yz250 engine

[tomi_csaszar]

hey, this is my first post. so far ive been more of a reader.

i have a 1990 blaster, and my engine is pretty f*cked. it has a brand new top end bored .50 over but my cases are cracked, clutch is done, and has transmission problems. ive decided no matter how much money i put into that engine to fix it, it will still be....just a blaster engine.

after some research and reading a few threads on engine swaps im seriously thinking about doing a yz250 engine swap.
i checked ebay and my price range is about $1000 plus shipping on a 2001 yz250 with all electical, carb, kickstarter etc. ready to roll.

the reson im going with the yz250 is because its small so it will fit nicely, water cooled so i wont have as many heating issues, and has some mad balls at 56hp stockI:I

i understand its not an overnight process, i will have to reweld the mounts, cut the swing arm and find and fit in a corect size radiator, fit a pipe etc. after that its smooth sailing...well smoother anyways.

im also planning on extending my swingarm (in the machine shop), and wider a-arms/axle then all the add on that i will eventually need. but obvously my main focus is the engine.

any info, sugestions, pics or anything that could help would be very much apreciated,

thanks for your time

 

[BaBarossa]

I've built a DT200R motor with perhaps 40HP in my Blaster, and I think it's the perfect choiceI:I ! 56HP will be very much and the yz250 engine will need much parts and work and is only for race. 10-15 Hours and you must change the piston rings and perhaps the piston also! My dude rids one for MX, the bike is great, but it's a expensive bike!
The DT engine will run 10000s of KM without repairing ( I hope so B-) ).

 

[hickskateboarder]

gonna have to strengthen that frame.

 

[tomi_csaszar]

yea but it would be hard to get my hands on a DT200 engine, i even checked my local dealer since i couldnt find one. complete watercooled dt top end would run me about $700+ just for the cylinder, head, piston and rings

yea i know about the rebuilds, im just hoping i will be able to notice its time for a new top end before i would blow the engine.

 

[woods4life]

just to clarify for me,what if you dont race the YZ motor and just normal person ride...must it still be rebuild after 15 hours? r can it run for a while before the rebuild if its not beat to death

 

[97badass]

every 15 hours? that would be a piston every damn weekend!!!

 

[hickskateboarder]

yeah........ i can only see it being rebuilt every 15 hours if its all out race with a bunch of other crap done to it. but for someone just playin around, once a year if that i would say.

 

[tomi_csaszar]

no i guess every 15 hours would be driving the sh*t out of it with mods.... my friend drove his 2005 cr85 reving the sh*t out it for almost 2 years before he put on a new ring....still started and drove fine, only the powerband wasnt nearly as strong.
and his piston ring was broken and it still ran