freddy Posted January 5, 2009 Report Share Posted January 5, 2009 can i replace the connecting rods on my stock crankshaft with +5 connecting rods and make it a stroker crankshaft?? thanks guys Quote Link to comment Share on other sites More sharing options...
als660r Posted January 5, 2009 Report Share Posted January 5, 2009 no a longer rod does not mean longer stock . longer rod mean the crank will not turn unlees you change piston wrist pin height Quote Link to comment Share on other sites More sharing options...
freddy Posted January 5, 2009 Author Report Share Posted January 5, 2009 no a longer rod does not mean longer stock . longer rod mean the crank will not turn unlees you change piston wrist pin height so if i change my connecting rods and pistons with the +5 hot rod, would it work?? Quote Link to comment Share on other sites More sharing options...
vulvafan537240 Posted January 5, 2009 Report Share Posted January 5, 2009 no. the long rod's only function is to put less side load with the piston on the sleeve, making the engine more reliable. long rods are 5mm longer and are used with the wiseco 795 series pistons. you must buy a stroker crank to increase the stroke. if youre going with a 4mill stroker, you might as well get the long rod. cost is the same and it adds life to the engine. Quote Link to comment Share on other sites More sharing options...
killshee Posted January 5, 2009 Report Share Posted January 5, 2009 no dude it will just move the stroke of the piston higher.... not make it longer Quote Link to comment Share on other sites More sharing options...
klemet banshee Posted January 5, 2009 Report Share Posted January 5, 2009 sorry to hijack but i have a similar post if i get the long rods do i need to change my port? Quote Link to comment Share on other sites More sharing options...
blowit Posted January 5, 2009 Report Share Posted January 5, 2009 so if i change my connecting rods and pistons with the +5 hot rod, would it work?? That setup is considered a "long rod" crank. A very common setup but usually coupled with a +4mm stroke as well. The long rod decreases rod angle for increased rpm ability and reliability but when combined with the +4mm stroke, puts you back to near stock specs. We have little doubt if Yamaha ever once ran the YFZ350 engine through R&D after it's debut in 1987, they would have added a similar setup. The LR, +4mm strokers run very nice. Brandon Quote Link to comment Share on other sites More sharing options...
tonyown Posted January 5, 2009 Report Share Posted January 5, 2009 No... when u use a long rod crank you put wiseco 795 series who moves the piston 5mm lower so it doesnt change anything but the side load as volfan537240 said... if u change for a 4mm stroker yes you'll have to change your port Quote Link to comment Share on other sites More sharing options...
blowit Posted January 5, 2009 Report Share Posted January 5, 2009 No... when u use a long rod crank you put wiseco 795 series who moves the piston 5mm lower so it doesnt change anything but the side load as volfan537240 said... if u change for a 4mm stroker yes you'll have to change your port Technically, yes but delta between the two will be very minimal. Because you are changing effective rod angles, it will change the port timing some what but not really enough to notice. This has zero bearing on what the measured timing height is at TDC realizing that by adding 795 pistons and a +4.92mm rod comes out the same at TDC. Brandon Quote Link to comment Share on other sites More sharing options...
tonyown Posted January 5, 2009 Report Share Posted January 5, 2009 thank you for the precision :thumbsup: Quote Link to comment Share on other sites More sharing options...
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