Whats 300EX Top Speed?

[Ghost-Rider]

Might be getting one, just wondered what the top speed is.

Also whats the shift pattern?
5
4
3
2
1
N


~Thanks.

[klutchbuster250]

the shift pattern is 1N2345 and it tops out at like 60 but barly

[Ghost-Rider]

Alright thanks.

Do you have one ? if so how do you like it?

[klutchbuster250]

na i dont got it but one of my best buds does, and his is like a 93 that we started up after sitting for like 3 years and all we did was clean the carb charge the battery and it ran great and i mlying it probly gos a lil more than 60 ifu jet it spot on and stuff there great bikes il take one over my 250ex anyday ,ofcourse il takle any bike over mine right now lol

[honda300EXtreme]

yea mine runs about 65 wide open...

i think a 300ex is a great bike, and responds very well to modifications

[Ghost-Rider]

Alright thanks.

[bwamos]

Bone stock.
Stock CDI, 22" tires, stock gearing (13:38):
the 300ex tops out at 55mph. Almost exactly.

1N2345 is correct.

With some mods, it's very easy to get into the 60-65mph range. But, 55 really is plenty fast for trail & track. Most will regear it to keep it at that top end range and increase the acceleration.

[Blue250X]

Originally posted by bwamos
Bone stock.
Stock CDI, 22" tires, stock gearing (13:38):
the 300ex tops out at 55mph. Almost exactly.

1N2345 is correct.

With some mods, it's very easy to get into the 60-65mph range. But, 55 really is plenty fast for trail & track. Most will regear it to keep it at that top end range and increase the acceleration.

bwamos, what kind of mods are you talking? Rev box, 14 or 15 tooth front sprocket and 36 tooth rear? What do you suppose that would get you? A stock 300 probably wouldn't be able to pull that though.:ermm:

[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. ;)

[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

[Blue250X]

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. :chinese:

[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.

[Blue250X]

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.

[ALEXANDERJASON]

SPROCKETSPECIALISTS.COM

[bwamos]

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.

[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

[300ex_#387]

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.

[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.)

[Blue250X]

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

[bwamos]

(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.

[Blue250X]

Originally posted by bwamos
(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.

alright I'm following so far...after reading it 20 or 30 times, the only thing I'm lost on is the primary reduction. What's that? Also which numbers aren't the correct ones. Sorry for bothering you with these questions...just curios:chinese:

[bwamos]

Max RPM, Primary reduction, and 5th gear were pulled out of thin air.

Primary reduction is the gear reduction going from the crankshaft to the transmission cartridge. Then you have the Tranny gear reduction to the countershaft. Then the last reduction is the sprockets on the chain drive.

The primary reduction is a fixed value.
Tranny reduction varies with 1st-5th and Reverse.
The chain drive reduction is fixed unless you swap out sprockets.

Sometimes you'll hear the term "final drive ratio". That can be one of 2 things. It's usually the primary reduction & transmission gear reductions combined at each gear giving you the total reduction from the crankshaft through the countershaft.

Sometimes people include the chain drive reduction. But since that's an "adjustment point", I prefer to leave that out of the equation.

[Blue250X]

Thanks:)

[Seano300ex]

52 mph

[bwamos]

Originally posted by Seano300ex
a while ago in dirtwheels....

I while ago (about 7 years ago) I read that if you add a 38mm Mikuni FS Carb (it had no accelerator pump) to a 300ex it would make it run like a 250R. :eek2:

They tend to pull "facts" out of their butts.. lol.

What they should have said was. If you don't feather the clutch it would dog real bad because it doesnt have an accelrator pump, and the fuel tube is on the opposite side of the carb so with the funky routing if you hit a hill right you'd starve the motor. The throttle cable provided also hits the fuel tank so you had to order a custom cable or tilt the carburetor about 10degrees to the right(exasperating the starvation problem). The pull on the included twist throttle wouldn't open/close the carb fully. Other than that it was great. I put the stocker back on a month later.. lol.

I wonder if they actually test anything. LOL. If they do it's not objective, or correct.. lol.

[gnccguy]

hey guys i used to race a 2002 300ex nice ride to play and learn i had a 11.5:1 high comp wiseco piston, stage 2 cam, stage 2 jets, hardened rockers ,ported and polished,k&n filter no lid with a 14 tooth front and a 36 rear sprocket and still had allkinds of lowend with 20" rear tires . and could keep up with a 400ex with a pipe and a stock 400ex runs 65 it was all my bike would do in the rev.

a stock 300 runs around 55 give or take a few

[dork]

my 300 w/350x motor and 14/36 gearing ran 73.8 with gps and had a bit more to go, probably 74-75.

bwamos, my buddy had one of those mikuni carb 'kits', it was a joke. wouldn't fit under the tank, had to run a twist, and didn't run much better than stock. thank god for the 400ex and FCR. also, what gearing were you running to get 74 out of yours?

[bwamos]

14/36 but that's pegged out on the higher limiter on smooth hard pack w/ a slight downhill incline w/ my lighter stock 22's.. lol. There's only 2 spots smooth enough and long enough that I can do that.. lol. (legaly at least, I don't ride on roads).

It has a hard time hitting the limit on anything else with that gearing.. lol. That's pretty much just to see what it could do. I normally run 13/36 gearing which tops me out in the mid to upper 60's.

I bet if you put the stock 2-ply 22's on your 350x you could get quite a bit more.. lol. A lot less rotating mass.. lol. (yes I cheated). But my buddies and I had a bet. They didn't think a 300ex couldn't break the 70mph mark.. lol. So I optimized.. lol. The banshee still out ran me though.. LOL.

[dork]

22's, ok, that makes sense. i had 20's. yea either way thats moving, the front fenders turn into wings at those speeds:D

[2muchquad]

Yeah it COULD be possible but i cant imagine a 300ex doing 76mph with 18in tires.Im running 14/34 gearing and i can blow it up in 5th if i wanted and i dont have a rev limiter.I cant say the exact speed though but with the bore kit and fcr carb etc,it maxes out pretty quick.the 18s arent the tire of choice for high speed runs,it works for the track though.;)