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ok so a few months back i had my motor to start nocking, so i pulled it out and took it to the yamaha shop and asked them to install a hot rods 396cc +7mm stroker kit. a month later got it back and still was not right, so i took it to a real performance shop, to have them replace the cam and port and polish, and some other things, but i got a call from them today saying the stroker is not a +7mm, but a +4mm. so i looked on my box that the kit came in and the box says +7mm(396), so i called hot rods and they said they never made the +7mm kit, but i called around to a few shop to see if i could get some answers and everyone that has this kit in stock is saying they did make the +7mm stroker!!!!!! so what do i do
 

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ok so a few months back i had my motor to start nocking, so i pulled it out and took it to the yamaha shop and asked them to install a hot rods 396cc +7mm stroker kit. a month later got it back and still was not right, so i took it to a real performance shop, to have them replace the cam and port and polish, and some other things, but i got a call from them today saying the stroker is not a +7mm, but a +4mm. so i looked on my box that the kit came in and the box says +7mm(396), so i called hot rods and they said they never made the +7mm kit, but i called around to a few shop to see if i could get some answers and everyone that has this kit in stock is saying they did make the +7mm stroker!!!!!! so what do i do
Believe the manufacturer..............4mm make 379cc
 

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Believe the manufacturer..............4mm make 379cc
+4mm stoke & 84mm bore is 396cc so thats 4 mm gain on the stroke and 1 mm over bore just bought on and its awesome
 
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