Does anyone run a spacer plate and 86 piston? Did you feel a performance change? I'm debating on if I should do this to my 1989 cylinder.
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Senior Member
Does anyone run a spacer plate and 86 piston? Did you feel a performance change? I'm debating on if I should do this to my 1989 cylinder.
Registered User
I do, they say it creates more crank case volume and more air/fuel and the power is smother. I do know one thing for sure the cylinder is harder to get in a atc frame with the spacer plate. When I redid my motor I used a 88/89 rod, had a cylinder ported, new reeds, tuned my 38 a's better, so just the spacer plate, I couldn't tell you. Also got a esr atc-5 pipe, verses a fmf and a the stock head was cut.
85/86 atc 250r, very modded, lrd 310pv, +1 lsr, shortrack kit, cr250r igntion, 39 pwk, paul turner hi-rev pipe, propeg nerf bars, HREATV custom frame,
86 atc200x- 84 250r exteneded axle, supertrapp pipe, 27mm carb, works rear shock, 84 250r front end(rebuilt w/ terry kit), 350x tripples, ported head, 12:1 piston, webcam,
crf450r quad, lsr frame, swinger, antifade, hyper beadlocks and the best of everything else.
88 trx 250r pced and reinforced frame, +3+0 t-pin, 310pv, cr ignition, 39 pwk, lsr rear end, elka shocks, aftermarket radiator, lrd pipe
06 ktm450exc, full skid plate/guards, radiator fan, clarke tank, dual sport kit, reg/ins/insp, steering stabilzer
98 200exc: street plated, skid/guards, dual sport lights, stabilizer and more.
07 ktm 250xc, skids, reg/ins, dampener, good lights
2011 atc450r in the works, suspension and details need to be worked out
Senior Member
Anyone else with a 87-89 use the spacer plate?
Member
Having my motor redone now with 89 crank and 86 piston so I will use a spacer plate. I will let you know in about a month when I get my bike done. I have a question about the head stay with a spacer plate, do you guys still run it? If so will I have to elongate the hole to bolt up to the head? If not running it will it vibrate much more?
Sean
Registered User
As I remember it fit on my atc with the spacer plate, when before I got a cr igniotion and had to use one of the holes to mount the coil. I never had a spacer plate on my trx250r, its only 5mm, don't see why it wouldn't
85/86 atc 250r, very modded, lrd 310pv, +1 lsr, shortrack kit, cr250r igntion, 39 pwk, paul turner hi-rev pipe, propeg nerf bars, HREATV custom frame,
86 atc200x- 84 250r exteneded axle, supertrapp pipe, 27mm carb, works rear shock, 84 250r front end(rebuilt w/ terry kit), 350x tripples, ported head, 12:1 piston, webcam,
crf450r quad, lsr frame, swinger, antifade, hyper beadlocks and the best of everything else.
88 trx 250r pced and reinforced frame, +3+0 t-pin, 310pv, cr ignition, 39 pwk, lsr rear end, elka shocks, aftermarket radiator, lrd pipe
06 ktm450exc, full skid plate/guards, radiator fan, clarke tank, dual sport kit, reg/ins/insp, steering stabilzer
98 200exc: street plated, skid/guards, dual sport lights, stabilizer and more.
07 ktm 250xc, skids, reg/ins, dampener, good lights
2011 atc450r in the works, suspension and details need to be worked out
Senior Member
Sean, I'm having my engine rebuilt in about a month. Let me know if you think the spacer plate is worth it as soon as you get your motor back. Good question about the head stay...I think elongating the hole is about your only bet.
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