.040 over bore What size engine now?

[cnl83]

Im sure this seems naive but I bored my cylinder .040. What size is my
engine now?


What is the bore size on a 440 or 416?

[hornetgod13]

86mm (406cc)

[glamiskid395]

what would a .020 over bore be? just curious because that was my old 400 after it blew the head gasket

not tryin to steal the thread.

[cnl83]

Originally posted by glamiskid395
what would a .020 over bore be? just curious because that was my old 400 after it blew the head gasket

not tryin to steal the thread.
Were you drag racing when you blew the head gasket?

[Ruby Soho]

makes it a 406cc

[cnl83]

Originally posted by Ruby Soho
makes it a 406cc
.040 = 416
.020 = 406 ?

How are yall doing the math?

[Leadfootracing1]

Here is the measurements on bore vs. displacement:
Stock 397cc (85mm)
+1mm 406cc (86mm)
+2mm 415cc (87mm)
+3mm 426cc (88mm)
+3.5mm 430cc (88.5mm)
+4mm 435cc (89mm)

Hope this helps!!!!

[GPracer2500]

And one inch = 25.4mm. So .040" x 25.4 = 1mm oversized.

[glamiskid395]

Originally posted by cnl83
Were you drag racing when you blew the head gasket?

nope the whole engine in that bike was a defect and honda wouldnt accept it. it blew the head gasket 3 times and each time 2nd gear was destroyed too! so the third time we cleaned the engine up and traded it in for a new 2004 EX in 2005 without fixing it.

[cnl83]

Originally posted by glamiskid395
nope the whole engine in that bike was a defect and honda wouldnt accept it. it blew the head gasket 3 times and each time 2nd gear was destroyed too! so the third time we cleaned the engine up and traded it in for a new 2004 EX in 2005 without fixing it.

What year was yours, and what was the defect? Thats the first time I hear anything like that about a 400ex