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Discussion Starter #1
2005 trx 450r oem crank 480 cylinder with 13:1, 42mm taper bored fcr,stock intake no lid, racers edge epoxy port plus 1 valves, stage 3 hotcam and monster shorty big bore exhaust. The other build is a 2005 trx450r (511cc) oem crank Carrillo rod stroked 4.2mm. With 480 cylinder 13:1,42mm taper bored fcr, stock intake no lid, racers edge epoxy port with plus 1 valves, hotcam stage 3 and monster shorty big bore exhaust.
 

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For the 480 Build... I wanna guess 55 to 58 in HP

For the 511 Build... I'm gonna take a wild guess and say 65 to 68 HP



For some comparison for fun Mine Was making 48HP and 35ftlbs or Torque when I was running it with a 10:5.1 Vertex Piston, Epoxy Ported head, Stage 3 Cam, 41mm FCR Carb, Rossier Exhaust, OEM Valves, Kibble White Springs with 91 Pump Gas

My newest set up is now all the same just replaced the Vertex piston with a 13:5.1 CP piston with .030" decked off the Head now my compression ratio is 13:75.1 and now I'm making 54HP and 39ftlbs of Torque, that was on 110 VP

Mine I know would make way more HP if I were to let Racers Edge do the work, but I had fun seeing what I my self am capable of, so that's the only reason I did my own work.


It would be cool if John had a "Dummy Quad" to toss engines in with a dedicated Dyno Sheet sent back to the customer for each engine they build though... But I know they have really fast turn around time and tons of engines that they build so they don't wanna waste any time.
 

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2005 trx 450r oem crank 480 cylinder with 13:1, 42mm taper bored fcr,stock intake no lid, racers edge epoxy port plus 1 valves, stage 3 hotcam and monster shorty big bore exhaust. The other build is a 2005 trx450r (511cc) oem crank Carrillo rod stroked 4.2mm. With 480 cylinder 13:1,42mm taper bored fcr, stock intake no lid, racers edge epoxy port with plus 1 valves, hotcam stage 3 and monster shorty big bore exhaust.
I know this is an old thread but if you see this I hope you respond. On the 511 build how did you go about the build? Stroke the stock crank and replace the rod with the pin rebushed to 19mm and use a crf piston? Or was it a kit with a custom piston? If it was a crf did you deck the head to get the static compression back up to its advertised ratio?
Both builds could use more intake and carb size but I bet the bottom end on the 511 is fun to ride
 

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I’m not sure if he’ll respond, but it’s almost certainly a stroked stock crank, with a bushed rod and CRF piston. It is necessary to deck the head to bring compression back up. The 4.2 stroker is a fun motor.
 

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Discussion Starter #6
I know this is an old thread but if you see this I hope you respond. On the 511 build how did you go about the build? Stroke the stock crank and replace the rod with the pin rebushed to 19mm and use a crf piston? Or was it a kit with a custom piston? If it was a crf did you deck the head to get the static compression back up to its advertised ratio?
Both builds could use more intake and carb size but I bet the bottom end on the 511 is fun to ride
To be honest I never built the 511 I decided to just go with the 480. I was just trying to see how much H.P. the 511 would make over the 480. But If I did build the 511 I was definitely going to use a stroked oem crank with a crf piston or a 2006 or newer trx 450r piston. I was going to buy the complete setup from a certain website. (Not sure if it’s against the rules to mention the website) If it isn’t against the rules I could give you their information.
 

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Making HP ain’t free. . .
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JSD Machine Works? I’ve bought cranks from them but not the 4.2mm stroker. Supposedly their 4.2 doesn’t need to have the cases trenched which should be awesome, because having a stock crank stroked by Crank Works I had to do a lot of clearancing to the cases, and that was after having both the rod mod 1 and 2 done by crankworks.
 
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