Highest top speed 250 / 300?

M

motopsycho87

New member
Just wondering what the absolute fastest anyone has out of these bikes (2 strokes), obviously using insane gearing changes, just wondering what the bike tops out at (with regards to running out of power instead of revs).

50+ bhp should easily equal about 110mph?
 
I had my 02 EC300 to ~84mph in the desert with stock gearing (13/49) and a trials tire (which is taller, so has the same affect as running taller gearing.) Go here: http://gearingcommander.com/ and you can calculate all sorts of gearing/ rpm/ top speed/ shift point/ tire size changes. They have a 2012 GG EC300 in their database that you can use. I know that my KTM690 seems to hit a wall at ~110mph with me onboard (6'5") regardless of gearing and it makes over 60hp but is about 100lbs heavier.
 
Havn't tried it with stock gearing yet but I had my 2011 xc250 up to 82mph with 13;52 gearing. But I wouldn't normally run a bike out that hard. Got mixed up at a timekeeper and by the time I figured out I had taken a wrong turn I was way behind on time. Had about 5 miles of gravel road to try and catch back up. I kept it pinned the whole way and zero'd the next check. I couldn't believe that the motor didn't come apart on me. I think what saved me is I still had a 180 main in it from running down in AZ.
 
AZRickD said:
Which is why I have no issue gearing down as much as I do. 13/52 or 12/48.

I like it.
Click to expand...

I did run 13/48 on the 03 when doing longer ds type events. Made the road sections much more bearable. Less vibes as the motor just wasn't working as much at 50-55.
 
If I were to cruel sport it I would pop the 13 back on for that ride and remove it afterward. Now that I have a Yammie WR450, I have no need to consider that.
 
So no-one has really geared for absolute top end then? Interesting as I had 110mph (GPS) out of a Drz400s before with only base gasket, carb and exhaust mods! Fair dues it was on a slight decline, but would hit 100 no problem!
 
motopsycho87 said:
So no-one has really geared for absolute top end then? Interesting as I had 110mph (GPS) out of a Drz400s before with only base gasket, carb and exhaust mods! Fair dues it was on a slight decline, but would hit 100 no problem!
Click to expand...

Most of trail ride/race these bikes. Tight woods and top end don't really go together haha.

Also transmission gearing plays a part and a DRZ is built to be a dual sport so you will get more top end out of it. These GG's are geared for off-road.
 
Hi, I've recently put road going gearing, 14/40 on my 08 250ec.

It's got the standard wheels in it 21"/18" with trailwing tyres fitted.

The most I've had out of it so far is 91mph, (on private roads officer, there
was still a bit left but not much. I recon 95 to 100 absolute max, but it does
start to get a bit flighty at those speeds. I used a calibrated cycle computer
as a speedo so I don't know how accurate the reading would be.

A 14 tooth front sprocket is the biggest you can fit, as far as I'm aware,
without any modification, but Talon do make a 38 tooth rear which would
give it a bit more top end speed.

It's an absolute blast to ride on the road, 110 kilos and 49 bhp if the figures
are to be believed, make it a proper hooligan tool which doesn't promote
sensible riding, at least not with me. If you think an Aprilia RS250 only
makes a few horsepower more and is 30 or so Kgs heavier it may give you
an idea what it's like. There maybe some super moto wheels on the cards!
 
Last edited:
You cannot compare the made for offroad riding Gas Gas street performance capabilities to the made for street riding Aprilla GS .

I know what you are thinking, but it's wrong.
You can't just look at HP comparisons.

To further illustrate.Imagine putting the Aprilla GS in the Gasser chassis.And shoeing the Gas Gas engine into the Aprilla.

Now what do you got??
Try riding your new Gasser offroad.Throw a few hillclimbs in there while your at it.
Then take your new Aprilla out for a street ride with the boys and see how that goes for you.

No Mann.
 
I remember riding with my mates 2001/2 sm250 when I had a gsx750f and clocked him at 110mph. I had 116 out of my drz400s by GPS... All down to gearing really
 
Comes down to a bit more then gearing.
Power and torque curves dependent on engine design specifically for the requirements of the particular motorcycle.Matched to a gear box in relation to final gearing.

Take the Aprilla GS and run it in the "standing quarter mile"
Throw what ever tires and final gearing you want and run your Gasser in the standing quarter.
Its a blood bath.

Or take your supermoto Gasser to a local track and go try to chase down the Aprilla.
Shittt.
 
I'm interested in making a true dual sport out of my '11 EC300. I have been unable to find anything smaller than a 48 tooth rear sprocket. Spawtydawg where can I get that 38 tooth that you mentioned?
 
Bobt250 said:
I'm interested in making a true dual sport out of my '11 EC300. I have been unable to find anything smaller than a 48 tooth rear sprocket. Spawtydawg where can I get that 38 tooth that you mentioned?
Click to expand...

Hi Bobt250, Google "Talon engineering" and contact them. They're a company
here in the UK who make dirt bike parts. I'm sure there wouldn't be a problem
sending parts to the US. You'll have some good fun on your 300 if you do. :)
 
gasgasxc said:
You cannot compare the made for offroad riding Gas Gas street performance capabilities to the made for street riding Aprilla GS .

I know what you are thinking, but it's wrong.
You can't just look at HP comparisons.

To further illustrate.Imagine putting the Aprilla GS in the Gasser chassis.And shoeing the Gas Gas engine into the Aprilla.

Now what do you got??
Try riding your new Gasser offroad.Throw a few hillclimbs in there while your at it.
Then take your new Aprilla out for a street ride with the boys and see how that goes for you.



No Mann.
Click to expand...

Who was comparing bikes??? I never once mentioned that the Gasser would be
faster, handle better, have more top speed etc etc.

The point I was trying to make was that the Gasser and Aprilia have very similar power to weight ratios and as a seat of the pants feel is very quick off the mark.
I recon that 0-60 times wouldn't be that much different and yes I have ridden
an RS250 in fact I've ridden a couple, albeit a few years ago.

A dirt bike turned into a road bike is always going to be a bit of a compromise
but it still can be a whole lot of fun for very few bucks, and a Gasser250 with road based gearing is a whole lot of fun, Mann!
 
Uh.
When you were trying trying to describe the street hooligan Gasser.
You said"think Aprilla RS".

This forum is viewed by more non members then members.
Almost a 5-1 ratio.So My comments-clarification-are always aimed for that group.
So many entry level and inexperienced riders out there seeking solid credible information based on fact - experience.Not fantasy.

Experienced riders can kind of see what you were trying to sorta get at.
A complete novice or inexperienced rider processes your assertion in a completely different way.

You mentioned the Aprilla RS in comparison to the power one could expect out of the Gasser.
I am saying it's no comparison at

Talk about your streeterzed Gasser all you want man it's free press and your opinion is as valid as anybody's.Riding a dirtbike on the street is a blast no matter what.

I would only ask that you go to your local track and take the Aprilla for a few orbits around the track if you insist on sticking with your earlier comparison.And I am not comparing handling and braking.I'm talkin engine performance also.We can both agree the Aprilla destroys the Gasser in braking and handling and I never took your original statement to mean you were suggesting otherwise.
Go ride one.That's the message.

Think.Bullets and ballistics.And then think of trying to explain that to someone who doesn't know much about guns by simply making comparisons using calibers.
 
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