justin1987 Posted January 22, 2012 Report Posted January 22, 2012 i bought a banshee that i think has a 4 mil crank in it because the top of the stoke the pistons come out of the cylenders just a little. if this is a 4 mil what would be the easy way to find out? Quote
IGottaPee Posted January 22, 2012 Report Posted January 22, 2012 i bought a banshee that i think has a 4 mil crank in it because the top of the stoke the pistons come out of the cylenders just a little. if this is a 4 mil what would be the easy way to find out? Check the heads, see if they have been re-shaped, if so the previous owner probably did put a +3 or +4 in there. Quote
ticktock Posted January 22, 2012 Report Posted January 22, 2012 Crank rod numbers for a stock crank are 29L. Stamped on rods Adam Quote
Larry's Shee Posted January 25, 2012 Report Posted January 25, 2012 Get a stroke meter. Set the head back on, stick a pencil or something in plug hole, bring it up to TDC, mark pencil, turn it to BDC, mark, measure what you have. Quote
SonOfSand Posted January 25, 2012 Report Posted January 25, 2012 Get a stroke meter. Set the head back on, stick a pencil or something in plug hole, bring it up to TDC, mark pencil, turn it to BDC, mark, measure what you have. How do you find TDC? Quote
camatv Posted January 25, 2012 Report Posted January 25, 2012 install pencil turn motor till pencil stops moving mark pencil turn motor till pencil stops moving again mark pencil remove pencil go get your digital dial calipers 0 them set them to METRIC measure the distance on the marks compare to 54mm this crank is stock compare to 58mm this crank is a +4mm decide which crank you think you may have Quote
Larry's Shee Posted January 25, 2012 Report Posted January 25, 2012 This isn't a precise method but close enough to determine stock or 4mil stroker. Pull stator cover so you can roll it over with flywheel. You want to use a near full length pencil. Put it in plug hole and roll engine over until it stops rising out of hole that's TDC. After marking continue rolling engine over untill it stops dropping. That's BDC, mark that. Distance between marks is length of stroke. Quote
SonOfSand Posted January 25, 2012 Report Posted January 25, 2012 This isn't a precise method but close enough to determine stock or 4mil stroker. Pull stator cover so you can roll it over with flywheel. You want to use a near full length pencil. Put it in plug hole and roll engine over until it stops rising out of hole that's TDC. After marking continue rolling engine over untill it stops dropping. That's BDC, mark that. Distance between marks is length of stroke. Right, I guess I was looking for an exact method, similar to finding TDC on a YFZ 450, but this will work. Thanks. Quote
Larry's Shee Posted January 27, 2012 Report Posted January 27, 2012 More precise would be with a caliper with the depth stick, same method. Didn't say how precise you needed Quote
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