I am going to get a piston in a few weeks just .80 bigger no big bore or anything so what all will have to be done just install it and then break it in or what like machine work and other sutff please help
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Senior Member
I am going to get a piston in a few weeks just .80 bigger no big bore or anything so what all will have to be done just install it and then break it in or what like machine work and other sutff please help
Wiseco 11:1 bored .080 Piston, TC rev box, FMF Performax full Exhuast System, K&N air filter, Outerwears Prefilter, Custom air box lid, 400ex carb, DG jets, Removed choke Plate, Cometic Gaskets, Custom oil cooler, Sidewinder gearing 14-37,
LoneStar Billet Bearing Carrier, RK racing chain, Pure Sport Realtor on douglas .190, Titan Fast Trekker front tires, Shockwears shock covers, Ceet Graphics kit, Dg grab bar
Top Dog
I'm not sure where you got .80 over? but... look at you cylinder if its in decent condition, you can just get it honed, you can do it yourself with a special tool, or pay like under 20$ bucks to have someone else do it. You can hone a bore 3 times usually.
Or if you cylinjder is in bad condition or has more than 3 hones you have to get it bored, and step up to a slightly larger piston.
How many times over is your piston now? .60?
getting it bored is like 35$ I think.
440, Ross 11.5:1 piston, Web cam 479 grind, race port & polish, oversized valves, hardened rockers, CRF450 cam chain, 39mm FCR carb, lightened Flywheel, Stock clutch, WB CDI box, K&N filter , WhiteBrothers E-Series full exhaust, Sidewinder Chain, 15/36 gearing, open airbox, LSR Axcaliber +3.5 axle, Houser Racing +2 a-arms, Elka triple rate, fully adjustable front shocks, +1.25 Houser swingarm, Tag Metals X5 bars, Arens +1 steering stem, Muscle steering dampener, Stainless Steel brakelines, HeatSeeker temp. guage, Pro Design kill switch, DG Pro Series nerfs, 8 run Hauler paddles. ~~http://www.sounddomain.com/id/trick440ex~~
Senior Member
It is stock and i want a larger one without having to resleeve it so i am going to get a 76mm/.80 stock is a 74mm/stnd
Wiseco 11:1 bored .080 Piston, TC rev box, FMF Performax full Exhuast System, K&N air filter, Outerwears Prefilter, Custom air box lid, 400ex carb, DG jets, Removed choke Plate, Cometic Gaskets, Custom oil cooler, Sidewinder gearing 14-37,
LoneStar Billet Bearing Carrier, RK racing chain, Pure Sport Realtor on douglas .190, Titan Fast Trekker front tires, Shockwears shock covers, Ceet Graphics kit, Dg grab bar
Top Dog
well by doing that you'll probably pick up 1 hp, and you will be closer to needing a re-sleeve . that would suck if something went wrong and hurt your cylinder wall and you had no bore left.
Probably the best idea would be to go just .20 over and get a higher compression piston. You'll get more power that way.
440, Ross 11.5:1 piston, Web cam 479 grind, race port & polish, oversized valves, hardened rockers, CRF450 cam chain, 39mm FCR carb, lightened Flywheel, Stock clutch, WB CDI box, K&N filter , WhiteBrothers E-Series full exhaust, Sidewinder Chain, 15/36 gearing, open airbox, LSR Axcaliber +3.5 axle, Houser Racing +2 a-arms, Elka triple rate, fully adjustable front shocks, +1.25 Houser swingarm, Tag Metals X5 bars, Arens +1 steering stem, Muscle steering dampener, Stainless Steel brakelines, HeatSeeker temp. guage, Pro Design kill switch, DG Pro Series nerfs, 8 run Hauler paddles. ~~http://www.sounddomain.com/id/trick440ex~~
Senior Member
well i was thinking about .80 over with a compression of 11:1 what about going .60 over
Wiseco 11:1 bored .080 Piston, TC rev box, FMF Performax full Exhuast System, K&N air filter, Outerwears Prefilter, Custom air box lid, 400ex carb, DG jets, Removed choke Plate, Cometic Gaskets, Custom oil cooler, Sidewinder gearing 14-37,
LoneStar Billet Bearing Carrier, RK racing chain, Pure Sport Realtor on douglas .190, Titan Fast Trekker front tires, Shockwears shock covers, Ceet Graphics kit, Dg grab bar
dont go crazy with the bore,.20 or.40 is plenty.if you blow it down the road you will have a few bores left.if you go .80 now and blow it you will HAVE to resleeve it.the thinner your sleeve gets the more heat you will produce,an oil cooler is not mandatory but would be highly recommended when you start punchin out the 300.also,11.1 with the dome is the piston you want,later...
Senior Member
So how manny cc's will i pick up and how much faster do you think it will go mine now goes bout 61 62 cuz i was up against a sportsman 500 h.o. and i beat him and he said he was doing bout 60 62 so says his speedo but i dont know how accurate that is but mine aint stock i have a stage2 jet kit no airbox lid fmf full exhuast 14 36 gearing so i dont know if that sppedo is true but it seemed that fast:devil
Wiseco 11:1 bored .080 Piston, TC rev box, FMF Performax full Exhuast System, K&N air filter, Outerwears Prefilter, Custom air box lid, 400ex carb, DG jets, Removed choke Plate, Cometic Gaskets, Custom oil cooler, Sidewinder gearing 14-37,
LoneStar Billet Bearing Carrier, RK racing chain, Pure Sport Realtor on douglas .190, Titan Fast Trekker front tires, Shockwears shock covers, Ceet Graphics kit, Dg grab bar
Senior Member
hey you just need to go .020 oversize on the piston. just like everyone says, if it blows you can just bore the next size up. I would go with a 10:1 piston, you don't have to run 108 octan then just 93. The stock 300 is 8.9:1 I think. the 10:1 should give up a good power boost. That's what I'm planning to do to my 300.
2000 400ex
1996 300ex
2004 TRX 450R
2000 Red Dodge Ram sport
Dont ride on reserve tank
dude, jsut go .60 right now with 10 8:1 compression.. that way u can run pump gas(92, 93 octane safely).. 11:1 is pushing it
Max
2000 400EX
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