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JStricker

I need a Honda 400ex engine

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I'm in need of a replacement engine for my '04 400ex. Can anyone help or at least give me some direction.

Thanks

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Welcome to QUACRAZY! You might want to check with these guys:

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Got $5k laying around???????????

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i dont sappose you still need a motor do u?

I need one for my 2003 I would gladly pay $500 or so as long as it runs ok

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I have been looking for a 400ex engine or a mid 80s yz250 engine and finding killer deals but nothing in my try-state near IN ther is a 400ex on ebay right now it's stock and used for $300 but it would b nice to b able to deal face to face if I could without driving over 300 miles

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What state are you located in and why 400ex or 250 since there such different motors? Do you have anything to trade or you looking at straight cash payment

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I live in Indianapolis looking to bye with cash and my quad is a 2003 400ex I would like to put the right engine on it but I put in the part about the mid 80s 1983 - 1985 250 yz 250 or 1998 cr 250 because I have a few top-ends that have been ported for alcohol and used on a micro-sprint I used to race I would need a good bottom-end because the clutch was cut off and flywheel was welded and the kick start removed for use in the micro-sprint I was thinking of maybe building a 250 2 stroke and retrofitting it on there Its close in power to weight ratio and I thank it might fit I have over 10 years of part fabrication

getting the exhaust pipe to fit right might b tricky but engine mounts are easy

Edited by Jonah27j

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I need a motor for a 07 400ex bought from a guy that ran with no oil and fried the motor I have 50 dollars invested and took to the shop and was gonna be over 3000 to rebuild so not wanting to do that if anybody has one they would like to get rid of I'm in desperate need of it

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    • By 400ex
      So after my 400ex pep up (High comp piston, stage 2 hot cam, and some others), There was a malfunction with the rocker arm jam-nut; guess it wasn't torqued to spec. The rocker arm nut caused the lash to become too out of clearance and I bent a valve on a test rip high in the rpm range. There was no damage to the piston but only that valve, a couple dents in the head, and a completely destroyed valve guide. So I decided to take it upon myself (after watching kenoconnors race porting instructions and reading up on this subject) to port my cylinder head significantly. I had the head decked, cylinder honed and smoothed/polished the dome/exhaust port (intake wasn't polished but dimpled slightly to ensure fuel atomization). So after porting, decking the head, I had all valves and guides replaced/reamed, 5 angle valve job, and recut seats, then I installed xr400 gaskets (for higher compression), carb jets; 42 pilot, 175 or 6 main not sure, dynojet needle, k and n filter with no lid, enlarging of header ports and big gun eco slip on exhaust for a 450r, trx 250r coil (adds 1000+ rpm to limiter), 11:1 85mm piston, stg 2 hc with springs and retainers replaced, and polished rocker arms. I then replaced both sprockets one down in front and stock in rear, o ring chain, and 18in tires. There is a larger list of mods but these were the only ones affecting acceleration/performance. On the dyno, this quad put down 42rwhp and was estimated at 46 to the flywheel. Once again this was 42 to the wheel on the stock bore/carb size/header. All this was done at 16 yrs old. You may not be able to see it in the picture but peak whp was 42 on a mustang dyno.


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