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Post by tomitch on Aug 2, 2009 13:00:48 GMT 1
put autisa kit on my 125lc with dt175 piston in i took 2 mm of the bottom of the barrel and got a bit keen and took 1.5 mm of the top and had to use a 2mm copper head gasket to make up the squish to between 1.2mm - 1.3mm i took it out for a spin and it was lovely to ride until 7k rpm and it started pinking.
The problem iv got is there isnt enough volume my head measures 14cc volume to the top of the sparkplug hole and on a flat surface it measures 16cc.
could someone please tell me the standard volume of the head on a std 125lc mk2/1 so i can work out the difference im running 68mm bore now so its last chance for me,
Tom
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Post by twostroker on Aug 2, 2009 13:55:52 GMT 1
put autisa kit on my 125lc with dt175 piston in i took 2 mm of the bottom of the barrel and got a bit keen and took 1.5 mm of the top and had to use a 2mm copper head gasket to make up the squish to between 1.2mm - 1.3mm i took it out for a spin and it was lovely to ride until 7k rpm and it started pinking. The problem iv got is there isnt enough volume my head measures 14cc volume to the top of the sparkplug hole and on a flat surface it measures 16cc. could someone please tell me the standard volume of the head on a std 125lc mk2/1 so i can work out the difference im running 68mm bore now so its last chance for me, Tom in my opinion there is one man who i KNOWS exactly what to do and he is mr fahron,he did a great job of mine and from what i can remember mine didnt have either the head or barrel skimmed but mine was a gen yam barrel and not a autisia,as for being 2mm o/s i wouldnt worry because bigger pistons can be sourced,i think his number is on the home page of here failing that norbo of jazz probaly know his number |
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Post by tomitch on Aug 2, 2009 14:20:37 GMT 1
haha dont worry guys iv sorted it with a bit of head scratching my barrell + head 181.5cc (bdc volume) / 14cc (tdc volume) = 12.9 std rd125lc 123cc (bdc volume) /  (tdc volume) =6.4 19 i kept putting numbers in place of to try and find the correct volume of a 125lc, as far as i can tell a std 125lc has a tdc volume of 19cc is this correct ? then 19(std 125lc tdc volume) / 123cc (std 125lc bdc volume) = 0.1544 0.1544 * 181.5(autisa 181.5cc bdc volume) = 28cc what i think should be my correct tdc volume..........i stand to be corrected ? |
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Post by tomitch on Aug 3, 2009 13:28:17 GMT 1
lol all the above is total bollox the equation i found was for working out 4-stroke head volume. ooops
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(tdc volume) =6.4