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Post by pxguru on Jan 28, 2013 9:31:25 GMT
Good news as it's just the head. This could solve two problems.
If you use some 220 grit paper on your sheet of glass you can take off 1.3mm from the head. Then smooth with 600 grit. Then finish with some 1200 grit paper. This will take a few hours to complete. as Joey said figure 8 motion, plenty of WD40, keep the head level and don't push it too hard.
After you remove 1.3mm from the head you must raise the barrel by the 1.7 mm. After this it will go really well.
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Post by pxguru on Jan 28, 2013 10:26:43 GMT
Check the top of your barrel has not been damaged either. Running with a blowing head on an alloy barrel can sometimes damage the gasket surface of the barrel. If there is some small damage you can try to smooth this on the glass as well.
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modpx
1st Class Ticket
Posts: 87
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Post by modpx on Jan 31, 2013 13:24:52 GMT
well guys i took the head to rebore today, the guy put it on a flat surface and lapped it for a few seconds and went: this is perfectly straight. Where's the "banging head against the wall" emoticon ?? cause i dont know anymore what to try or think..
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modpx
1st Class Ticket
Posts: 87
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Post by modpx on Jan 31, 2013 18:15:13 GMT
maybe i made it, i think it was a loose stud that was giving me problems, after trying over and over again i took one gasket off the base (now it´s approx 0.5) and i put one 0.5 head gasket i tighten the head and i did like suggested i let the motor warm up and i tight it again and at that point i discovered that loose stud. In other words i was intaking air but not cause the cylinder head was bent. Not having a socket for measuring the tightening power i had to proceed more like by trial and error. Im curious to see how the Vespa will work with this set up now, and then if the head will be reliable i will start packing and ill report my impressions! cheers everybody!
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Post by sbwnik on Feb 3, 2013 22:35:36 GMT
Torque wrenches are great, aren't they.
But it's good practice to retighten after a run anyway.
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