Hello
I pulled out a M4 8mm screw out of the hole in the cylinder head
I thought it would release the dome underneath i think its called, but it doesnt do anything?
Whats the reason for the screw/hole? 🤷♂️
I should have said because you cant see from the pictures is that the hole is threaded for the first 4mm then threaded for the last 4mm then it has a floor, your reply is totaly right about letting air escape etc. No coolant would be able to escape from the hole even with the screw out. I thought it must be to secure the dome but even with the screw out the dome will not budge it seems its all one piece. To be honest i think this particular engine is an older b1 because ive seen those domes unattached from the head and it shouldnt be difficult to remove but this one seems resilient.
Its definitely replica
Where you screw the spark plug in is all one piece its not going to push through. And taking the screw out hasn't released the dome 🤷♂️
You have lots of oxidation locking the o-ring inside....soak the dome in diesel fuel for an hour and with a deadblow hammer hit the sparkplug boss and the dome will release....
probley to bleed air out of the cooling system maybe they failed to get it down into the water jacket those clone engines are known to be extra special...
Ive built a few Blata rep engines for 7-8ft r/c boats and all of the reps I built didn't even have a hole...…..
The dome simply pressed-in as you can see from the picture below..
Judging by the oxidation aswell as rust inside that aluminum-magnesium dome that bike will probably need a whole waterpump rebuild with WP shaft and all.....
Thanks
Your right the previous owner left the coolant in the system. I havnt been able to split the engine to have a look at everything else because the nut on the magneto/pullstart side isnt loosening, do you know if its reversed thread?
They sell stuff for loosening threaded bolts and holes & nuts. Liquid Wrench, etc. If all else fails, you can use a nut splitter, after that get a new nut and clean up the crank threads. The flywheel is on a taper, so its not going to pop off, most have 2 threaded holes and you run 2 bolt thru to the cases and force it off. You can remove the clutch housing and put a socket or..... to hold the crank from turning when you try to take the nut off. I have an air gun and Kawasaki electric wheel nut remover, I keep in my truck/SUV. Make sure its on off and hit it, always works for me.
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