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Thread: Whats 300EX Top Speed?

  1. #11
    Join Date
    Aug 2005
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    PA
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    Originally posted by bwamos
    Rev box mod +1000rpm.
    Full System Pipe
    Filter
    No Airbox Lid
    Cam
    11:1 piston
    13/36 Gearing

    (probably don't even need the 11:1 piston)

    I doubt you could hit the rev limit with 15/36 gearing on 22's.

    15/36 gearing w/ 22's & +1000 rpm rev limit = 76mph. Not gonna happen on a stock motor.
    I doubt it too. What do you think riding that would be like? First gear would be almost second maybe between second and third. Do you know the ratios off hand before and after? I think it would be interesting to see how much get up and go you would lose. I think it may work though because when me and my freinds are messing around racing I do second gear starts. The only downfall would be tight trail riding. Also do you know the speed of 14/36 gearing with both 22's and 20's. What equation are you using to get this, I'd like to experiment (sp?) oops...that got to be a rant.
    Thank you for reading my post.

  2. #12
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    May 2002
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    1,366
    stock 300's no more than 55mph, if you mod it and regear then you can get just about any mph that you want out of it as long as its reasonable. I hit 74-75mph with 18" tires, had tons of motor work to pull the gearing but it can be done, 65mph on a 300ex you will need decent amount of work to get the acc. you want and still have the top end.

  3. #13
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    Originally posted by honda250xrider
    stock 300's no more than 55mph, if you mod it and regear then you can get just about any mph that you want out of it as long as its reasonable. I hit 74-75mph with 18" tires, had tons of motor work to pull the gearing but it can be done, 65mph on a 300ex you will need decent amount of work to get the acc. you want and still have the top end.
    What gearing did you have and what kind of motor work? Right now I have a wiseco 12:1, FMF full system, and a UNI and the stock gearing is just running through the gears then bam your in 5th. I'd like to be able to do 70ish once I get some more engine work done. Also where do you guys buy your sprockets? I've been looking in rocky mountain and denniskirk and all they have is 12, 13, 14 front and 36-39 rear.
    Thank you for reading my post.

  4. #14
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    SPROCKETSPECIALISTS.COM

  5. #15
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    Apr 2005
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    Originally posted by klutchbuster250
    dude trust me a 300 gos 60 at the most give or take 1 or 2 mph, my 06 250 with stock 22 inch tires was clock at 55 on teh rev limiter , and my buddys 300 with 20 inch tires was a lil ahead of me so if it did go 55 i would be right next to him or infront so dont say it does 55 couse it dont
    Sorry but he wasn't running a stock quad. He had non-stock tires and most likley regeared.

    A bone stock 300ex straight off the showroom floor tops out at 55mph +/-.

    Rpm limit, transmission ratio, sprocket ratio, tire diameter limit the 300ex's top speed.

    Mine tops out at 74mph on a long straight (GPS). They can go above 55mph obviously and very easily (up to about 60mph) with a rev limit increase or gearing change. But a bone stock 300ex is mechanically limited to 55mph +/- 1-2 mph.
    Brandon -O||||O-
    1998 Honda TRX300EX (330)

  6. #16
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    Jul 2006
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    cape coral
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    dude i still personally think ur wrong, couse everyone here can say a 250ex go's 53-55 give or take and a 300 pulls away in 5 gear by a decent amount,maybe 5 bike lengths
    ''MKF'''miakwadfathers
    mods:
    pro armor v cross bumper in black
    tusk nerf bars
    uni filter
    20 razers on the rear
    22 kenda radial up front
    powermade handgards
    hmf full system in black
    rear wheel spaces
    coming soon:
    rev box, shocks

  7. #17
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    Olney, Illinois / Terre Haute, Indiana
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    Originally posted by klutchbuster250
    dude i still personally think ur wrong, couse everyone here can say a 250ex go's 53-55 give or take and a 300 pulls away in 5 gear by a decent amount,maybe 5 bike lengths
    Bwamos is stating facts, and your going off what other people say. Considering the age he has over you and the facts he stated I would have to say he is right.

  8. #18
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    The newest 250ex's will almost keep up with a 300ex stock for stock. They had their rev limit increased in the factory. (06, 07.. maybe 05 not completely sure.)

    Older 250ex's don't quite hit 50mph.

    I can't tell much more about the 250ex.. I am no expert on that quad. But, I do know my 300ex's. ('05 and older. I don't know much about the changes on the newest revision.)
    Brandon -O||||O-
    1998 Honda TRX300EX (330)

  9. #19
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    Originally posted by bwamos
    The newest 250ex's will almost keep up with a 300ex stock for stock. They had their rev limit increased in the factory. (06, 07.. maybe 05 not completely sure.)

    Older 250ex's don't quite hit 50mph.

    I can't tell much more about the 250ex.. I am no expert on that quad. But, I do know my 300ex's. ('05 and older. I don't know much about the changes on the newest revision.)
    Hey bwamos, what are you using to get all these top speeds? I'd like to kind of experiment with different sprocket sizes and tire sizes to see what top speed I will have. Also, I read one time someone said that going 2 up on the front sprocket would then be like having second gear as first. How true is that? Thanks
    Thank you for reading my post.

  10. #20
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    (Max RPM) * (1/ primary reduction) * (1/ 5th gear ratio) * (front sprocket/rear sprocket) * (tire circumference in inches) * (60 minutes/1hour) * (1ft/12in) * (1mile/5280ft) = top speed limited by max rpms.

    Using completely fictional numbers for rpm & primary/5th gear ratios. (I don't have rev limit or trans mission ratios in front of me)

    (7600rpm) * (1/ 3.00) * (1/ 1.00) * (13/38) * (22*3.14) * (60min/1hr) * (1ft/12in) * (1mile/5280ft) = 56.69mph

    Above is bogus as those aren't correct numbers. It's just how I would calculate theoretical top speed.
    Brandon -O||||O-
    1998 Honda TRX300EX (330)

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