Looks like I cheered too soon, time to get my hands dirty again.
My headgasket (MLS) is leaking quite a bit on some places around the cylinder head..and I also get some oil leaks from the cam tower studs I think.
But worse, yesterday after driving and experimenting with higher boost levels and checking for detonation my bike blew some oil out of the oil tank breather.
It did the same thing last year during my initial runs when I tried 0.7-1 bar of boost...
.. but now it also breathes a lot through the breather hoses.
Bike starts, runs fine and doesn't smoke... but something went bad, head gasket or worse case piston ring lands..
So time to check out the topend..and also do the frame mod.
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Oh well.. gives me a chance to improve the engine a bit.
The squish band is way off due to the decompression spacer/1.5mm gasket underneath the cylinders. A lot of people do it this way and say it doesnt matter, but I really regretted not cc'ing the head chambers, machining the chambers for low compression and setting quench band to 1-1.25mm after building the engine.
Right now my squish is something like 3mm... not good against detonation at all...moreso promoting it. It might even ping more then at stock compression with decent squish and without the spacer.
My GPZ turbo has the same flat top pistons and more or less the same head chamber, valves and spark plug arrangement, but has from factory a good squish of around 1.25mm. Those bikes are really ping-resistant and I have ran up to 1.5bar / 21psi on that engine(intercooled) on V-power fuel.
Also, I will fit the intercooler as it removes 70% of the heath generated by the hair dryer and make more power at the same time.
The rest of the bike is pretty much finished... everything works, tune is 95% right and chassis is done.. so hopefully its the final hurdle..
