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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc. |
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#1
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stroker rods.
Since we can use some select honda rods has anyone ever bothered to see how much of a stoker rod we can use before trenching +2 +4? any ideas?
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#2
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You are actually talking about the crankshaft stroke not the rod.
You can also use a custom rod with a smaller dia big end so you donr have to trench the cases. A 2mm stroker only moves the rod end 1mm out on the crankshaft.
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2011 Gas Gas 300 Six days. 2006 Honda CR 500AF. |
#3
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So do any of the trx250 or cr250 cranks fit in?
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#4
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I dont know but doubt it.
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2011 Gas Gas 300 Six days. 2006 Honda CR 500AF. |
#5
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Cranks are not interchangable, rod kit is same as Honda CR250 thats all.
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#6
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You can buy cr250 rods that are 4mm and 6mm longer eye to eye on the rod.
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#7
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You could put in a longer rod if you made up an appropriate spacer to raise the cylinder up however much longer the rod is over stock, however I cant think of an advantage of doing that, other than to change port timing??
The rod length doesnt determine stroke length, the crank offset does. So a longer rod with the same crank doesnt increase capacity, it just moves it to a different portion of the cylinder. |
#8
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I guess i figured it would add case volume
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#9
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Most of the time a smaller case volume is better. It builds more preasure to push the fuel and air up the transfers.
But a long rod makes a smoother powerband and a short rod makes a snappy powerband. But a short rod side loads the piston much worse. It also raises the piston speed.
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2011 Gas Gas 300 Six days. 2006 Honda CR 500AF. |
#10
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Long rod gives a mechanical advantage. Early 90's YZ 250 kit was a winner, but they liked the drop in negative(case) compression.
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