New discovery....

[stalefish_132]

well last my head gasket blew on my EX and so i tore her down to get ready to get some new head studs put in, andi figured while i'm in theere i might as well re-ring my 7 year old 440. i was told when i bought it that it was stroked +4mm and bored to 87mm=440. and it had a wiseco piston in it. well today i took a tape measure to it and just looked and it show somwhere around 89mm. and i looked under the piston and it says JE 89mm. and i look close an its the stock rod aswell:eek2: but now what i'm wondering he said it was 10:1 compression and i'll post some pics and maybe somone can tell me what compressiopn ratio this piston looks like.


thanks,
Jordan

[stalefish_132]

#2...

[stalefish_132]

#3

[stalefish_132]

last...

[RiderTRX400ex]

looks like a prety high comp. piston.. maybe 12:1 ? really a guess tho.

[stalefish_132]

now after a close inspection, there are 2 hairline cracks in my intake side skert.
what piston should i replace it with? i've never had any experince with JE before (untell now) i've used wiseco's in mall my 2 stokes and i'm leaning towards a wiseco. what do you recomend?


also i got my hotcam a few weeks ago from xrs only and they sent me a stage 2 cam insted of stage 3. but now after looknig at the spec card that came in the box and looknbig on hot cams web site their stage 2 and the stage 2 that i have a differant.

mine...
part #:1008-2

Intake Exhaust
lift:8.85mm lift: 8.6mm
lobe center:106 lobe center :107
duration @1 mm:254 duration @1mm:254
valve lash : .13mm valve lash: .15mm

and from hotcams site...

Part no:1043-2

Intake Exhaust
Lift: 9.0mm Lift: 8.9mm
Lobe Center: 106 Lobe Center: 104.25
Duration@1mm: 254 Duration@1mm: 248.5
Valve Lash: .13mm Valve Lash: .15mm

does anyone konw what cam i have? :huh

pics of where the cracks are...

[GPracer2500]

You've got the "old" stage 2. They changed the grind of the stage 2 just a little.

http://www.exriders.com/vbb/showthread.php?s=&threadid=224516

[400exrules]

it would be smart to get a HD rod

[stalefish_132]

this winter i'm planing on doing a 465 stroker and replacing the stock rod. i'm really leaning towards a wiseco 89mm 11:1 piston now.that the skitrt has cracks in it i'd rather go with what i know more about.

thanks

[GPracer2500]

FWIW, Wiesco has nothing on JE. I actually like JE a little more. Don't let an old piston that cracked for reasons that may not be the piston's fault turn you off to a good manufacture.

my $0.02