ok so i have a race mechanic buildng my bike and i was told he was putting 13-1 comp piston.. its stock bore. what brand is this piston?
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When In Doubt Gas It Out!
ok so i have a race mechanic buildng my bike and i was told he was putting 13-1 comp piston.. its stock bore. what brand is this piston?
2005 450r orange, Hiper, Elka, Houser, Maier, Zing, Hmf, Precision, you get the point :Sold
2004 400ex yellow, lsr, fox, maxxis, Renthal, Douglas, Hmf :Sold
2005 f-150, black, v8 4.6, xlt, 18" king ranch wheels.
Buy My Truck
Registered User
Ask the builder.
The only 13:1 400EX shelf piston I know of is an 88mm (426cc) JE. [shrug]
"It ain't what you don't know that gets you into trouble.
It's what you know for sure that just ain't so. "
--Mark Twain
keepin it pinned
yeah good luck with that
2001\400ex\yellow\
Duncan pc4000\hd cam chain\
12:1 \je 440\450 carb
Renthal twin wall handlebars\cr250 clutch perch\holeshot xc tires on quad rok rims\
Black aluminum air scoops\aluminum air box no lid\k&n air filter\rev box\ \works triple w\rezzy \knew chain w\14t front 38t rear \over sized aluminum oil rezzy \stage 2 hot cam\
full dmc after burner exhaust\
1965 honda 65 sport that starts first kick.
Registered User
13 to 1 high comp stock bore piston. i think id go find a new mechanic. even if there is a 13 to 1 compression stock bore your gunna want to put hd jug studs and some vp race fule.
04 dodge cummins 6 speed
Houser crf hybrid
08 trx450r
When In Doubt Gas It Out!
yea right this guy races too. he has a stocker 450 (not stock at all) a 500r a 250r (flat track) a yfz 450 for playing with. this guy chrages nearly nothing and gurantees all. hes more of a friend to us. i no they have them i have seen them. they are just like 300 dollars and hes getting of a shop that sell parts for what they pay for them to him.Originally posted by 250x_kyle
13 to 1 high comp stock bore piston. i think id go find a new mechanic. even if there is a 13 to 1 compression stock bore your gunna want to put hd jug studs and some vp race fule.
2005 450r orange, Hiper, Elka, Houser, Maier, Zing, Hmf, Precision, you get the point :Sold
2004 400ex yellow, lsr, fox, maxxis, Renthal, Douglas, Hmf :Sold
2005 f-150, black, v8 4.6, xlt, 18" king ranch wheels.
Buy My Truck
426EX(WOODS WARRIOR)
Can you say expensive to run 13.1=race fuel ,HD studs.13.1 is a high compression ratio for an ex,i would go with an 11.1 with little to no mods not a 13.1 WOW....
(2003)426ex,edelbrock carb,maxis razors,dirt digger clutch,ported and polished,Kibblewhite valve springs and Black Diamond valves,Omf air scoops,Renthal all diamond grips hard compound,Whitebrothers E-series pipe,Hot cam stage 1,Hot Rods crank,Wiesco 11:1 piston,HD CRF timming chain,Pro Armor front bumper,Omf skid plates, K&N air fiter,Outerwears Prefilter,LA sleeve,Longhorn atv high bend big bars,AMR monster coil,08'450r heel guards & pegs,Streamline 7 way stabilizer,450r front shocks,Primary Drive gold 520 race chain,LSR 250r axle,ss front brake lines,07 sub frame, pretty much just engine work right now, top to bottom new.Would really like to convert my 03' plastics to 08' plastics.FOR SALE!!! PM ME FOR DETAILS.THANKS
Member
For a stock bore 13:1 is to much. You are going to have problems with blowing head gaskets and spend more in racing fuel. My 440ex has 12.5:1 compression and I have to run race fuel. Almost twice the cost of regular gas! I run 110VP and just paid $6.45 a gallon. Premium around my town is about $3.35. Just think is it going to be worth it or not!
2001 Honda 400ex
440 Kit
12.5:1 Piston
110 Octane Leaded (VP107)
Hot Cam Stage 2
Port and Polished
Pro-Circuit T-4 Full Exhaust
Heavy Duty Cam Chain
K&N Air Filter with pre-filter
Outwear Air Box Cover
Moderator
Why is 13:1 too much for the stock bore and how does the difference in bore size affect blowing head gaskets?
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