Blue smoke RH side when starting

Could it be from wetsump situation at start up, then dissipates once excess sump oil returns to tank?
 
frank73x89 said:
RH4 head? Some of those were known to have cracking/porous casting...
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Yes, it's RH4 and the casting is porous. Yesterday I blocked the oil return holes and filled the rocker houses up to top of the guides with diesel to see if there are any leakage into the ports. No sign of leakage to day. Maybe it is different when the head is hot. If the cause is porous casting, it is a pore that has started leaking this year. Previously, the problem did not exist.
 
Tornado said:
Could it be from wetsump situation at start up, then dissipates once excess sump oil returns to tank?
Click to expand...
To wet sump the bike has to stand still for at least a week or two. The blue smoke occurs after staying the over night.
 
Per said:
To wet sump the bike has to stand still for at least a week or two. The blue smoke occurs after staying the over night.
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Not necessarily true...depends on the bike and oil pump/pressure relief valve condition. Easy to check how much is in sump after sitting vs right at shutdown.
 
Per said:
I haven't been able to pinpoint the fault with certainty. However, the cylinder head is very porous, so I bought and installed a new one, and the problem is gone. The new head was supplied by TGA/Molnar Precision Ltd.
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Congrats on fixing the issue. I guess you bought a “Fullauto” head?

Interestingly, it looks as though they will be manufactured in the U.K. In future.

Quote from the TGA/Molnar website…

WE ARE IN THE PROCESS OF MOVING PRODUCTION TO OUR FACILITY HERE IN THE UK. THIS INVOLVES CHANGES TO PATTERNWORK, FIXTURES, PROGRAMS ETC SO WE DO NOT EXPECT TO HAVE NEW STOCK AVAILABLE UNTIL EARLY 2027
 

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