I see it is a big bore kit, what size piston would it be and compression. I would think it would be a big bore with a stroker.
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Senior Member
I see it is a big bore kit, what size piston would it be and compression. I would think it would be a big bore with a stroker.
2002 black and red 458ex
Engine:
Gt Thunder Big Bore (87mm)/(77mm) stroker 12.5:1 on 112 Leaded
Gt Thunder Full race port &polish
GT Thunder Cam
FCR 39mm Carb
HD Cam Chain
HD Head studs
FMF Exhaust with power bomb header
GT Thunder CDI
GT Thunder 8 disk clutch
Spal Fan
K&N with outerwears w/o lid
Sparks advance key
Suspension:
GT thunder +2 a-arms with Elite shocks
GT Thunder rear xc link
Tusk red nerfs
13,15,16 tooth front sproket
Pro design case saver
Air scoops
ITP XCR Tires
For sale: red plastics, Full Big gun exhaust, White brothers CDI
2000 450es
32"
Lots of other stuff
Registered User
I'm pretty sure that is a 440 with a +4 stroked crank but that should only be a 460.I dont know where the other cc's would come from unless it is a bigger stroked crank.The piston size would be an 89mm
Everyones Fav. Redneck
No there 465 does not use a stroker crank if i remember correctly. Anything bigger than that uses a stroker.
Give them a call and talk to them about it. But ya the 465 is just a larger bore. The 500 uses a stroked crank.
2002 426ex
white bros. r4 pipe, k&n filter w/outerwares and No lid, wiseco 11:1 426 , kibble white valves, stage 2 cam , 450r carb , +3 timing key , Lonestar +1 1/4 chromed swingarm, g-force +4 axle, Houser silcast +2 ST arms, 450r shocks with works zps triple rate springs , Hiper tech 3 beadlocks (with orange rings soon to be black), maier silver racecut plastic with a QT CF hood
(work in progress)(NOW PARTING OUT)
03 CRF450r
(totaled and parting out)
Now the new toy
84 Chevy shortbed K10
7in lift (4 suspension and 3 body)
35in tires
350 4spd
(another work in progress)
Everyones Fav. Redneck
Look the 500 is the only one that lists using a stroker crank
Go under engine part- Honda -400ex
http://www.fourstroketech.net/
2002 426ex
white bros. r4 pipe, k&n filter w/outerwares and No lid, wiseco 11:1 426 , kibble white valves, stage 2 cam , 450r carb , +3 timing key , Lonestar +1 1/4 chromed swingarm, g-force +4 axle, Houser silcast +2 ST arms, 450r shocks with works zps triple rate springs , Hiper tech 3 beadlocks (with orange rings soon to be black), maier silver racecut plastic with a QT CF hood
(work in progress)(NOW PARTING OUT)
03 CRF450r
(totaled and parting out)
Now the new toy
84 Chevy shortbed K10
7in lift (4 suspension and 3 body)
35in tires
350 4spd
(another work in progress)
Senior Member
Id be concerned about the heat and how thin it would make the sleeve. Maybe the compression isnt to high? The piston would be a 92mm i think
2002 black and red 458ex
Engine:
Gt Thunder Big Bore (87mm)/(77mm) stroker 12.5:1 on 112 Leaded
Gt Thunder Full race port &polish
GT Thunder Cam
FCR 39mm Carb
HD Cam Chain
HD Head studs
FMF Exhaust with power bomb header
GT Thunder CDI
GT Thunder 8 disk clutch
Spal Fan
K&N with outerwears w/o lid
Sparks advance key
Suspension:
GT thunder +2 a-arms with Elite shocks
GT Thunder rear xc link
Tusk red nerfs
13,15,16 tooth front sproket
Pro design case saver
Air scoops
ITP XCR Tires
For sale: red plastics, Full Big gun exhaust, White brothers CDI
2000 450es
32"
Lots of other stuff
Registered User
Some company's...an maybe FST would use the stock length crank, split the cases an put a much larger sleeve in. So the stroke was stock, but a much bigger piston....if I remember right, the FST 500 had the same thing done with the cases an cylinder, but with a stroker crank...it could start out at 480 an be bored up to 510 cc I believe...I think that took a 95mm piston. Chad Duvall ran the 500cc in GNCC Pro's an was very good with it, even when the YFZ's came out. FST told me it ran reliable all season long...I almost did this to mine, but it is kinda costly....I went with the KTM 520EXC motor in my 400EX instead...its actually has a 95mm piston an same stroke as the FST500.....making it actually 510cc....which is what the KTM motor displacement really is.
1984 Honda 200M ATC
1985 Honda 200X ATC
1986 Honda 200X ATC
1999 Honda 406EX....11:1, Web Cam / Hardened rockers. Ported. WB CDI. CT Racing header. WB E-Series slip on. Lonestar swinger.
2001 Honda/KTM 520 Hybrid Quad. Its like a 400EX but twice the horsepower.
2014 Artic Cat Wildcat Trail XT
Everyones Fav. Redneck
Ya it requires a larger sleeve.
I know the They ran a few in GNCC and they were said to be reliable but i never ran one.
I was thinking about building one also but just figured it wasnt practical. So i went 426 instead haha
2002 426ex
white bros. r4 pipe, k&n filter w/outerwares and No lid, wiseco 11:1 426 , kibble white valves, stage 2 cam , 450r carb , +3 timing key , Lonestar +1 1/4 chromed swingarm, g-force +4 axle, Houser silcast +2 ST arms, 450r shocks with works zps triple rate springs , Hiper tech 3 beadlocks (with orange rings soon to be black), maier silver racecut plastic with a QT CF hood
(work in progress)(NOW PARTING OUT)
03 CRF450r
(totaled and parting out)
Now the new toy
84 Chevy shortbed K10
7in lift (4 suspension and 3 body)
35in tires
350 4spd
(another work in progress)
Registered User
Not sure if Powroll offers the +7MM crank anymore, but most stroker motors are +4MM. +7 or larger custom crank would require trenching the case to accomodate the roll out of the crank. A larger sleeve would be rediculously close to the studs. Already with a 89MM sleeve you are into the threaded portion of the studs which is where the heat builds up causing the studs to pull. I've always been curious to see what the difference in the PC4000 cylinder (Duncan) is. There are people on here with 495/500 builds so curious to see the heat/reliability of them.
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