Hey guys i am rebuilding my 1988 250x and i want to replace the engine... i want to use a xr650r motor or a 350x motor does anyone have some advice on which would be better or any pictures of thier own conversions
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Junior Member
new motor
Hey guys i am rebuilding my 1988 250x and i want to replace the engine... i want to use a xr650r motor or a 350x motor does anyone have some advice on which would be better or any pictures of thier own conversions
resident bodyman
I may be wrong, but I don't think an xr650r motor will fit without major frame modifications. The 350x is probably one of the most popular 300ex/250x swaps.
'04 TRX450R -
DASA Classic full exhast / CylinderWorks 97mm cylinder / Venom 12.25:1 piston / HotCams stg2 cam / K&N / Outerwears / Pro-Armor XC nerfs / TAG X5 bars / AC grab bar / Burgard +2 arms
Senior Member
i have a fully built 350x motor. this thing is wicked fast. it will keep up to stock 450s. let me no if ur interested.
Junior Member
hey tell me about your motor.. how many hours? who built it ?some pictures and a price would be nice thanks man
Senior Member
its got about 10 hours since rebuild. a guy in green bay, wis. built it. it does have a cracked side case from where the chain slipped but it can be replaced for around $50. $1000 negotiable.
Senior Member
the cracked side case.
Junior Member
no thanks i think i am just going to modify my motor thanks alot though
Senior Member
the 350x swap is super simple.. you have to remove about 2" off the rear upper mount and make a spacer...
i bought a complete trike for 500 and it ran i was able to use a spacer that was in the trike to mount the motor.. and the whole rear end off the 3 wheeler bolts to the 250x easily.. the swinger is about 1 1/2" longer and the axel is 2 1/4" wider
Present Bikes
1) 87' 250x/350x hybrid
2) 89' honda 250r
past bikes:
87' 250r
00' 330ex
04' 400ex
86' lt230s
84' atc110 blue sweet heart
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