YZ250 Blaster Build Log

best · Jul 19, 2015

Tbrock77 said:
With all the extra power I think stock is out of the question but I will be running a stock for a while to do all the original testing.

I ran stock length with the 2003 KTM 250 motor for a while.
Oh yes, it will wheelie on command at any speed and makes hillclimbs difficult.
I only have a 2" extension in it now, like it, much better control on hillclimbs and still wheelies well at speed.
My son has a 4" extension under one of his big hp Blasters. Getting a bit long, especially on slippery surfaces.
Banshee Dave has good advice.

Steve

best · Jul 19, 2015

Tbrock77 said:
With all the extra power I think stock is out of the question but I will be running a stock for a while to do all the original testing.

I ran stock length with the 2003 KTM 250 motor for a while.
Oh yes, it will wheelie on command at any speed and makes hillclimbs difficult.
I only have a 2" extension in it now, like it, much better control on hillclimbs and still wheelies well at speed.
My son has a 4" extension under one of his big hp Blasters. Getting a bit long, especially on slippery surfaces.
Banshee Dave has good advice.

Steve

Tbrock77 · Jul 19, 2015

best said:
I ran stock length with the 2003 KTM 250 motor for a while.
Oh yes, it will wheelie on command at any speed and makes hillclimbs difficult.
I only have a 2" extension in it now, like it, much better control on hillclimbs and still wheelies well at speed.
My son has a 4" extension under one of his big hp Blasters. Getting a bit long, especially on slippery surfaces.
Banshee Dave has good advice.

Steve

I think I'll go with a +4 then. There is a lot of hills around here and I'm nothing more than an amatuer rider at best so I think the stability that will come from it will be worth it, even if I lose a bit of traction. I also prefer all 4 tires on the ground. I do have a set of banshee rear hubs so I could run a bigger wheel and tire in the back if that would be a good contribute to anything.

harley1-5 · Jul 19, 2015

im being taught soon so maybe a hybrid will be in my future

Tbrock77 · Jul 26, 2015

What throttle cable did you other yz250 blaster guys use? Did you keep it twist throttle? Personally I'd like to use the thumb throttle

bansheedave · Jul 26, 2015

I kept the twist throttle and cable.

Tbrock77 · Jul 27, 2015

Anyone know what the name or part number for this thing is?

bansheedave · Jul 27, 2015

Tbrock77 said:
Anyone know what the name or part number for this thing is?View attachment 24241

It locks the cable end into the slide. It goes in before you put the spring in the slide. Basically, you compress the spring, slide the throttle cable into the retainer inside the slide top, put in the lock than let go of the spring

bansheedave · Jul 27, 2015

It prevents the cable from coming out of the retainer

Tbrock77 · Jul 27, 2015

I know what it is, I asked for the name or part number because mine misplaced itself haha

Fast6hand · Jul 27, 2015

Tbrock77 said:
I know what it is, I asked for the name or part number because mine misplaced itself haha

I may have one.

Tbrock77 · Jul 27, 2015

Fast6hand said:
I may have one.

Pm me if you have one, I'd really appreciate it.

bansheedave · Jul 27, 2015

Tbrock77 said:
I know what it is, I asked for the name or part number because mine misplaced itself haha

Sorry, must have misread your post. My bad

Tbrock77 · Jul 28, 2015

bansheedave said:
Sorry, must have misread your post. My bad

No worries, my question was probably just poorly worded.

Tbrock77 · Jul 28, 2015

I haven't been able to make any real progress with it the last couple weeks because my friend whose suppose to weld the stuff for me has been busy. I'm currently trying to button up all the little stuff that needs to be done that doesn't involve welding, the carb, electronics, swing arm, kicker, etc. I ordered a clutch cable so I'm waiting on that and I'm still trying to get my hands on that little gold thing that holds the throttle cable to the slide.

Fast6hand · Jul 29, 2015

Tbrock77 said:
I haven't been able to make any real progress with it the last couple weeks because my friend whose suppose to weld the stuff for me has been busy. I'm currently trying to button up all the little stuff that needs to be done that doesn't involve welding, the carb, electronics, swing arm, kicker, etc. I ordered a clutch cable so I'm waiting on that and I'm still trying to get my hands on that little gold thing that holds the throttle cable to the slide.

Pm me, I got that piece.

YZ Otis · Jul 29, 2015

Tbrock77 said:
What throttle cable did you other yz250 blaster guys use? Did you keep it twist throttle? Personally I'd like to use the thumb throttle

Tried the twist throttle. The kid caught a grass clump with the right front at the dunes .. the jammed bars and instinct to hold on caused a WOT reaction .. pretty spectacular launch as the boy and bike parted company .. didn't give him a chance to get used to it .. changed it the next day .. had a cable from Pro-Motion .. at some point I modified the inside of the thumb throttle for more travel but I think that was for the 40mm alky carb.
Don't remember the part # but Pro-Motion had the cable

Tbrock77 · Jul 29, 2015

YZ Otis said:
Tried the twist throttle. The kid caught a grass clump with the right front at the dunes .. the jammed bars and instinct to hold on caused a WOT reaction .. pretty spectacular launch as the boy and bike parted company .. didn't give him a chance to get used to it .. changed it the next day .. had a cable from Pro-Motion .. at some point I modified the inside of the thumb throttle for more travel but I think that was for the 40mm alky carb.
Don't remember the part # but Pro-Motion had the cable

I've never cared for twist throttles, IMO they're dangerous, and you gave a perfect example of that. I'll deal with it for the time being but I will be working towards replacing it with a thumb throttle. I have one off a yfz450 that should give it plenty of travel.

Fast6hand · Jul 29, 2015

Tbrock77 said:
I've never cared for twist throttles, IMO they're dangerous, and you gave a perfect example of that. I'll deal with it for the time being but I will be working towards replacing it with a thumb throttle. I have one off a yfz450 that should give it plenty of travel.

Yea I'm running one from a yfz450 with no issues.

jus_me · Aug 3, 2015

Tbrock77 said:
I fell in love with the Alba racing Pro Elite nerf bars when I had them on my trx450r, they're wide, sturdy and look great (I'm sure they're knockoffs of some other brand or something along those lines). Unfortunately they do not make them for the blaster (They will if we can get 5000-10000 people to support them, I didn't bother even trying) so I looked around for a set for a smaller quad and found they make them for the raptor 250/350. I plan on modifying them to fit the blaster and to accommodate the backward kick starter. As for the plastics, I don't think they will interfere but I didn't check. I'll throw a set of rears on tomorrow and see what happens.

Not hard at all to make work. Just a little cutting and welding. The hardest part I had to figure out was where to put the front tube mount. Since you will have a completely different pipe you may just be able to run it across the frame. I cut the pegs off and welded round tubing onto the frame tabs so the nerfs could slide right on. I also dropped the pegs down a little and moved them back also. There are pics somewhere in my build thread. If you cant find them or if you want some more pics I can take a few for ya.

YZ250 Blaster Build Log

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