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Thread: I have a question about higher compression and gas

  1. #1
    roger86200x is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    I have a question about higher compression and gas

    Hey...should I use higher octane gas or something with a Wiseco 10.5:1 compression piston (stock is 9.5:1) on My 86 200x???
    1984 Honda ATC 250r
    Bored .020 over Wiseco, Answer silencer, fresh motor, New connecting rod and balanced crank, Boyesen 2 stage power reeds

  2. #2
    '86X is offline First Time Rider Arm chair racerNew to the board
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    I have a question about higher compressin and gas

    93-93 should do it. Add a little octane booster to each tank of gas if you want to be safe.
    '86 ATC 350 X FOR SALE-- GONE!
    '86 ATC 200 X PARTING OUT
    '95 Banshee--The most feared ATV ever built
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  3. #3
    roger86200x is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    what happens if I dont?? lol ...if I run ...let's say...87 octane gas?? lol then what? :-D :?:
    1984 Honda ATC 250r
    Bored .020 over Wiseco, Answer silencer, fresh motor, New connecting rod and balanced crank, Boyesen 2 stage power reeds

  4. #4
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    Then you'll have detenation. If goes on to long you will burn a hole in your piston, lose of performance, and have to rebuild your top end after the piston goes!!
    1979 Honda 110 ATC, CEET gas tank cover, 25X11X9 rear tires
    1984 Honda 110 ATC, orignal blue plastics,
    1982 Yamaha 175 TRI-MOTO, 26MM Mikuni
    Honda US90 ATC, Collecting Dust
    2004 TRX450R

  5. #5
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    where did u get a new axle?
    85 250SX New to me!!
    85 ATC 70 stock ~ TRADED
    85 ATC 70 with 138cc Lifan
    83 110 restored ~ sold
    85 110 restored ~ sold
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  6. #6
    roger86200x is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    off ebay lol.......well not actually off ebay...i bought some other stuff off ebay and the guy said he'd throw in a new axle for $200 so I did it
    1984 Honda ATC 250r
    Bored .020 over Wiseco, Answer silencer, fresh motor, New connecting rod and balanced crank, Boyesen 2 stage power reeds

  7. #7
    bbechtel16 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    I'm running 87 on my 10.5:1 :shock: I know I shouldn't be but its free (from my grandpa's gas stockpile) and I haven't noticed any detonation. I guess I'm lucky.
    -'86 ATC 250SX: No longer mine... Complete 350X front end, Corbra Megaphone system, 350X carb with UNI dual stage foam & outerwear bolted driectly up, Powroll/Rocky 260cc bore 10.5 to 1 compression piston.

  8. #8
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    Should be allright with 87 on dirt roads or gravel. but if you were to ride in sand you would deff need the 93. Just becuse the sand puts more of a load on your motor.
    1985 atc 350x

  9. #9
    roger86200x is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    i ride trails but really, really fast lol
    1984 Honda ATC 250r
    Bored .020 over Wiseco, Answer silencer, fresh motor, New connecting rod and balanced crank, Boyesen 2 stage power reeds

  10. #10
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    hey did your piston and exhaust make a big diff over stock? I also have a 86 200x.
    1985 atc 350x

  11. #11
    roger86200x is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    piston.WAY more power!@ and exhaust too..sounds FREAKIN AWESOME! more acceleration too
    1984 Honda ATC 250r
    Bored .020 over Wiseco, Answer silencer, fresh motor, New connecting rod and balanced crank, Boyesen 2 stage power reeds

  12. #12
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    I paid $300.00 for it but i need to staightn the forks and new rear plastic and front fender. Other than that it's in great shape.
    1985 atc 350x

  13. #13
    roger86200x is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    if u look at mine trailprotrailpro I restored it, I paid $435 as it was and it ran good....
    1984 Honda ATC 250r
    Bored .020 over Wiseco, Answer silencer, fresh motor, New connecting rod and balanced crank, Boyesen 2 stage power reeds

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