Please help thin head gasket swap
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  1. #1
    Senior Member 1986_trx's Avatar
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    Feb 2018
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    Please help thin head gasket swap

    Ok so it's been a little bit since I've last posted but Im almost done building my 86 trx to race hare scrambles this year! Im a 20 year old Tig welder so time off is hard to come by! Right now I'm running a stock cylinder but it's bored over to a 67.50 mm, I had the cylinder decked, cool head, 20cc dome if I remember right, I put in a new weisco piston, boyesen rad valve, spacer, pj38 carb, Paul Turner 89 race pipe, pro circuit 304 and so on... Right now I'm running the OEM 3 piece head gasket. I run vp110 and 91 ethonal free at 50% each per gallon. With klotz r50 at 32/1. I'll do a compression test today but if I remember correctly it was around 190. Can I swap that head gasket out for a cometic .010 gasket and switch to straight 110 octane. Does a uccr need to be performed? Would a mod like this give me any noticible power increase? I mean it screams now but more is always better! I also don't like driving all over to find ethonna free fuel and 110 octane.

  2. #2
    Senior Member atvguy's Avatar
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    Jul 2014
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    Quote Originally Posted by 1986_trx View Post
    Ok so it's been a little bit since I've last posted but Im almost done building my 86 trx to race hare scrambles this year! Im a 20 year old Tig welder so time off is hard to come by! Right now I'm running a stock cylinder but it's bored over to a 67.50 mm, I had the cylinder decked, cool head, 20cc dome if I remember right, I put in a new weisco piston, boyesen rad valve, spacer, pj38 carb, Paul Turner 89 race pipe, pro circuit 304 and so on... Right now I'm running the OEM 3 piece head gasket. I run vp110 and 91 ethonal free at 50% each per gallon. With klotz r50 at 32/1. I'll do a compression test today but if I remember correctly it was around 190. Can I swap that head gasket out for a cometic .010 gasket and switch to straight 110 octane. Does a uccr need to be performed? Would a mod like this give me any noticible power increase? I mean it screams now but more is always better! I also don't like driving all over to find ethonna free fuel and 110 octane.

    Since u have coolhead I would say just change dome to a lower number for more compression
    RIDE WHATEVER IS NOT BROKEN!!

  3. #3
    Senior Member TrailBurner's Avatar
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    Jul 2013
    Location
    Rochester NH
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    929
    Quote Originally Posted by 1986_trx View Post
    Ok so it's been a little bit since I've last posted but Im almost done building my 86 trx to race hare scrambles this year! Im a 20 year old Tig welder so time off is hard to come by! Right now I'm running a stock cylinder but it's bored over to a 67.50 mm, I had the cylinder decked, cool head, 20cc dome if I remember right, I put in a new weisco piston, boyesen rad valve, spacer, pj38 carb, Paul Turner 89 race pipe, pro circuit 304 and so on... Right now I'm running the OEM 3 piece head gasket. I run vp110 and 91 ethonal free at 50% each per gallon. With klotz r50 at 32/1. I'll do a compression test today but if I remember correctly it was around 190. Can I swap that head gasket out for a cometic .010 gasket and switch to straight 110 octane. Does a uccr need to be performed? Would a mod like this give me any noticible power increase? I mean it screams now but more is always better! I also don't like driving all over to find ethonna free fuel and 110 octane.

    Get rid of the pj, run 40-1, remove spacer, change dome back to stock and have head work done. 12 degree angle, .050 squish, check plugs often, do plug chops
    86 253cc, 40pwk, CT OOF pipe.
    99 583 Formula Z
    74 340 TnT- in progress/restoration
    Owner, hellabrokeNH- coming soon.


 

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