it could knock it out. That would result in a damaged crankshaft, connecting rod issues or worst case scenario the rod hanging out of the block.

You had the head off twice now...

If you would have removed the single 12mm nut at the front of the cylinder and lifted the barrels you would know the cause.

Buddy, tear that thing down, especially if essentially the head has now been off three time with the previous owner already having the original head rebuilt.

I bet you can have it apart in less than 30 minutes.

Randy - RPM

One of the problems I have is no clean area to work in. All my repairs are done in a carport area. If the wind picks up and I have a engine open it will fill with dust. Julie takes a dim view of engine work being done on the kitchen table...  

And yes I can have the head off and on in a few hours.

Main plan now is: I have a second barrel here that I could have bored for some wiseco pistons but I don't think the bike fund has enough cash in it yet.

The second barrel and pistons are high mileage but on first inspection seem to still be in spec. If I open the motor these could be used as a temp solution.  (will get them measured at a shop)

While it is hard to be sure ( and I am no mechanic ) I seem to think it is most likely to be stuck oil rings that seal again as the piston expands.

The next few weekends will see me doing other hobbies so this will continue to be a slow moving project.

[racerrad8]

One of the problems I have is no clean area to work in. All my repairs are done in a carport area. If the wind picks up and I have a engine open it will fill with dust. Julie takes a dim view of engine work being done on the kitchen table...  

Just do it and ask for forgiveness later...

Randy - RPM

[roverfj1200]

One of the problems I have is no clean area to work in. All my repairs are done in a carport area. If the wind picks up and I have a engine open it will fill with dust. Julie takes a dim view of engine work being done on the kitchen table...  

Just do it and ask for forgiveness later...

Randy - RPM

Want need bikes if I try it..... 

[roverfj1200]

As some know I fitted a low km 93 engine to my 88 that have very high km on it. While the engine ran fine it would smoke heavily until it warmed up. Today was the strip down. Thought I would video it.

https://youtu.be/H5gN8R3d2xk

[Old Rider]

God video sad to see the bent rod.My guess is that you got a stuck float on the carb feeding nr2 cylinder and mayby a kink in the overflow hose  so that fuel
seeped into the sylinder causing it to hydrolock .It is very little fuel reqired to hydrolock a cylinder .Mayby the choke has stayed on also.
God luck with the repair check the  runout of the crank.

[FJ1200W]

Great video, thanks for posting that.

I have a extra set of rods if needed.

[fj1289]

One of the problems I have is no clean area to work in. All my repairs are done in a carport area. If the wind picks up and I have a engine open it will fill with dust. Julie takes a dim view of engine work being done on the kitchen table...  

Just do it and ask for forgiveness later...

Randy - RPM

Want need bikes if I try it..... 

I've always said if you don't hear from me for a good while, tell the authorities I probably ran another oil pan or engine case or something through the dishwasher - they can probably find me finely ground in the septic (we have a crazy powerful garbage disposal...)

[Pat Conlon]

Spousal homicide...  me it's the boss's oven....set on 450, heat curing the VHT header paint....pwhew....
Even with the stove hood vent on high, that smell went thru the entire house....and lingered.

[roverfj1200]

After replacing all the con rods I gave the barrels a light scratch and reassembled the engine. After a few hot and cold soft runs I headed out for a few short easy rides to slowly bed the rings in. Today, now that some of our virus restrictions have been eased, I took the bike out for a longer run. All seems will. May do a longer ride tomorrow.