RECENT POSTS

Is it really that bad to ride on the steet with the KDX?

Joined
May 9, 2007
Messages
29
Likes
0
#1
Well, first let me say that I just bought my first dirt bike. After much research, the KDX seemed the best 2-stroke out there for woods and all around cheap fun. I have no desire to ride at the track or blast like a psycho. For me, getting in the dirt is my total goal.

Anyhow I plan to plate the green beast. Why? Because I am formally from the communist west coast where dirt bikes are difficult at best to plate. So given the history of many states, I am sure Colorado greenies will eventually ban it here too. Thus my desire to get it plated now.

Anyhow, many people have predicted dire consequences if I ride my KDX on the street. Now let me explain the definition of "riding on the street". That would be tooling around Parker, taking the backroads to work or just generally tooling around. It is NOT riding down the e-470 at full tilt for 20 miles.

So, what do you think. Will my piston turn to slag the minute my knobbies hit the concrete? Will the wrist pins snap and crank shaft eject momentarily after it its first stoplight moment?

Personally I am incredulous. To think the KDX survives Woods assualt after woods assault, yet (many claim) the very same engine will burst into 1,000 parts just mere minutes after hitting the nearest arterial.

Thoughts?
 
Joined
Jul 18, 2001
Messages
675
Likes
0
#2
I think the DOT tires will help keep decent tire life for awhile. If you are going to be doing these jaunts frequently then maybe set aside money for the appropriate maintenance as needed when the time comes.
I had 2 kdx's and a I think from what you are describing that your intended riding thru town or up and around roads for various stretches should be okay. I was riding my ktm around the neighbor hood to a 50 acre wooded lot and thought how much it would be nice just to rip it around town once and awhile. I Wonder if you could get the kdx supermotard like with some slick tires...

I am curious what some people have to say...
 
Joined
Sep 19, 2006
Messages
254
Likes
0
#3
I bought my KDX in SM set-up... It didn't last long in the configuration though. I put some knobbies on and started tearing up the woods. I think having a plated bike (of any kind) is a great idea. A plate is required when riding down most forest service roads and it's just a piece of mind that you know that you can't get pulled over for having an non plated bike. My KDX has also been around town, alot. Never had any problems riding on the street other than the tires wearing out faster.
 
Joined
Oct 19, 2006
Messages
2,142
Likes
1
#4
I've seen a lot of plated KDX's and 500's. I wouldn't consider plating my CR250, even with the bike geared 14/51, which gives it a top speed in the 70's. The bike sings at full throttle running up to 70 mph, but if you try to cruise it at speeds above 45 mph it just sounds awful. With the throttle barely cracked open doing that kind of rpm, the bike has a really uneven firing interval. At lower speeds, it fires once every couple of revs but it's even and doesn't jerk you around as much. The porting on the KDX may be more capable of cruising at high rpms. I don't know. Some bikes can take it, some can't.
 

G. Gearloose

Pigment of ur imagination
Joined
Jul 24, 2000
Messages
709
Likes
0
#5
KDX wide ratio gearbox is well suited to the street. Keep your CS sprocket at 13 or higher. I ran a 15 the first few years unknown to me.
 
Joined
Dec 13, 2006
Messages
199
Likes
0
#6
The engine does not mind being at an rpm for long periods of time? I suppose low rpm cruising would be fine. Does street riding conrtibute to faster engine rebuilds? I mean I hear every 100 hours or so or new pistons. Street riding would eat that up quick. Maybe it is 100 hours with high rpm riding.....


Ahh I don't know. Bottom line, is the KDX motor really suitd for street riding with out constant rebuildig? A DR or XR can go years with no rebuild on the street. KDX too?

Anybody?
 
Joined
Apr 28, 2007
Messages
424
Likes
1
#7
Is there any relevance in this discussion to my riding my Suzuki dr200 55-70 more than at low speeds?


Something I ought to know? It's never seen the dirt, to be honest....But a dr200 is no kdx200.....

ebeck: A DR or XR can go years with no rebuild on the street. KDX too?


???
 
Joined
Aug 16, 2004
Messages
1,011
Likes
0
#8
There are many different definitions of "street riding". Tooling around town, light to light, it does just fine. Try and do any extended distance on it and sucks! With 13/49 gearing my bike pulled over 80 mph on GPS. Running 50 mph is buzzy and annoying, like you are reving the life out of the bike. Gearing up more could help, but still, it's not made for extended road duty.

I put some balanced dual sport tires on mine for a while and used it to commute to work (13 miles each way, 35-55 mph). That was about the longest tolerable distance, my hands would be vibrating when I got there. I've done 60+ mile of road one day. It's amazing how much more fatigued that can make you compared to 60 miles of trail riding!

As far as durability, I don't think it hurts much. With no cushion drive hub power shifting can be fatal to transmission parts, I was careful and never had a problem.
Running too lean on the pilot can be especially bad, if you are coasting down from speed it will be getting hardly any fuel.
Extended high rpm can be bad for a 2 stroke, piston crown cooling isn't their strong point, and a burn down could occur. Again, jet properly and don't spend 15 minutes cruising 1/2 throttle at 8000 rpm and you'll be fine!
And knobbies do not last on pavement! When I only got to ride trails every few weeks I dedicated a set of dual sport tires for road riding. Changing tires for a day in the dirt was worth the $$$ saved in burned off knobbies.
 
Joined
Dec 13, 2006
Messages
199
Likes
0
#9
ebeck: A DR or XR can go years with no rebuild on the street. KDX too?
That is a question not a statment. I read about guys doing dual sport rides for many thousands of miles over years of life and have yet to rebuild them. Just what I have read.

I am pretty sure the KDX motor can not do that. Hence the question based on what I have read about big dual sport bikes.

I may build a KDX for localy tooling around. 5 and 10 mile outings.
 

jaguar

Subscriber
Joined
Jul 29, 2000
Messages
1,450
Likes
76
Location
South America
#10
street riding the KDX

well, I rode the SR model of the KDX for 3 years in Paraguay and never had a problem except for when I started porting it and stuff for MX. Then I seized it once when I was going about 40mph and it was right in the middle of its powerband. But before that I had ridden it on the highway many times without a problem. But maybe then the rpm's were above the meat of the powerband. I'd recommend going a little rich on the needle. Raise it at least one notch.
 
Joined
Dec 29, 2006
Messages
23
Likes
0
#11
if you want to do it then do it,you only live once.i do 95% of my riding on street and dont see it as a problem.considering you"ll be in traffic you want be loading the engine to much.i have a 04 220 and love riding it on street as well as off road.i normally ride every day but just ad an op on my nose so cuddnt ride for 2 weeks so i put a wiseco piston in it and a pro curcuit pipe.i done 3200 miles on stock piston and bike was still very strong so dont sweat about engine probs because you wont get any.the miles do clock up faster and nobbys dont last to long on tarmark but the buzz factor makes up for this.hope this helps.
 
Joined
Feb 1, 2001
Messages
171
Likes
0
#12
I have a 1997 220 and do mostly street on it. I run a 15/45. The KDX has such a low first gear you can get away with the tall gearing. My power valve opens about 65mph, so 55-60 mph is nice. Top speed is 91 on the GPS. Adam728 is right about using a fat pilot let it four stroke or blubber some. I love using up all my old knobbies. If you remove the rim locks, thing are much smoother on the highway. If you need them just install a second one 180 degrees from the other one. I need to find a way to document the longevity of the motor. Maybe Dirt Rider would like to do a really long term test teardown? I have 5200 miles on it now. I change the plug once a year and the tranny oil twice a year. The real kicker is it has never fouled a plug and it only gets Wal-Mart Super tech outboard oil (8$ gallon :whoa: ) at 40 to 1. :ride:
 
Joined
Feb 3, 2007
Messages
7
Likes
0
#13
Hey Chris,
I picked up a 1990 KDX 200 this spring and got plates on it and ride it like you describe your plan is to. I havn't had any problems, but did notice the fast wear on the rear tire. Try to stick to dirt roads when possibile. Run up north to Wyoming if you want a riding buddy.

Dallas in Wheatland
 
Joined
Dec 11, 2003
Messages
46
Likes
0
#15
I have 3500 miles on my kdx 200 mostly road miles. I have days of near 150 miles on pavement and I treat it sometimes like a short distance aventure bike. I noticed when I pulled it apart last fall that the rings were in real good shape. I thought they would be fried. I wouldn't be surprised to see 7000+ street miles on this bike before piston and rings were needed. Like everyone says be sure the jetting is a little rich on the bottom end (where your throttle will be most the time)and be sure there are no lean spots in the throttle and run a good syn oil at probably 32:1 to protect the crank and let her rip. IMHO