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View Full Version : started 416 build what do you think so far


redrock_tj
10-22-2009, 01:29 PM
New to this site and checked through some of the posts on here and here is what I have going on so far... 05 400EX

Rings were bad, was smoking while on the throttle..
tore it down.. ordered 87mm 10.8:1 JE piston to bump up compression a bit. as soon as piston arrives jug will be bored from 85mm to fit the new 87mm piston then honed out..already have the over sized connetic gasket set... any thing I am missing guys? anything I should change while I have this thing torn down?
matt14c
10-22-2009, 02:54 PM
Put in new valve seals. Up to you if you want to put a new timing chain and tensioner in. With an 05 depending on the hours on the bike it should have a couple more years left in it. Get a valve lapping tool and relap the valves.
redrock_tj
10-22-2009, 04:10 PM
sweet new valve seals it will be,,, will I have to rejet for the compression? thanks for the input
400ex28
10-22-2009, 04:27 PM
I would throw in a hotcam stage 2 while i was in there and a 02 crf450 timing chain.
redrock_tj
10-22-2009, 06:39 PM
that is funny man what is the diff between the 02 crf450 cam chain and the stocker other than the stock cam chain is $105
and the 02 crf450 chain is only $41 lol.... is the 02 chain stronger or what?
400ex28
10-22-2009, 06:43 PM
It's stronger and a lot cheaper, fits perfect also.
redrock_tj
10-22-2009, 06:48 PM
cool thanks for the input
rocky_mtn_honda
10-22-2009, 07:23 PM
the stock crf450 chain is only like $35 from servicehonda.com...just got one myself, stronger, and has an extra link widthwise
redrock_tj
10-22-2009, 08:20 PM
aight i'll be going with the new chain upgrade as well..
then it'll be time to save up for the 450R carb, and twist throttle conversion... thanks for all the input guys big help!
rocky_mtn_honda
10-22-2009, 08:23 PM
did your gasket kit come with valve seals? probably some good insurance if it was smoking a little. i happen to have a set of 4 new ones if your interested