Hey guys new to the board but not to bikes. I've got a 92 yz250 that needs a top end and the yz is too tall for my legs anyways. So I've been reading up and noticed the blaster is a common swap. I know there's fab work. And it's expensive that doesn't bother me I have a welder and I can do anything that needs to be done. If anyone could tell me what would be considered a good range of years to go with for getting a blaster frame that would be great. And also what are some common obstacles I'll come in contact with. Any advice is greatly appreciated.
Yz250 Swap Q's
- Thread starter Grizz00
- Start date
read up in these threads, this is one of the nicest yz250 swaps on here...........
http://www.blasterforum.com/threads/got-a-2001-yz-250-for-my-blaster.24529/
http://www.blasterforum.com/threads/yz-250-blaster-finally-alive.40880/
http://www.blasterforum.com/threads/got-a-2001-yz-250-for-my-blaster.24529/
http://www.blasterforum.com/threads/yz-250-blaster-finally-alive.40880/
Yea I've only had one bike with hydro brakes and I do miss it dearly. I really don't understand where the companies were coming from when they thought drum brakes on an all terrain vehicle would work.
(repete from old thread)
IMHO .. the YZ gear set isn't a wide enough ratio for a 4 wheeler .. to get some low speed grunt you sacrifice top speed & if you want a decent top speed the bike is scooting right along at idle in 1st .. lotsa clutching on trails .. we change sprockets & chain going from trails to dunes .. the Blaster 6sd is perfect with it's super low 1st
I don't have the ratios for newer YZ'S. I used WR gears cuz 1st is a bit lower than the Blaster 2nd and 5th is a bit higher than Blaster 6th. WR 5th is like overdrive. The YZ is taller in 1st than the Blaster 2nd and lower in 5th than the Blaster 6th. To me the WR gear set seemed better suited for a quad. Guess it depends on what you want. The 92 is a good motor. With these swaps the pipe is always the issue. Anyway, sumthin to think about with the WR/YZ swap.
Here's sum numbers to give you an idea of the difference between the Blaster, YZ and WR gearboxs.
Gear Ratios
---- Blaster --------- 89 WR250 -------- 90 YZ250 -------- Tri-Z
1st 34/11 (3.091) -- 32/14 (2.285) -- 31/15 (2.067) -- 30/14 (2.142)
2nd 31/14 (2.214) -- 29/17 (1.706) -- 29/17 (1.706) -- 28/16 (1.750)
3rd 25/15 (1.667) -- 24/18 (1.333) -- 22/16 (1.375) -- 26/18 (1.555)
4th 20/16 (1.250) -- 21/20 (1.050) -- 22/19 (1.158) -- 24/20 (1.200)
5th 19/18 (1.056) -- 21/25 (0.840) -- 23/23 (1.000) -- 22/22 (1.000)
6th 19/21 (0.905) ------ N/A ----------- N/A ------------- NA ------
IMHO .. the YZ gear set isn't a wide enough ratio for a 4 wheeler .. to get some low speed grunt you sacrifice top speed & if you want a decent top speed the bike is scooting right along at idle in 1st .. lotsa clutching on trails .. we change sprockets & chain going from trails to dunes .. the Blaster 6sd is perfect with it's super low 1st
I don't have the ratios for newer YZ'S. I used WR gears cuz 1st is a bit lower than the Blaster 2nd and 5th is a bit higher than Blaster 6th. WR 5th is like overdrive. The YZ is taller in 1st than the Blaster 2nd and lower in 5th than the Blaster 6th. To me the WR gear set seemed better suited for a quad. Guess it depends on what you want. The 92 is a good motor. With these swaps the pipe is always the issue. Anyway, sumthin to think about with the WR/YZ swap.
Here's sum numbers to give you an idea of the difference between the Blaster, YZ and WR gearboxs.
Gear Ratios
---- Blaster --------- 89 WR250 -------- 90 YZ250 -------- Tri-Z
1st 34/11 (3.091) -- 32/14 (2.285) -- 31/15 (2.067) -- 30/14 (2.142)
2nd 31/14 (2.214) -- 29/17 (1.706) -- 29/17 (1.706) -- 28/16 (1.750)
3rd 25/15 (1.667) -- 24/18 (1.333) -- 22/16 (1.375) -- 26/18 (1.555)
4th 20/16 (1.250) -- 21/20 (1.050) -- 22/19 (1.158) -- 24/20 (1.200)
5th 19/18 (1.056) -- 21/25 (0.840) -- 23/23 (1.000) -- 22/22 (1.000)
6th 19/21 (0.905) ------ N/A ----------- N/A ------------- NA ------
Yea I read that thread thanks for replying. This won't be a race setup just something to play around on. I have the motor so I just figured I would find something different to put it in. Otherwise I thought about just making some kind of go kart frame to put it in.
I have the option to go wide ratio in my kx motor. I know a guy on another site that will machine a kdx transmission to fit in my cases. If my stock setup isn't working the way I like, I will go that route.
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