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Thread: ATC 200X Cylinder on a 185 ?

  1. 02-22-2005, 02:50 AM #1
    ROBTHEROD
    ROBTHEROD is offline New to the board Arm chair racerNew to the board
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    ATC 200X Cylinder on a 185 ?

    Will a 200X cylinder fit on a 185 motor? Will the stroke be the same? Do you need to change the head too?

    Thanks for any info.
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  2. 02-22-2005, 03:14 AM #2
    HaggLE
    HaggLE is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Yes it will fit straight on! The two cylinders are identical except for the hole in the middle and the fins are slightly larger.

    You dont need to change the head because they are the same.

    Ok now, as for the stroke, its time for a lesson. The stroke is purely determined by the crank. The cylinder length doesnt make the piston travel any further or any less. Another thing, the rod length has no affect on the stroke length. Alot of people get this confused because they think that if you put a longer rod in the piston will come up further. Whilst this is true, the exact distance the piston will be higher up will be the exact distance the piston wont go down.

    Oh yeah, the cranks and rods are the same for 185 and 200 and we are strictly only talking about 2 valve 200x motors for this entire scenario.
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  3. 02-22-2005, 09:45 AM #3
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    thefox
    thefox is offline Power User Lord of the trike
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    Quote Originally Posted by ROBTHEROD
    Will a 200X cylinder fit on a 185 motor? Will the stroke be the same? Do you need to change the head too?

    Thanks for any info.
    You can only use the '83-'85 200x cylinder. The '86 & '87 200x are alot different.
    1984 Yamaha YT 60 Tri Zinger(current project)
    1983 Yamaha YTM 200 (rear suspension kit)..... long term project
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  4. 02-23-2005, 12:15 AM #4
    83185s
    83185s is offline Power User Roostin Away
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    yup all true! i got my 200x complete top end on my 185 with a 12:1 wiseco 67mm in it..it all works
    trikes owned:
    85' 200m - sold
    84' 200x - sold
    83' 185s - sold
    82' 185s - sold
    85' 350x !!! - selling
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