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Old March 11th, 2008, 11:42 PM   #1
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Default reliability of built engine ?

im looking at a 460 stroker engine for my 400EX on ebay .. i emailed the guy asking about longeity he says it'll be fine will last a long long time blah blah but anyone will say what you WANT to hear to make a buck..
here's the listing
http://cgi.ebay.com/ebaymotors/HONDA...spagenameZWDVW

Would this engine last ?
I mainly do trail riding and dunes once every other month or so..

Ps im looking at it because my current engine is locked up and the crank bearings a shit..
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Old March 12th, 2008, 01:13 PM   #2
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I dunno - sounds too good to be true. Says TC racing did the rebuild, you could call them and ask how that engine would enjoy your stock carb and exhaust.

I think it is the beginning of a big headache for you.
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Old March 12th, 2008, 01:34 PM   #3
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Old March 12th, 2008, 05:32 PM   #4
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kinda what i was expecting to hear.. guess ill keep my eyes peeled for a stock engine..
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Old March 18th, 2008, 03:10 PM   #5
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I have used bigbore kits on several bikes..2 & 4 strokes, street and dirt. the only problem I ever had with any of them was heat, but it depended on the bike...but you could add an oil cooler to help with that....other than that no issues..you start have problems when you mess with cam timing and bumping up your compression
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Old March 19th, 2008, 06:44 AM   #6
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Originally Posted by Mike Hancho View Post
I have used bigbore kits on several bikes..2 & 4 strokes, street and dirt. the only problem I ever had with any of them was heat, but it depended on the bike...but you could add an oil cooler to help with that....other than that no issues..you start have problems when you mess with cam timing and bumping up your compression
Good point.

I have big bore kits on three bikes and I am able to use my stock carb on everything (though my wife's 150-turned-175 would definitely benefit from a 26mm carb )
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Old March 22nd, 2008, 04:06 PM   #7
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Originally Posted by ScOoTeR View Post
Good point.

I have big bore kits on three bikes and I am able to use my stock carb on everything (though my wife's 150-turned-175 would definitely benefit from a 26mm carb )

I used a 26mm carb on an 88cc honda, so yea I think you'd be safe bumping up!!
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Old April 7th, 2008, 04:51 PM   #8
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The old 440 big bores were enough to smoke the rod...460 is just begging for it to grenade
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Old May 20th, 2008, 04:04 PM   #9
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The old 440 big bores were enough to smoke the rod...460 is just begging for it to grenade
how many stroker big bores have you done or had?....yyyaaa shut up...
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Old May 27th, 2008, 02:45 PM   #10
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I had a 416 on my old ex. I really liked the way it performed on the track and trails.
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Old May 27th, 2008, 08:11 PM   #11
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like mike said heat is your issue i personally dont like bg bore kits in the 300 and 400ex's due to them being oil cooled. just doesnt seem as affective to me.if your gonna do it use good parts or you are just gonna waste your time. really if your not planing to put and exhaust and do carb work your not gona have that storker motor run to its full potential.IMO try and stay as close to stock far as bore goes and if you feel the need bump up the compression a little. whats wrong with your motor that you dont rebuild yours?
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Old May 27th, 2008, 08:12 PM   #12
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i didnt read the first post sorry put a nd crank kit in it and press new bearing in. instead of buying someone elses problems. that way you know what you do and dont have
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Old June 25th, 2008, 09:44 AM   #13
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Quote:
Originally Posted by Mike Hancho View Post
how many stroker big bores have you done or had?....yyyaaa shut up...
Sorry to resurrect but I just gotta add my .02

My friends and I have done so many its not even funny. Do your research. 400ex crank & rod can't handle the big displacement. Trust me on this.
For the record the old 440s had the squish calculated wrong, thats why many of them ran like ass. 400exs plain suck dick compared to the more modern 450s, even at 460ccs they just don't put out the power. Compound the fact that they are air cooled and you are just asking for disaster.

My new project is another 250R, +5 stroker and a big pro-x cylinder. I just got back from Saint Anthony sand dunes in Idaho and realized that my little stock R cylinder just wasn't cutting it. On my YFZ I was hitting the hills in 4th WFO and by the time I got to the top of the hill I has barely moving in 2nd pinned.....Thats the land of horsepower out there!!!
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Old March 28th, 2009, 11:36 PM   #14
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ok so bumping up an old thread.. need some fresh advice.. guy im working with does this stuff all day long so we tore the engine down and found my rod is seized right to the crank... So i talked with Trinity racing about this kit.. (2nd one)
http://www.trinityracing.com/prod_hon_trx400_kits.html

so he shot me a price with a stage 2 cam and i can get all the same stuff in their kit (hot rods crank, hot cams cam wiesco piston and bore, and a full gasket set)
Im looking doing the +4 mm offset crank with rod wiesco 12:1 piston with 440 sleeve stage 2 hot cam and a jet kit with stock carb and exh or should i just run a stock crank with a 426 piston and sleeve and stage 2 cam stock carb and exh. with a jet kit
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Old March 30th, 2009, 05:25 AM   #15
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just do it and when you blow it up again you can just spend more money and get a new one!
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Old March 30th, 2009, 08:08 AM   #16
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I say do it and then tell us how reliable it is!!
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Old April 2nd, 2009, 10:27 PM   #17
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I say do it and then tell us how reliable it is!!
i think im going to.. plus a slip on muffler and a bigger carb.. Fuck it ill just get a credit card and go all out..
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