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my350yfm
Blaster class
Joined: 01 Nov 2007
Posts: 143
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 Posted: Sun Aug 10, 2008 3:56 pm Post subject: honda trx 400ex 2003 performance rebuild |
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hey all was thinking about putting a bigger piston in my bike, something to bore it to a 440cc. what does anybody rekon, i was wondering if anybody has done something like this to a trx, if so could you tell me what the best parts are to use and general info etc,etc, keeping in mind i still want it to be reliable if possible, with more power, any info would be great.thanks
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08 can-am ds450x
03honda trx400ex |
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Sponsor
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REDTED
Roostin Away
Joined: 15 Jun 2006
Posts: 627
Location: Orange N.S.W
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tapped out
90cc 2 stroke / 110 4 stroke
Joined: 25 Aug 2006
Posts: 52
Location: Broken Hill
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| Posted: Sun Aug 10, 2008 9:33 pm Post subject: |
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| DO NOT, I repeat DO NOT take your 400 out to 89mm. Reliability goes straight out the window. 416cc is ok though, get a revbox to lift the rpm limit and possibly a FCR carb and your in business. Oh yeah send it to serco in Brisbane they do wiseco. Cheers mate |
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my350yfm
Blaster class
Joined: 01 Nov 2007
Posts: 143
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| Posted: Mon Aug 11, 2008 5:58 pm Post subject: |
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do you know where i could buy the parts for this, would i need to get it re sleeved? i live in WA i have a good mechanic around the my area so he can do all the fitment, will this be a noticable gain in power??
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08 can-am ds450x
03honda trx400ex |
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priesty
Roostin Away
Joined: 28 Nov 2006
Posts: 645
Location: melbourne
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| Posted: Mon Aug 11, 2008 7:44 pm Post subject: |
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| Quote: | | 416cc is ok though |
How many mm oversize is 416cc ?, and do the 11:1 pistons require stronger head studs?
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The term "Foolproof" seriously underestimates the ingenuity of Fools.
08 700xx |
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tapped out
90cc 2 stroke / 110 4 stroke
Joined: 25 Aug 2006
Posts: 52
Location: Broken Hill
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| Posted: Mon Aug 11, 2008 10:44 pm Post subject: |
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| 85mm is standard, I think 86 is 416cc, 87 is 426cc (no sleeving required). 89mm needs bigger sleeve, everything gets hotter, oil needs to be changed more often. 11:1 is ok, I had head studs strip on left side and have head gaskets blow twice since. Local shop has had a destroyed xr400 come in so i'm gonna grab the cylinder and go back a few mm. |
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