The KTM250 stock is already putting out more power than 95% of the blasters on this site including mine.
KTM powered Blaster
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The KTM250 stock is already putting out more power than 95% of the blasters on this site including mine.
The KTM250 stock is already putting out more power than 95% of the blasters on this site including mine.
I just feel that if your taking the time to delete mounts, and make new ones + you already have the 380 then why not do the 380 haha
I'm sure the 250 will be fine B)
Great project! I'm tuned in ... is the ktm a 6 speed trans?
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Hey, 50 hp is plenty ... why would he need a 380???? ... LOL
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Hey, 50 hp is plenty ... why would he need a 380???? ... LOL
Man, I gotta tell you, that bored and rifled carb looks pretty darn hot!
With car engines I've done some porting work with the intention of keeping
swirl going in the cylinder to keep air in movement up to keep fuel suspended,
so I am aware of the theory. So, how's it work?
Tell me more about it, do you have any links to articles?
I currently ride a 125 and a 300 KTM and have rode the 250.
The 300 is tamer than the 250 mainly because it has more low end torque and a less noticeable powerband.
The 250 in a 210 lbs bike is a crazy wild ride, especially with a powerband that hits like a lightswitch
and accelerates you like a slingshot does a BB. Low end power is good, not overwhelming,
but certainly more than the DT200 motor.
I have not rode the 380 yet, just building it into a bike more or less concurrently with the Blaster project.
From what I am told, it is a torky lugger. More like a tractor than a racecar. A darned fast tractor!
With the extra weight of the Blaster it may have been a better choice, but it didn't fit too well.
The 380 stator cover is a lot bigger and the engine would have had to sit high in the frame or the cut or bent.
And it is a hard starting pig. Massive compression requires a good clean kick with nothing in the way.
My right leg is a bit weak from old injuries anyway, so the 380 is probably best suited in a hill climbing bike.
The 250 fit pretty good, starts well, and triples the power of the old 200.
Moreover, it is reliable, doesn't overheat and will idle and run slow if required.
The cost of swapping it is going to be less than rebuilding the YF200 motor.
I am hoping it is going to be a good choice, and did I mention reliable?
These KTMs hold together pretty good.
If I were to do HP mods to it (and I have with my 125), I would:
Pipe, pipe, pipe! Find the best pipe for my riding.
Gap the piston to the head for about 1mm clearance. Works awesome!
Jet the carb. Really important for a 2 stroke, usually off on stock bikes.
Play with timing, advance and different CDI box curve.
Port match the cylinder and block by stuffing instead of grinding.
We gapped, jetted and timed my son's Blaster for a big boost in power.
Don't have a spare pipe for it yet. With a 2 stroke, you can never have too big of a collection of pipes...
can't wait to see how this rebuild goes. wish you tried the 380 because i just so happen to have bought a 1989 ktm 350 for 250$ off craigslist. i wanted to see if dropping the 350 in the blaster was even doable before i try dumping serious cash into it.
good luck with the build it looks great, keep the pictures coming
good luck with the build it looks great, keep the pictures coming
I'll see if I can get you some pictures of where the 380 (and most of the other
EXC engines) don't fit. The smaller stator and cover of the SX motor was the
help with this. Some of those early KTM engines had the chain on the right
side didn't they? I don't know what years.
Steve
Anythings doable. I've seen YZ80 blasters on up to a 1300cc busa 4 cylinder turbo.
Steve, I respect your decision keep up the good work brother!
Hey i heard you mention an air box fitting, instead you should just get a K&N filter you could just clamp right onto the carb
I run a modified CFM airbox for that reason but also a pod for draging.
If your that worried about running a pod put an outerwares over it.
Of course if your going through river beds and such a pod is not a good ideal at all.
I plan to get wet, muddy and sandy so I have to build a good air box.
Thinking of using the stock Blaster box and filter, but with a bigger straight rubber hose and
a metal adapter to the box. Looks like there is going to be some interference with the LTZ400 shock.
Going to have to plan ahead for this...
Nice snow pict Novis, we actually have more snow than that at the moment.
I have got a 5' wall of snow in front of my garage door at the moment. The plow guy
cannot find any more room to put it. It is actually making for hard sledding in the woods.
Not much action on my Blaster in the past few days. I have to work occasionally (yes, it is true)
and I have been away on a course, but I can give you this picture:
Thumb throttle hooked up, 40mm spacer on KTM twister cable so it can be used with
thumb throttle box. Split pieces of fuel line over the cable, into the threaded adaptor
and closed up. Turned here so you can see the splits, but normally down and covered
by the rubber.
What I would like is close up photos of what you guys have done to mount your radiators.
Any advice and photos guys?
Steve
Thinking of using the stock Blaster box and filter, but with a bigger straight rubber hose and
a metal adapter to the box. Looks like there is going to be some interference with the LTZ400 shock.
Going to have to plan ahead for this...
Nice snow pict Novis, we actually have more snow than that at the moment.
I have got a 5' wall of snow in front of my garage door at the moment. The plow guy
cannot find any more room to put it. It is actually making for hard sledding in the woods.
Not much action on my Blaster in the past few days. I have to work occasionally (yes, it is true)
and I have been away on a course, but I can give you this picture:
Thumb throttle hooked up, 40mm spacer on KTM twister cable so it can be used with
thumb throttle box. Split pieces of fuel line over the cable, into the threaded adaptor
and closed up. Turned here so you can see the splits, but normally down and covered
by the rubber.
What I would like is close up photos of what you guys have done to mount your radiators.
Any advice and photos guys?
Steve
PaulieB, looks like a good trick to fit the air box. I like it.
Beautiful day out today, sunny, snow starting to melt.
Thought I'd catch a picture before it is gone...
Maybe I have a few more days before the snow is gone...
Those are 9'6" doors and that is a car hauling trailer beside the garage.
There is a Taurus Station Wagon covered in snow in this picture too. Guess where?
Well, the bike is a runner. Started the engine up today.
No pipe yet, but fixed the kickstart interference problem with a gentle and slight flattening of the frame tube.
Hooked up a kill switch and the rest of the wiring. Dead simple by the way.
The KTM coil bolted into the Blaster coil mounts perfectly.
Also tried out the LTZ400 shock for size.
It touches the plastic slightly and its bolt holes are smaller than the frame holes.
Hence the need for bushings I see.
This picture shows the torturous path from carb to airbox.
I think the KTM carb is at a bit of a different angle than the Blaster carb?
Still looking for radiator mount ideas, if anyone has pictures?
Steve
Beautiful day out today, sunny, snow starting to melt.
Thought I'd catch a picture before it is gone...
Maybe I have a few more days before the snow is gone...
Those are 9'6" doors and that is a car hauling trailer beside the garage.
There is a Taurus Station Wagon covered in snow in this picture too. Guess where?
Well, the bike is a runner. Started the engine up today.
No pipe yet, but fixed the kickstart interference problem with a gentle and slight flattening of the frame tube.
Hooked up a kill switch and the rest of the wiring. Dead simple by the way.
The KTM coil bolted into the Blaster coil mounts perfectly.
Also tried out the LTZ400 shock for size.
It touches the plastic slightly and its bolt holes are smaller than the frame holes.
Hence the need for bushings I see.
This picture shows the torturous path from carb to airbox.
I think the KTM carb is at a bit of a different angle than the Blaster carb?
Still looking for radiator mount ideas, if anyone has pictures?
Steve
You've probably seen this already. I isolated the radiator with rubber washers so the vibration wouldn't tear the tabs off the radiator. Don't know, your fan might hit the tank. Had to cut a hole in the right fender for the radiator fill/cap.
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I am back, I have been working on the beast and using your tips.
The rad is in:
Here it is with hoses hooked up and a Ninja 250 thermostat:
As you can see the garage is still blocked in with snow, but I got the clutch bled,
(had to reverse bleed it) and the Blaster is mobile. It just spins on the garage floor.
Plastics on for a trial fit:
Still to come, pipe, air intake, rear brakes...
The rad is in:
Here it is with hoses hooked up and a Ninja 250 thermostat:
As you can see the garage is still blocked in with snow, but I got the clutch bled,
(had to reverse bleed it) and the Blaster is mobile. It just spins on the garage floor.
Plastics on for a trial fit:
Still to come, pipe, air intake, rear brakes...
Beautiful build man. I'm going to keep my eye on this one. Reps for all the hard work! No one else giving you rep for posting all this? Come on guys!!!!!!!
lookin good cant wait to see a vid.
This build and the other 250 swap threads made me buy my dt200 to swap out myself!
This build and the other 250 swap threads made me buy my dt200 to swap out myself!
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