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Return to: LTZ400 / LTZ250 / LT230 - Engine
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#Post#: 25542--------------------------------------------------
Not a ltz but advice wanted
By: Buckeye513 Date: August 29, 2013, 12:35 pm
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So my dads kfx needs a rebuild. Gonna go with a 440 big bore kit
cylinder works or Athena, there's a $130 price difference
between them. Also should I do anything to the head, cams or
valves? Want a reliable rebuild but get good power out of it.
Any suggestions of opinions are greatly appreciated. And I know
its a kawi but its pretty much the same bike as a ltz.
#Post#: 25557--------------------------------------------------
Re: Not a ltz but advice wanted
By: Rider414 Date: August 29, 2013, 3:05 pm
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I went through this with a YFZ450.
I had a cylinder works kit that lasted almost 4 seasons. The
cylinder cracked and leaked coolant into the motor.
I now have a Athena kit. It was highly recommended in the YFZ
community over the CW stuff.
2c 2c 2c 2c 2c 2c 2c 2c 2c
#Post#: 25558--------------------------------------------------
Re: Not a ltz but advice wanted
By: Rider414 Date: August 29, 2013, 3:07 pm
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I have a friend with a KFX400.
He is running the Hotcams and a Full Yosh pipe. It made a
substantial difference.
#Post#: 25559--------------------------------------------------
Re: Not a ltz but advice wanted
By: Gillio Date: August 29, 2013, 3:24 pm
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Head port and a serdi valve job matched to a cam with a nice
exhaust, add a dash of compression and serve hot. voila.
#Post#: 25563--------------------------------------------------
Re: Not a ltz but advice wanted
By: Dangerouspower Date: August 29, 2013, 4:06 pm
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[quote author=Gillio link=topic=2358.msg25559#msg25559
date=1377807899]
Head port and a serdi valve job matched to a cam with a nice
exhaust, add a dash of compression and serve hot. voila.
[/quote]
+1 old style hotcams are pretty nice, and I would recommend the
full Yoshi pipe.
But really you don't need to get it ported just get in that 12.
compression reange (13+ will require race fuel), some old style
hot cams (new style are fine just OSHC seem to be better), full
exhaust, and a 434 kit. I cant really give insight on which one
but Im pretty sure I see good results out of both of them!
Also don't be surprised if your threads are stripped on the cam
journal cap(s) its very common in these machines.
#Post#: 25566--------------------------------------------------
Re: Not a ltz but advice wanted
By: Buckeye513 Date: August 29, 2013, 5:30 pm
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My dads not a fan of cheap parts so he'll likely go with the
Athena kit. I'm pretty sure he already has a yosh exhaust.
Thanks for the input guys keep it coming gonna be my first 4
choke rebuild.
#Post#: 25573--------------------------------------------------
Re: Not a ltz but advice wanted
By: Gillio Date: August 29, 2013, 8:55 pm
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Valve and port profile are key in making 4 stroke performance.
If your looking for performance with reliability, Freshen up
your bore and spend some money in your head. Just my .02.
#Post#: 25578--------------------------------------------------
Re: Not a ltz but advice wanted
By: Buckeye513 Date: August 29, 2013, 9:30 pm
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Thanks Gillio ill let my dad know see how much money he's ready
to sink in this rebuild/beef up.
#Post#: 25918--------------------------------------------------
Re: Not a ltz but advice wanted
By: WestTexasKing Date: September 6, 2013, 4:27 am
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Posting pictures LOL
http://i2.kym-cdn.com/photos/images/original/000/603/056/065.png
#Post#: 25925--------------------------------------------------
Re: Not a ltz but advice wanted
By: Motorgeek Date: September 6, 2013, 8:44 am
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[quote author=Gillio link=topic=2358.msg25559#msg25559
date=1377807899]
Head port and a serdi valve job matched to a cam with a nice
exhaust, add a dash of compression and serve hot. voila.
[/quote]
Some of the worst valve jobs I have had to re-do were from Serdi
valve machines run by inexperienced/in a big hurry operators.
Shops buy a Serdi seat and guide machine, then advertise their
valve jobs on EBay. The operators must assume the Serdi
machines are idiot proof. They need to check their work after
they cut the seats!
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