fireman_343 Posted January 29, 2008 Report Share Posted January 29, 2008 I'm wanting to know if you can convert piston bore size (lets say 45mm) to a a CC number. I'm wanting to know what cc my bike would be if I bore it out a bit. Anyone know the number... by the way this is for my 2 stroke NSR50 with a big bore kit getting some motor work done to it! Quote Link to comment Share on other sites More sharing options...
Chrome Posted January 29, 2008 Report Share Posted January 29, 2008 Answer from flounder in 3.......2.......1....... Quote Link to comment Share on other sites More sharing options...
Dweezel Posted January 29, 2008 Report Share Posted January 29, 2008 10mm to a cm, so the bore would be 4.5cm, the (r x r x Pi) x stroke x # of cyl = CC Quote Link to comment Share on other sites More sharing options...
flounder Posted January 29, 2008 Report Share Posted January 29, 2008 Read these. thanks crome.. I found these one time while tearing apart my dirtbike engine.http://www.circletrack.com/techarticles/ctrp_0505_calculating_engine_compression/index.htmlhttp://albertstreetmiddle.nbed.nb.ca/gr_projects/small_gas_engines/Engine%20Displacement/Calculation.htm Quote Link to comment Share on other sites More sharing options...
Chrome Posted January 29, 2008 Report Share Posted January 29, 2008 i knew you wouldnt let me down. lol Quote Link to comment Share on other sites More sharing options...
Casper Posted January 29, 2008 Report Share Posted January 29, 2008 10mm to a cm, so the bore would be 4.5cm, the (r x r x Pi) x stroke x # of cyl = CC2.25^2 = 5.0625 5.0625 x 3.14 = 15.89625stock stroke is 41.4mm = 4.14cm15.89625 x 4.14 = 65.8104751cylSo 65.8CC Quote Link to comment Share on other sites More sharing options...
fireman_343 Posted January 29, 2008 Author Report Share Posted January 29, 2008 That sucks.. no more overbores for me.. or I'll be running a cheater bikeThanks guys for the formula's.... Quote Link to comment Share on other sites More sharing options...
Chrome Posted January 29, 2008 Report Share Posted January 29, 2008 if you kept winning, would they break down your bike and check it out? Quote Link to comment Share on other sites More sharing options...
Dweezel Posted January 29, 2008 Report Share Posted January 29, 2008 wait... Your racing a 65cc bike? Quote Link to comment Share on other sites More sharing options...
fireman_343 Posted January 29, 2008 Author Report Share Posted January 29, 2008 Chrome, I win anyway so no need for them to brake down my bike this year. Our rules state no more then 65cc for F2.. so I'll be legal! Dweezel,Yeah I race a Honda NSR50 with a Kitaco 63cc big bore kit, worked cylinder and head, aftermarket exhaust, ect... A lot of fun and cheaper then racing my R6!!! Quote Link to comment Share on other sites More sharing options...
Chrome Posted January 29, 2008 Report Share Posted January 29, 2008 i figured you would say that you always win after i put that. how fast do these bikes go? Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted January 29, 2008 Report Share Posted January 29, 2008 ahh that looks awesome! how much do used NSR's run? new theyre like 5k right?.. Quote Link to comment Share on other sites More sharing options...
Dweezel Posted January 29, 2008 Report Share Posted January 29, 2008 no shit... How does that thing move? whats the top speed on something that size? Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted January 29, 2008 Report Share Posted January 29, 2008 i had my 110cc pocket bike up to 50 mph (had a speedo) and it wasnt done pulling..so I'd imagine a race-trim bike would move pretty quick too?... Quote Link to comment Share on other sites More sharing options...
fireman_343 Posted January 29, 2008 Author Report Share Posted January 29, 2008 exSRAaron, I sold a used 04 NSR50 (stock) for $1500 a few months ago... I know you can get/find them $2k for new and $1500-1800 used! Look around, find one and let me know... I'll tell ya if it is a good deal or not, and then come out and race with us at Circleville Raceway and at BeaveRun in PA! Dweezel, a stock 04 NSR50 only puts out 7.5hp.. sounds like it isn't alot but these little 2 stroke motors are HRC built and are fast! Slap on a Kitaco 63cc big bore kit, 24mm roundslide carb, aftermarket exhaust and you can get around 12-15hp out of them! They make a 77cc kit for it as well.. then you'll be in the 20hp range!! I would say mine goes around 60MPH with the gearing I've got. I don't really know since I don't have a speedo.. I'm sure I can get more speed out of it if I had taller gearing, but I keep it short to get the most power out of the turns and keep the revs up! Come check us out this season if you are around BeaveRun Pa or Circleville Ohwww.ohioysr.org Quote Link to comment Share on other sites More sharing options...
Angrish Posted January 30, 2008 Report Share Posted January 30, 2008 I've seen them run ..looks like a lot of fun. Quote Link to comment Share on other sites More sharing options...
fireman_343 Posted January 31, 2008 Author Report Share Posted January 31, 2008 Angrish.. when did you see us race?? And yeah it is a ton of fun! I can't wait for this spring! Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted January 31, 2008 Report Share Posted January 31, 2008 how's the build quality of them? i couldnt EVEN imagine draggin' a knee with the crappy mid-bike i used to have, it would've fallen apart lol.. Quote Link to comment Share on other sites More sharing options...
Angrish Posted January 31, 2008 Report Share Posted January 31, 2008 Angrish.. when did you see us race?? And yeah it is a ton of fun! I can't wait for this spring!Last year at the gocart track. Quote Link to comment Share on other sites More sharing options...
fireman_343 Posted January 31, 2008 Author Report Share Posted January 31, 2008 how's the build quality of them? i couldnt EVEN imagine draggin' a knee with the crappy mid-bike i used to have, it would've fallen apart lol..The build quality?? Dude... HRC Honda built these things for one thing... racing!!! They are built great, the suspension is better then my YSR's aftermarket FOX shock.. (fully adjustable front and rear suspension)! I think this NSR helps me with riding my R6 on the track... it helps with learning how to keep your corner speed up! A lot of 600 racers out there will just let the bikes power make up for their mistakes or lack of corner speed... this WILL teach ya that corner speed is the key to winning races and staying up front! Here is a 8min video of us racing at BeaveRun... I came from starting out in 5th to pass my teammate Dave and come in 2nd... the kid in 1st place is on a 88cc 2 stroke bike, Dave and I are both on NSR's with 63cc kits! It is a funny video as my wife and Dave's both talk a little smack! And a few shots of it under the tank... And this is what it looks like now in my basement, waiting for my motor parts to come in.. . Quote Link to comment Share on other sites More sharing options...
Just2EZ05 Posted January 31, 2008 Report Share Posted January 31, 2008 hey that looks like a ton of fun Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted January 31, 2008 Report Share Posted January 31, 2008 God that looks awesome! Quote Link to comment Share on other sites More sharing options...
fireman_343 Posted January 31, 2008 Author Report Share Posted January 31, 2008 Grab your leathers and come out and join us! We'll have the 08 schedule this Saturday! Quote Link to comment Share on other sites More sharing options...
serpentracer Posted February 1, 2008 Report Share Posted February 1, 2008 damn dude that does look kick ass! I never would have never thought they could get up and go that good. Quote Link to comment Share on other sites More sharing options...
fireman_343 Posted February 1, 2008 Author Report Share Posted February 1, 2008 That is what everyone says... and I said the same thing before I went out and rode one on the track. All it took was a few laps and I was hooked! Come out sometime, bring your leathers and we can get ya on the track and turn a few laps for free... just to see if you like it! Quote Link to comment Share on other sites More sharing options...
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