Quick question

[NAXxcbanshee11]

Hey guys wut all has to be done to put a 4 stroke motor in a a 250r fram is it very compiatied (sp) and if so which motor is good and wut would something like this to get done? I sure its been asked before but just checking

[Pvt. Maggot]

4 stroke? they do 250x 300ex 350x xr600 theres alot of possibilitys..all depends on what you need

[Mxjunkie]

my friend has a 250r with a worked 350x motor, its insane but hard to start with the high compression and everything, even with compression releases its hard to kick

[trick450r]

The most popular would be a crf450r motor or a yz426, yz 400 and so on i will be doing the same thing in the future xept my R frame will house a worked ktm 520 motor :macho

[NAXxcbanshee11]

Yea i'm looking for a good motor for xc racing. and something that will run with the 450's but i was also thinkin the yzf or the crf too. wut all would I need

[trick450r]

lets see for a stock R frame you would need to pick your motor either buy your motor and fab your own mounts, or you could call hermann racing or other companies about motor mount extensions...if i were you i would pm 416exmx he has had 2-3 crf quads in 400ex chassis, if i were you i would do either a ktm 520, or a crf450 motor, if you dont know about the chassis you will need shocks and proly a shorter swinger! you will need a good set of tires for XC i prefer razr 2 and you might want to invest in a good set of hyper rims all round...hope this helps .......oh and you will have to regear for either of those motors if you will limit the quad to XC racing!!!:devil:

[NAXxcbanshee11]

Well the 250r has all axis shocks +1 a-armr stock size swing arm hires and razor 2's but here in fl they no longer have a 2 stroke class its just all togather so i was thinking about putiing a 4 stroke in